Maytag UMC5200B Series Manual

Domestic Microwave—Technical Information
May 2006 16027190
© 2006 Maytag Services
1
UMC5200B** JMC5200B** AMC2206B**
•Due to possibility of personal injury or property damage, always contact an authorized technician for servicing or
repair of this unit.
•Refer to Service Manual 16022923 for detailed installation, operating, testing, troubleshooting, and disassembly
instructions.
CAUTION
!
All safety information must be followed as provided in Service Manual 16022923.
!WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
Model UMC5200B** JMC5200B** AMC2206B**
Power Source
Voltage AC 120 VAC 120 VAC 120 VAC
Amperage 30 A 30 A 30 A
Frequency 60 Hz 60 Hz 60 Hz
Single Phase, 3 wire grounded Yes Yes Yes
Power Output
Nominal microwave energy (IEC705) 1100 Watts 1100 Watts 1100 Watts
Operating frequency 2450 MHz 2450 MHz 2450 MHz
Power Consumption
Magnetron only 1100 Watts 1100 Watts 1100 Watts
Dimensions, Exterior (Cabinet)
Width 23.7" 60 cm 23.7" 60 cm 23.7" 60 cm
Height 13.3" 33 cm 13.3" 33 cm 13.3" 33 cm
Depth 18.2" 46 cm 18.2" 46 cm 18.2" 46 cm
Dimensions, Interior (Cavity)
Width 17.4" 44 cm 17.4" 44 cm 17.4" 44 cm
Height 10.9" 28 cm 10.9" 28 cm 10.9" 28 cm
Depth 17.9" 45 cm 17.9" 45 cm 17.9" 45 cm
Weight
Uncrated 41.4 lbs (approx.) 41.4 lbs (approx.) 41.4 lbs (approx.)
Crated 45.2 lbs (approx.) 45.2 lbs (approx.) 45.2 lbs (approx.)

Component Testing Procedures
!WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
16027190 May 2006
© 2006 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:
Secondary.....................................
Filament ........................................
Primary..........................................
(Measure at room temperature, or 70° F.)
Approximately 115-120 Ω.
Measures continuity.
Less than 1 Ω.
Low voltage
transformer
1
2
3
9
6
7
8
5
4
Discharge Capacitor
Remove from printed circuit board
assembly and check continuity:
Terminals 1-4 (Input).................................
Terminals 6-8 (Output 12.6 VAC)..............
Approximately 237-247 Ω.
Approximately 7.6 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 deflect towards zero then
return to over 5M Ω. 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 50K Ωor more in
the opposite direction.
NOTE: Ohmmeter must contain a
battery of 6 volts minimum.
Main Relay/Power
Control Relay
Disconnect the leads. Place water in the
oven and set the power level to HIGH.
Press START, then check continuity
between the terminals of the relays ..........
Continuity.
Primary Interlock
Switch Test
(Top Switch)
1
2
Measure resistance between
terminals 1 and 2:
Door Open.................................................
.
Door Closed ..............................................
.
Open.
Continuity.
Secondary Interlock
Switch Test
(Bottom Switch)
2
1
Measure resistance between
terminals 1 and 2:
Door Open.................................................
Door Closed ..............................................
Open.
Continuity.

Component Testing Procedures
!WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
May 2006 16027190
© 2006 Maytag Services
3
Illustration Component Test Procedure Results
Interlock Monitor
Switch Test
(Middle Switch)
1
2
Measure resistance between
terminals 1 and 2:
Door Open ......................................
.
Door Closed....................................
.
Continuity.
Open.
Thermal cutout Disconnect all wires from TCO.
Measure resistance across
terminals.
Magnetron TCO ..............................
.
Open at 194° F (90° C) and closed at
140° F (60° C).
Lamp receptacle Test continuity of receptacle
terminals .........................................
.
Indicates continuity if known good bulb is
inserted.
Fan motor Remove all wires from motor.
Measure resistance across coil ......
.
Approximately 50 Ω(77° F, 25° C).
Less than 44 Ωor more than 57 Ω(70° F,
20° C), motor is defective.
Turntable Drive
Motor
Measure across terminals
Voltage ...........................................
.
Resistance......................................
.
Approximately 20 VAC.
Approximately 120 Ω.
Pin 1
Touch Pad/Control
Panel Model
Removal of Touch Pad/Control
Panel is required to perform test.
Check for continuity.
Pad
1
2
3
4
5
6
7
8
9
0
Vegetables
Cook
Pizza Slice
Baked Potato
Popcorn
Option
Add 30 Seconds
Reheat
Control Setup
Kitchen Timer
Custom
Program
Auto Defrost
Enter/Start
Snacks
Kids Meals
Soften/Melt
Clock
Power Level
Stop/Clear
Trace
16 & 8
16 & 7
16 & 6
16 & 5
16 & 4
16 & 3
15 & 9
15 & 8
15 & 7
16 & 9
10 & 8
10 & 9
11 & 3
12 & 6
12 & 7
13 & 2
13 & 4
13 & 5
13 & 7
13 & 9
14 & 3
14 & 4
14 & 5
14 & 6
14 & 7
14 & 8
14 & 9
15 & 3
15 & 4
Measurement
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity

Component Testing Procedures
!WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
16027190 May 2006
© 2006 Maytag Services
4
Power Test (Traditional Test Method)
Test equipment required is Amana power test kit R0157397 (Fahrenheit), or
Menumaster power test kit M95D5 (Celsius).
1. Fill the plastic container to the 1000 ml. line with cool tap water.
2. Using the thermometer; stir the water, measure, and record the water temperature.
Initial water temperature should be approximately 60° F (16° C).
3. Place container on the center of the oven shelf and heat the water for
33 seconds for ovens with more than 1550 watts or 63 seconds for ovens with less than 1550 watts.
NOTE: Use a watch second hand, not the oven timer.
4. Stir the water, measure and record the temperature of the water after heating time is complete.
5. Subtract the starting water temperature (Step 2), from the ending water temperature (Step 4) to obtain the
temperature rise (∆T).
6. See the Traditional Power Test 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: 800 watts output using the traditional power test
+ 100 watts (1 magnetron X 100 watts)
900 Approximate IEC-705 results
•Always perform power test three times for accuracy, changing the water after each test is performed.
•Variation or errors in the test procedure will cause a variance in the temperature rise. Additional power
tests should be made if temperature rise appears marginal.
•Low line voltage will cause lower temperature rise.
Traditional Power Test Temperature Chart
SIXTY-THREE (63) SECONDS run time chart for units less than 1550 Watts cooking power
Fahrenheit Celsius
∆T Cooking ∆T Cooking ∆T Cooking ∆T Cooking
(°F) Power Output (°F) Power Output (°C) Power Output (°C) Power Output
16 620 23 891 7 490 15 1050
17 659 24 930 8 560 16 1120
18 697 25 969 9 630 17 1190
19 736 26 1007 10 700 18 1260
20 775 27 1046 11 770 19 1330
21 814 28 1085 12 840 20 1400
22 852 29 1124 13 910 21 1470
14 980 22 1540

Wiring Diagram and Schematic
!WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
May 2006 16027190
© 2006 Maytag Services
5
RED
RED
BRN
BLK
FA F
HIGH VOLTAGE
TRANSFORMER
H.V.FUSE
H I GH VO L T AG E CA P A CI TO R
HIGH VOLTAGE
DIODE
TOCHASSIS
MAGNETRON
SYMBOL COLOR
ORG ORANGE
BRN BROWN
RED RED
BLU BLUE
RED
RED
Schematic Diagram