Samsung RF265AB, Service Manual

Page: 68 / 107

69
TROUBLESHOOTING
4-2-9. If Pantry Panel PCB is not working normally
You should check the display after door opening because the display of this model operates only when
the fresh food compartment door is opened.
Start
Does fresh food
compartment door switch
operate normally?
Is the connector of
pantry room in fresh food
compartment inserted
correctly?
Is MAIN PCB
Connector (CN78) inserted
correctly?
Is signal of MAIN
PCB CN78 normal?
Is the lighting
operated when replace Pantry
Panel-PCB?
Is a key pressed
continuously?
Is the PCB system
still operated by separating
of the mechanism?
Is the lighting operated
when replace Pantry
Panel-PCB?
Is a normal voltage
outputted from MAIN PCB IC74
in the key operating?
Check and repair the switch
* Refer to<how to repair door switch>
Reinsert Connector,
Repair bad contact
Reinsert connector in MAIN PCB
Check voltage/Replace MAIN PCB
Panel PCB itself has trouble.
Reassemble PCB ASS'Y /
Enforce the cancelation of
pressed keys
Reassemble PCB ASS'Y /
Enforce the cancelation of
pressed keys
Convertible compartment Panel
PCB itself has trouble.
Replace MAIN PCB
Check the short of MAIN
Panel wire
Check the wires of Pantry Room - disconnection, short between wires
Recheck the control circuit of MAIN PCB Pantry Panel
Check the wire assembling between Panel MAIN
Check the wire of Pantry Room - disconnection, short
between wires
Check the short/open of the pantry panel lighting
circuit in MAIN PCB.
If Panel Panel PCB Key is not selected
If Panel Key is not selected
If it is not repaired with using the basic checking method as above
typical PCB Ground
CN1#3(Black)
Checking method of voltage Based on
PCB typical Ground CN1#3(Black)
1) Key voltage ; CN78#1"(Purple)
2) LED part voltage ; CN78-"7"(Yellow),
"8"(Pink) Voltage of CN78 is same as
IC74 #12,#11 voltage.
1) select(operating) (0V) 2) normal(about5.0V 0.5V)
- Display On (0.7V 0.3V) - Display Off (9.7V 1V)