Unit Dead (Blank Display) (Diagnostic Chart); Control And/Or Display Does Not Operate Properly (Diagnostic Chart) - GE SCA1000 Technical Service Manual

Perform Low
Transformer Test.
Does low voltage
transformer pass
YES
Replace main
PCB.
Control and/or Display Does Not Operate Properly
Note: Use this diagnostic procedure if unit has one of the following malfunctions:
• No beep (check control program for beeper MUTE)
• Some or all keys do not operate (check for CONTROL PANEL LOCKED)
• Display does not show what was entered
• Display erratic
• Display blank (check control for display turned OFF)
• Cannot clear display
Replace main
PCB. If not fixed,
replace control
Unit Dead (Blank Display)
Check for continuity
between line and neutral
on power cord.
Is there continuity?
YES
Voltage
NO
test?
Replace low
voltage transformer.
Perform Low Voltage
YES
Perform Control
Panel Test.
Does control panel
YES
pass test?
Replace control
panel.
– 42 –
NO
Check the following
for an open:
!
Fuse
!
Cavity TCO
!
Magnetron TCO
All OK?
YES
Check wiring and
connectors for an
open condition.
Transformer Test.
Does transformer
NO
pass test?
Replace low
voltage
transformer.
NO
panel.
NO Repair or replace.