Samsung RS 24 Service Manual page 52

Diagnostics
10-6) If the panel PCB is not working normally:
1) Where lighting of the panel PCB is disabled, or only some lamps are disabled.
See Ref. 1: 'View of the
connection cabinet-door
for the wire assembly' in
the manual.
2) Where the Panel PCB key isn't selected:
- The basic check way : If you is troubleshooting in the basic method, then
Refer to the description of
circuit operation in the
manual 10-6) Key scan
and display Circuit
selection's, and measure
the wave pattern.(page 40)
Is the connector
of upper hinge cover inserted
Is the main PCB
connector(CN50) inserted
Is the connector of
door panel PCB connector inserted
Is lighting operated
normally when the exchange of panel
1. Check the door wire of freezer – the disconnection of wire, short between wires.
2. Check the CABI wire of freezer – the disconnection of wire, short between wires.
3. Check the panel lighting circuit section within the main PCB for short open.
Is the locking lamp lit on?
Aren't a key or more buttons
pressed continuously?
Isn't the PCB system
still operated by seperating of the
operated normally in the exchange
of panel-PCB?
wave form outputted from the main
1. Check the door wire of freezer – check the disconnection of wire, short between wires.
2. Check the CABI wire of freezer – check the disconnection of wire, short between wires.
3. Check for Short/Open of the Panel Lighting Circuit section in the main PCB.
Start
NO
normally?
YES
NO
normally?
YES
NO
normally?
YES
YES
PCB?
NO
YES
NO
NO
Operated by
YES
separation
mechanism?
YES
Is lighting
YES
NO
Is a periodic
NO
PCB IC9?
YES
52
Reinsert the connector. Troubleshoot
a poor contact.
Reinsert the connector in the main
PCB.
Reinsert the connector. Troubleshoot
a poor contact.
Panel PCB itself has trouble.
Recheck after the release of locking
function.
Reassemble the PCB ass'y/Enforce
the cancellation of pressed keys.
Reassemble the PCB ass'y/Enforce
the cancellation of pressed keys.
Trouble of Panel PCB has trouble
for itself.
1. Replace the main PCB.
2. Check the short wires of CoolSelect
Zone TM panel.