Samsung RM255BABB Training Manual page 71

DIAGNOSTIC
6-8) If Indoor Lamp of Freezer/Refrigerator doesn't light
Caution!
1. When replacing the indoor lamp of freezer or refrigerator, please turn the power OFF to avoid an electric
shock.
2. Please be sure to avoid a burn by the excessive heating of incandescent light bulb.
An example of F-Room Lamp is presented as follows.
And you may apply the same principle and method to the other indoor lamps.
reference
The indoor lamp relay performs turn-on/turn-off as
the door opens/closes. If indoor lamp doesn't
light up, check up the operation noise of relay.
The noise of relay operation will be heard
whenever opening/closing the door.
Please see "10-4. Door SWITCH(S/W)" and "10-
4. AC LOAD Operation Circuit" in the "10-14.
Circuit Description" of manual, for the information
related to the inside lamp operation.
Reference
If the door is opened, contact of door S/W is opened and voltage of 5V is applied to MICOM to
finally sense the Openness. If 5V is sensed more than 2 minutes afterwards, Door-Open alarm
will sound 'ding-dong' for 10 seconds every 1 minute. For that reason, if the door S/W has a
failure, refrigerator makes 'ding-dong' sound every 1 minute. Please take note of it during service.
Start
Is the inside lamp filament broken?
NO
Is the point of contact of the
F-DOOR S/W normal?
YES
Is the control relay RY77
for the inside lamp in PCB normal?
YES
Check the F and R-door S/W connections and
check/troubleshoot the inside lamp socket.
70 70
YES
Replace
the inside lamp.
NO
Replace or troubleshoot
the door S/W.
NO
Replace or troubleshoot
control relay.