Samsung RF28HMEDBSR Service Manual: If Ice Water Is Not Supplied

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4-2-12. 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.
2) Ice Water(R) Valve
PCB Typical Ground J23 JUMMPER
☞ Checking method of voltage Based on PCB
typical Ground J23 JUMMPER
1) Check the voltage of IC73-"4"(same voltage as
IC01 "104", IC72-"3"(same voltage as IC01 "117")
- ICE Water valve waiting (about 0V)
Based on PCB typical Ground J23 JUMMPER
2) IC73-"13" and IC72-"14" 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)
=> The Relay RY78 and RY73 operating.
CN70-"5"(Red) <->CN73_1-"1"(Purple)
CN72-"3"(Gry) <->CN70_1-"1"(Org)
- ICE Water valve waiting (about AC 0V)
Start
Is the confirming
sound of the valve operation heard when
Ice maker test switch pushed?
NO
Does Main PCB IC01
MICOM #7 voltage change
5V/0V?
YES
Does Main PCB IC01
MICOM #104 voltage have
high(5V) output?
NO
Does Main PCB
IC73-"13" have about 0.7V
output?
YES
Is the contact
point of main PCB RELAY RY78
normal?
YES
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
97
TROUBLESHOOTING
YES
Normal(Check Ice
water valve hose)
NO
Check soldering
short/Replace PCB
NO
Check soldering
short/Replace PCB
NO
Check soldering
short/Replace PCB
NO
Check soldering
short/Replace PCB

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