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Maytag Services AMV4204AAB, Technical Information, Page: 2 / 9

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Component Testing Procedures 

 

!

WARNING

 

To avoid risk of electrical shock, personal injury or death; disconnect power to oven before servicing, unless  
testing requires power. 

16026270  

June 

2005 

 

 

©2005 Maytag Services 

2

 

Illustration Component 

Test 

Procedure 

Results 

 

High voltage 
transformer 

Primary

Secondary

Filament

0 V

120 V

 

 

Discharge Capacitor

 

Disconnect connector and measure 
continuity with meter on R x 1 scale: 
 Secondary ......................................
 Filament..........................................
 

Primary (High & Low)......................

(Measure at room temperature, or 70° F/ 
22°C) 
Measure continuity with meter on “High” 
scale:  Primary winding to ground ..............
 

Filament winding to ground.............

 
 
 
Approximately 50-120 

Ω

 

Less than 1 

Ω

 

Less than 1 

Ω

 

 
 

 

Infinite 

Ω

 

Infinite 

Ω

 

 

Magnetron 

Discharge Capacitor

 

 
Remove wires from magnetron and 
connect ohmmeter to terminals. Also 
check between each terminal and ground. 

 

Between Terminals:

 Less than 1 

Ω

 

Each terminal to ground

: Infinite 

resistance. 

Note:

 This test is not conclusive. If 

oven does not heat and all other 
components test good replace the 
magnetron and retest. 

 

High Voltage 
Capacitor 

Discharge Capacitor

 

Remove wires from capacitor terminals 
and connect ohmmeter, set on highest 
resistance scale to terminals. 
 
Also check between each terminal and 
capacitor case. 

 

Between Terminals:

 Meter should 

momentarily indicate several ohms, 
then return to infinity. If no deflection 
occurs, or if continuous deflection 
occurs, replace capacitor. 

Terminal to Case:

 Infinite resistance 

 

High Voltage Diode 

Discharge Capacitor

 

 
Remove diode lead from capacitor and 
connect ohmmeter. 
 
Reverse leads for second test. 

 
Infinite resistance should be measured 
in one direction and continuity in the 
opposite direction. 

NOTE:

 Ohmmeter must contain a 

battery of 6 volts minimum. 

Power Level 

Cycle On 

(Continuity) 

Cycle Off 

(Open) 

1 

4 sec 

18 sec 

2 

6 sec 

16 sec 

3 

8 sec 

14 sec 

4 

10 sec 

12 sec 

5 

12 sec 

10 sec 

6 

14 sec 

8 sec 

7 

16 sec 

6 sec 

8 

18 sec 

4 sec 

9 

20 sec 

2 sec 

 

 

Relay 7 

 

 
 

 

Disconnect the leads.  Place water in the 
oven and select power levels 1 through 
10.  Check continuity between the 
terminals of the relays. 

10 

22 sec 

0 sec 

Summary of Contents for AMV4204AAB

Page 1: ...ersonal injury or death disconnect power to oven before servicing unless testing requires power Power Source AMV4204AA MMV4205AA Voltage AC 120 VAC 120 VAC Amperage 20 A 20 A Frequency 60 Hz 60 Hz Single Phase 3 wire grounded Yes Yes Power Output Nominal microwave energy IEC705 1150 Watts 1150 Watts Operating frequency 2450 MHz 2450 MHz Power Consumption Microwave lamp and vent fan 1700 Watts 1700...

Page 2: ...ven does not heat and all other components test good replace the magnetron and retest High Voltage Capacitor Discharge Capacitor Remove wires from capacitor terminals and connect ohmmeter set on highest resistance scale to terminals Also check between each terminal and capacitor case Between Terminals Meter should momentarily indicate several ohms then return to infinity If no deflection occurs or...

Page 3: ... Oven Thermal Cut Out Thermostat Disconnect all wires from TCO Measure resistance across terminals Oven TCO Open at 230 F 110 C Closed at 0 F 32 C Lamp receptacle Test continuity of receptacle terminals Indicates continuity if bulb is good and installed Turntable Drive Motor Synchronous motor Measure voltage across terminals Measure resistance across terminals Approximately 120 VAC Approximately 2...

Page 4: ...Auto Defrost Time Defrost Rapid Defrost Clock Cook Time Control Setup Power Level Add 30 Sec Hold Warm Stop Clear Enter Start Custom Program Kitchen Timer Light Timer Vent Hi Lo Off Turntable On Off Light Hi Lo Off Trace 8 1 8 2 8 3 8 4 8 5 8 6 8 7 13 5 13 6 13 7 11 1 9 6 9 7 11 2 11 3 10 4 10 6 10 7 11 4 11 6 11 7 12 5 9 2 12 1 13 1 11 5 12 2 13 3 13 4 9 3 12 4 9 5 10 1 12 3 10 3 Measurement Cont...

Page 5: ...Defrost Rapid Defrost Clock Cook Time Control Setup Power Level Add 30 Sec Hold Warm Stop Clear Enter Start Custom Program Kitchen Timer Light Timer Vent Hi Lo Off Vent Auto Time Set Turntable On Off Light Hi Lo Off Trace 8 1 8 2 8 3 8 4 8 5 8 6 8 7 13 5 13 6 13 7 11 1 9 6 9 7 11 2 11 3 10 4 10 6 10 7 11 4 11 6 11 7 12 5 9 2 12 1 13 1 11 5 12 2 13 3 13 4 9 3 12 4 9 5 10 1 10 5 12 3 10 3 Measuremen...

Page 6: ... Temperature Chart below NOTES The IEC 705 test method requires precision measurements and equipment It is not practical to perform the IEC test in the field To convert the traditional power test results to the approximate IEC 705 rating take the traditional power test results and add 100 watts per magnetron for the unit being tested Example 1050 watts output using the traditional power test 100 w...

Page 7: ...ersonal injury or death disconnect power to oven before servicing unless testing requires power June 2005 16026270 2005 Maytag Services 7 MAGNETRON H V DIODE H V BN H V FA F CAPACITOR BK WH WH WH WH BK RD YL YL BN AMV4204AAB W Q MMV4205AAB W Q S Schematic Diagram Series 10 ...

Page 8: ...rical shock personal injury or death disconnect power to oven before servicing unless testing requires power 16026270 June 2005 2005 Maytag Services 8 AMV4204AAB W Q Schematic Diagram Series 11 WARNING POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE ...

Page 9: ...ical shock personal injury or death disconnect power to oven before servicing unless testing requires power June 2005 16026270 2005 Maytag Services 9 MMV4205AAB W Q S Schematic Diagram Series 11 WARNING POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE ...

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