87
TROUBLESHOOTING
4-2-13. If Water is not supplied
☞ 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
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.
Normal(Check Ice
water valve hose)
Replace Valve
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB
Check soldering
short/Replace PCB
1) Check the dispensing
lever
2) Check switch unit/ wiring
connection
3) Replace PCB
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%)
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.
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