Danger MFS12TS, RFS12TSW, RFS12TS Technical Information

Commercial Microwave—Technical Information

120 V, 60 Hz Models

RFS12TS P2001002M RFS12TSW P2001001M MFS12TS P2001007M

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

CAUTION

!

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

!

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

Models RFS12TS,

Power Source

Voltage AC 120 VAC Amperage (Single Unit) 20 A Frequency 60 Hz Single Phase, 3 wire grounded X Receptacle 5-20R Plug 5-20P

Power Output

Nominal microwave energy (IEC705) 1200 Watts Minimum temperature rise (∆T) 12ºF / 6.5ºC Operating Frequency 2450 MHz

Power Consumption

Cook Condition Microwave 1800 Watts / 15.8 Amps

Dimensions

Cabinet

Width 21 3/4" 55 cm Height 14 1/4" 36.2 cm Depth 20 1/4" 51.4 cm

Oven Interior

Width 14 1/4" 36.2 cm Height 9" 22.6 cm Depth 16 3/8" 41.6 cm

Weight

Crated 71 lbs. 32 kg Uncrated 64 lbs. 29 kg

WARNING

RFS12TSW,MFS12TS

October 2013 1 16500023

Component Testing Procedures

Filament

Secondary

!

WARNING

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

Illustration Component Testing Results

Thermal cutout Disconnect all wires from TCO.

Diode

Capacitor

Magnetron

Blower motor Remove all wires from motor.

Measure resistance across terminals.

Cavity TCO ...........................................

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

Discharge Capacitor

Remove diode lead from capacitor and connect ohmmeter.

Reverse leads for second test. 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 wires from magnetron and connect ohmmeter to terminals. Also check between each terminal and ground.

Measure resistance across coil .............

Opens at 230°F (110°C)

Closed at 140°F (60°C) and Opens at 320°F (160°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.

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 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 28 – 35 Ω

Primary

Stirrer motor Remove all wires from motor.

Transformer

Noise filter board Power In terminals ................................

Circuit Protector Measure resistance across terminals ....

16500023 October 2013

Measure resistance across terminals ....

Discharge Capacitor

Remove all wires from terminals.

Measure resistance from:

Primary ................................................

Filament ...............................................

Secondary to Ground screw on

transformer stack .................................

Power Out terminals..............................

2

Approximately 12 – 14 KΩ

Less than <1 Ω Less than <1

Approximately 90-100 Ω 120 VAC 120 VAC If no power in, check power outlet. If no power out, check fuses. Between Terminals: Less than 1 Ω

Ω

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 it.

Illustration Component Testing Results

Interlock switch assembly

Disconnect wires to switch.

With door open measure resistance from:

Top Monitor – COM (PK) – NO (BL) .......

Btm Monitor – COM (WH) – NO (RD) .....

Top Primary – COM (RD BK) – NC (BN)

Btm Primary – COM (BK) – NC (BL) .......

Secondary – COM (PK) – NC (GN) .......

With door closed measure resistance from:

Top Monitor – COM (PK) – NO (BL) ......

Btm Monitor – COM (WH) – NO (RD) .....

Top Primary – COM (RD BK) – NC (BN)

Btm Primary – COM (BK) – NC (BL) .......

Secondary – COM (PK) – NC (GN) .......

Indicates continuity Indicates continuity Infinite Ω Infinite Ω Infinite Ω

Infinite Ω Infinite Ω Indicates continuity Indicates continuity Indicates continuity

After verifying or replacing the module, reconnect wires to switch and check operation of monitor circuit before operating the oven.

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

Wire Harness Test continuity of wires Indicates continuity

installed.

Electronic Control Panel

Service Test Mode: Open door, Press and Hold pad 3 for 5

Error codes: E-08 ............................................................

seconds to enter service test mode.

Press Pad 1 ................................................

Press Pad 2 ................................................

Press Pad 3 ................................................

Press Pad 4 ................................................

Press Pad 5 ................................................

Press Pad 6 ................................................

Press Pad 7 ................................................

Press Pad 8 ................................................

Press Pad 9 ................................................

Press Pad 0 ................................................

Stop/Reset Pad ...........................................

E-09 ............................................................

E-10 ............................................................

SERVICE appears in the display

Indicates number of hours

magnetron has been turned on Indicates number of times magnetron tube has been turned on and off Indicates number of door cycles CLEAR (Press START pad to

reset service data.) Indicates amperage (Top Mag) Indicates amperage (Bottom Mag)

RESET (Clear Service Alarm) N/A N/A N/A Exit Service Test Mode Replace Control Board Replace Control Board Shorted or Open Keypad – Test and replace if necessary

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Component Testing Procedures

TAB 1

TAB 2

RLY 3

C 1

1

2

!

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

WARNING

8

N

Function Test Set-Up /

Condition

Power to current transformer Power from current transformer

Power from Oven TCO All Conditions Volts CN1 – Pin 1 (Black wire to Neutral) 120 VAC

Power to Oven Light Standby .............

Power to Blower Motor Standby .............

Secondary Interlock Switch

Power to Relay 3 Standby .............

All Conditions Volts Tab 1 to CN1 Pin 3 (Neutral) 120 VAC

All Conditions Volts Tab 2 to CN1 Pin 3 (Neutral) 120 VAC

Ready ................

Cook ..................

Ready ................

Cook ..................

Door Closed ......

Door Opened .....

Ready ................

Cook ..................

3

5 4

Meter Setting

Volts Volts Volts Volts Volts Volts Ohms Ohms

Volts Volts Volts

19

Probe Placement Results

CN1 – Pin 4 to Pin 1 ..............................

CN1 – Pin 5 to Pin 1 ..............................

CN1 – Pin 8 to Pin 9 ..............................

Relay 3 – Pin 1 to Pin 2 .........................

120 VAC 0 VAC 0 VAC 120 VAC 0 VAC 0 VAC Continuity Infinite

120 VAC 120 VAC 0 VAC

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Component Testing Procedures

!

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

All Amana and Menumaster microwave oven power outputs are rated using the IEC705 standards. Using the IEC705 test method requires precision measurements and equipment that is not practical to be performed in the field. Using the test shown below will indicate if the oven performance is satisfactory.

WARNING

Test equipment required:

• 1000 ml test container and thermometer.

• Digital watch / watch with a second hand for use on ovens with electromechanical timers.

Important Notes:

• Low line voltage will cause low temperature rise / power output.

• Ovens must be on a dedicated circuit, properly grounded, and polarized. Other equipment on the same

circuit may cause a low temperature rise / power output.

• This test and results are not a true IEC705 test procedures and are only intended to provide servicers with an easy means of determining if the microwave oven cooking output is correct.

Procedure

1. Fill the test container to the 1000 ml line with cool tap water.

NOTE: Water temperature should be approximately 60°F / 16°C

2. Using the thermometer, stir water for five to ten seconds; measure, and record the temperature (T1).

3. Place test container of water in the center of oven cavity and close door.

4. Heat the water for a 33-second full power cycle.

NOTE: Use a digital watch or a watch with a second hand for ovens with electromechanical timers.

5. At end of the cycle, remove test container. Using the thermometer, stir water for five to ten seconds and record temperature (T2).

6. Subtract the starting water temperature (T1), from the ending water temperature (T2) to obtain the temperature rise (∆T).

7. If the temperature rise (∆T) meets or exceeds the minimum, the test is complete. If the temperature rise (∆T) fails to meet the minimum temperature rise, test the line voltage to verify it is correct. Then repeat steps 1 - 6 making sure to change the water. If the temperature rise (∆T) fails to meet the minimum temperature rise again the oven will require service.

Minimum Temperature Rise at Thirty -Three (33) Seconds Run Time

∆T Cooking ∆T Cooking ∆T Cooking ∆T Cooking (°F) Power Output (°F) Power Output (°C) Power Output (°C) Power Output

10.................. 1000 20 ................. 2000 5 ............... 1000 11 ............ 2000

11.................. 1100 21 ................. 2100 5.5 ............. 1100 11.5 ......... 2100

12.................. 1200 22 ................. 2200 6.5 ............. 1200 12 ............ 2200

14.................. 1400 24 ................. 2400 7.5 ............. 1400 13 ............ 2400

17.................. 1700 25 ................. 2500 9.5 ............. 1700 13.5 ......... 2500

18.................. 1800 27 ................. 2700 10 .............. 1800 15 ............ 2700

19.................. 1900 30 ................. 3000 10.5 ........... 1900 16.5 ......... 3000

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Wiring and Schematic Diagrams

BTM PRIMARY INTERLOCK SWITCH

TAB 1

TAB 2

DANGER

!

HIGH VOLTAGE

!

WARNING

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

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Danger MFS12TS, RFS12TSW, RFS12TS Technical Information

Specifications and Main Features

Frequently Asked Questions

User Manual