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Troubleshooting Procedures
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge the high voltage
capacitor before servicing, unless testing requires power.
• Verify proper grounding before checking for trouble.
• Be careful of the high voltage circuit.
• Discharge the high voltage capacitor.
• When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from
these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading
or damage to your meter.
•
Do not touch any part of the circuit on the printed circuit board, since static electric discharge may damage the
control panel. Always touch yourself to ground while working on this panel to discharge any static charge built
up in your body.
Problem
No display and no
operation
(fuse tests OK)
No display and no
operation
(fuse blown)
Cannot program
oven
10
!
!
Possible Cause
Open or loose lead wire harness....................
Open thermal cutout (magnetron)
Open low voltage transformer
Defective Assembly PCB ...............................
Shorted lead wire harness..............................
Defective primary switch
Defective monitor switch
Shorted high voltage capacitor.......................
Shorted high voltage transformer
Key input is not in-sequence ..........................
Open or loose membrane key pad to
Assembly PCB connection .............................
Membrane panel shorted or open
Defective Assembly PCB ...............................
W ARNING
CAUTION
• Check wire harness, thermal cutout
• Check Assembly PCB. Also, if low
• Check adjustment of primary switch,
• Check measurement of high voltage
• See Operation Procedure and verify
• Check connections of membrane
• Replace Assembly PCB
16022923 Rev. 0
Correction
and low voltage transformer for loose
wires and continuity, tighten wires
where necessary or replace failed
component, if necessary. If thermal
cutout is replaced, check fan motor.
Replace if necessary.
voltage transformer is defective,
check/replace PCB.
monitor switch, power relay, door
sensing switch. Readjust/replace if
necessary. The primary, secondary
and monitor switch must be replaced
at the same time.
capacitor and high voltage
transformer. Replace if necessary. If
high voltage transformer is replaced,
check magnetron and diode.
program sequence
keypad to Assembly PCB,
tighten/reconnect where necessary.
©2004 Maytag Services
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