Amana Menumaster RC518U2 Service Manual

Service

This manual is to be used by qualified appliance technicians only. Maytag does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualified person.

International Countertop

MENUMASTER

C O M M E R C I A L M I C R O W A V E O V E N

This Base Manual covers general information.

Refer to individual Technical Sheet

for information on specific models.

This manual includes, but is

not limited to the following:

Commercial Microwave Ovens

RC5PHBU2 P1331421M RC5PHB2 P1331422M RC520T2 P1331423M RC5KFT2 P1331424M RC5MCTP2 P1331425M RC5MCTS2 P1331426M RC5MDTS2 P1331427M RC5MDTM2 P1331428M

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 P1331418M RC518U2 P1331419M MRC520S2 P1331420M

16022149

May 2005

Important Information

Important Notices for Servicers and Consumers

Maytag will not be responsible for personal injury or property damage from improper service procedures. Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service. Products should be serviced only by a qualified service technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing instruments and the appropriate service information. IT IS THE TECHNICIANS RESPONSIBILITY TO REVIEW ALL

APPROPRIATE SERVICE INFORMATION BEFORE BEGINNING REPAIRS.

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:

WARNING

Service Support Center

Contact your local product distributor or vist the Web site at www.amanacommercial.com.

Recognize Safety Symbols, Words, and Labels

DANGER!

DANGER—Immediate hazards which WILL result in severe personal injury or death.

WARNING!

WARNING—Hazards or unsafe practices which COULD result in severe personal injury or death.

CAUTION!

CAUTION—Hazards or unsafe practices which COULD result in minor personal injury, product or property

damage.

Table of Contents

Important Information .................................................... 2

Important Safety Information ......................................... 4

Wiring .....................................................................8

Earthing Instructions............................................... 8

Servicing of Earthing Products ................................ 8

General Information

Unpacking Oven ..................................................... 9

Oven Placement ..................................................... 9

Radio Interference ...................................................9

Earthing Instructions............................................... 9

Microwave Oven Description ................................. 10

Troubleshooting

Power up .............................................................. 11

Standby Condition ................................................ 12

Cook Condition ..................................................... 13

Component Testing Procedures .................................. 14

Power Testing Procedure

Power Test ........................................................... 21

Display Diagnostics

Error Codes .......................................................... 22

Service Test ........................................................... 23-24

Service Information

Proper Handling of Magnetron Tubes .................... 25

Magnetron Failure Modes ..................................... 25

Operating Instructions for the Holaday

HI1501, HI1510, HI1710, and HI1801 .............. 26

Microwave Leakage Test

Equipment ............................................................ 27

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 Ring Assembly .................................... 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 Board ................................... 29

Interlock Switch Module ....................................... 30

Adjustment .................................................... 30

Display Module ..................................................... 30

Top Rear Magnetron ............................................. 30

Top Front Magnetron ............................................. 30

Bottom Magnetron ................................................ 30

Magnetron Cutout (TCO) ....................................... 31

Cavity Thermal Cutout (TCO) ................................ 31

Triacs ................................................................... 31

Capacitor .............................................................. 31

Transformer .......................................................... 31

Auto Transformer .................................................. 31

Microwave Blower Wheel and Motor ..................... 31

Fan Blade .............................................................31

Top Antennas ........................................................ 32

Bottom Antenna.................................................... 32

Antenna Motors .................................................... 32

Oven Tray Removal / Installation ...........................32

Fuse ..................................................................... 33

Power Cord .......................................................... 33

Light Socket .........................................................33

Relay .................................................................... 33

Line Filter ............................................................. 33

Replacing Oven Light Bulb ................................... 33

Component Location ........................................ 34-36

Important Safety Information

CAUTI ON

Read the following information to avoid possible exposure to microwave radiation:

The basic design of the Amana and Menumaster microwave ovens make it an inherently safe device to both user and servicer. However, there are some precautions which should be followed when servicing the microwave oven to maintain this safety. These are as follows:

1. Always operate the unit from an adequately earthed outlet. Do not operate on a two-wire extension cord.

2. Before servicing the unit (if unit is operable), perform the microwave leakage test.

3. The oven should never be operated if the door does not fit properly against the seal, the hinges or hinge bearings are damaged or broken; the choke is damaged, (pieces missing, etc.); or any other visible damage can be noted. Check the choke area to ensure that this area is clean and free of all foreign matter.

4. If the oven operates with the door open and produces microwave energy, take the following steps.

A. Tell the user not to operate the oven. B. Contact Maytag immediately.

5. Always have the oven disconnected when the outer case is removed except when making the "live" tests called for in this Service Manual. Do not reach into the equipment area while the unit is energized. Make all connections for the test and check them for tightness before plugging the cord into the outlet.

6. Always earth the capacitors on the magnetron filter box and H. V. Capacitor with an insulated-handle screwdriver before working in the high voltage area 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 reason defeat the interlock switches. There is no valid reason for this action at any time; nor will it be condoned by Maytag.

9. IMPORTANT: Before returning a microwave to a customer, check for proper switch interlock action. The primary and secondary switches MUST actuate when the door is opened. The monitor switch MUST close at a opened.

10.Before returning a microwave to a customer, verify the door spacing is reasonably uniform along the top, bottom, and sides, and that it measures

/64–inch (0.5 mm) or less.

11. The Amana or Menumaster microwave oven should never be operated with:

• Any components removed and/or bypassed.

• Any of the safety interlocks found to be

defective.

• Any of the seal surfaces defective, missing,

or damaged.

12.To ensure that the unit does not emit excessive microwave leakage and to meet the Department of Health Human Service guidelines, check the oven for microwave leakage using leakage monitor as outlined in the instructions. The maximum leakage level allowed is 4mW/cm2.

13.If servicer encounters an emission reading over 4 mw/cm2 the servicer is to cease repair and contact the Maytag Service Department immediately for further direction. Maytag will contact the proper Government Agency upon verification of the test results.

/64–inch (0.5 mm) when the door is

Important Safety Information

WARNING

Precautions to be observed before 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 surfaces (arcing, wear, and other damage)

• Damage to or loosening of hinges and latches

• Evidence of dropping or abuse

test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity, and connections.

(D) Any failed or misadjusted components in the

interlock, monitor, door seal, microwave generation, and transmission systems shall be repaired, replaced or adjusted by procedures described in this manual before oven is released to the consumer.

(E) Check microwave leakage to verify compliance with

the federal performance standard should be performed on each oven prior to release to the consumer.

Wiring

Good service practice is to never route wiring over terminals and/or sharp edges. This applies to any wiring without regard to the circuit voltage. Wire insulation material and thickness is designed and regulated for electrical spacing purpose only, but cannot always be relied upon because of possible cuts and/or abrasions, which can occur during servicing.

WARNING

To avoid risk of electrical shock, personal injury or death, make sure these earthing instructions are followed.

Earthing Instructions

WARNING

Do not remove earthing prong when installing earthed appliance in a home or business that does not have three wire earthing receptacle, under no condition is earthing prong to be cut off or removed. It is the personal responsibility of the consumer to contact a qualified electrician and have properly earthed three prong wall receptacle installed in accordance with appropriate electrical codes

Should a two prong adapter plug be required temporarily, it is the personal responsibility of the consumer to have it replaced with properly earthed three prong receptacle or the two prong adapter properly earthed by a qualified electrician in accordance with appropriate electrical codes.

Servicing of Earthed Products

The standard accepted color coding for earthing wires is GREEN or GREEN WITH YELLOW STRIPE. These earth leads are NOT to be used as current carrying conductors. It is extremely important that the technician replace any and all earths prior to completion of the service call. Under no condition should earth wire be left off causing a potential hazard to technicians and consumer.

General Information

Unpacking Oven

• Inspect oven for damage such as dents in door or inside oven cavity.

• Report any dents or breakage to source of purchase immediately.

• Do not attempt to use oven if damaged.

• Remove all materials from oven interior.

• If oven has been stored in extremely cold area, wait a few hours before connecting power.

Oven Placement

• Do not install oven next to or above source of heat, such as pizza oven or deep fat fryer. This could cause microwave oven to operate improperly and could shorten life of electrical parts.

• Do not block or obstruct oven filter. Allow access for cleaning.

• Install oven on level countertop surface.

• Place warning label in a conspicuous place close to microwave oven.

• Outlet should be located so that plug is accessible when oven is in place.

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 installed antenna on radio, television, etc. to obtain stronger signal reception.

Earthing Instructions

This appliance MUST be earthed. If an electrical short circuit occurs, earthing reduces the risk of electric shock by providing an escape wire for the electric current. The cord for this appliance has a earthing wire with a earthing plug. Place the plug into an outlet that is properly installed and earthed. Do not use a two–prong adapter.

WARNING

To avoid risk of electric shock, personal injury or death, do not alter the plug and use earthing plug properly.

A—Allow at least 7 " (17.8 cm) of clearance around

top and sides of oven. Proper air flow around oven cools electrical components. With restricted air flow, oven may not operate properly and life of electrical parts is reduced.

B—Allow at least 2 9/16 " (6.5 cm) between air

discharge on back of oven and back wall.

Consult a qualified electrician if you do not understand the earthing instructions or if you wonder whether the appliance is properly earthed.

Keep the electrical power cord dry and do not pinch or crush it in anyway.

The wires in the power cord are colored in accordance with the following code:

• Green/Yellow: Earth

• Blue: Neutral

• Brown: Live

General Information

Receptacle

230 V / 13 AMP

Equipment requires a

230 VAC, 50 Hz, 13 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 required and fuse can be blown.

Plug

Receptacle

230 V / 16 AMP

Equipment requires a

230 VAC, 50 Hz, 16 amp power supply

Plug

Microwave Oven Description

A—Door Handle B—Spatter Shield C—Top Control panel D—Display E—Side Control Panel F—Air Filter

Troubleshooting

Power Up

Plug oven into power source with oven door closed.

Error Code Appears.

STG

ITEM POWER

QTY

1 2 3 4

PREHEAT STANDBY

LMT

NOT READY

COOK LEVEL

YES

POWER UP CONDITION NORMAL

YES

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.

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