Samsung RS257BABB Service Manual page 53

Diagnostics
11-8) If CoolSelect Zone TM isn't operated normally (RS2556, RS2578)
1) If the lamp of CoolSelect Zone
Where the Panel key isn' t selected:
1.Check the wires of CoolSelect Zone
2. Check the Lighting Circuit of CoolSelect Zone
3. Check the main PCB of CoolSelect Zone
the panel and main PCB.
2) Where the Panel PCB key isn't selected:
- The basic method is applied to check – if you fail in troubleshooting after above the execution, then
� Refer to 8-7) CoolSelect Zone
Panel Circuit and measure the
wave form.
1. Check the wires of CoolSelect Zone
2. Check Short/Open the Lighting Circuit section of CoolSelect Zone
3. Check the inside main PCB of CoolSelect Zone
between main PCB.
TM is not lit.
Start
Is the connector of
CoolSelect Zone inserted correctly
TM
in the fridge?
YES
Is the connector of main
PCB (CN51) inserted correctly?
YES
Is the connector of
CoolSelect Zone TM panel PCB
inserted ?
YES
Is lighting operated
normally when the exchange of CoolSelect Zone
panel PCB?
NO
TM – check the disconnection of wire, short between wires.
TM panel in the main PCB for Short/Open.
TM assembly for Short; the state of wire assembly between
Aren't a key or more pressed
continuously?
YES
Isn't the PCB system
still operated by separation?
YES
Is lighting operated
normally after the exchange of
panel-PCB?
NO
TM ,
Is a periodical wave
form outputted from the main
PCB IC5,IC4?
YES
TM – check the disconnection of wire, short between wires.
TM ass'y for Short; the state of wire assembly
53
NO
Reinsert the connector; troubleshoot
NO
Reinsert the connector in the main
NO
Reinsert the connector; troubleshoot
YES
TM
Panel PCB has trouble for itself.
NO
Reassemble the PCB ass'y/Enforce
the cancellation of pressed keys
NO
Reassemble the PCB asswmbly and
Enforce the cancellation of pressed keys
YES
Panel PCB has trouble for itself.
NO
1. Replace the main PCB.
2. Check the wires of CoolSelect Zone
panel for Short.
TM panel in the main PCB from.
a bad contact.
PCB.
a bad contact.
TM