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Amana Menumaster MRC518SU, Service Manual

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Amana Menumaster MRC518SU Service Manual Download Page 15

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. 

 

©2005 Maytag Services

 16022149 

 

15

Refer to Technical Sheets for specific model information.

 

Illustration Component 

Test 

Results 

 

4

COM

230 V

5

6

 

Transformer 
 

4

COM

230 VAC

5

6

 

Discharge Capacitor 

Remove all wires from terminals. 
 
Measure resistance from: 

230 to COM.............................................
230 to Ground .........................................
Terminal 5 to 6 ........................................
Terminal 4 to Ground ..............................  

 
 
 
 
Less than 1 

Ω

 

Infinite 
Less than 1 

Ω

 

Approximately 65 

Ω

 

 

4

COM

230

220

5

6

 

Transformer 
 

4

COM

230 VAC

5

6

TCO

220 VAC

 

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 ..............................  

 
 
 
 
Less than 1 

Ω

 

Less than 1 

Ω

 

Infinite 
Infinite 
Less than 1 

Ω

 

Approximately 70 

Ω

 

 

7

8

2

4

3

5

 

Interlock switch 
 

Door Closed

2

4

7

3

5

8

Primary

Secondary

Monitor

 

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 ........................................  

 
 
 
Infinite 
Infinite 
Indicates continuity 
 
 
Indicates continuity 
Indicates continuity 
Infinite 

 

 

Lamp receptacle 
(some models) 

Test continuity of receptacle terminals. 

Indicates continuity if bulb is good 
and screwed in. 

 

 

Antenna motor 

Remove all wires from terminals. 
 
Measure resistance from: 
Terminal to terminal ....................................  

 
 
 
Approximately 12K 

Ω

 

 

0

1

2 4 6 8

 

Relay 
 
This relay contains a 
diode in the coil 
circuit. 

Measure resistance from: 

Terminal 0 to terminal 1 (coil) ..................  

0

1

2

4

6

8

 

 
Approximately 6 to 7 M

Ω

 

 

NOTE:

 Analog meter is 

recommended for measurement. 
 

NOTE:

 If using a digital meter it must 

contain a battery of 6 volts minimum. 

 
 

Black

White

Brown

Blue

 

Line filter 
 

 

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

to 

Blue..........................................  

  Black to Brown .......................................  

 
 
 
 
< 1 

Ω

 

< 1 

Ω

 

 

Terminal block 

Visual check. 

Verify fuse holding terminals are not 
damaged. 
Verify terminals are not damaged. 

Refer to Parts Manual 
for proper power cord 
part number. 

Power cord 

Measure resistance of wires. 

Continuity should be indicated on 
each wire. 
Verify polarity and grounding. 

Summary of Contents for Menumaster MRC518SU

Page 1: ...vice procedures done by an unqualified person 16022149 May 2005 C O M M E R C I A L M I C R O W A V E O V E N MENUMASTER R RC520S P1327601M RC518SU P1327602M RC5MCTP P1327603M RC5PHBU P1327606M RC5PHB P1327607M RC5MCSP P1327608M RC5MCSS P1327609M RC5MCTS P1327610M RC5KFT P1327611M RC5MDTS P1327612M MRC518SU P1327613M MRC520S P1327614M RC5MDTM P1327615M RC518SU2 P1331416M RC520S2 P1331417M RC5MCSP2...

Page 2: ...NS RESPONSIBILITY TO REVIEW ALL APPROPRIATE SERVICE INFORMATION BEFORE BEGINNING REPAIRS WARNING To avoid risk of severe personal injury or death disconnect power before working servicing on appliance to avoid electrical shock To locate an authorized servicer please consult your telephone book or the dealer from whom you purchased this product For further assistance please contact Service Support ...

Page 3: ...7 Procedure For Measuring Radiation Leakage 27 Measurement With the Outer Panel Removed 27 Measurement With a Fully Assembled Oven 27 Record Keeping and Notification After Measurement 27 Disassembly Door Handle 28 Door 28 Outer Door 28 Inner Door RingAssembly 28 Hinge 28 Outer Case 29 Back Panel 29 Splatter Shield 29 Top Touch Panel Assembly 29 Side Touch Panel Assembly 29 High Voltage Circuit Boa...

Page 4: ...4 16022149 2005 Maytag Services Important Safety Information ...

Page 5: ... 2005 Maytag Services 16022149 5 Important Safety Information ...

Page 6: ...6 16022149 2005 Maytag Services Important Safety Information ...

Page 7: ... of the equipment compartment Some types of failures will leave a charge in these capacitors and the discharge could cause a reflex action which could make you injure yourself 7 In the area of the transformer capacitor diode and magnetron there is HIGH VOLTAGE When the unit is operating keep this area clean and free of anything which could possibly cause an arc or earthing etc 8 Do not for any rea...

Page 8: ...e and during servicing to avoid possible exposure to excessive microwave energy or electrical shock disconnect power to oven A Do not operate or allow oven to be operated with door open B Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary Interlock operation Proper door closing Seal and sealing surfac...

Page 9: ...charge on back of oven and back wall Radio Interference Microwave oven operation may cause interference to radio television or similar equipment Reduce or eliminate interference by doing the following Clean the door and sealing surfaces of microwave oven according to instructions in Care and Cleaning section Place radio television etc as far as possible from the microwave oven Use a properly insta...

Page 10: ...AC 50 Hz 13 amp power supply Receptacle Plug 230 V 16 AMP Equipment requires a 230 VAC 50 Hz 16 amp power supply Do not use a extension cord If the product power cord is too short have a qualified electrician install a three prong receptacle This unit should be plugged into a separate dedicated 230 VAC 50 Hz power supply If other equipment is on the same circuit an increase in cooking times may be...

Page 11: ...P CONDITION NORMAL Proceed to DISPLAY DIAGNOSTICS 1 No line voltage 2 Inoperative power cord 3 Inoperative fuse 4 Inoperative display board 5 Inoperative H V board 6 Broken or loose wire connection NO Power Up Error Code Appears STG COOK PREHEAT STANDBY ITEM POWER C M 1 2 3 4 QTY LEVEL NOT READY LMT YES YES ...

Page 12: ...b Inoperative light socket Inoperative auto transformer Broken or improper wire connections 1 2 3 4 Inoperative antenna motor Binding gears Inoperative auto transformer Broken or improper wire connections 1 2 4 Inoperative interlock switch assembly primary Inoperative H V board Broken or improper wire connections 1 2 3 NO Inoperative H V board 5 NO NO NO Yes Yes 3 STG COOK PREHEAT STANDBY ITEM POW...

Page 13: ...perative high voltage transformer 4 Oven is operating properly NOTE Shut down after cook cycle door closed factory preset at 60 seconds but can be changed with user options Shut down door open approximately 2 minutes Blower shuts down and display indicates door Flashing Broken or improper wire connections 7 Inoperative or misadjusted interlock switch assembly secondary Broken or improper wire conn...

Page 14: ...o Gate All terminals to ground Caution Do not operate oven with wire to terminal MT2 removed Infinite Approximately 60 Ω Infinite Infinite Triac 1 center Triac 2 left Triac 3 right Voltage Check Measure voltage from MT1 to Gate 0 8 VAC when energized If no voltage check H V board and wiring Capacitor Some units may use more then one type of capacitor Refer to Parts Manual for correct capacitor qua...

Page 15: ...asure 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 Infinite Infinite Indicates continuity Indicates continuity Indicates continuity Infinite Lamp receptacle some models Test continuity of receptacle terminals Indicates continuity if bulb is good and screwed in Antenna motor Remove all wires ...

Page 16: ...tinuity Continuity Continuity Continuity Top touch panel Removal of touch panel is required to perform test Continuity is indicated as 100 Ω and below 1 Pad Time Entry Power Level Stage Program Save Quantity Menu Hidden Pad Trace 5 7 5 8 5 9 6 7 6 8 7 9 8 9 Measurement Continuity Continuity Continuity Continuity Continuity Continuity Continuity Display board J1 J5 J6 J4 Pin 1 Pin 1 Pin 1 Pin 1 Sid...

Page 17: ...efer to Technical Sheets for specific model information H V board Pin 1 E1 E2 E3 J5 J1 J2 E4 E5 J3 J4 E7 E6 J7 J6 J8 Pin 28 Pin 1 Pin 1 Pin 1 Pin 1 Pin 1 Pin 1 Pin 1 Pin 50 Function Test Set Up Meter Setting Probe Placement Results Input to H V board At H V board Volts J1 pin 1 Brown wire J1 pin 2 White wire Line voltage Output to display board Disconnect J5 connector blower runs continuously Volt...

Page 18: ...Results K8 Magnetron 1 Top rear at 230 VAC All wires connected to H V board VAC E2 Black wire J4 pin 2 Red wire Test mode 1 off line voltage Test mode 1 on 0 volts K4 Magnetron 2 Top front at 230 VAC All wires connected to H V board VAC E5 Red wire J3 pin 1 Gray wire Test mode 2 off line voltage Test mode 2 on 0 volts K6 Magnetron 3 Bottom at 230 VAC All wires connected to H V board VAC J4 pin 4 B...

Page 19: ...ss testing requires power 2005 Maytag Services 16022149 19 Three Magnetron Models 1 1 1 1 2 2 2 2 3 3 3 3 H V System 1 H V System 2 H V System 3 Top Rear Magnetron Center Transformer Bottom Center Capacitor Diode Center Triac Top Front Magnetron Left Transformer Top Left Capacitor Diode Left Triac Bottom Magnetron Right Transformer Right Capacitor Diode Right Triac ...

Page 20: ...r to oven and discharge capacitor before servicing unless testing requires power 16022149 2005 Maytag Services 20 Two Magnetron Models 1 1 1 1 3 3 3 3 H V System 1 H V System 3 Top Rear Magnetron Left Transformer Top Capacitor Diode Left Triac Bottom Magnetron Right Transformer Bottom Capacitor Diode Right Triac ...

Page 21: ... 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 electromecha...

Page 22: ...ny time or if oven is hot Error Codes During operation the display may show the following service codes NOTE Before scheduling service for any error codes instruct customer to unplug oven for 1 minute reconnect power and retest If unit operates properly no service call is required Display Description Corrective Action Err1 Failed H V Board Replace H V board Err2 Shorted Touch Panel Failed H V Boar...

Page 23: ... check H V components and wiring NOTE Pads will not beep when accessing Service Test Mode Toggles Magnetron 3 Bottom ON OFF Toggles Magnetron 1 Top Rear ON OFF Timer counts up to 62 seconds and unit shuts off If no Amperage check for line voltage at H V transformer primary winding If no voltage check Interlock switch secondary Triac 1 H V board relay K8 if 230 VAC and triac 1 drive voltage T1 G Wi...

Page 24: ...on STG ITEM POWER C M 1 2 3 4 QTY LMT 5 Toggles Blower Motor Antenna Motor s Cavity Light if applicable ON OFF If no fan operation check Blower motor and wheel Antenna motor Cavity light if applicable H V board relay K1 230 V Wiring Pressing 0 will clear CALL SERVICE display NOT ACTIVE This mode is NOT active with these models CALL is displayed for 1 second SErv is displayed for 1 second Then the ...

Page 25: ...rent if high voltage is applied R F Capacitors May short to chassis This condition will also cause loss of high voltage 2 Open Heater Filament Can be determined by a ohmmeter when transformer leads are disconnected Resistance is normally less than one ohm filament does not short internally Any tube removed should be checked since usage tends to make the filament more fragile Later handling and shi...

Page 26: ...means of selection either 0 2 or 0 10 and 0 100 on the Holaday Instruments sensitivity ranges Test probe must be held by the grip portion of the handle otherwise a false reading may result if operators hand is between the handle and probe If oven is likely to have a large amount of leakage approach oven slowly with the probe while observing meter This is achieved by holding the probe two or three ...

Page 27: ...for a fully assembled oven before the latch switch primary is interrupted while pulling the door 4 mW cm2 or less 1 Pour 275 cc 15 cc 9 oz 1 2 oz of 20 C 5 C 68 F 9 F water in a beaker which is graduated to 600 cc and place the beaker in the center of oven 2 Set the radiation monitor to 2450 MHz and use it following the manufacturer s recommended test procedure to assure correct results 3 While me...

Page 28: ... reinstalling hinge mounting screws keep the side screws loose and the front screws tight close door press door against oven on the hinge side and tighten side hinge mounting screws in the sequence shown below 1 2 3 4 Door Handle Remove door handle by removing plactic plugs to gain access to set screws Loosen set screws 3 32 inch allen screws one located to the left of the door handle and one loca...

Page 29: ...ly 1 See Component Location Figure 1 for location 2 Remove outer case 3 Disconnect wire connectors at display board 4 Remove screws securing top touch panel to unit 5 Remove screws securing display board to top touch panel assembly 6 Disconnect touch panel connector from display board 7 Reassemble touch panel in reverse order Side Touch Panel Assembly 1 See Component Location Figure 1 for location...

Page 30: ...stalling magnetron Bottom Magnetron 1 See Component Location Figure 2 for location 2 Remove outer case and back panel 3 Remove wires from TCO and magnetron 4 Remove screws securing bottom exhaust duct to cavity bottom 5 Lay oven on it s left side 6 Remove bottom access panel 7 Remove magnetron mounting nuts 8 Remove magnetron and exhaust duct 9 When replacing magnetron verify wire mesh gasket is r...

Page 31: ...y wall Transformer 1 See Component Location Figure 3 for location 2 Remove outer case and back panel 3 Remove screws securing transformer to chassis 4 Pry upward and back to release transformer from chassis 5 Remove wire connections from transformer NOTE When placing transformer back into chassis Front portion of transformer must slide into base pan tabs 6 Reassemble transformer in reverse order A...

Page 32: ...rom plastic gear 5 While supporting antenna carefully pry gear from antenna shaft 6 Remove nylon washer from antenna shaft 7 Remove antenna from oven cavity NOTE Important items when re installing antenna Place nylon washer between gear and cavity Antenna Motors 1 Remove outer case from oven 2 Remove wires connected to antenna motor 3 Remove screws securing motor assembly to cavity 4 Remove motor ...

Page 33: ...er Relay 1 Remove outer case from oven 2 Disconnect and label wire terminals to relay 3 Remove screws securing relay to back of oven cavity 4 Reassemble in reverse order Line Filter 1 Remove outer case from oven 2 Disconnect and label wire terminals to line filter 3 Remove screws securing line filter to back of oven cavity 4 Reassemble in reverse order Replacing Oven Light Bulb WARNING To avoid el...

Page 34: ...d discharge capacitors before following any disassembly procedure WARNING 34 16022149 2005 Maytag Services Component Location Figure 1 Touch Panel Top Touch Panel Side Display Module Interlock Switch Assembly Antennas Top front antenna on 3 tube ovens are blue tipped All other antennas are plain tipped ...

Page 35: ...t power to oven and discharge capacitors before following any disassembly procedure WARNING 2005 Maytag Services 16022149 35 Figure 2 Filter Magnetrons Magnetron TCO s Splatter Shield Oven Tray Bottom Exhaust Duct Top Exhaust Duct Bottom Flow Divider Top Flow Divider Rear Flow Divider ...

Page 36: ... power to oven and discharge capacitors before following any disassembly procedure WARNING 36 16022149 2005 Maytag Services Figure 3 Auto Transformer Fan Blade Capacitor Transformer High Voltage Board Back Panel Triac Oven Light Socket Terminal Block Fuse Block and Fuse Fan Motor Relay ...

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