Samsung RF31FM Series Manual page 202

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6. Self Diagnosis & Trouble Shooting
6-11. If Pantry Panel PCB is not working normally
PCB Typical Ground J23 JUMMPER
The Voltage of KEY
is Working every 2m
sec/4min
☞ Checking method of voltage Based on
PCB typical Ground J23 JUMMPER
1) Key voltage ; CN51-"11"(Sky Blue)
a) Working: 2V±0.5V b) Normal: 0V
NO
Is the lighting operated
after replacing the Pantry
Panel-PCB?
NO
Is a normal voltage
outputted from MAIN PCB IC51
during the key operating?
YES
① Check the wire of Pantry Room - disconnection, short between wires
② Check the short/open of the pantry panel lighting circuit in MAIN PCB.
YES Convertible compartment
Panel PCB itself has trouble.
① Replace MAIN PCB
NO
② Check the short of MAIN
Panel wire
To do list
202