GE PSC21MGM, Technical Service Manual

Page: 44 / 76

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Unit Dead, No Sound & No Cooling
Are the interior lights on?
Check for 120VAC at 6 pin
connector at rear of unit.
Do you have 120VAC?
Check house supply voltage.
Do you have 120VAC?
Advise consumer to call
an electrican!
No
Run Service Diagnostic Test ( 1-3 )
Pre-Chill - see page 33 for entering
service diagnostics
Does unit start to run?
Run Sevice Diagnostic Test ( 0-7 )
Thermistor test - see page 33 for
entering diagnostic mode
Do the thermistors test OK?
Replace Board No
Follow all steps in thermistor
test to determine problem
No
Repair wire and connection
at 6 pin connector !
Yes
Check dispenser and temperature
control lights!
Do they work?
Yes
No
Unplug J2 connector from
control board.
No
Yes
Yes
Yes
Repair or replace
power cord
No
Check for 12 VDC at
control board pin J2-8 to
J2-3 Do you have voltage
Yes
Short in fan motorcircuits!
proceed to fan flow charts
Replace control board and check
all fan motors circuit for shorts. If short
is dectected repair short or replace fan
motor. Failure to replace shorted
component will damage the new
control board upon installation
No
Caution: Unplug power when disconnecting and
connecting connectors on the board.