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Purpose of the DMPU electronic module
The DMPU type electronic module is used in ARDO washing machines and is designed to control the following units washing machine:
- collector motor alternating current;
- cold water inlet valve;
- drain pump;
- engine programmer (timer).
The DMPU module receives signals from the following units of washing machines:
- from the contact groups of the programmer (1, 3, 5);
- from buttons and handles of additional functions;
- from thermistor and temperature controller;
- from the water level switch in the tank;
- from the drum speed tachometer.
One of the important DMPU modules is monitoring the health of machine components (thermistor, main engine, drain pump, timer, temperature and speed controllers, additional function buttons) and the electronic module itself using the built-in autotest program.
Application and labeling of the DMPU module
The DMPU module is used in washing ARDO machines, produced since May 2000 and has found its application in front-loading models - both with a dryer (WD series) and without it (A series), designed for 800 and 1000 centrifuge revolutions. A little earlier, the type of this module could be found on some models of the Ardo S1000X narrow frontal machine. The era of the use of these digital modules ends with the advent of a new family of electronic machines that have the letter "E" in their name. An example of such a family are the models AE800X, AED1000X, TL1OOOEX, etc.
The electronic modules of these washing machines use the HC08 microcontroller family, which has more features than its predecessor HC05.
The label on the module (Fig. 1) allows you to determine its modification and scope.
In the upper left corner of the label there is a trademark of the module manufacturer and the parameters of the supply voltage, and in the upper right corner - the module modification: H7 or H8.1.
The central part of the label shows:
- DMPU - module type (for commutator motors);
- 10 or 1000 RPM - maximum drum rotation speed (in both cases 1000 rpm);
- /33, /39, /42 - additional information on washing machines, which use modules (33 - narrow models A833, A1033; 39 - model S1000X; 42 - full-size with front loading.
The lower part of the label shows the date of manufacture (for example, 06/21/2000) and the part number for the order (546033501 or 54618901 - see fig. 1).
Pin assignment of module connectors
Appearance an electronic module without a triac cooling radiator for the drum drive motor is shown in fig. 2.
Rice. 2 Appearance DMPU
The DMPU module is included in the general circuit of the washing machine using three connectors: CNA, CNB, CNC. Here is the pin assignment of these module connectors.
CNA connector:
A01- signal input from a temperature probe (thermistor) about water heating;
A02- common wire;
A0Z- signal input from the tachogener about the speed of rotation of the drum;
A04- common wire;
A05, A07- power supply of the stator winding of the drive motor;
A06- not used;
A08, A09- power supply of the rotor winding of the drive motor;
A10, A11- motor thermal protection circuit.
CNB connector:
B01- not used;
B02- button "extra rinse" (EC);
B03- button "stop with water in the tank" (RSS);
B04- button "switching off the centrifuge" (SDE);
B05- button "economy mode" (E);
B07- signal for adjusting the spin speed;
B08- signal for adjusting the temperature of the heating water;
B09- power supply for all front panel buttons;
AT 10- common wire;
AT 11- common wire;
AT 12- outlet to the cold water valve.
CNC connector:
C01- power supply of the module with alternating voltage -220 V, phase (F);
CO2- output to the drain pump (DPM);
POPs- power supply of the timer motor (TM);
C04- module power supply -220 V, neutral (N);
C05- signal input from the water level sensor;
C06- common information bus of timer switches;
C07- input from the timer's CT contact;
C08- input from the contact 1T of the timer;
C09- input from the 5T contact of the timer;
C10- input from the 3V contact of the timer;
C11- input from the 5V contact of the timer;
C12- input from contact 1V of the timer.
Functional diagram of the CM
Ardo based DMPU module
The functional diagram of the ARDO washing machine based on the DMPU electronic module is shown in fig. 3.
Rice. 3 Functional diagram of the ARDO washing machine based on the DMPU electronic module
It consists of the following elements:
- microcontroller of the HC05 family;
- power module;
- command generation module;
- adjustable command module;
- temperature module;
- tachogenerator module;
- upper water level control module;
- engine control module;
- control modules for filling valve, drain pump, timer motor;
- protection module.
Let us consider in more detail the purpose and functioning of the elements of the microcontroller.
Microcontroller of the HC05 family
We will describe the microcontroller using the MC68NS705R6ACP microcircuit as an example. The microcontroller receives information about the state of the washing machine units through the input ports and, in accordance with the program embedded in it, issues control signals to the output ports of the microcircuit.
Rice. 4 Structural diagram of the microcontroller MS68NS705R6ACP
The microcontroller consists of the following blocks (see Fig. 4):
- 8-bit processor;
- internal memory, including RAM (176 bytes) and one-time programmable ROM (4.5 kb);
- parallel and serial I/O ports;
- clock generator;
- timer;
- analog-to-digital converter.
The external signals RESET (pin 1 U1 in Fig. 3) and IRQ (pin 2 U1) are used to control the processor. When a signal arrives RESET = log. "0" resets all registers of the microcontroller to the initial state, and with the subsequent setting RESET = log. "1" the processor starts executing the program from the zero address of the ROM. If the start of the processor is due to power-up or signals from the internal function control unit, then the processor itself sets the value of the signal RESET = log on this pin. "0".
External interrupt requests are signals received at the IRQ input. The active level of the IRQ interrupt signal (high or low) is set during programming of the microcontroller.
Parallel I/O Ports
Four parallel ports can be used in the MC68NS705P6A microcontroller to exchange data with external devices: RA, RV, PC, PD (see Table 1).
Table 1 Composition and functions of the parallel ports of the microcontroller MC68NS705R6A
Bidirectional ports are used for input / output (I / 0) data, some ports provide only input (I) or only output (0) data - their functional purpose programmed in the microcontroller.
The pins of some ports (see Table 1) are combined with the inputs / outputs of other peripheral devices of the ADC (pin 15-19), timers (pin 24-25), SIOP serial port (pin 11-13). During the initial installation (when an external RESET signal is received), they are programmed for input / data and there is a log value on their outputs. "0", when the processor starts, these outputs are programmed in accordance with the program and can change their value to a log. "1", in which case they are used for data output.
In table. 2 shows the assignment of the I / O ports of the microcontroller in the DMPU module.
Table 2. Composition and functions of the input / output ports of the MC68NS705P6A chip in the DMPU module
Serial I/O Ports
For serial data exchange, the MC68NS705P6A microcontroller uses a simplified version of the SIOP synchronous serial port. To receive / transmit data, the port uses three pins of the RV port: SDO (pin 11), SDI (pin 12) and SCK (pin 13). Each bit is received and transmitted upon receipt of a positive edge of the SCK clock signal, which is formed when the water level switch is active. This means that the microcontroller uses the commands received on the pin. 11 and 12 only if there is water in the washing machine tank.
Internal clock generator (GTI)
The generator sets generates clock pulses to synchronize all blocks of the microcontroller. For its operation to vyv. 27 and 28 an external quartz resonator with a frequency of 4 MHz is connected. The frequency of the generated internal clock pulses F 1 = F 1 /2, where F 1 is the natural frequency of the resonator.
Timer block
Microcontrollers of the MC68NS705 family include a 16-bit timer that operates in capture and compare modes. The timer has the following external signals:
- TSAR capture input (pin 25), to which a signal is supplied from the tachogenerator of the drive motor;
- TSMP match output (pin 24), which is not used in the DMPU electronic module.
In the capture mode, the arrival of a signal at the input of the TCAP timer causes it to be written to the counter register. Subsequent writing to the register allows you to determine the time of arrival of the signal. This allows you to determine the speed of rotation of the rotor of the drive motor.
In compare mode, a specific number is written to the compare register. When the content of the counter becomes equal to the specified number, a match signal is generated at the TCPP output, depending on the situation, the value can take on the value of a log. "0" or log. "1".
Using a block timer in conjunction with an interrupt block allows you to measure the time intervals between events, generate signals with a specified delay, periodically execute the necessary subroutines, generate pulses of a given frequency and duration, and other procedures.
Analog to digital converter
The MC68NS705R6A microcontroller includes a 4-channel ADC: AD0-AD4 (vyv. 16-19). For the ADC to function, a reference voltage is required, it is formed by the temperature module - Vrefh and Vrl
In MC68NS705R6A, the reference voltage Vrefh is connected to the pin. PC7 (pin 15), and Vrl is connected to a common wire (pin 14).
The voltages Vin supplied to the AD0-AD3 inputs must be in the range Vrefh > Vin > Vrl). For the DMPU module, the input voltage value is as follows: 2.8 V > Vin > 0 V.
The microcontroller is powered by a voltage of 5 V and operates in an extended temperature range of -40...+85 °C.
Since the microcontroller is made using CMOS technology, it has low power consumption (20 mW in operation and 10 mW in standby mode) at a clock frequency F 1 = 2.1 MHz.
The input signals to the microcontroller of the DMPU module from the elements of the washing machine are in the form of pulse, potential (TTL levels) and analog signals. The output signals have a logical or pulse form. The pulse output signals of the microcontroller are used to control nodes on triacs, and the logical ones are used to control transistor switches.
Type of chips used in DMPU modules: MS68NS705R6SR or SC527896CP.
Power module
The power supply module (MP) is designed to convert AC voltage 220 V into constant stabilized voltages of 24 and 5 V. Voltage 24 V is used to power the executive relays K1 and K2 of the engine control module, and voltage 5V is used to power the microcontroller and other circuit elements. The MP is built according to a transformerless circuit, which includes quenching resistors R51A, R51B, a rectifier on elements D16, C20 and voltage stabilizers DZ4 (24 V) and U3 (5 V).
Command generation module
This module (Fig. 3) is designed to receive commands from the units that set the operating mode of the washing machine (timer, buttons for additional functions), convert them and transfer them to the corresponding inputs of the U1 microcontroller.
The module consists of six cascades of the same type, made according to the scheme of diode switches. Each stage has two inputs and one output. One of the inputs receives a command signal from the timer, the other receives a signal from the corresponding additional functions button. The following signals are generated at the outputs of the cascades:
- The 1st stage (diodes D7-D8) generates the SDD signal, which is fed to the serial port of the SIOP synchronous interface;
- The 2nd stage (diodes D15-D23) generates the SDI signal, which is fed to the serial port of the SIOP synchronous interface;
- 3rd-5th stages (diodes D3-D4, D5-D6, D1-D2) generate signals at the inputs of the parallel port РСО-РС2;
- The 6th stage (diodes D9-D10) generates a parallel port signal PD5 at the input.
Based on the input signals, MK U1 generates signals at the outputs of the parallel port PA0-PA7 to control the elements and assemblies of the washing machine in accordance with the selected program.
Adjustable command module
The module (Fig. 3) is designed to convert the mechanical position of the temperature and spin speed controllers into the corresponding analog voltages. It includes matching circuits (resistor dividers) in the circuits for selecting the water heating temperature and centrifuge speed.
Speed or temperature controllers are switched sets of fixed resistors connected to the middle point of the speed (temperature) dividers, from which the output voltages are read.
Node Collaboration
In accordance with the position of the speed control knob and the code of the command received from the command generation module, an analog signal is supplied to the input AD2 (pin 18 U1) of the microcontroller. It is converted by the ADC into a digital code, on the basis of which the MK U1 generates the appropriate output signals to change the rotational speed of the centrifuge during the spin phase. In the wool washing mode, the command generation module issues a command in accordance with which the spin cycle occurs at a reduced speed. When you turn on the "no spin" mode, access to any spin speed is excluded.
In some models of washing machines, instead of the knob for smooth adjustment of the spin speed, the “Low / High Speed” button is installed (the designation in the diagrams is “MC”), which includes two spin modes. Based on these changes, the U1 microcontroller is programmed by the manufacturer for a specific configuration of the washing machine.
If there is AD1 at the input (pin 17 U1), the ADC converts it into a digital command code and compares it with the signal code at the input AD0 pin. 16).
Based on the comparison of codes, the set water temperature in the tank is maintained when performing the following operations:
- DELICATE WASH at temperatures up to 65 ° C;
- INTENSIVE WASH at temperatures above 65 ° C, followed by topping up with water (if the temperature exceeds 70 ° C).
The following feature is required for machines with a DMPU module. The module itself does not directly switch the power supply of the heating element - this is done by the command device. The module controls the operation of the heating element as follows: if it is necessary to heat the water in the tank, the microcontroller as part of the module switches the command device (by turning on its engine) to the position when the corresponding contact groups close the power supply circuit of the heating element. As soon as the water temperature reaches the selected value, the motor of the command device is turned on, the power supply circuit of the heating element is opened, and then the washing process is performed in accordance with the selected program.
Temperature module
The module, together with the thermistor TR installed in the tank cover of the washing machine, generates a voltage proportional to the water temperature, which is fed to the ADC input (AD0, pin 16 U1).
In addition, the module generates the reference voltage Vrefh (2.8 V), which is necessary for the operation of the ADC, and supplies it to the input U1 (pin 15).
Tachometer module
The module is designed to convert an alternating sinusoidal voltage with variable amplitude and frequency, coming from the output of the drive motor tachogenerator, into a sequence of rectangular pulses of a fixed amplitude. The module includes diode D18 and transistors Q4, Q5.
Node Collaboration
The tachometer is a low-power, brushless generator with a rotor (permanent magnet) attached to the rotor of the machine's drive motor. When the tachometer rotor rotates, a variable EMF is induced in the stator winding with a frequency and voltage proportional to its rotation speed. The signal from the tachometer is fed to connector A03 of the DMPU module and then to the input of the tachometer module, in which it is converted into a sequence of rectangular pulses of positive polarity with an amplitude of 5 V and a frequency proportional to the engine speed. The converted signal is then fed to the timer block of the microcontroller U1 in the form of a TCAP signal (pin 25 U1).
Working in the capture mode, the timer fixes the arrival time of each subsequent pulse of positive polarity in relation to the previous one, and the speed of rotation of the drive motor is determined from it. The shorter the pulse repetition time, the higher the rotation speed. Estimating the pulse repetition time and command codes at the input of the PB, PC and PD ports, the microcontroller, in accordance with the program recorded in the ROM, generates engine control signals that are fed from the outputs RA7-5 (pin 3-5 U1) to the input of the engine control module .
The output signal PA7 controls the speed of rotation of the engine, by changing the time of arrival of the triggering pulses of the triac. Output signals PA6, PA5, depending on the version of the engine control module, provide reverse movement and stop the engine in accordance with the operation being performed.
In the comparison mode, the timer works only during the spin operation: it compares the periods of receipt of the TCAP pulses from the tachometer module - the constancy of the periods indicates the uniform rotation of the drum and the balance of the laundry in the washing machine. If an imbalance is detected, the microcontroller returns the operation to the stage of laying out the linen - there can be up to six such attempts, after which the spin cycle occurs at a lower number of revolutions.
Upper water level module
The module is designed to generate positive polarity SCK pulses that provide reading of SDO and SDI signals at the input of the SIOP serial interface.
The module is made according to the scheme of a diode switch and a limiter on the elements D12, D22, R53, R21 and R24.
Node Collaboration
When the contacts P11-P13 of the water level switch are closed on the resistor R53 (1 MΩ), an alternating voltage drop occurs, as a result, an SCK signal is generated. Reading by the microcontroller of the SDO and SDI signals coming from stages 1 and 2 of the command generation module is possible only when a positive half-cycle of the SCK signal generated by the upper water level module arrives.
Engine control module
The module is designed to amplify and convert the output signals of the microcontroller and 1 to control the operation of the drive motor.
The module includes the following nodes (Fig. 3):
- control keys and relays K1, K2;
- triac control signal amplifier TR2;
- drive motor triac (TR2).
Depending on the modification of the DMPU module, there are several modifications of the circuits of the engine control modules. We will conditionally call them version A and version B. These changes are shown in Table. 3.
Table 3 DMPU module configuration options
| Modification of the DMPU module | Microcontroller type U1 | Versions of key stages | Engine control module version | Type of relays used | |
|---|---|---|---|---|---|
| Switching relay K2 | Switching relay K2 | ||||
| H7 | MC68HC705P6A | Version 1 | Version 2 | Version A | RP420024 |
| H8 | SC527896CP | Version 2 | Version 1 | Version A | RP420024 |
| H8 | SC527896CP | Version 1 | Version 2 | Version A | AJW7212 |
| H8.1 | MC68HC705P6A | Version 1 | Version 2 | Version B | AJS1312 |
The diagram of the engine control module version A is shown in fig. 3, and version B - in fig. 5.
Rice. 5
Consider the interaction of the engine control module with other devices using the example of version A used in the H7 DMPU modification (Fig. 3).
Relay control key K1 (version 2)
The control key of the relay K1 is made on the transistor Q3, the load of which is the winding of the relay K1. Diode D11 is connected in parallel with the relay winding, it protects transistor Q3 from breakdown. The key is powered by voltages of 24 and 5 V.
In the initial state, transistor Q3 is closed, relay K1 is de-energized and, with its contacts K1.1, connects the motor stator in series with the rotor and with the top output of the triac TR2 according to the circuit. When a signal arrives at the Q3 base, the log. "1" the transistor opens, relay K1 is activated and its contacts K1.1 and K1.2 break the power supply circuit of the drive motor.
Relay control key K2 (version 1)
The relay control key K2 is made on the transistor Q1 in a similar way, with the exception of the base bias circuit Q1. In the initial state, the key is closed and the relay contacts K2.1 and K2.2 include the rotor winding in the motor power circuit in such a way that the stator output (M5) is connected to the rotor output M9, and the other output of the rotor M8 through the contact group K2.2 and motor thermal protection (TM7-TM8) is connected to the mains phase (indicated by the letter "F").
With this inclusion of the rotor and stator, the rotation of the drive motor occurs clockwise. Upon receipt of the input key log. "1", it opens, the relay with its contacts K2.1 and K2.2 through the contacts of relay K1.2 changes the rotor switching circuit. The M5 stator is connected to the M8 rotor, and the M9 rotor is connected to the network phase through the contact group K2.2 and the motor thermal protection (TM7-TM8). Such an inclusion changes the direction of current flow in the rotor winding of the motor and the direction of its rotation (counterclockwise).
Diagrams of key cascades of versions 1 and 2 are shown in fig. 6 and 7. Both versions of the key are opened by log signals. "1" coming from the pin. 5 and 4 microcontroller U1.
Rice. 6 Version 1 key scheme
Rice. 7 Version 2 key scheme
The signal from the output. 5 (PA5) comes only to break the power circuit between the rotor and the stator of the motor. The signal from the output. 6 (RA6) provides the mode of reverse rotation of the drum in the mode of washing and laying out the linen.
Signal amplifier for TR2 triac control
The amplifier is designed to match the output PA7 of the microcontroller U1 (pin 3) with the control electrode of the triac TR2. The amplifier is made on the transistor Q2. A change in the triggering phase of the triac TR2 leads to a change in the supply voltage to the motor, which means that the speed of rotation of the motor rotor also changes. The maximum motor speed is programmed in the U1 microcontroller by the manufacturer. This is exactly what CMA models of the same type differ from (an example of the A800X and A1000X models whose serial numbers begin 200020ХХХХХ or 0020ХХХХХ).
Upgrade enthusiasts can easily increase the spin speed from 800 to 1000 by replacing their electronic module with a 1000 rpm “smart twin” module.
Engine control module (version B)
The module (Fig. 5) differs little from the version A module, except for a few points.
The main differences are in the switching of relays K1 and K2, the program of their work has been changed: if in version A, with the Keys K1 and K2 closed, the engine starts rotating when a signal arrives at the control electrode TK2, then in this version the engine power supply circuit is broken. Serial connection of the rotor and stator windings is possible only when one of the relays is on and the other is off. The reverse rotation of the motor rotor is provided by a change of states to the opposite.
Control modules for filling valve, drain pump, timer motor
The timer motor control module (TM) is designed to switch the timer motor by a signal from the output. 8 (PA2) of the microcontroller U1. The module is made on a TR4 triac connected in series with the load (timer motor) in the 220 V power circuit. The input signal amplitude is sufficient to open TR4, and from it the mains voltage is supplied to the timer motor, which starts its rotation and moves the timer cam mechanism to another position , thereby closing the other contacts of the contact groups 1, 3 and 5. Thus, the operation code is changed.
The control modules for the drain pump and filling valve are also built according to a similar scheme.
The drain pump control module (DPM) is made on the TR1 triac, controlled by pulses from the pin. 6 (PA4) U1.
Filler valve control modules (WV) is made on the TR5 triac, controlled by pulses from the pin. 7(TIME)U1.
DMPU protection
To protect the electronic module from high level mains voltage, it contains a VR5 varistor connected in parallel to contacts 01 and 04 of the CNC connector, through which the entire DMPU module is powered
Checking and repairing the DMPU module
Before proceeding with the repair of the DMPU module, it is necessary to have a complete picture of the malfunction. It is best to test the module on the washing machine by running the autotest program.
Autotest
The autotest program can be carried out on any model of the washing machine, where the modifications of the modules described above are used. You cannot test DMPUs on induction motor machine models, high speed models (above 1000 rpm), and Ardo S1000X models manufactured before December 1999.
Before starting the autotest, it is necessary to transfer the CM to the following state:
- set the programmer to position 30 until it clicks (the penultimate one before STOP on the “Cotton” program);
- the temperature control is set to position 0;
- press all buttons on the front panel of the SM;
- there must be no water in the tank;
- hatch must be closed.
To start the autotest, turn on the power to the CM - if there is no short circuit in the temperature probe and it is not disconnected, the drum rotates at a speed of 45 rpm, otherwise it stands still.
Turn the temperature control knob to the 40 ° C position - the drum rotates at a speed of 250 rpm, the drain pump turns on and voltage is applied to the timer motor. 2 minutes are allotted for further testing, after which the test stops.
If you want to skip the button test, turn the temperature control knob to position 0. During this part of the test, the maximum speed of the centrifuge is reached.
To test the buttons and circuits of additional functions, they must be pressed in accordance with the specified sequence, otherwise an error condition is created and the drive motor will not rotate.
When the half load button is pressed, the drum rotation speed changes from 250 to 400 rpm.
When the rinse buttons 3 or 4 are pressed, the drum speed changes from 400 to 500 rpm.
When the stop button is pressed with water in the tank, the drum rotation speed changes from 500 to 600 rpm.
When you press the economy wash button, the drum speed changes from 600 to 720 rpm.
When the high water level button is pressed, the drum rotation speed changes from 720 rpm to maximum.
If the tested washing machine does not have one of the listed buttons, to continue the test, press and immediately release the centrifuge off button.
The centrifuge stop button and the centrifuge speed control do not function properly until 3 seconds after the end of the sequence.
This autotest allows you to check the operation of all components of the washing machine, with the exception of the filling valve, heating element and level switch.
Program 1 is used to test the filling valve and level switch.
Testing the DMPU Module with Measuring Instruments
The DMPU module can be checked offline. To do this, it is necessary to assemble the circuit in accordance with Fig. 8.
Rice. 8 Offline DMPU Testing Scheme
Before testing a module, check:
PCB integrity;
The quality of soldering, especially powerful elements (triacs, resistors R51);
No damaged items.
Be sure to check the resistors R51 (two large ceramic) connected in parallel. The resistance of the resistors connected in parallel should be 3.1 kΩ. A common module defect is when one or both resistors are open.
In conclusion, without soldering the voltage regulator U3 (5 V), check the resistance between its terminals. If a short circuit is detected in at least one of the transitions, the stabilizer is replaced.
Testing the DMPU module without connecting to a washing machine
Let us explain the procedure for assembling the circuit for testing the DMPU module.
Connect to cont. A01-A02 resistor with a resistance of 5 kOhm, to A05-A07 - a 220 V / 60 W lamp. In addition, install jumpers between the cont. A08 and A09, A10 and A11. Then install one of the following jumpers on the CNC connector:
a) to check the general test;
b) to test the water inlet program;
c) to test the water drain program.
Supply voltage 220 V is supplied to the module through contacts C01 and C04.
The procedure for testing with jumper "a" is given in Table. 4.
Table 4. The result of the general test with different configurations of the control module (jumper "a")
| Relay type in DMPU module | Module Behavior When Tested |
|---|---|
| AJS312 | After the relay is triggered, the brightness of the lamp glows smoothly (within a few seconds), then it continuously glows at maximum brightness (within a few seconds) and turns off abruptly, after a few seconds the brightness of the lamp glow slowly increases. The procedure is repeated 4 times |
| AJW7212 | After three relay operations, the brightness of the lamp glows smoothly (within a few seconds), then it continuously glows with maximum brightness (within a few seconds) and goes out abruptly, after a few seconds the lamp slowly lights up. The procedure is repeated 4 times |
| RP420024 | After two relay operations, the brightness of the lamp glow gradually increases (within a few seconds). The test is then repeated 4 times. |
Depending on the firmware version of the microcontroller, the execution time of each test step and the pause between them can vary from 6 to 20 s. At the end of the test, a voltage of 220 V appears between the contacts C01 and COP of the CNC connector.
This test allows you to check the health of the microcontroller and, in part, the power supply, the engine control module, the command generation module, the engine speed control system and the timer control module.
This behavior of the module during the test is explained by the fact that it does not receive impulses from the tachometer and the system perceives this as a lack of rotor rotation. As a result, the controller smoothly increases the voltage supplied to the motor. If after that the system has not received pulses from the tachometer, the power is removed from the engine and a second attempt is made after a few seconds. After the 4th attempt, the module energizes the timer motor to switch to a new operation code - washing. On the new operation, everything is repeated until the programmer reaches the STOP position.
This behavior of washing the machine can actually be observed when the hostess complains that the machine is doing everything, but the drum is not rotating.
It is impossible to unequivocally diagnose that the module is faulty, since the motor may be faulty (brush wear). It should also be noted that the results of the autotest on the machine itself must be treated with caution, and they can be used only after all elements and nodes interacting with the module have been checked.
Testing with jumper "b" allows you to check the filling valve control module - between contacts C01 (CNC) and B12 (CNB) there must be a voltage of 220 V.
Testing with jumper "c" of the circuit allows you to check the drain pump control module - between contacts C01 and C02 (CNC) there must be a voltage of 220 V.
If none of the tests starts, it is necessary to check the presence of voltages of 24 and 5 V at the output of the power module. If there is a log. "1" on pin. 4 and 5 U1 in accordance with the modification of the engine control module (if there is a discrepancy in the signal outputs of PA5-6), do not rush to assume that the microcontroller is faulty - there may be a situation when this is caused by an incorrect combination of input signals to U1.
In order not to damage the MK U1, all measurements at its terminals must be carried out with a device with a large input impedance.
Strength elements used in the DMPU module
The types of triacs used in the DMPU module are shown in Table. 5.
Table 5. Types of triacs used in the DMPU module
| Triac type | Type of shell |
|---|---|
| VTV24 | TO-220 |
| Tue16 | TO-220 |
| VTV08 | TO-220 |
| VTV04 | TO-220 |
| BT134 | SOT-82 |
| Z00607 | TO-92 |
The appearance and pinout of triacs in TO-220, TO-92 and SOT-82 cases are shown in fig. 9
Rice. 9
Triacs are checked with an ohmmeter, while the conductivity should be only between terminals A1 and G (1 and 3 for SOT-82).
The appearance and pinout of transistors VS337 and VS327 used in the module is shown in fig. 10,
Rice. 10
and a 5 V stabilizer (LM78L05 or KA78L05A) in fig. eleven.
The module uses diodes of the type: 1N4148 and 1N4007.
Common Element Defects in a DMPU Module
Power Module:
- open resistance R51 (A, B);
- failure of the stabilizer U3;
- failure of the zener diode D24 (short circuit);
- open varistor VDR5.
Engine control module:
- failure of the relay K1, K2;
- failure of the triac TR2.
Command generation module:
- failure of diodes D1-D6, D9-10, D15, D23.
Load control modules (timer, filling valve and drain pump):
- failure of triacs TR1, TR4, TR5;
- breakage of printed wiring tracks in power circuits.
In addition, often the inoperability of the DMPU module can be associated with burning of the contacts of the CNA, CNB and CNC connectors.
The article was prepared based on the materials of the magazine "Repair & Service"
Good luck with the repair!
If you want to call an Ardo washing machine repairman, we recommend the ExRemont service.
Use the services of qualified craftsmen
All the best, write to © 2007
Continuing the theme of describing and repairing the electronic modules of washing machines, this article discusses the MINISEL, MINIUDC, MINI AC and MINI DC modules.
General information
The MINIUDC electronic module is the basic one, and the MINISEL, MINI AC, MINI DC modules are its modifications.
On the basis of these modules, many washing machines (SM) are produced under the brands ARDO, ASKO, EBD, INOX, ELIN, EUROTECH, SAMSUNG, SUPRA, NORDMENE, WHIRLPOOL, etc. All these modules are used in SM with a program selector (without a command device). The appearance of one of the modules of this family - MINI AC, with the radiator of the triac of the drive motor removed, is shown in fig. 1.
Modules have many varieties, but the basic composition of the elements in their composition remains almost unchanged. This does not mean that all modules are interchangeable - they use, for example, different firmware versions as part of the processor chip, there are differences in the set, ratings and types of components, in some cases the layout of the elements has been changed. The use of one or another type of module depends on the functionality of the SM (for example, the difference in spin speed), the set and connection scheme of the elements that make up a particular machine. In addition, some elements on the modules can be made in SMD design. Another characteristic difference between the modules is the ability to work with various types of drive motors (AC and DC). If the module is designed to control a DC commutator drive motor, a rectifier and a special coil are installed in it (they are shown by arrows in Fig. 2). On fig. 3 shows the appearance of the MINISEL module with indication and control boards, designed to work with an AC commutator drive motor. Jumpers are installed on it instead of the coils and rectifiers mentioned above.
Note
The use of DC commutator drive motors is due to the fact that they more accurately maintain a given rotation speed under various loads. This is especially important at low speeds (the rotation speed of the CM drum is about 100 rpm) - it is at low speed that the imbalance of the CM drum with the laundry loaded into it is checked.
CMs with these motors are less "noisy".
The main structural difference between DC and AC collector motors is that in the first case, the stator and rotor windings are wound with a thinner wire and have a larger number of turns.
Rice. 1. Appearance of the MINI AC module (without heatsink)
Rice. 2. Appearance of the MINISEL module (version for DC drive motor)
The modules of the above family are designed to control the following external elements and SM nodes:
drive motor;
Water inlet valves;
Drain pump (pump);
Front panel indication elements (installed on a separate board);
Hatch door lock.
The modules receive signals from the following elements and nodes of the SM:
From the program selector;
From the tachogenerator coil of the drive motor;
From the water level sensor (pressostat);
From function buttons;
From the temperature sensor;
From the spin speed controller (if provided in a specific configuration).
All the listed modules have a built-in function for checking the operability of the SM components - a test mode.
Composition and description of the modules
The circuit diagram of the MINI DC module is shown in fig. 4, and block diagrams of washing machines based on the MINISEL module - in fig. 5 (ASKO), fig. 6 (ARDO "AED 1000X") and fig. 7 (ARDO "AE 1010"). As can be seen from the figures, the schemes for connecting the external elements of the modules are similar, their main external difference is a different set of external display and control boards.
Before considering the description and operation of the components of the modules, let's dwell on the purpose of the contacts of their external connectors.
Note
In some MINISEL modules, the 10-pin CNF power connector may consist of one or more connectors. Let's list these options:
1. CNF (10 pins);
2. CNF (4 pins) and CNT (6 pins);
3. CNF (4 pins), CNT (5 pins) and heating element power circuit (1 pin connector).
Pin assignment of module connectors
The modules have the following connectors: CNA, CNB, CNM, CNS, and CNT/CNF (see Figure 4-7). In addition, the module board provides a place for a service connector (its location is shown by an arrow in Fig. 1). Using the MINI DC module as an example, we present the composition and purpose of the contacts of the module connectors (see Table 1).
Recall that in this family of modules, the NEUTRAL network bus (pin 3 of the CNF connector) is combined with the +5 V power line (see Fig. 4).
Rice. 3. Appearance of the MINISEL module with front panel boards (version for AC drive motor)
Table 1. Pin assignment of the external connectors of the MINI DC module
| Contact number | Purpose |
| CNA connector |
|
| Voltage +5 V (the line is combined with the NEUTRAL bus ("Earth") of the 220 V network |
|
| Control panel output line |
|
| CLK clock line |
|
| Input data line |
|
| LED power control line |
|
| CNB Connector |
|
| Power supply for water inlet valves 220 V (from the contact group of the hatch lock) |
|
| Triac output for water inlet valve control (1) |
|
| Triac output for water inlet valve control (2) |
|
| Power supply 220 V - reserve (from the contact group of the hatch lock) |
|
| Triac output - reserve (1) |
|
| Triac output - reserve (2) |
|
| Power supply of the pump 220 V (from the contact group of the hatch lock) |
|
| Triac output pump control |
|
| Line for switching on the pump in case of tank overflow (from contact P16 of the pressure switch) |
|
| CNF Connector |
|
| Power supply 220 V FASE (PHASE) |
|
| 220 V (NEUTRAL, "Earth"), connected to the +5 V line and to the F4 contact |
|
| 220 V (NEUTRAL, "Earth"), connected to contact P11 of the water level sensor (pressure switch), connected to contact F3 |
|
| The output of the contact group of the relay (RL1) of the power supply circuit of the heating element |
|
| Not used (monitoring 1 water level in the tank), combined with contact F7 |
|
| Level 1 pressure switch output (terminal P14), connected to terminal F6 |
|
| Triac output for hatch lock control |
|
| Power supply of the heating element (from the hatch blocking contact group), connected to the F10 contact |
|
| Input from the contact group of the hatch lock, connected to contact F9 |
|
| CNM connector |
|
| 220 V power supply for drive motor (thermostat input) |
|
| Contact for connecting the middle output of the stator winding of the drive motor |
|
| Power supply 220 V drive motor (output from the thermostat) |
|
| Stator winding contact (1) |
|
| Stator winding contact (2) |
|
| Rotor winding contact (1) |
|
| Rotor winding contact (2) |
|
| The signal from the tachogenerator |
|
| General tachogenerator |
|
| General temperature sensor |
|
| Signal from NTC temperature sensor |
|
| CNS Connector |
|
| Program selector signal |
|
| General program selector |
|
| General governor |
|
| The signal from the speed controller |
|
| Service connector |
|
| External Processor Initial Reset Signal |
|
| Clock signal 50 Hz (from mains) |
|
| CLK clock line |
|
| data line |
|
| Drive motor reverse control line signal (pin 18 U1, key Q11, relay RL2) |
|
| Control line signal "1 level" of the pressure switch |
|
Rice. 4. Schematic diagram of the MINI DC module (for DC drive motor)
Rice. 5. Block diagram of ASKO CM with MINISEL module
In the CNA connector, depending on the type of control panel, the purpose of the information lines may differ.
Purpose and composition of the main nodes of the modules
Consider the purpose and composition of the main units of the modules using the example of the MINI DC module (see. circuit diagram in fig. 4).
The modules under consideration include the following nodes:
Microprocessor U1 family M68HC08;
Power node;
Command generation unit;
Node of adjustments;
Temperature control unit;
Tachogenerator;
Water level control unit;
Control unit for water inlet valves, pump, heating element;
Drive motor control unit.
Rice. 6. Block diagram of CM ARDO "AED 1000X" (MINISEL module)
Rice. 7. Block diagram of SM ARDO "AE 1010" (MINISEL module)
Microprocessor
MINISEL, MINI AC, MINI DC and MINIUDC electronic modules use MOTOROLA microprocessors of the M68HC08 family, such as MC68HC908JL3(8).
The microprocessor has:
8-bit kernel;
4672 KB Writable Mask ROM
(this memory stores the control program CM);
128 bytes RAM;
12-channel 8-bit ADC;
Universal I/O ports (23 lines);
2-channel 16-bit timer.
The purpose of the lines of the universal input / output ports (PTA, PTB, PTD) may vary depending on the processor control program.
The microcircuit can be made in 20- or 28-pin PDIP or SOIC packages.
To control the processor, external signals RESET (pin 28 U1) and IRQ (pin 1 U1) are used.
With regard to this module, the RESET signal is used to initial reset the processor in the mask ROM external programming mode through the service connector, and the IRQ signal is used to clock the internal components of the microcircuit (frequency 50 Hz) using the R16-R18 R50 D5 D6 C11 circuit (only after the lock is activated sunroof lock).
For the operation of the processor, it includes a clock generator, the frequency of which is stabilized by an external quartz resonator (4 MHz).
The pin assignment of the U1 chip (Fig. 4) in the PDIP-28 package in relation to the MINI DC module is given in Table. 2.
Unfortunately, the circuit designs of this family of modules are made in such a way that the circuits between the processor and the external elements of the module are practically not protected from possible external electrical influences, which often leads to various failures of the modules themselves.
One of the main advantages of these modules is the simplicity and availability of elements for replacement (except for the microprocessor). We also note that the SM control program is stored in the mask ROM of the microprocessor, and module failures caused by the destruction of the contents (malfunctions) of the memory are a fairly rare occurrence.
Power node
The power supply (PS) of the modules includes a step-down network transformer (T1), a rectifier (D11-D14), filtering capacitors (C3-C5, C8) and an integrated voltage regulator U3 (7805). The power supply generates constant voltages of +12 V (unstabilized, supplies transistor switches to control the relay RI1-RL4) and +5 V (stabilized, supplies the microprocessor and other components of the circuit). Command Formation Node
Table 2. Designation and pin assignment of the microprocessor U1 (MC68HC908 JL3)
| Output number | Signal designation | Purpose |
| Interrupt signal input (clocking) with mains frequency |
||
| Terminals for connecting an external quartz resonator |
||
| Triac control output (reserve 1) |
||
| Supply voltage +5 V |
||
| Triac control output (reserve 2) |
||
| Pump triac control output |
||
| Temperature sensor input |
||
| Program selector signal input |
||
| Signal input from the drive motor speed controller |
||
| Relay key control output RL3 (spin / wash) - switching of the drive motor windings in the wash and spin modes |
||
| Relay key control output RL4 - drive motor reverse control |
||
| Input for monitoring the performance of the triac of the drive motor |
||
| Front panel indicator control signal output |
||
| Input signal reaching "level 1" from the pressure switch |
||
| Relay key control output RL2 - drive motor reverse control |
||
| Triac control output for sunroof lock |
||
| Data signal output to control panel |
||
| Synchronization signal output to the control panel |
||
| Drive motor triac control output |
||
| Triac control output of the water inlet valve |
||
| Data input from the control panel |
||
| Input signal from the tachogenerator (from the amplifier) |
||
| Tachogenerator signal input (no amplification) |
||
| Relay key control output RL1 (heater control) |
||
| External initial reset signal |
This node serves to receive commands from the program selector and buttons for additional modes, convert them and transfer them to the corresponding inputs of the microprocessor U1.
The program selector is a potentiometer (voltage divider), the signal from which is fed to the ADC of the microcontroller (pin 11 U1). The signal is converted into a digital code and then decrypted. The control program of the microprocessor uses the data from the selector to perform the specified washing programs CM.
As an example, in fig. 4 shows the conditional correspondence of the selector resistance ratings to the selected SM programs.
In addition to the program selector, the microprocessor receives codes from the control panel that correspond to pressing one or another function button. The control panel board is connected to the U1 chip using a digital bus through a CNA connector.
In the case under consideration (Fig. 4), the control board is based on an 8-bit shift register of the 74PC164 type (M74HC164 or other modifications). This microcircuit exchanges control information with the U1 microprocessor, polls the status of the function buttons, and also controls the LED indicators.
In other types of SM, various control panel options can be used. In any case, data exchange between the main module and these nodes is carried out via the digital bus described above (CNA connector).
Knot of adjustments
As part of this unit there is a regulator for setting the rotation speed of the drum (during spinning). It works on the same principle as the program selector (see above). The signal from the regulator is fed to the pin. 12 U1.
Note that in some varieties of SM this regulator may be absent - its functions are performed by a functional button and an LED speed indicator on the control panel.
Temperature control unit
The main purpose of such a node is to maintain the set temperature of the water in the tank.
Temperature control is carried out using a thermistor (installed on the SM tank), the signal of which, through the R24-R26 C28 circuit, is fed to the ADC input (pin 10 U1) for further processing. The voltage level from the temperature sensor varies depending on the temperature of the water in the SM tank.
After processing the signal from the temperature sensor, the microprocessor, in accordance with the selected washing program, controls the activation of the heating element along the circuit: pin. 27 U1 - key Q12 - relay RL1.
Tachogenerator assembly
The unit is designed to convert an alternating sinusoidal voltage with a variable frequency, coming from the output of the drive motor tachogenerator, into a sequence of rectangular pulses of a fixed amplitude. The assembly includes elements Q13, D8, C22, R23.
Water level control unit
The unit is designed to monitor the state of the water level sensor (pressure switch) - closing / opening of the contact groups P11, P14, P16 (see Fig. 4, 6 and 7). The sensor has three states: "empty tank", "1st level" and "overflow level". In the first case, contact P11 does not close with either of the other two - this means that the water in the tank has not reached the "1st level" (or there is no water in the tank at all).
When the water reaches the "1st level", the contacts P11-P14 of the pressure switch are closed, power is supplied to the contact group of the heating element relay (RL1). This is done to prevent false activation of the heating element without water in the tank - in such a case, the heating element may fail. The control signal for reaching the "1st level" is fed through the circuit D9 D10 R39 R40 C18 to the pin. 17 U1.
In the state of the sensor "overflow level" (contacts P11-P16 of the pressure switch are closed), the signal to the microprocessor is not received, but power is automatically supplied to the pump - it starts to drain water from the tank.
It should be noted that in some SMs not one, but two pressure switches are used (see Fig. 5), one of them signals the achievement of the "1st level", and the second - the "overflow level".
Control unit for water inlet valves, hatch blocking and pump
The node is the following set of control schemes for the actuators of the CM:
Water inlet valves - triacs Q3, Q4, resistors R4-R7 (control from pin 2 and 23 U1);
Pumps - triac Q7, resistors R12, R13 (control from pin 9 U1);
Hatch door lock assembly - triac Q2, resistors R14, R15 (control from pin 19 U1);
Reserve (2 channels) - triacs Q5, Q6, resistors R8-R11 (control from pin 6, 8 U1).
Drive motor control unit
The node has the following schemes:
Switching of the windings of the drive motor (reverse, spin / wash) - keys Q8, Q9, Q11 and relay RL2-RL4 (controlled from pin 13, 14 and 18 U1);
Drive motor rotation speed control - transistor Q10, triac Q1 (control from pin 22 U1);
Controlling the speed of rotation of the drive motor (the signal from the tachogenerator is fed to the amplifier-shaper on the transistor Q13, and from it to pin 25 U1).
Typical module malfunctions and solutions
Note
1. The malfunctions described below are mostly related to defects in the electronic modules themselves. Malfunctions of other SM nodes will not be considered in detail.
After turning on the SM, the indication does not turn on, there is no control from the front panel, the door hatch lock is not blocked
If there are signs of such a malfunction, first of all, it is necessary to check the power source and the level of constant voltages (5 and 12 V) at its outputs. If there is no voltage at the output of the power supply, check the corresponding elements - a mains switch, a mains filter, a power transformer T1, a rectifier (D11-D14), etc.
Also, the most common cause of such a defect is the failure of the U1 chip. As noted above, the modules of this family have a minimum of buffer elements that protect the U1 pins. If water (foam) gets on the module board, then under the influence of moisture local breakdowns occur on it, as a result of which the mains voltage can be supplied to the signal circuits of the electronic circuit. The consequences are obvious - most often the module has to be changed, since it is problematic to separately purchase such a processor with a control program flashed in its memory.
Very often, the reason for the failure of the processor is the case when water (foam) gets on the contact block of the drive motor (on it, in addition to the contact groups of the power circuits, there are contacts of the tachogenerator signal circuit). The consequences are similar to those described above - not only the elements of the amplifier-shaper on the Q13 transistor, but also the input circuits U1 (pin 25, 26) can fail.
Roughly assess the performance of the microprocessor can be on the following grounds:
The presence of generation at the terminals of a quartz resonator. It may be absent due to a malfunction of the resonator itself or a violation of its soldering;
If on the output 28 U1 (RESET) there are pulses with a duration of about 25 ms, which means that the microprocessor is faulty. This situation is possible due to the fact that after power-up, for various reasons, the microprocessor does not generate an internal initial reset signal, as a result, the internal watchdog timer automatically turns on and its output pulses can be observed on the pin. 28. Once again, we note that the specified output of the initial reset in the processors that are part of the modules under consideration is used only in the memory programming mode from the module's service connector;
Significant heating of the processor case (more than 50°С). As a result, a voltage drop across the pin is possible. 7 microcircuits (significantly less than 5 V);
Immediately after the SM is turned on, one or more relays “trigger” on the module (provided that the transistor switches of these relays are in good order).
The SM may work normally, but there is a smell of burnt plastic in the water heating or spin modes. It is also possible that, after turning on the CM, the indicators on the front panel are lit, but no operation is performed
To determine the cause of this malfunction, it is enough to conduct a visual inspection of the electronic module - often in the area of the CNT / CNF power connector, traces of darkening of the printed circuit board and even burnouts will be visible. Before deciding to replace the connector, it is necessary to determine the cause of such a defect - it can be, for example, a local “breakdown” on the heater body or simply a poor-quality contact in the connector itself.
In such a case, do the following:
Check which power load caused the increased current through the specified connector;
They check the soldering of the connector, the heating element relay (RL1) and other elements whose soldering quality is in doubt. Also pay attention to the integrity of the resistor R54 (it is located next to the connector);
If necessary, jumpers between the dual contacts of the specified connector - F1-F2, F3-F4, F6-F7 and F9-F10 are soldered with a thick tinned wire. As practice has shown, one of the disadvantages of the modules of the family under consideration is the low reliability of such power connectors (especially mating parts) - even on new modules (for example, when the heating element is on), the contact groups of the connector heat up noticeably;
Measures are taken to ensure that the mating part of the connector has reliable contact with the male part (for example, by replacing individual contact groups).
If signs of such a defect appear, the contact groups P11-P14 of the pressure switch, the hatch blocking device (BP2-BP3) and the heating element relay (RL1) are also checked.
If the indicated actions did not lead to the elimination of the malfunction, the processor is probably out of order and therefore the entire module needs to be replaced.
When the washing program is running, the CM drum starts to rotate at an increased speed (it is possible that a few seconds after a sharp increase in speed, the drum stops)
The cause of such a malfunction may be a defect in the control and monitoring circuit of the drive motor. We list the elements and circuits that in such a case must be checked:
Triac Q1;
Resistors R1, R2;
The circuit for passing signals from the tachogenerator (from pin 8 of the CNM connector to pin 25, 26 of the U1 processor). If these signals are not already present on the connector, it is necessary to check the tachogenerator coil, as well as the fastening of its magnet;
The circuit for monitoring the health of the triac Q1 (in the case when, after a set of increased speeds, the drum does not stop after some time) - the following elements are checked: R3, R45, R46, D7, C15.
If the check of these elements and triac Q1 did not reveal a defect, the U1 chip is faulty, and therefore the entire module must be replaced.
During the washing process, the SM works normally. At the beginning of the spin cycle, the drum briefly starts to rotate at high speed, and then stops
The cause of such a malfunction can be both a failure of the triac of the drive motor and its controls. It is also necessary to check the signal flow path from the tachogenerator and resistor R54.
The CM hangs up during the unpacking phase before the spin cycle (no spinning). In CM models equipped with a display (marked with AED), the end of wash time may constantly change at this stage
In such a case, first check the tension of the drive motor belt - if it is stretched, the belt must be replaced.
Note that only in some models of SM ARDO it is possible to adjust the belt tension.
The most effective way to solve the above problem is to replace the module with a modified version of the processor firmware.
For example, the SM "ARDO AED 100X" uses the MINISEL module marked 546043300-01(02.03). The module with modified firmware at the end of the digital marking row has the code "04" (546043300-04). Another example with the "ARDO AED 800X" model - the module with updated firmware is marked 54641500-04. In SM, the drum does not rotate in any of the modes
First, the drive motor brushes are checked for wear or "hanging". You can roughly check the performance of the motor if, by connecting its stator and rotor windings in series, you apply mains power to them. As a ballast (or a safety element), any powerful load (for example, a heating element) can be included in the break in this circuit. A similar verification scheme is valid for AC collector motors.
The circuit for testing DC motors needs to be changed by adding a bridge rectifier to it.
The next step is to check the bridge rectifier (in the versions of the modules for DC motors, the rectifier has the reference designation P2) and the entire power supply circuit of the drive motor - the relay contact groups RL2-RL4, the reliability of the contacts in the CNM connector and in the block of the motor itself, as well as the serviceability of the triac Q1 and the presence of a PWM control signal from the pin. 22U1.
The CM drum in the washing mode does not rotate in reverse mode (it rotates after a pause only in one direction)
Most often, such a defect is caused by a malfunction (burning) of the contact groups of the RL2, RL4 relays or the control circuits of these relays.
There is no water heating or the temperature of the water in the tank is significantly different from the set value
In the first case, it is necessary to check the elements in the power supply circuit of the heating element (CNT / CNF connector, relay RL1 and its control circuits, pressure switch (for closing the contact group P11-P14), as well as the heating element itself and its protective thermostat T90).
If no defective elements were found during the check, it is necessary to check the NTC temperature sensor and its circuit (from pin 11 of the CNM connector to pin 10 of the U1 chip) - this already applies to both cases.
You can check the health of the temperature sensor, focusing on the data in Table. 3.
When the SM is turned on, water is poured into the tank, when the overflow level is reached, the pump is turned on. This process can only be terminated by turning off the SM
Such a case should not be confused with the so-called "self-draining" (or "siphon"), when the end of the drain hose is at a height of less than 50 ... 70 cm from the floor and all the water being poured flows "by gravity" through this hose. usually given in the operating instructions CM.
Consider options when such a situation is caused by a malfunction of the SM elements and the module.
In normal mode, the pump is controlled by a microcontroller, and in emergency mode, by a pressure switch (turns on automatically when the "overflow level" is reached). Therefore, when searching for the causes of this defect, this point should be taken into account.
First, they check the elements of the control circuit for the water inlet valves (triacs Q3 and Q4, etc.), the valves themselves (one of them could "stick" in the open state), and then the water level control circuits. Let's take a closer look at the last chain.
Table 3. Correspondence of the internal resistance of the NTC sensor to the ambient temperature
| Ambient temperature, °C | Temperature sensor resistance, kOhm |
|
As noted above, the water level is controlled by the pressure stat. It switches the corresponding contact groups in its composition, depending on the water level in the tank. The sensor has three states:
- "empty tank" - contacts Р11-Р12 are closed (not controlled by the module);
- "1st level" - contacts Р11-Р14 are closed (controlled by the module);
- "overflow level" - contacts Р11-Р16 are closed (not controlled by the module).
As for the state of the sensor "1st level", when the contacts P11-P14 are closed through an intermediate circuit, a low potential is supplied to the pin. 17 U1 (see item "Water level control unit").
When this signal arrives, the processor generates a command to stop filling the water (from pin 2 or 23 through the triacs Q3, Q4 - to the valves).
When, due to a malfunction of the elements of the specified circuit, the "1st level" signal does not reach the processor from the sensor - the valve does not shut off the water, the water in the tank reaches the overflow level - the water is drained and filled at the same time. Naturally, this cannot continue indefinitely, if only because the water inlet valve can quickly fail. It can be opened for a maximum of 3 minutes and then closed for at least 5 minutes
In such a case, when troubleshooting, the following algorithm should be followed:
Make sure that the CM is connected correctly - there is no "self-draining";
Determine what caused the pump to turn on - a press-compressor (overflow), a microcontroller, elements in the circuit between the processor and the pump or the "1st level" control circuit;
Based on the purpose described above and the composition of these circuits, the cause of the malfunction is determined.
In the spin mode, the CM drum does not rotate or rotates at low speeds (this is especially evident if laundry is loaded into the drum)
We have considered above one of the cases when there is no spin.
Here the situation is somewhat different - it is associated with a drop in the power of the drive motor. Such a defect can be caused both by a malfunction of the motor itself (due to interturn short circuits in its windings), and by a malfunction of the RL3 relay (switches the stator windings in the WASH / SPIN modes) and its control circuits. In some versions of the modules of the family under consideration, this relay is absent (an option when a drive motor is used without the middle output of the stator winding).
It should also be noted that this defect manifests itself if the belt tension between the pulleys of the drive motor and the drum is loosened.
Diagram and Service manual Ardo AE800X, AE810X, AE833, AE1000X, AE1010X, AE1033
Service manual for ARDO AED800, AED1000X, AED1000XT, AED1200x
Repair manual and diagram ARDO FLS105L
Scheme Ardo SE810, SE1010
Scheme Ardo SED1010
Service manual with diagrams ARDO T80
Diagram washing machines Ardo TL1000
Ardo A400, A600, A800, A1400, A6000, Ardo FL85S, FL85SX, FL105S, FL105SX, Ardo FLS85S, FLS105SArdo FLZ105S, Ardo Maria 808, Ardo S1000X, Ardo T80, Ardo TL400, TL610 80S, WD128L, WD800, WD1000
set the programmer knob 1 to the position "40 ° C, DELICATE WASH"
press button 2 and, while holding it, turn on the power supply of the CM with button 3
After that, the indicator lights for spin speed 4, washing phases 5, as well as all segments of the display 6, light up.
Next, the first step of the internal test is performed, during which the following are checked:
serviceability of the temperature sensor (for open and short circuit)
hatch blocking device. If no defective elements were found during the check, the first indicator lamp of the washing phases 5 from the top goes out and the message “1.25” is displayed on the display 4.
During step 1 of the internal test, you can check the functionality of buttons 2, 7, 8, 9 (Fig. 1): when you press the corresponding button, it lights up, when you press it again, it goes out. During this step, only one speed indicator light will be on . By pressing the buttons 10 - "START" and 11 - "DELAYED WASH" they also check their performance (lights up, goes out) - see above.
Then, if necessary, the subsequent steps of the internal test are performed (see Table 1). The transition from one step of the internal test to another occurs with a delay of several seconds, for this it is necessary to turn the programmer knob to the appropriate position
set the programmer knob 1 to the position "40 ° C, DELICATE WASH";
the spin speed control knob 7 is set to the “9 o’clock” position;
press button 2, and while holding it, turn on the power supply of the SM with button 3. After that, all the lights of the washing phase indicator 4 light up.
Next, the first step of the internal test is performed, during which it is checked:
serviceability of the temperature sensor (for open and short circuit);
serviceability of the pressure switch (water level sensor). The closure of its contacts must comply with the position “NO WATER IN THE TANK”;
hatch blocking device. If during the test no defective elements were found, the first lamp of the indicator of washing phases 4 goes out. pressed - goes out. You can then continue with the internal test (steps 2-5) by turning the programming knob