Samsung RB195ACRS Service Manual page 58

NW-미주향-AC 2010.6.8 3:48 PM 페이지58 in
TROUBLESHOOTING
4-2-11. If refrigerator Room Lamp does not light up (F,R - Same condition)
1. When you replace the lamp of freezer/fridge, please power off/unplug AC Cord to avoid an electric shock.
2. Please keep in mind you could get burnt by the excessive heating of an incandescent light bulb.
3. Bimetal is installed in the refrigerator Lamp. Check that if Lamp may be OFF by bimetal. (It may be deleted per model.)
① When lightning of Panel PCB is disabled
Door & MICOM State
Door
Close
Open
Applied to the model using bimetal only. (Option)
Preliminary Inspection
· The inner lamp relay operates lighting/
lights-out according to door open/close.
· If inner lamp does not light, check the
noise of relay operation.
· Noise of relay operation sounds every
Door Open / Close.
· F-LAMP Relay -- RY75
· R-LAMP Relay -- RY76
Preliminary Inspection
If the door is opened, the contact of door switch will be opened and MICOM will get applied 5V and finally it senses the door open.
If it sense 5V for more 2 minutes afterward, Door-open alarm will sound "Ding-Dong" for 10 seconds in 1 minute cycle.
Therefore,if the door switch has failure, the refrigerator can make a "Ding-Dong" sound per 1minute cycle. Please refer this for its service.
☞ When measure the lamp resistance to the wire, → Resistance can be changed
by Lamp input voltage.
(Below is the actual measurement and the valued can be changed by function.)
F R
MICOM(#60) MICOM(#52)
0V(Low) 0V(Low)
5V(High) 5V(High)
☞ Fridge Lamp(Option)
CN72-#9(Red) ↔ CN71#3(Blue)
; 27Ohm± 10%
Lamp ; 40W (Basis on 120V)
☞ Freeze Lamp
CN72-#9(Red) ↔ CN71#5(Pink)
; 25Ohm± 10%
Lamp ; 40W(Basis on120V)
Start
Is the Door switch
contact normal?
Yes
Is the inner lamp
filament cut?
No
Is Lamp OFF by
bimetal operating?
Yes
Is the control
relay of the inner lamp in PCB?
(RY76)
Yes
Check the connection of RDoor switch and
check & repair the inner lamp socket.
☞ 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
58
No
Replace Door S/W
No
Replace the inside lamp
No
Wait for returning time of bimetal
No
1) Replace PCB
(Expected trouble)
-. IC71(#15, #16)
-. IC10(#31, #32)
-. Relay(RY75,RY76)
2) Bad connection of wire
-. CN71("5" Pink, "3" Blue
Common PCB Ground
CLOSE
REG1 Heater Sink
OPEN