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DIAGNOSTIC
Does it sound Ding-Dong’ if you
press a button on front panel?
Start
Main PCB is normal, buzzer is
normal.
Check the panel PCB according to ,
how to check panel display’.
Buzzer is broken – – replace it.
Does it make a sound of
d
oor-opening’
alarm when you are open the doors of freezer or
fridge for more than 2 mins.?
Is there a bent, go-out, or any other
failure of the buzzer in the panel PCB?
Recheck for button pressing power and
framework problem.
YES
YES
NO
NO
YES
NO
Replace buzzer or panel PCB.
Did a component lead fall on the
vibration plate of buzzer?
YES
NO
68
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.
6565