69
TROUBLESHOOTING
4-2-10. When refrigerator ROOM Lamp does not light up
1. When you replace the lamp of freezer, please power OFF 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.
The case of fresh food compartment(room) lamp will be explained only.
Because it is possible to repair the other room lamps with the same method.
Start
Is the inside lamp
filament cut?
Is Lamp OFF by
bimetal operating?
Is the connection
point of R-door switch
normal?
Is the control relay
of the inside lamp in PCB
normal?(RY76)
Repair the inside lamp
Fresh food compartment
Lamp is applied only.
Repair door switch
Replace PCB and
Replace Relay
Check the connection of RDoor
switch and repair the inside lamp
socket
Reference
* The interior lamp relay operates lighting/lightout
according to door open / close.
* If interior 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
Reference
If the door is opened, the contact of door switch will be opened and MICOM will get applied 5V to finally sense Open.
If 5V has been sensed over two minutes afterwards, Door-Open alarm will sound Ding-Dong for 10 seconds in a oneminute cycle. For
that reason, if the door switch has failure, the refrigerator can make a Ding-Dong sound per a oneminute cycle. Please note the step
for its service.
Wait for returning time
of bimetal
When measure lamp resistance to the Wire
Resistance can be changed by Lamp input voltage.
(Actual measurement is below, it can be changed by
performance)
Checking method of Door Switch voltage
- Measuring voltage of Sensor Check Point #5(IC01 MICOM #58) on
PCB or CN30#8(White-black)
CN75#1(Gray)
- Compare time table after measuring
Measuring voltage of CN30#8(white-black)
CN75#1(Gray) are below
Fresh food
compartment lamp
CN70#1(Red)
CN71#1 (Blue) ;
10(33)Ohm
3 Ohm
Lamp ; 60W + 60W
Freezer
compartment lamp
CN70#1(Red)
CN71#3 (Purple) ;
15(66)Ohm
5 Ohm
Lamp ; 60W
typical PCB Ground CN10#3"(Black)
Door & MICOM State
Door
F
MICOM
(#50)
Close
Open
5V(High)
0V(Low)
0V(Low)
5V(High)
R MICOM(#3)
Right and Left
Summary of Contents for RF265AARS RF266AARS RF26NBRS1RF265AABP RF266AABP RF26NBBP1RF265AAWP RF266AAWP RF26NBSH1RF265AASH RF266AASH
Page 2: ......
Page 19: ...18 Refrigerator PRODUCT SPECIFICATIONS 2 9 Cooling Air Circulation Freezer ...
Page 120: ...119 8 1 Whole block diagram 8 Shematic Diagram AC115V AC115V AC115V 8 1 1 MODEL RF266 BETTER ...
Page 121: ...120 Shematic Diagram AC115V AC115V AC115V 8 1 2 MODEL RF265 GOOD RF26NB ...
Page 122: ...121 8 2 CIRCUIT DIAGRAM Shematic Diagram 8 2 1 Sheet 1 of 2 ...
Page 123: ...122 8 2 CIRCUIT DIAGRAM Shematic Diagram 8 2 2 Sheet 2 of 2 ...