Electrolux T5350 Service Manual page 123

Service Manual
123
The DLCU on I/O board type 10 contains an arming circuit that is charged when the door lock coil is to be activated.
For safety reasons, this arming circuit must be discharged when the door lock coil is not to be activated. If the arming
circuit for operating the door lock is charged when it is not supposed to be, an error message will be sent to the CPU.
CPU reads the error message when the door is locked and unlocked and generates an error. The error is ignored be-
tween these two occasions.
Possible causes:
• The error can bee caused by overloads and/or defective components in the DLCU on I/O board type 10.
41:22 SET SIGNAL NO TACHO. WAIT 5 MINUTES
Only on Pocket washer.
Pocket washer uses two I/O boards type 10, one for the "Loading side" and one for the "Unloading side".
This error relates to I/O board type 10 on "Unloading side".
See also corresponding error 41:2 for I/O type 10 on "Loading side".
The DLCU on I/O board type 10 counts the tacho pulses from the motor in order to guarantee that the drum is stand-
ing still before the door is opened. To ensure that the signal from the tacho generator is working correctly, DLCU com-
pares the tacho signal with a digital bit value from the CPU, which is due to the CPU having activated the motor (See
DLCU status indication).
Error will reset automatically after 5 minutes and door will then unlock.
The error message is filtered in such a way that:
• The digital bit value should have been active for more than 2 seconds.
• When the digital bit value goes low, tacho signal must be present.
• Test is only performed when door is about to unlock.
Possible causes:
• Open or shorted circuit to the tacho sensor.
• Damaged tacho sensor or magnet.
• Secondary fault due to a error in the motor system.
Recommended actions:
1. Check that motor is actually running.
2. Check there is voltage from tachometer output when motor is running.
3. Check that rotation is detected in DLCU status for the I/O type 10 board.
41:23 ACTUATOR CIRCUIT
Only on Pocket washer.
Pocket washer uses two I/O boards type 10, one for the "Loading side" and one for the "Unloading side".
This error relates to I/O board type 10 on "Unloading side".
See also corresponding error 41:3 for I/O type 10 on "Loading side".
The DLCU on I/O board type 10 continuously controls the circuit to the door lock solenoid. DLCU can detect an open
circuit (>50 kΩ) but not a short circuit. If case of an open circuit, CPU will show the error. The error will disappear if
the error is removed.
Possible causes:
• Open circuit to the door lock solenoid.
• Open circuit in the door lock solenoid.
• Error or open circuit in the I/O board 10 circuits.
Recommended actions:
1. Check resistance in door lock solenoid circuit. Correct reading is approx. 6 Ω.
2. Check if error "AC" still remains in DLCU status.