Testing Procedures - Maytag UMV1152BAB/W/Q/S Service

Testing Procedures

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge the high voltage
capacitor before servicing, unless testing requires power.
Illustration
High voltage
transformer
120 V
Primary
UMV1152B**,
MMV1153A**,
AMV1162A**,
AMV5164A**
High voltage
transformer
120 V
Primary
AMV4204A**,
MMV4205A**,
MMV5165A**,
AMV5206A**,
MMV5207A**,
JMV8208A**
Magnetron
All Models
High Voltage
Capacitor
All Models
High Voltage Diode
All Models
UMV1152B**,
MMV1153A**,
AMV1162A**
18
!
Component
Discharge Capacitor
Disconnect connector and measure
continuity with meter on R x 1 scale:
Secondary
Filament
(Measure at room temperature, or 70° F/
0 V
22°C)
Measure continuity with meter on "High"
scale: Primary winding to ground ............
Discharge Capacitor
Disconnect connector and measure
continuity with meter on R x 1 scale:
Secondary
Filament
(Measure at room temperature, or 70° F/
0 V
22°C)
Measure continuity with meter on "High"
scale: Primary winding to ground ............
Discharge Capacitor
Remove wires from magnetron and
connect ohmmeter to terminals. Also
check between each terminal and ground.
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.
Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Relay 2 Disconnect the leads. Place water in the
oven and select power levels 1 through
10. Check continuity between the
terminals of the relays.
16023056 Rev. 0
W ARNING
Test Procedure
Secondary ....................................
Filament........................................
Primary .........................................
Filament winding to ground...........
Secondary ....................................
Filament........................................
Primary (High & Low)....................
Filament winding to ground...........
Results
Approximately 65-120 Ω
Less than 1 Ω
Less than 1 Ω
Infinite Ω
Infinite Ω
Approximately 50-120 Ω
Less than 1 Ω
Less than 1 Ω
Infinite Ω
Infinite Ω
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.
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
Infinite resistance should be measured
in one direction and continuity in the
opposite direction.
NOTE: Ohmmeter must contain a
battery of 6 volts minimum.
Cycle On
Power Level
(Continuity)
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
10 22 sec 0 sec
©2004 Maytag Services
Cycle Off
(Open)