Maytag ACO1520AC, ACO1840AC High Voltage Capacitor, High Voltage Diode, Humidity Sensor, Relay

Testing Procedures

!WARNING

Disconnect power before performing the following procedures unless testing requires it.

4.Measure resistance of the terminals on the high voltage transformer with meter on R x 1 scale.

Reading should be indicated as follows: Primary winding ......less than 1.0 ohms Filament winding ....less than 1.0 ohms Secondary winding . approximately 50 to 120 ohms

5.Measure resistance of the terminals on the high voltage transformer with meter on high scale.

Reading should be indicated as follows: Primary winding to ground ....... Infinite ohms Filament winding to ground ..... Infinite ohms

High Voltage Capacitor

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 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

High Voltage Diode

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 leads to high voltage diode.

4.Measure resistance of diode in forward bias.

•Normal reading—Indicates continuity

•Abnormal reading—Indicates infinite ohms

5.Measure resistance of diode in reverse bias.

•Normal reading—Indicates infinite ohms

•Abnormal reading—Indicates continuity

Humidity Sensor

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 (CN5).

4.Measure the following terminals with meter on R x 1000 scale.

Normal indication:

Terminal 1 to terminal 2 ......... 4.5K to 6.2K ohms Terminal 2 to terminal 3 ........ 2.0K to 3.5K ohms Terminal 1 to terminal 3 ........ 2.0K to 3.5K ohms

Abnormal indication: Infinite or several ohms

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 (ACO18*, RY2) (ACO15*, RY7), and operate the unit.

Relay 2

Power Level	Cycles On for:	Cycles Off for:
1	4 seconds	18 seconds
2	6 seconds	16 seconds
3	8 seconds	14 seconds
4	10 seconds	12 seconds
5	12 seconds	10 seconds
6	14 seconds	8 seconds
7	16 seconds	6 seconds
8	18 seconds	4 seconds
9	20 seconds	2 seconds
10	22 seconds	0 seconds

Control Key Panel

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).

16021668 Rev. 0 10 ©2002 Maytag Appliances Company