If Mid Drawer Panel Pcb Does Not Work Normally - Samsung RF4287HARS Service Manual

AW3 SM-EN 2011.3.31 2:56 PM 페이지90 in
TROUBLESHOOTING
You should check the display after door opening because the display of this model operates
only when the fresh food compartment door is opened.
If Panel Key is not selected
Common PCB Ground
REG1 Heater Sink
☞ Checking method of voltage Based on PCB typical
Ground REG1 Heater Sink
1) Key voltage ; CN51-"11"(Sky Blue)
a) Working: 2V±0.5V b) Normal: 0V
Start
Does Fresh food &
Flex zone Door switch operate
normally?
Is the connector
of Mid Drawer Room inserted
correctly
Is MAIN PCB
Connector (CN51) inserted
correctly?
Is signal of MAIN
PCB CN51 normal?
Is the lighting
operated when replace Pantry
Panel-PCB?
① Check the wires of Flex Room - disconnection, short between wires
② Recheck the control circuit of MAIN PCB Flex Panel
③ Check the wire assembling between Panel and MAIN
② If Panel PCB Key is not selected
※ If it is not repaired with the above basic checking method
The Voltage of KEY is
Working every 2msec/4min
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.
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.
Is a key pressed
continuously?
Is the PCB system
still operated by separating
of the mechanism?
Is the lighting operated
after replacing the Pantry
Panel-PCB?
Is a normal voltage
outputted from MAIN PCB IC74
during the key operating?
90
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.
① Replace MAIN PCB
② Check the short of MAIN
Panel wire