Samsung WA48H7400AW Service Manual page 22

Check Type for uSA
Power Check 9C1,9C2
AC
AC2
AC3
Communication
Check
AC4
AC5
AC6
Switch Check
BC2
(Main Relay
Check)
20 _ Troubleshooting
- Check the consumer's power conditions.
: Make sure to check the operating voltage. Connect a
tester to the internal power terminals during the Boil or Dry
operations and observe the washing machine's operation
carefully.
: Check the voltages.
(An Check occurs when under or over voltage is supplied.)
: Check whether a plug receptacle is used.
When the connecting wire is 1m, a momentary low voltage
may drop up to 10 V
- Main PBA fault (sometimes)
- The signals between the sub and main PBAs are not sensed
because of commuication 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.
Causes Remarks