Samsung RSJ1K Series, Service Manual

Page: 77 / 107

77
TROUBLE SHOOTING
4-2-10) When Water Tank Heater does not operate
Start
MAIN PCB is normal.
-- Check other parts.
Check Water Tank Heater Wire.
Check if the Heater is open.
- Check Power Plug
- Check Main Fuse (Blown)
- Check Wire Connections
NO
Do Forced Operation and
check it again with Comp on.
NO
Check if IC11(S3P84E9-
LOAD MICOM) #37 is 5V.
If it is 0V, replace MAIN
PCB.
NO
Replace RY79 Relay
NO
If it is 0 , check if Heater is short.
If it is
, check if there is wire-cut,
Heater is open or the connector is
slipped out.
If it is 0 , check if Heater is short.
If it is
, check if there is wire-cut,
Heater is open or the connector is
slipped out.
NO
NO
YES
YES
YES
YES
YES
YES
The refrigerator
operates normally.
Comp is operating.
5V is applied at MAIN
PCB IC74 #6.
RY79 AC terminals
are on.
There is a
resistance read at CN71#5
and CN70 #9.
The reading is
15~17K .
Caution
Before reading the resistances, plug
out the unit. Then, plug out the
connect from MAIN PCB and read
them at the wires.