Samsung RT22 - Page 57

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TROUBLESHOOTING
4-2-8. When the Room Lamp (LED) does not light up
DOOR S/W works
normal (Open/Close)
IC10 MICOM #43 Output
Voltage is normal
Voltage Output at Pin
#2 & #4 (CN76) is
normal
Voltage Output at the
MAIN PCB Connector
(CN76) is normal (10~12V)
The LED Lamp is
connected properly
The LED Lamp is ok
Start
Check & Replace DOOR S/W
Replace / Repair PCB
Replace PCB
Check Connector Terminal /
Replace PCB
Check Connector Terminal
Replace LED LAMP
Normal
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Door & MICOM State
DOOR S/W
MICOM(#22)
Right
Close 5V
Open 0V(Low)
MICOM State
Door (Fridge)
R
#22
Close 5V
Open 0V(Low)
Q712(R)
Micom
CN76 2,4Pin
0V(Low) 0V(Low)
5V(High) 10~12V(High)