Microwave Diagnostic Charts - GE ZEK957 Series Technical Service Manual

Microwave Diagnostic Charts

Microwave 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 Child Lock Out)
• Display does not show what was entered (check control for display turned OFF)
• Display erratic
• Display blank (check control for display turned OFF)
• Cannot clear display
Check ribbons.
NO Repair or replace.
Are ribbons OK?
YES
Perform Low-Voltage
Transformer Test.
Does transformer
YES
NO
pass test?
Perform Key Panel
Test.
Replace PCB.
Does key panel
YES NO
pass Test?
Replace key
Replace PCB.
panel.
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