If Water Is Not Supplied; If Water Is Not Supplied - Samsung RFG297AARS Service Manual

TROUBLESHOOTING

4-2-13. If 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.
☞ Checking method of Valve resistance (Must power off
for checking)
Resistance can be changed by input voltage.
CN73 and CN74 combined and use same connector(13P)
CN70#9 (Red) ↔ 13P#5 (White-black)
- resistance value ; 404Ohm ± 7%)
** 0Ω: Short trouble / ∞Ω: Open trouble
Typical PCB Ground REG1 Heater Sink
☞ Checking method of voltage
Based on PCB typical Ground REG1 Heater Sink
1) Check voltage of IC73#3 (same voltage as IC01#53)
- Water valve operating (about 5V±0.5V)
Based on PCB typical Ground REG1 Heater Sink
2) IC73 #16 voltage
- Water valve operating (about 0.7V±0.5V)
3) Check the voltage of Water Valve operating (AC voltage)
=> For checking the Relay RY79 operating.
CN73 and CN74 combined and use same connector(13P)
CN70#9(Red) ↔ 13P#5(White-black)
- ICE Water valve waiting (about AC 0V)
- ICE Water valve operating (about AC 110(220)V ± 20%)
Start
Is the confirming sound of
the valve operation heard
when dispenser switch
pushed?
Is the valve unit normal?
Is the voltage of PCB IC01
MICOM #53 changed 0V~5V
according to switch On/Off?
Does Main PCB IC73 #3
have about 5V input?
Does Main PCB IC73 #16
have about 0.7V output?
Is the contact point of main
PCB RELAY RY79 normal?
MAIN PCB normal
-- Need to check the other parts
① Check the wire between water valve ↔
MAIN PCB
② Water valve itself has trouble or bad
contact of connector
③ Check the connection hose
④ Check the operation between Panel PCB
and MAIN PCB for Communication.
87
Normal(Check Ice
water valve hose)
Replace Valve
1) Check the dispensing
lever
2) Check switch unit/ wiring
connection
3) Replace PCB
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB