Relay; Oven Thermostat; Fuse - Maytag ACM0720AB Service Manual

Testing Procedures
!
WARNING

Relay

1. Disconnect power to oven and remove control panel,
(see "Control Panel" 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
relay (RY2), and connect meter leads to terminals
shown below on R x 1 scale and operate the unit.
Power Level Cycles On for:
1 4 seconds
2 6 seconds
3 8 seconds
4 10 seconds
5 12 seconds
6 14 seconds
7 16 seconds
8 18 seconds
9 20 seconds
10 22 seconds
16026268
Rela y 2
Cycles Off for:
18 seconds
16 seconds
14 seconds
12 seconds
10 seconds
8 seconds
6 seconds
4 seconds
2 seconds
0 seconds
Disconnect power before performing the following
procedures unless testing requires power.

Oven Thermostat

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).
3. Remove outer case, (see "Outer Case" section).
4. Remove screws securing air duct to oven cavity.
5. Disconnect wires from oven thermostat.
6. Measure resistance from terminal to terminal. Meter
should read approximately 0.5 ohms. Any other
indication replace oven thermostat.
Listed below are temperature settings for the thermostat.
Unit
ACM0720
ACM0860
ACM1120
ACM1420
ACM1460
ACM2160
MMC5086
UMC1061
UMC5200

Fuse

NOTE:
Before replacing a blown monitor fuse, test the
primary interlock switch, secondary interlock switch,
monitor switch, and power relay contacts for proper
operation. If the monitor fuse is blown by a failed
switch operation, all switches and printed circuit board
must be replaced.
Problem:
• Fuse blows immediately after oven door is opened or
closed.
Improper operation of primary, secondary and/or
monitor switches
• Fuse blows when oven door is closed and START pad
is pressed.
Malfunction of the high voltage transformer, high
voltage capacitor including the diode, magnetron,
blower motor or circuit board.
14
Open Closed
230°F 140°F
194°F 167°F
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