If Ice Water Is Not Supplied - Samsung RF4287HARS Service Manual

AW3 SM-EN 2011.3.31 2:56 PM 페이지92 in
TROUBLESHOOTING

4-2-11. If ICE Water is not supplied

1. Please shut the water supplying prior to repair.
2. Power is applied to the one end of wires. Be careful when disassembling not to get an electric shock.
Typical PCB Ground REG1 Heater Sink
☞ Checking method of voltage Based on PCB
typical Ground REG1 Heater Sink
1) Check the voltage of IC73#4(same voltage as
IC01 #104)
- ICE Water valve operating (about 5V±0.5V)
Based on PCB typical Ground REG1 Heater
Sink
2) IC73 #15 voltage
- ICE Water valve Waiting (about 12V±0.8V)
- ICE Water valve operating (about 0.7V±0.5V)
3) Check the voltage of Water Valve operating
(AC voltage)
=> For checking the Relay RY78 operating.
CN73 and CN74 combined and use same
connector(13p)
CN70-"11"(Red) ↔ CN73-"7"(Purple)
- ICE Water valve waiting (about AC 0V)
Start
Is the confirming sound of
the valve operation heard when
Ice maker test switch pushed?
Does Main PCB IC01
MICOM #7 voltage change
5V/0V?
Does Main PCB IC01
MICOM #104 voltage have
high(5V) output?
Is the contact point of main
PCB RELAY RY78 normal?
Does Main PCB
IC73 #15 have about 0.7V
output?
MAIN PCB normal
-- Need to check the other parts
① Check the wire between Ice
water valve↔MAIN PCB
② Ice water valve itself has trouble
or bad contact of connector
③ Check the connection hose
92
Normal(Check Ice
water valve hose)
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB