Samsung RB195ACRS Service Manual page 60

NW-미주향-AC 2010.6.8 3:48 PM 페이지60 in
TROUBLESHOOTING
4-2-13. If refrigerator ROOM Lamp does not light up (F,R - Same condition) - LED
1. When you replace the lamp of freezer/fridge, please power OFF
[Explain cold-storage room lamp on the basis of.]
① When lightning of Panel PCB is disabled
Door
Close
Open
Door
Close
Open
☞ Output voltage checking method
-. PCB common Ground REG1 Heater Sink and
CN71-"5"(Pink) : measure the voltage (F LED Lamp)
CN71-"3"(Blue) : measure the voltage (R LED Lamp)
=> Picture is R LED Lamp operation below.
☞ Checking method of Door Switch voltage
-. PCB common Ground REG1 Heater Sink and
CN30-"2"(Brown) : measure the voltage (R Door Switch)
CN30-"1"(Black) : measure the voltage (F Door Switch)
=> See the R DOOR Switch at the following picture
Door & MICOM State
F R
MICOM(#60) MICOM(#52)
0V(Low) 0V(Low)
5V(High) 5V(High)
MICOM(LAMP) State
F R
MICOM(#31) MICOM(#32)
0V(Low) 0V(Low)
5V(High) 5V(High)
IC71 State
MICOM IC71 output
(#31/ #32) (#15/ #16)
0V(Low) 12V(High)
5V(High) 0V(Low)
Common PCB Ground
CLOSE
REG1 Heater Sink
OPEN
Common PCB Ground
CLOSE
REG1 Heater Sink
OPEN
Start
Is the Door switch
contact normal?
Yes
Is the output voltage
of IC10 MICOM #32
Normal?
No
Is the output voltage of
IC71 normal?
Yes
Is the main PCB connector(CN71)
insertion status normal?
Yes
Does the main PCB connector(CN71)
Output normal?(11~13V)
Yes
Is the LED Lamp connected
Properly?
Yes
Is the LED Lamp normal?
Yes
Normal / Re-check
60
No
Replace Door S/W
Yes
Replace PCB
No
Replace PCB/ Repair the IC71
No
Re-insert the connector
No
Check the connector terminal
Replace PCB
No
Check the connector terminal
No
Replace LED Lamp