Samsung RF28HMEDBSR Service Manual page 95

4-2-10. If Mid drawer 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.
If Panel Key is not
selected
② If Panel PCB Key is not selected
※ If it is not repaired with the above basic checking method
PCB Typical Ground J23 JUMMPER
The Voltage of KEY is
Working every 2msec/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
Start
room
Does R
Door switch
operate normally?
Is the
mid drawer room
connector of
inserted correctly
Is MAIN PCB
Connector (CN51) inserted
correctly?
Is signal of MAIN
PCB CN51 normal?
Is the lighting
operated when replace mid drawer
Panel-PCB?
① Check the wires of Mid drawer Room - disconnection, short between wires
② Recheck the control circuit of MAIN PCB Mid drawer Panel
③ Check the wire assembling between Panel and MAIN
Is a key pressed
continuously?
Is the PCB system
still operated by separating
of the mechanism?
Is the lighting operated
after replacing the Mid drawer
Panel-PCB?
Is a normal vol t age
outputted from MAIN PCB IC51
duri n g the key operati n g?
① Check the wire of Mid drawer Room - disconnection, short
between wires
② Check the short/open of the mid drawer panel lighting circuit in
MAIN PCB.
95
TROUBLESHOOTING
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.
① Replace MAIN PCB
② Check the short of MAIN
Panel wire