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Maytag ACM0720AB Service Manual Page 17

2001-2003 countertop domestic microwave ovens.
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Troubleshooting Procedures
Trouble 1: The following visual conditions indicate a probable failed control circuit.
1. Incomplete segments.
• Segment missing.
• Partial segment missing.
• Digit flickering (Note: Slight flickering is normal.)
2. Colon does not turn on or blink.
3. A distinct change in the brightness of one or more numbers in display.
4. One or more digits in the display are not lighting.
5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.
7. Display does not count down with time blinking or up with clock operation.
8. Display obviously jumps in time while counting down.
9. Display counts down too fast while cooking.
10.Each indicator light does not turn on after setting cooking cycle.
11. Display time of day does not reappear when cooking is finished.
12.Beep sound is not heard when correct pad is pressed.
Condition
No input can be
programmed.
1. Some inputs
cannot be
programmed.
2. Display shows
a number or
figure different
from one
touched.
3. Random
programming
when touching
other pads.
4. Display is fixed
at some figure
and can not
accept any
input.
©2005 Maytag Services
Check
Check the connection
between membrane key
assembly and PCB
assembly.
Replace key membrane
assembly and check
operation.
Result
• Continuity
• Failed PCB
assembly.
• No continuity
• Loose
connection.
• Failed key
• Everything
works as
membrane
specified.
assembly.
• Still have
• Failed PCB
trouble.
assembly.
17
Cause
Solution
• Replace PCB
assembly.
• Connect
them tightly.
• Replace key
membrane
assembly.
• Replace PCB
assembly.
16026268

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