Samsung RM255BABB Training Manual page 66

DIAGNOSTIC
3) If the buzzer doesn't sound
This model is equipped with the buzzer on the Panel PCB. If buzzer doesn't sound in case of button operation, forced operation
or door opening, separate the panel PCB first to check if buzzer is broken or there are any soldering failures.
It is not easy to troubleshoot it as the Panel PCB is made with SMD parts. You are strongly required to replace the assembly
with a new one, unless the failure is not serious, for example S/W pressing failure, surface part come-off, etc.
Start
Does it sound Ding-Dong' if you
press a button on front panel?
NO
Does i t make a sound of door-openi n g'
al a rm when you are open the doors of freezer or
fri d ge for more than 2 mi n s.?
NO
Is there a bent, go-out, or any other
fai l u re of the buzzer i n the panel PCB?
NO
Did a component lead fall on the
vibration plate of buzzer?
NO
Recheck for button pressing power and
framework problem.
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YES
Main PCB is normal, buzzer is
normal.
YES
Check the panel PCB according to ,
how to check panel display'.
YES
Buzzer is broken – – replace it.
YES
Replace buzzer or panel PCB.