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Maytag ACM0720AB Service Manual page 18

2001-2003 countertop domestic microwave ovens
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Troubleshooting Procedures
Trouble 2:
Oven does not operate at all, display window does not display any digits, and
no input is accepted.
Fuse blows.
Disconnect one side
of the wire lead
connecting transformer
to high voltage
capacitor and operate
Fuse does
Check continuity
not blow.
16026268
Check continuity
of monitor switch
with door closed.
Check continuity
of primary switch
with door opened.
Check continuity
of secondary
switch with
door opened.
the unit.
Continuity
of thermostat.
Check continuity
of power
supply cord.
Malfuction of
Continuity
the monitor
switch.
No
Continuity
Malfunction of
Continuity
secondary
switch.
No
Continuity
Malfunction of
Continuity
secondary
switch.
No
Continuity
Failed
Normal
high voltage
capacitor.
Fuse blows
again.
Failed
high voltage
transformer.
Failed
thermostat.
No
Continuity
Failed
No
power supply
Continuity
cord.
18
Replace the fuse,
primary, secondary,
monitor switches
and printed
circuit board.
Replace the fuse,
primary, secondary,
monitor switches
and printed
circuit board.
Replace the fuse,
primary, secondary,
monitor switches
and printed
circuit board.
Replace
high voltage
capacitor.
Replace
high voltage
transformer.
Replace
thermostat.
Replace
power supply
cord.
©2005 Maytag Services

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