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High Voltage Diode; High Voltage Transformer; Fan Motor; Turntable Motor - Maytag ACM0720AB Service Manual

2001-2003 countertop domestic microwave ovens
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Testing Procedures
!
WARNING

High Voltage Diode

1. Disconnect power to oven and remove outer case,
(see "Outer Case" section in Disassembly
Procedure).
2. Discharge high voltage capacitor, (see "High Voltage
Capacitor" section in Disassembly Procedure).
3. Disconnect wire leads to high voltage diode.
4. Measure resistance of diode with meter leads.
Reverse meter leads and measure again. Normal
reading would be continuity in one direction and
infinity in the other. An abnormal reading would be
continuity or infinity in both directions.

High Voltage Transformer

1. Disconnect power to oven and remove outer case,
(see "Outer Case" section in Disassembly
Procedure).
2. Discharge high voltage capacitor, (see "High Voltage
Capacitor" section in Disassembly Procedure).
3. Disconnect wire leads to high voltage transformer.
4. Measure resistance of the terminals on the high
voltage transformer with meter on R x 1 scale.
ACM1120, ACM1420, ACM1460, ACM2160 reading
should be indicated as follows:
Primary winding ......approximately 0.2 to 0.4 ohm
Filament winding ....less than 1 ohm
Secondary winding .. approximately 60 to 90 ohm
ACM0720, ACM0860, MMC5086, UMC1061,
UMC5200 reading should be:
Primary winding ......approximately 0.3 to 0.8 ohm
Filament winding ....less than 1 ohm
Secondary winding . approximately 100 to 200 ohm
5. Measure resistance of the terminals on the high
voltage transformer with meter on high scale.
ACM0720, ACM0860, ACM1120, ACM1420,
ACM1460, ACM2160, MMC5086, UMC1061 reading
should be indicated as follows:
Primary winding to ground ....... Infinite ohms
Filament winding to ground ..... Infinite ohms

Fan Motor

1. Disconnect power to oven and remove outer case,
(see "Outer Case" section in Disassembly
Procedure).
2. Discharge high voltage capacitor, (see "High Voltage
Capacitor" section in Disassembly Procedure).
3. Disconnect wire terminals from fan motor.
4. Measure resistance of fan motor from terminal to
terminal.
ACM0720, UMC1061, UMC5200 reading should be
indicated as follows:
Terminal A to terminal B ........ 65 – 80 ohms
Terminal B to terminal C ........ 10 – 30 ohms
Terminal A to terminal C ........ 85 – 105 ohms
• Abnormal reading—Infinite or several ohms
©2005 Maytag Services
Disconnect power before performing the following
procedures unless testing requires power.
ACM0860, ACM1120, ACM1420, ACM1460,
ACM2160, MMC5086 reading should be indicated
as follows:
Terminal A to terminal C ........ 85 – 100 ohms
Terminal B to terminal C ....... 10 – 25 ohms
• Abnormal reading—Infinite or several ohms

Turntable Motor

1. Disconnect power to oven and remove turntable
glass.
2. Turn unit on its side and remove turntable motor
cover.
3. Disconnect wire terminals from turntable motor.
4. Measure resistance of turntable motor from terminal
to terminal.
• Normal reading—Approximately 100 – 150 ohms
• Abnormal reading—Infinite or several ohms

High Voltage Capacitor

1. Disconnect power to oven and remove outer case,
(see "Outer Case" section in Disassembly
Procedure).
2. Discharge high voltage capacitor, (see "High Voltage
Capacitor" section in Disassembly Procedure).
3. Disconnect wire leads to high voltage capacitor.
4. Measure resistance of capacitor from terminal to
terminal.
• Normal reading—momentarily indicates several
ohms and then gradually returns to infinite ohms.
• Abnormal reading—Indicates continuity or infinite
ohms.
5. Measure resistance of capacitor from terminal to
case.
• Normal reading—Indicates infinite ohms
• Abnormal reading—Indicates continuity

Humidity Sensor

1. Disconnect power to oven and remove outer case,
(see "Outer Case" section in Disassembly
Procedure).
2. Discharge high voltage capacitor, (see "High Voltage
Capacitor" section in Disassembly Procedure).
3. Disconnect wire terminal plug from control board.
4. Measure the following terminals with meter on
R x 1000 scale.
Normal reading:
Terminal 1 to 2 ............ 718 ohms ...... 5.1 K ohms
Terminal 2 to 3 ............ 718 ohms ...... 2.1 K ohms
Terminal 1 to 3 ............ 5 ohms .......... 2.1 K ohms
Abnormal reading—Infinite or several ohms
NOTE: Unit should be plugged in for at least 5 minutes
before operating sensor cooking. Room
temperature should not exceed 95°F. Oven does
not generate microwave energy for the first 28
seconds of operation.
13
Old Models New Models
16026268

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