Maytag Services ACE5302, P1331307M, UACE5302, P1331308M, DS30E2 Service Manual

International Commercial Microwave—Technical Information

230 V, 50 Hz Models

ACE5302 P1331307M UACE5302 P1331308M
DS30E2 P1331309M UDS30E2 P1331310M
UCA2000NT2 P1331311M

• 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 RS5320016 for installation, operating, testing, troubleshooting, and disassembly
instruction.

All safety information must be followed as provided in Service Manual RS5320016.

!

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

Models ACE5302

Power Source

Voltage AC 230 VAC 230 VAC
Amperage (Single Unit) 16 A 13 A
Frequency 50 Hz 50 Hz
Single Phase, 3 wire grounded X X
Plug CEE 7/7 Schuko BS1363A

Power Output − Microwave

Nominal microwave energy (IEC705) 1000 Watts 1000 Watts
Traditional test method 900 Watts 900 Watts
Minimum temperature rise (∆T) 18ºF / 10ºC 18ºF / 10ºC
Operating Frequency 2450 MHz 2450 MHz

Power Consumption

Microwave only 1800 Watts 1800 Watts
Convection only 2700 Watts 2200 Watts
Combination 3400 Watts 3000 Watts

Dimensions

Cabinet (in / cm)

Width 49 cm (19 1/4") 49 cm (19 1/4")
Height 46 cm (18 1/4") 46 cm (18 1/4")
Depth 67 cm (26 1/4") 67 cm (26 1/4")

Oven Interior (in / cm)

Width 33 cm (13") 33 cm (13")
Height 27 cm (10 1/2") 27 cm (10 1/2")
Depth 38 cm (15") 38 cm (15")

Weight

Crated 46 kg. (102 lbs.) 46 kg. (102 lbs.)
Uncrated 43 kg. (95 lbs.) 43 kg. (95 lbs.)

WARNING

DS30E2

UACE5302

UDS30E2

UCA2000NT2

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©2005 Maytag Services

Component Testing Procedures

!

WARNING

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

Illustration Component Test Results

MT2

MT1 GATE

Triac 1 (top) is for front element
Triac 2 (middle) is for rear element
Triac 3 (bottom) is for microwave

Thermal cutout Disconnect all wires from TCO.

Diode

Triac Disconnect wires to triac.

Capacitor

Snubber assembly Disconnect wires to snubber.

Magnetron

Microwave blower
motor

Measure resistance across terminals.

Control TCO..........................................

Fan TCO...............................................

Magnetron TCO ....................................

Heater Box Limiter ................................

Discharge Capacitor

Remove diode lead from capacitor and
connect ohmmeter.

Reverse leads for second test.

Measure resistance from:

MT1 to MT2 ..........................................

MT1 to Gate..........................................

MT2 to Gate..........................................

All terminals to ground ..........................

Measure voltage from:

MT1 to Gate

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.

Measure resistance across terminals.

Discharge Capacitor

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

Remove all wires from motor.

Measure resistance across coil.

Open at 300°F (149°C) and
closed at 257°F (125°C)
Open at 125°F (52°C) and
closed at 160°F (71°C )
Open at 235°F (113°C) and
closed at 150°F (66°C)
Open at 351°F (177°C) and
closed at or below 18°F (-8°C)
Infinite resistance should be measured
in one direction and 50KΩ or more in
the opposite direction.

NOTE: Ohmmeter must contain a
battery of 6 volts minimum.

Caution - Do not operate oven with
wire to terminal MT2 removed.

Infinite
Approximately 15 Ω, then reverse
meter leads 30 Ω
Infinite
Infinite

0.8 VAC when energized. If no
voltage, check H.V. board and wiring.

Between Terminals: Meter should
momentarily deflect towards zero then
return to over 5 MΩ. If no deflection
occurs, or if continuous deflection
occurs, replace capacitor.

Terminal to Case: Infinite resistance

Infinite

Between Terminals: Less than 1 Ω

Each terminal to ground measures
Infinite resistance.
Note: This test is not conclusive. If
oven does not heat and all other
components test good replace the
magnetron and retest.

Approximately 30 Ω

16025975 March 2005

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©2005 Maytag Services

Component Testing Procedures

4

!

WARNING

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

Illustration Component Test Results

< 1.5 Ω
< 1.5 Ω
Infinite
Infinite
< 1 Ω
Approximately 70 Ω

Infinite
Infinite
Indicates continuity

Indicates continuity
Indicates continuity
Infinite

Approximately 20 Ω

COM

220

6

4

230

7

8

2

3

5

A

Transformer

5

Interlock switch

Door Closed

2

4

7

Convection blower
motor

Secondary

3

Primary

5

Monitor

8

Discharge Capacitor

Remove all wires from terminals.

Measure resistance from:
230 to COM
208 to COM
230 to Ground
208 to Ground
Terminal 5 to 6
Terminal 4 to Ground

Disconnect wires to switch.

With door open measure resistance from:
Terminal 2 to 3
Terminal 4 to 5
Terminal 7 to 8

With door closed measure resistance from:
Terminal 2 to 3
Terminal 4 to 5
Terminal 7 to 8
Remove wires from motor.

Measure resistance across
terminals A and B.

B

Blue

IN OUT

Brown

Blue

Brown

Heating element
assembly

Resistance thermal
device (RTD)

Lamp receptacle Test continuity of receptacle terminals. Indicates continuity with bulb

Line filter

Disconnect wires from terminals.

Measure resistance across heating
element.

Front element 1200 W ......................

Rear element 1500 W ......................

Front element 1100 W ......................

Rear element 1100 W ......................

Temperature

0°C (32°F)...................................................

177°C (350°F) .............................................

Disconnect wire from terminals.
Measure resistance of the following
terminals:

Blue to Blue............................................

Brown to Brown......................................

Indicates continuity

44 Ω
35 Ω

48 Ω
48 Ω

Resistance

1000 Ω

1654 Ω

screwed in.

< 1 Ω

< 1 Ω

March 2005 16025975

©2005 Maytag Services

3

Component Testing Procedures

!

WARNING

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

Illustration Component Test Results

Side touch panel

Top touch panel

Continuity is indicated as 100 Ω and
below.

1

Continuity is indicated as 100 Ω and
below.

Pad

1
2
3
4
5
6
7
8
9
0
Start
Stop/Reset

Pad

Preheat
Time Entry
Temp Entry
Power Level
Stage
Program Save
Hidden Pad

Trace

3 & 5
3 & 6
3 & 7
3 & 8
3 & 9
4 & 5
4 & 6
4 & 7
4 & 8
4 & 9
5 & 6
6 & 9

Trace

3 & 4
5 & 7
7 & 8
5 & 8
5 & 9
6 & 7
8 & 9

Measurement

Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity

Measurement

Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity

1

Wire harness High voltage board

to display module
harness

Display board

Test continuity of wires. Indicates continuity

Interlock

Pin 1

Connector

Side
Touch
Panel

Pin 1

Pin 1

Connector

J5

3.5 VAC should be indicated whenever the oven is plugged into a power supply.

If voltage is present and no display is indicated, replace display board.
If no voltage is present, check wire harness connections and H.V. board.

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J1

H.V. board
Connector

Top

J6

J4

Pin 1

Touch
Panel
Connector

4

©2005 Maytag Services

Component Testing Procedures

!

WARNING

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

H.V. board

Pin 1

Pin 1

Clip

J4

J3

E6

E7

Pin 1

J7

Clip

Pin 50

J5

Pin 1

Pin 28

J6

Pin 1

Clip

J8

Pin 1

Clip

E5

E4

J2

Pin 1

Clip

Pin 1

J1

E3

E2

Clip

E1

Clip

In straight convection mode, both elements operate simultaneously.
In combination mode, the rear element will operate simultaneously with either the microwave or front element.

Function Test Set-Up Meter

Probe Placement Results

Setting

Input to H.V. board At H.V. board Volts J1 pin 1 (Black wire)

Line voltage

& J1 pin 2 (Red wire)

Output to display

board

Disconnect
J5 connector

Volts J5 pin 28 &

J5 pin 50

- 24 VDC

Relay Function Test Set-Up Meter

Probe Placement Results

Setting

K1 Cooling fan Disconnect

J2 connector

K2 Convection

motor

Disconnect
J2 connector

K3 Cavity light Disconnect

J2 connector

K4 Heater A

(front)

Disconnect
J3 connector

K7 Microwave Disconnect

J4 connector

K9 Heater B

(rear)

Disconnect
J4 connector

Ohms J1 pin 1 (Black wire)

& J2 pin 4

Ohms J1 pin 1 (Black wire)

& J2 pin 3

Ohms J2 pin 1 &

J2 pin 2

Test mode 5 off – no continuity
Test mode 5 on – < 1 Ω

Test mode 4 off – no continuity
Test mode 4 on – < 1 Ω

Test mode 6 off – no continuity
Test mode 6 on – < 1 Ω

Ohms E4 & J3 pin 3 Test mode 2 off – no continuity

Test mode 2 on – < 1 Ω

Ohms J4 pin 4 &

J4 pin 5

Test mode 3 off – no continuity
Test mode 3 on – < 1 Ω

Ohms E6 & J4 pin 1 Test mode 1 off – no continuity

Test mode 1 on – < 1 Ω

March 2005 16025975

©2005 Maytag Services

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