Amana Menumaster MLD510 SERVICE MANUAL

Service

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

International

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 specic models

This manual includes, but is

not limited to the following:

Countertop Commercial Microwave Ovens

ALD510D P1331003M UALD510D P1331004M ALD510 P1331005M UALD510 P1331006M MLD510D P1331007M UMLD510D P1331008M MLD510 P1331009M

MLD510A P1331016M

UMLD510 P1331010M

16026969

July 2009

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

Grounding Instructions ............................................... 7

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

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

Servicing of Earthed Products .................................... 8

General Information

Unpacking Equipment ................................................ 9

Equipment Placement ............................................... 9

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

Oven Features ........................................................... 9

Model Identification .................................................... 9

Service ....................................................................... 9

Parts and Accessories............................................... 9

Troubleshooting Procedures ........................................10

Electronic Models ................................................ 11-14

Dial Models ......................................................... 15-16

Service Information

Proper Handling of Magnetron Tubes ........................17

Magnetron Failure Mode ........................................... 17

Microwave Leakage Testing

Equipment ................................................................18

Procedure For Measuring Radiation Leakage ........... 18

Measurement with the Outer Panel Removed ........... 18

Measurement with a Fully Assembled Oven .............18

Record Keeping and Notification

After Measurement ................................................18

Troubleshooting

Operating Instructions for Holaday

HI1501, HI1510, and HI1710 ..................................19

Testing Procedures ................................................. 20-21

Power Test................................................................22

Disassembly Procedures

Disconnecting Wire Terminals .................................. 23

Outer Case ............................................................... 23

Door Assembly .........................................................24

Door Disassembly .................................................... 24

Control Panel (Electronic) .........................................25

Control Panel (Mechanical) ....................................... 25

Interlock Assembly ...................................................25

High Voltage Capacitor ............................................. 26

Diode ........................................................................ 26

High Voltage Fuse ....................................................27

Transformer .............................................................. 27

Filter Assembly / Fuse .............................................. 27

Blower Assembly ...................................................... 27

Magnetron ................................................................ 28

Splatter Shield / Antenna .......................................... 28

Stirrer Motor.............................................................. 29

Magnetron Thermal Cut-Out (Mag TCO) .................... 29

Cavity Thermal Cut-Out (Cavity TCO) ........................ 29

Tray Replacement ..................................................... 29

Oven Light Assembly ................................................29

Slow Acting Relay Assembly .................................... 29

Air Guide ..................................................................29

Appendix A

Dial Model - Quick Reference Guide ....................... A-2

Electonic Model - Quick Refence Guide ................. A-3

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 defective or misadjusted components in the

interlock, monitor, door seal, and 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. This 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 Equipment

• Inspect equipment for damage such as dents in door or dents 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.

Equipment Placement

• Do not install equipment 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 air filter. Allow access for cleaning.

• Install on level countertop surface.

Oven Features

Removable

Splatter Shield

(Not Shown)

Oven Door Window

and Interior Light

Oven Display

Oven Control

Model Identification

• For Amana product call 1-866-426-2621 or visit the Web Site at www.amanacommercial.com

When contacting for service support, provide product information located on rating plate. Record the following:

Model Number: ___________________ Manufacturing Number: ___________________ Serial or S/N Number: ___________________ Date of purchase: ___________________ Dealer’s name and address: ___________________

A—Allow at least 1½ inches / 3.81 centimeters of clearance

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

Radio Interference

Microwave operation may cause interference to radio, television, or similar equipment. Reduce or eliminate interference by doing the following:

• Clean door and sealing surfaces of oven according to instructions in “Care and Cleaning” section.

• Place radio, television, etc. as far as possible from oven.

• Use a properly installed antenna on radio, television, etc. to obtain stronger signal reception.

Service

Keep a copy of sales receipt for future reference or in case warranty service is required. To locate an authorized servicer:

• For Amana product call 1-866-426-2621 or visit the Web Site at www.amanacommercial.com

Warranty service must be performed by an authorized servicer. We also recommend contacting an authorized servicer, if service is required after warranty expires.

Parts and Accessories

Purchase replacement parts and accessories over the phone. To order accessories for your product contact your local product distributor or vist the Web site at www.amanacommercial.com.

Troubleshooting Procedures

When you get a complaint from customers, evaluate the complaint carefully. If the following symptoms apply, instruct the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call.

CAUTION

• Verify proper grounding before checking for trouble.

• Be careful of the high voltage circuit.

• Discharge the high voltage capacitor.

• When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

• Do not touch any part of the circuit on the controller, since static electric discharge may damage the control panel. Always touch yourself to earth while working on this panel to discharge any static charge built up in your body.

Condition Cause Remedy

Microwave oven does not work.

Output power is too low.

Sparks occur.

Uneven cooking. Inconsistent food thickness,

• Inserting multiple plugs into one outlet and using them at the same time (blown fuse or breaker).

• Microwave oven plug is not inserted tightly.

• Low AC input voltage. • Use the microwave oven at

• Food temperature is too low. • This may not be a defect. It is

• Using metallic ware and

allowing it to touch the oven wall.

• Ceram ic ware trimm ed in gold or silver is used.

inconsistent fat or moisture distribution within the food products.

• Avoid using other electrical appliances when you use the microwave oven.

• Insert microwave oven plug securely.

adequate line voltage.

possible that the food should be cooked for a longer time period.

• Do not use metallic ware for cooking.

• Do not use any type of cookware with metallic trimming.

• Use plastic wrap or lid.

• Stir once or twice while

cooking soup, cocoa, milk, etc.

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