Samsung WA7750M Service Manual page 24

Check Type For USA
AC
AC2
AC3
Communication
Check
AC4
AC5
AC6
Switch Check
BC2
(Main Relay
Check)
DC
Door Check
DC1
DC2
22 _ Troubleshooting
- The signals between the sub and main PBAs are not sensed
because of communication Check.
- Check the connector connections between the sub and main
PBAs carefully.
→ Check for incorrect or loose connections, etc.
- Remove the sub PBA C/Panel and check for any faulty
soldering.
- The diagnosis of the I/O Board communication check.
- The signals between The DR Module and main PBAs are not
sensed because of communication Check.
- Check The connector connections between The DR Module
and main PBAs carefully.
→ Check for incorrect or loose connections, etc.
- Remove The DR Module and Check for any faulty soldering.
- The signals between The WIFI Module and main PBAs are not
sensed because of communication Check.
- Check The connector connections between The WIFI Module
and main PBAs carefully.
→ Check for incorrect or loose connections, etc.
- Remove the WIFI Module and Check for any faulty soldering.
- The signals between The LCD Module and main PBAs are not
sensed because of communication Check.
- Check The connector connections between The LCD Module
and main PBAs carefully.
→ Check for incorrect or loose connections, etc.
- Remove The LCD Module and Check for any faulty soldering.
- The signals between the Inverter PBA and main PBA are not
sensed because of communication Check.
- Check The connector connections between the Inverter PBA
and main PBA carefully.
→ Check for incorrect or loose connections, etc.
- Remove the Inverter PBA and Check for any faulty soldering.
- The Power button is pressed continually.
(for more than 12 seconds).
- A switch is jammed or stuck due to be pressed unevenly due to
deformation of the control panel or button.
- This Check may occur when the screws that hold the sub PBA
in place are tightened too much.
- A button other than the Power button is continually pressed.
(for more than 30 seconds).
- Deformation of an internal plastic injection part.
- A screw for assembling the sub PBA is tightened too much.
- A switch contact Check because of a deformation of the door
hook.
- When the door is pulled by force.
- This occurs in the Boil wash because the door is pushed due
to a pressure difference from internal temperature changes.
- The door lock switch terminal is connected incorrectly.
- The door lock switch terminal is broken.
- This occurs intermittently because of an electric wire leakage
- Main PCB fault.
- This occurs if the Power switch is turned on/off
continually and too much heat is generated (This
check is difficult to be reproduced.)
Causes Remarks
When the door is not
opened after the door
open operation.
When the door is not
locked after the door
close operation.