Maytag ACO1520AC, ACO1560AW, ACO1840AB, ACO1530AW, ACO1560AB User Manual

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Service

Over The Range 2001 and 2002 Domestic Microwave Ovens

This manual replaces RS2100011 Revision 0.

Service Manual for: Amana Jenn-Air Maytag

Models and manufacturing

numbers in this manual.

2002 models are listed in bold.

ACO1520AB

ACO1520AC

ACO1520AW ACO1530AB ACO1530AW

ACO1560AB ACO1560AC ACO1560AS ACO1560AW

ACO1840AB ACO1840AC ACO1840AW ACO1860AB ACO1860AC ACO1860AS ACO1860AW

JMV8196AAB JMV8196AAQ JMV8196AAS JMV8196AAW MMV4184AAB MMV4184AAQ MMV4184AAW MMV5156AAB MMV5156AAQ MMV5156AAS MMV5156AAW MMV5186AAB MMV5186AAQ MMV5186AAS MMV5186AAW

MVHRK3 MVHRK4

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.

16021668 Revision 0

September 2002

Important Information

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 manual. REVIEW ALL SERVICE INFORMATION

IN THE APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.

Important Notices for Consumers and Servicers

WARNING

To avoid risk of serious injury or death, repairs should not be attempted by an unauthorized personal, dangerous conditions (such as exposure to electrical shock) may result.

CAUTION

Maytag will not be responsible for any injury or property damage from improper service procedures. If performing service on your own product, assume responsibility for any personal injury or property damage which may result.

To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this product. For further assistance, please contact:

Customer Service Support Center

CAIR Center

Web Site Telephone Number

WWW.AMANA.COM ............................................... 1-800-843-0304

WWW.JENNAIR.COM ............................................ 1-800-536-6247

WWW.MAYTAG.COM............................................. 1-800-688-9900

CAIR Center in Canada..........................................1-800-688-2002

Amana Canada Product ............. ............................. 1-866-587-2002

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 or product or property

damage.

Table of Contents

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

Important Product Information...................................... 4

Important Safety Information........................................ 5

Microwave Leakage Testing......................................... 6

General Information

Location of Model Number ........................................ 7

Model Identification ................................................... 7

Parts and Accessories .............................................. 7

Service ...................................................................... 7

Asure™ Extended Service Plan ................................ 7

Oven Specifications ACO15* Models........................ 7

Oven Specifications ACO18* Models........................ 7

Electrical Rating ........................................................ 7

Electrical Requirements ............................................ 7

Grounding Instructions.............................................. 8

Microwave Oven Description .................................... 8

Testing Procedures

Primary Interlock Switch Test.................................... 9

Secondary Interlock Switch Test ............................... 9

Interlock Monitor Switch Test .................................... 9

Magnetron ................................................................. 9

High Voltage Transformer ....................................... 9

High Voltage Capacitor ........................................... 10

High Voltage Diode ................................................. 10

Humidity Sensor...................................................... 10

Relay ....................................................................... 10

Control Key Panel ....................................................10

Circuit Board ........................................................... 12

Fuse ........................................................................ 12

Fan Motor................................................................ 12

Oven Thermostat .................................................... 12

Base Thermostat - ACO18*, JMV8196*,

MMV4184*, and MMV5186* only ......................... 12

Magnetron Thermal Fuse - ACO18*, JMV8196*,

MMV4184*, and MMV5186* only ......................... 12

Surge Resistor ........................................................ 12

Troubleshooting Procedures ...................................... 13

Disassembly Procedures

Grille........................................................................ 18

Door Assembly........................................................ 18

Door Disassembly................................................... 18

Control Panel .......................................................... 19

P.C. Board............................................................... 19

Control Key Panel ................................................... 20

Outer Case.............................................................. 20

Stirrer Assembly (some models) ............................. 21

Interlock Door Latch Switches ................................ 21

High Voltage Capacitor ........................................... 22

Diode....................................................................... 22

Transformer ............................................................ 23

Fuse ........................................................................ 23

Magnetron ............................................................... 23

Magnetron Fan Assembly ....................................... 23

Magnetron Thermal Fuse........................................ 24

Humidity Sensor...................................................... 24

Oven Thermostat .................................................... 24

Base Thermostat..................................................... 25

Light Socket ............................................................ 25

Turntable Motor....................................................... 25

Vent Blower............................................................. 25

Wiring Diagrams And Schematics

ACO1520* and ACO1530* Models ......................... 26

ACO1560* and MMV5156* Models ......................... 27

ACO18*, JMV8196*, MMV4184*, and

MMV5186* Models............................................... 28

Appendix A

Installation Instructions

Parts, Tools, and Materials..................................A-4

Preparing Electrical Connection..........................A-5

Preparing V enting System ..................................A-5

Preparing V enting Blower.................................... A-7

Preparing Wall and Upper Cabinet .....................A-8

Attaching Oven to the Wall ...............................A-10

Appendix B

Care and Cleaning .............................................. B-2

Important Product 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

service 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, 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 should be performed on each oven prior to release to the consumer.

WARNING

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

Grounding Instructions

WARNING

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

Servicing of Grounded Products

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

Important Safety Information

CAUTION

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

The basic design of the Maytag microwave oven makes it an inherently safe device to both use and service. 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 grounded 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 the 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 ground 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 VOL T AGE. When the unit is operating - keep this area clean and free of anything which could possibly cause an arc or ground, 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 open when the door is actuated. The monitor switch MUST close at a 1/4 inch when the door is 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 1/8 inch or less.

1 1.The Maytag microwave oven should never be operated

with:

• Any components removed and/or bypassed.

• Any of the safety interlocks are found to be

failed.

• Any of the seal surfaces are 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 Narda Model 81 10B, Holaday HI-1501, HI-1510, and HI-1710 leakage monitor as outlined in the instructions. The maximum leakage level allowed is 4mW/cm

13.If servicer encounters an emission reading over 4mw/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.

Microwave Leakage Testing

WARNING

Check for radiation leakage after servicing. Should the leakage be more than 4mW/cm2 inform Maytag immediately . After repairing or replacing any radiation safety device, keep a written record for future reference, as required by DHHS and HEW regulations. This requirement must be strictly observed. In addition, the leakage reading must be recorded on the service repair ticket while in the customer’s home.

Equipment

• Electromagnetic radiation monitor

• 600 cc glass beaker

Procedure For Measuring Radiation Leakage

Note before measuring -

• Do not exceed meter full scale deflection. Leak monitor should initially be set to the highest scale.

• To prevent false readings, the test probe should be held by the grip portion of the handle only.

• The scan speed is equal to one inch per antenna revolution or one inch per second if antenna speed is unknown.

• Areas to be checked are all door seal areas and any venting parts.

• Leakage with the outer panel removed...4mW/cm2 or less.

• Leakage for fully assembled oven with door normally closed ...4mW/cm2 or less.

• Leakage for a fully assembled oven (before the latch switch (primary) is interrupted) while pulling the door ... 4mW/cm2 or less.

1 . Pour 275 ±15 cc (9 oz ±1/2 oz) of 20 ±5°C (68 ±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 measuring the leakage, always use the 2–inch

(5 cm) spacer supplied with the probe.

4. Press the start pad or turn on the timer and with the

magnetron oscillating, measure the leakage by holding the probe perpendicular to the surface being measured.

Measurement With the Outer Panel Removed

DANGER

Avoid contacting any high voltage components .

Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring around the magnetron.

Measurement With a Fully Assembled Oven

After all components, including the outer panel are fully assembled, measure for radiation leakage around the door periphery , the door viewing window , the exhaust opening, and air inlet openings.

Record Keeping and Notification After Measurement

1. After any adjustment or repair to a microwave oven, a leakage reading must be taken. Record this leakage reading on the repair ticket even if it is zero.

2. A copy of the repair ticket and the microwave leakage reading should be kept by the repair facility.

General Information

Model Number Label

Please read the owner’s manual information. It will tell how to use all the features of this microwave oven.

Location of Model Number

To request service information or replacement parts, the service center will require the complete model number of your microwave oven. The number is located on the oven front as shown in the illustration below .

Model Identification

Complete enclosed registration card and promptly return. If registration card is missing:

• For Amana product call 1-800-843-0304 or visit the Web Site at www.amana.com

• For Maytag product call 1-800-688-9900 or visit the Web Site at www.mayt ag.com

• For Jenn-Air product call 1-800-536-6247 or visit the Web Site at www.jennair .com

• For product in Canada call 1-866-587-2002 or visit the Web Sites at www.amana.com or www .maytag.com or www.jennair.com

When contacting 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: ___________________

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 1-800-628-5782 or visit the Web Site at www.amana.com

• For Maytag/Jenn-Air product call 1-800-462-9824 or visit the Web Site at www.mayt ag.com or www.jennair.com

• For product in Canada call 1-866-587-2002 or visit the Web Sites at www.amana.com or www .maytag.com or www.jennair.com

Warranty service must be performed by an authorized servicer. We also recommend cont acting an authorized servicer, if service is required af ter warranty expires.

Parts and Accessories

Purchase replacement parts and accessories over the phone. T o order accessories for your product call:

• For Amana product call 1-877-232-6771 or visit the Web Site at www .amana.com

• For Maytag/Jenn-Air product call 1-800-462-9824 or visit the Web Site at www .maytag.com or www.jennair.com

• For product in Canada call 1-866-587-2002 or visit the Web Sites at www.amana.com or www .maytag.com or www.jennair.com

Extended Service Plan

We offer long-term service protection for this new oven.

• Asure™ Extended Service Plan is specially designed to supplement Amana’s strong warranty . This plan covers parts, labor , and travel charges. Call 1-866-232-6244 for information.

• Dependability PlusSM Extended Service Plan is specially designed to supplement Maytag’s and Jenn-Air’s strong warranty. This plan covers p arts, labor, and travel charges. Call 1-800-925-2020 for information.

Oven Specifications ACO15* and MMV5156* Models

Output Power 1000 W (IEC 705) Outer Dimensions 29-15/16" x 16-7/16" x 15-5/8" Oven Cavity Dimensions 19-7/8" x 14-3/16" x 15-3/8" Cavity Volume 1.5 cu. ft. Net Weight 65 lbs.

Oven Specifications ACO18*, MMV4184* and MMV5186* Models

Output Power 1000 W (IEC 705) Outer Dimensions 29-15/16" x 16-7/16" x 15-3/8" Oven Cavity Dimensions 22-3/8" x 10" x 14-19/32" Cavity Volume 1.8 cu. ft. Net Weight 65 lbs.

Oven Specifications JMV8196* Models

Output Power 850 W (IEC 705) Outer Dimensions 29-15/16" x 16-7/16" x 15-3/8" Oven Cavity Dimensions 22-3/8" x 10" x 14-19/32" Cavity Volume 1.9 cu. ft. Net Weight 65 lbs.

Electrical Requirements

The oven is designed to operate on a Standard 120V / 60Hz household outlet. Be sure the circuit is at least 20 Amps and the microwave oven is the only appliance on the circuit.

NOTE: It is not designed for 50Hz or any circuit other

than a 120V / 60Hz circuit.

General Information

Model and serial

Grounding Instructions

This appliance must be grounded. If an electrical short circuit occurs, grounding reduces the risk of electric shock by providing an escape wire for the electric current. The cord for this appliance has a grounding wire with a grounding plug. Put the plug into an outlet that is properly installed and grounded.

WARNING

To avoid risk of electric shock, personal injury or death, use grounding plug properly .

Properly Polarized and

Grounded Outlet

Three-Pronged (Grounding) Plu

Ask a qualified electrician if you do not understand the grounding instructions or if you wonder whether the appliance is properly grounded.

Because this appliance fits under the cabinet, it has a short power-supply cord. See the Installation Instructions for directions on placing the cord properly . Keep the electrical power cord dry and do not pinch or crush it in any way .

Microwave Oven Description

number plate

Window with metal shield

oor handle

Glass turntable

For a permanently connected appliance: This appliance must be connected to a grounded, metallic, permanent wiring system, or an equipment grounding conductor should be run with the circuit conductors and connected to the equipment grounding terminal or lead on the appliance.

Vent grille

Cooking guide

Door safety lock system

Cooktop/countertop light

Grease filter

Oven contro panel

Testing Procedures

WARNING

NOTES:

• Perform microwave energy leakage test if unit is serviced for any reason.

• V erify wire leads are connected to correct positions.

• When removing wire terminal plugs from connectors, grasp the connector, not the wires.

Primary Interlock Switch Test

When the door is opened slowly , an audible click should be heard. If the latch does not activate the switch when the door is closed, the switch should be adjusted in accordance with the adjustment procedure.

1. Disconnect power to oven and remove control panel,

(see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage

Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads from switch.

4. Perform a continuity test by connecting one meter

lead on COM terminal and the other meter lead on NO terminal.

Readings should be as follows:

Door closed .................0 ohms

Door opened ...............Infinite ohms

NOTE: When replacing component use identical

replacement part.

NOTE: After repairing the door or the interlock system,

it is necessary to do a continuity test before operating the oven.

Secondary Interlock Switch Test

1. Disconnect power to oven and remove control panel,

(see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage

Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads from switch.

4. Perform a continuity test by connecting one meter

lead on COM terminal and the other meter lead on NO terminal.

Readings should be as follows:

Door closed .................0 ohms

Door opened ...............Infinite ohms

NOTE: When replacing component use identical

replacement part.

NOTE: After repairing the door or the interlock system,

it is necessary to do a continuity test before operating the oven.

Disconnect power before performing the following procedures unless testing requires it.

Interlock Monitor Switch T est

When the door is opened slowly, an audible click should be heard. If the latch does not activate the switch when the door is closed, the switch should be adjusted in accordance with the adjustment procedure.

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High Voltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads from switch.

4. Perform a continuity test by connecting one meter lead on COM terminal and the other meter lead on NC terminal.

Readings should be as follows:

Door closed .................Infinite ohms

Door opened ...............0 ohms

NOTE: When replacing component use identical

replacement part.

NOTE: After repairing the door or the interlock system,

it is necessary to do a continuity test before operating the oven.

Magnetron

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High Voltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads to magnetron.

4. Measure the resistance across filament terminals of the magnetron.

Reading should be less than 1 ohm.

5. Measure the resistance from each filament terminal to ground. Reading should indicate infinite ohms.

NOTE: Any other readings then what should be

indicated, magnetron needs to be replaced.

NOTE: Replace the magnetron, if magnetron

indications are good and all other high voltage components test good, but the unit still does not heat a load.

High Voltage Transformer

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High Voltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads to high voltage transformer.

Testing Procedures

WARNING

4. Measure resistance of the terminals on the high voltage transformer with meter on R x 1 scale.

Reading should be indicated as follows:

Primary winding ......less than 1.0 ohms

Filament winding ....less than 1.0 ohms

Secondary winding.approximately 50 to 120 ohms

5. Measure resistance of the terminals on the high voltage transformer with meter on high scale.

Reading should be indicated as follows:

Primary winding to ground....... Infinite ohms

Filament winding to ground ..... Infinite ohms

High Voltage Capacitor

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads to high voltage capacitor.

4. Measure resistance of capacitor from terminal to terminal.

• Normal reading—momentarily indicates several

ohms and then gradually returns to infinite ohms.

• Abnormal reading—Indicates continuity or infinite

ohms.

5. Measure resistance of capacitor from terminal to case.

• Normal reading—Indicates infinite ohms

• Abnormal reading—Indicates continuity

Disconnect power before performing the following procedures unless testing requires it.

4. Measure the following terminals with meter on R x 1000 scale.

Normal indication:

T erminal 1 to terminal 2......... 4.5K to 6.2K ohms

Terminal 2 to terminal 3........ 2.0K to 3.5K ohms

Terminal 1 to terminal 3........ 2.0K to 3.5K ohms

Abnormal indication:

Infinite or several ohms

Relay

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire terminal plug from control board (ACO18*, RY2) (ACO15*, RY7), and operate the unit.

Rela

High Voltage Diode

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads to high voltage diode.

4. Measure resistance of diode in forward bias.

• Normal reading—Indicates continuity

• Abnormal reading—Indicates infinite ohms

5. Measure resistance of diode in reverse bias.

• Normal reading—Indicates infinite ohms

• Abnormal reading—Indicates continuity

Humidity Sensor

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire terminal plug from control board (CN5).

Power Level Cycles On for: Cycles Off for:

1 4 seconds 18 seconds 2 6 seconds 16 seconds 3 8 seconds 14 seconds 4 10 seconds 12 seconds 5 12 seconds 10 seconds 6 14 seconds 8 seconds 7 16 seconds 6 seconds 8 18 seconds 4 seconds 9 20 seconds 2 seconds 10 22 seconds 0 seconds

Control Key Panel

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section in Disassembly Procedure).

Testing Procedures

2 3

WARNING

3. Disconnect ribbon connector by siding top part of connector upward. Once in released position remove ribbon from connector by siding ribbon side-to-side.

NOTE: Caution should be used when removing cable

from connector. Ribbon cable has two holes which holds the lock ribbon in place.

NOTE: Circuit board has numbers 1 and 13 on it for

identification.

1 2 3 4 5 6 7 8 9 1 1 1 1

ACO1520/ACO1530 models Pad Conn. Pad Conn.

Vent HI/LOW/OFF 1 - 8 Auto Defrost 5 - 9 Light HI/LOW/OFF 1 - 9 Kitchen Timer 5 - 10

Control Setup 2 - 9 Power Level 5 - 11 Clock 2 - 10 Hold Warm 5 - 12 Stop Clear 2 - 12 5 6 - 8 Auto Cook 3 - 8 6 6 - 9 Auto Reheat 3 - 9 7 6 - 10 Easy Cook 3 - 10 8 6 - 11 S ta rt 3 - 12 9 6 - 12 Frozen Entree 3 - 13 0 7 - 8 Popcorn 4 - 8 1 7 - 9 Potato 4 - 9 2 7 - 10 Beverage 4 - 10 3 7 - 11 Pizza 4 - 11 4 7 - 12 Program 5 - 8

ACO1560/MMV5156 models Pad Conn. Pad Conn.

Vent HI/LOW/OFF 1 - 8 Auto Defrost 5 - 9 Light HI/LOW/OFF 1 - 9 Kitchen Timer 5 - 10

Less 1 - 10 Power Level 5 - 11 Favorite Recipe 1 - 11 Hold Warm 5 - 12 T/T able ON/OFF 1 - 12 Sensor Veg. 5 - 13 More 1 - 13 5 6 - 8 Help 2 - 8 6 6 - 9 Control Set-Up 2 - 9 7 6 - 10 Clock 2 - 10 8 6 - 11 Light Timer 2 - 11 9 6 - 12 Stop Clear 2 - 12 Sensor Reheat 6 - 13 Sensor Pizza 2 - 13 0 7 - 8

Disconnect power before performing the following procedures unless testing requires it.

ACO1560/MMV5156 models continued

Easy Cook 3 - 10 1 7 - 9 Time Defrost 3 - 11 2 7 - 10 Star t 3 - 12 3 7 - 11 Sensor Potato 3 - 13 4 7 - 12 Sensor Popcorn 4 - 13 Sensor Cook 7 - 13 Program 5 - 8

ACO1840/MMV4184 models Pad Conn. Pad Conn.

Vent HI/LOW/OFF 1 - 8 Beverage 4 - 10 Light HI/LOW/OFF 1 - 9 Pizza 4 - 11

Less 1 - 10 Rapid Defr. 1lb. 4 - 12 Favorite Recipe 1 - 11 Program 5 - 8 Turn Table ON/OFF 1 - 12 Auto Defrost 5 - 9 More 1 - 13 Kitchen Timer 5 - 10 Help 2 - 8 Power Level 5 - 11

Control Setup 2 - 9 Hold Warm 5 - 12 Clock 2 - 10 5 6 - 8 Light Timer 2 - 11 6 6 - 9 Stop Clear 2 - 12 7 6 - 10 Cook 3 - 8 8 6 - 11 Reheat 3 - 9 9 6 - 12 Easy Cook 3 - 10 0 7 - 8 Time Defrost 3 - 11 1 7 - 9 Sta rt 3 - 12 2 7 - 10 Popcorn 4 - 8 3 7 - 11 Potato 4 - 9 4 7 - 12

ACO1860/MMV5186/JMV8196 models Pad Conn. Pad Conn.

Vent HI/LOW/OFF 1 - 8 Program 5 - 8 Light HI/LOW/OFF 1 - 9 Auto Defrost 5 - 9

Less 1 - 10 Kitchen Timer 5 - 10 Favorite Recipe 1 - 11 Power Level 5 - 11 Turn Table ON/OFF 1 - 12 Hold Warm 5 - 12 More 1 - 13 Sensor Ve g. 5 - 13 Help 2 - 8 5 6 - 8

Control Setup 2 - 9 6 6 - 9 Clock 2 - 10 7 6 - 10 Light Timer 2 - 11 8 6 - 11 Stop Clear 2 - 12 9 6 - 12 Sensor Pizza 2 - 13 Sensor Reheat 6 - 13 Easy Cook 3 - 10 0 7 - 8 Time Defrost 3 - 11 1 7 - 9 Start 3 - 12 2 7 - 10 Sensor Potato 3 - 13 3 7 - 11 Rapid Defrost 1 lb. 4 - 12 4 7 - 12 Sensor Popcorn 4 - 13 Sensor Cook 7 - 13

Testing Procedures

Model Fahrenheit Centigrade Cycle

WARNING

Circuit Board

Following symptoms indicate a failed circuit board.

• High voltage systems, interlock switches, door sensing and relay indicate good, but start function fails to operate.

• Continuously operating with a normal relay .

• Proper temperature measurement is not obtained.

• Buzzer does not sound or sounds continuous.

• Segments of one or more digits do not light, or continue to light or segments light when they should not.

• Wrong figures appear in the display .

• All segments light up.

• Some of the indicators light up or flicker .

• Clock does not keep time properly .

Fuse

CAUTION

Before replacing a blown monitor fuse, test the primary interlock switch, secondary interlock switch, monitor switch, and power relay contacts for proper operation. If the monitor fuse is blown by a failed switch operation, all switches and printed circuit board must be replaced.

Disconnect power before performing the following procedures unless testing requires it.

Oven Thermostat

1. Disconnect power to oven and remove control panel, (see "Control Panel" section).

2. Discharge high volt age capacitor, (see "High V oltag e Capacitor" section).

3. Remove outer case, (see "Outer Case" section).

4. Lift air duct securing thermostat to oven cavity.

5. Disconnect wires from oven thermostat.

6. Following is temperature setting for the thermostat.

ACO15* MMV5156* ACO18* MMV4184* MMV5186* JMV8196*

194°F90°C 32°F0°C

230°F110°C 32°F0°C

OFF ON

Base Thermostat – ACO18*/MMV4184*/ MMV5186*/JMV8196* only

1. Disconnect power to oven and remove control panel, (see "Control Panel" section).

2. Discharge high volt age capacitor, (see "High V oltag e Capacitor" section).

3. Remove screws securing thermostat to base plate and disconnect wires from thermostat.

4. Following is temperature setting for the thermostat.

Problem:

• Fuse blows immediately after oven door is opened or closed.

• Improper operation of primary , secondary and/or monitor switches.

• Fuse blows when oven door is closed and ST ART pad is pressed.

• Malfunction of the high voltage transformer , high voltage capacitor including the diode, magnetron, blower motor or circuit board.

Fan Motor

1. Disconnect power to oven and remove control panel, (see “Control Panel” section in Disassembly Procedure).

2. Discharge high voltage capacitor , (see "High V oltage Capacitor" section in Disassembly Procedure).

3. Disconnect wire leads to fan motor.

4. Measure resistance of the terminals on the fan motor with meter on R x 1 scale.

Normal indication:

T erminal A to terminal C ........140 to 150 ohms

T erminal A to terminal B ........25 to 40 ohms

Magnetron Thermal Fuse – ACO18*/ MMV4184*/MMV5186*/JMV8196* only

1. Disconnect power to oven and remove control panel, (see "Control Panel" section).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" section).

3. Remove outer case, (see "Outer Case" section).

4. Remove screws securing thermal fuse to fan motor.

5. Disconnect wires from magnetron thermal fuse.

6. Following is temperature setting for the thermostat.

Fahrenheit Centigrade

228°F109

Surge Resistor

This resistor prevents the oven from tripping circuit breakers and blowing fuses during start up.

1. Disconnect power to oven and remove control panel, (see "Control Panel" section).

2. Disconnect wire terminals to the resistor and measure resistance of the resistor.

• Normal reading—approximately 15 ohms.

• Abnormal reading—Indicates infinite ohms.

Troubleshooting Procedures

"PLEASE TOUCH TIME OF DAY"

does not appear in

the display,

when unit is plugged in.

Measure voltage

between pin 1

and pin 3 of

CN1 connector

Is 120 volts

indicated.

Verify proper

connection of

circuit board.

1. Check power supply.

2. Check fuse.

3. Check oven thermostat.

YES

Replace

circuit

board.

Unit operates.

Display does not

indicate correct number

pressed or correct

indication when

programmed.

Is continuity

indicated when

key pad is

pressed.

Replace

control

key pad.

Unit operates.

YES

Measure resistance

of control key

panel after removing

ribbon connector.

Verify proper

connection of

ribbon

connector.

Reconnect

ribbon connector

for proper

connection.

Key pad matrix is located in “Testing Procedures” on page 11.

Does ribbon

connector have

proper

connection.

YES

Replace

circuit

board.

Troubleshooting Procedures

Check:

1. Touch Keypad.

Display does not

count down when

START is pressed.

Is continuity indicated.

Adjust or

replace door

sensing

switch.

Unit operates.

YES

Measure resistance of

CN2 between pin 1 and

pin 3 with door closed.

Verify proper

connection of

ribbon

connector.

Reconnect

ribbon connector

for proper

connection.

Does ribbon

connector have

proper

connection.

YES

Replace

circuit

board.

No buzzer sound when

pressing control pad between stages or at

the end of cooking.

Replace

circuit board.

Verify normal

operation of

circuit board.

Unit operates.

Troubleshooting Procedures

Check:

1. Air Vents.

Unit operates normal,

but little or no heating

is produced with an

oven load.

Does fan motor

operate when

START is

pressed.

Place a jumper

wire across

thermostat.

Does

fan motor

operate.

YES

Check if fan motor

operates when

START is pressed.

Measure

resistance

of high voltage

capacitor.

Replace high

voltage

capacitor.

Replace

thermostat.

Does capacitor have

correct resistance.

See to Testing

Procedures on

page 10.

Replace

magnetron.

YES

Measure

resistance

of fan motor,

approximately

38 ohms.

Is the resistance

of fan motor

correct.

YES

Replace

fan motor.

Unit operates.

Replace

circuit

board.

Troubleshooting Procedures

Check:

1. Primary and Secondary Interlock Switches.

2. Thermostat.

Unit does not heat even

if display counts down

when START pad is

pressed for high power.

Does relay

contacts measure

correct resistance.

Replace

circuit board.

Unit operates.

YES

Check the

contacts of

RY2 relay.

Verify proper

connection of

ribbon

connector.

Reconnect ribbon

connector for

proper

connection.

Does ribbon

connector have

proper

connection.

YES

Replace

circuit

board.

Unit does not heat even

if display counts down

when START pad is

pressed for high power.

Does transformer

have the correct

resistance.

Replace high voltage transformer.

Unit operates.

Measure resistance of

high voltage transformer.

See to Testing

Procedures on page 10.

Measure

YES

resistance of high voltage capacitor.

See to

Testing Procedures

on page 10.

high voltage transformer.

Replace

high

voltage

diode.

magnetron.

Replace

Does capacitor

have correct

resistance.

resistance of high

voltage diode.

Testing Procedures

Does diode

have correct

resistance

YES

Measure

See to

on page 10.

Troubleshooting Procedures

Check:

1. Power Supply.

2. Fuse.

Ventilation fan does

not operate when

FAN HIGH/LOW pad

is pressed.

Does magnetron

thermal fuse and

oven thermostat have

the correct resistance.

Test and

replace

failed

component.

Unit operates.

YES

Measure resistance

of magnetron thermal fuse and oven thermostat.

Verify proper connection of

ribbon

connector.

Reconnect ribbon

connector for

proper connection.

Replace

ventilation

fan.

Does ribbon

connector have

proper

connection.

YES

Replace

circuit board.

Does

unit

operate.

YES

Disassembly Procedures

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

NOTE: All procedures are written for the ACO18*,

JMV8196*, MMV4184, and MMV5186* models. Specific instruction for the ACO15*, MMV5156* models are as described in the procedures.

High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.

It is neither necessary or advisable to attempt measurement of the high voltage.

Before touching any oven components or wiring, always unplug the oven from its power source and discharge capacitor.

Grille

The top full-width grille is removable for service to some components, such as: humidity sensor , oven light, door removal, flame sensor, vent motor capacitor, fuse, control panel, and stirrer motor (some models).

Grille Removal

1. Disconnect power to oven.

2. Remove screws located in front on top of microwave securing grille.

Door Removal

1. Disconnect power to oven and remove grille, (see "Grille" procedure).

2. Open the oven door, slowly raise the door evenly . disengaging the pins at the top and bottom.

NOTE: When aligning the door for assembly, the door

must be opened as much as possible.

3. To place door back on unit, place bottom pin into hole first and then align the top pin. Once pins are aligned push door downward to lock into place.

4. Replace front grille to complete assembly.

3. Pull outward on the top portion of the grille releasing the tabs.

4. Reassemble in reverse order.

Door Assembly

CAUTION

A microwave leakage test must be performed anytime a door assembly is removed, replaced, disassembled or adjusted for any reason.

Door Disassembly

1. Disconnect power to oven and remove oven door, (see "Door Removal" procedure).

2. Pry away choke cover, by placing a tool in the upper right corner of the door and gently prying outward on the choke cover. Continue to work around the door casing until choke cover is completely loose.

CAUTION

To avoid property damage, care must be taken when prying choke cover from oven door.

3. Slide latch assembly upward and to the left to release plastic tabs from door frame. Once latch assembly is loose the spring may be disconnected from the door frame.

4. Remove screws securing door handle and door frame to door panel.

5. Remove door frame by releasing tabs around entire door panel.

Disassembly Procedures

F c

Choke

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

6. Remove door handle by placing a hand on door panel next to the top of the door handle. T wist door panel towards the inside of door and pulling on the top portion of the door handle in a quick jerking motion.

NOTE: When replacing door handle, the bottom portion

of the door handle must be inserted first.

7. Slide door glass to the right slightly, then push the door glass upward to release the glass from the track.

8. Reassemble in reverse order.

Door panel

Door frame

Tape seal

cover

Screw

Control Panel

The control panel is made up of several components, such as p.c. board and touch panel.

Control Panel Removal

1. Disconnect oven power and remove grille, (see "Grille" section).

2. Remove screw located at the top of touch panel. Lift control panel up and out to release bottom tab connections.

3. Place control panel on a flat surface.

4. Reassemble in reverse order.

Door glass

Door handle

CAUTION

Once outer door trim panel is removed the glass panel is loose.

CAUTION

A microwave leakage test must be performed anytime a door assembly is removed, replaced, disassembly , or adjusted for any reason.

Spring

Latch assemb

P.C. Board

The p.c. board is located at the top on back of control panel. Some boards has up to five connection plugs which control the following:

CN1 Main power connector FPC (S1) Ribbon connector for key panel Relay 7 Relay connector

Control Pan

Screw

Circuit Board

Power

Transforme

PC (S-1) onnector

CN1

Relay 7

ACO1520*, ACO1530*, and MMV5156*

Disassembly Procedures

P T

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

CN 1 Main power connector CN2 Primary switch CN5 Humidity sensor (some models) FPC (S1) Ribbon connector for key panel Relay 2 Relay connector

Screw

(CN5)

FPC (S-1) connector

ower ransformer

ACO1840*, ACO1860*, JMV8196*,

MMV4184*, and MMV5186*

P.C. Board Removal

1. Disconnect oven power and remove grille, (see "Grille" procedure).

2. Remove control panel, (see "Control Panel" procedure).

3. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

4. Disconnect ribbon connector by sliding top part of connector upward. Once in released position remove ribbon from connector by siding ribbon side-to-side.

NOTE: Caution should be used when removing cable

from connector. Ribbon cable has two holes which connector locks ribbon in place.

5. Disconnect and mark the wire connectors from p.c. board.

6. Remove screws securing p.c. board to control panel assembly.

7. Reassemble in reverse order.

NOTE: Do not flex p.c. board.

(CN2)

Control Pan

Circuit Board

CN5

CN2

Relay 2

CN1

Control Key Panel

The key panel has one ribbon connection on the p.c. board.

The key panel pads can be checked through a continuity test. Operations of key pad can be checked by measuring connections at end of ribbon, (using high ohms scale).

Plastic

fastener

Hook

Holes

F.P.C.

connector

Terminal

socket

Control Key Panel Removal

1. Disconnect power to oven.

2. Remove control panel, (see "Control Panel" section).

3. Discharge high voltage capacitor, (see "High V oltage capacitor section).

4. Disconnect ribbon connector by sliding top part of connector upward. Once in released position remove ribbon from connector by siding ribbon side-to-side.

NOTE: Caution should be used when removing cable

from connector. Ribbon cable has two holes which connector locks ribbon in place.

5. Peel failed key pad off and replace with new key pad.

6. Reassemble in reverse order.

Outer Case

NOTE: This procedure requires removal of unit.

1. Disconnect power to oven and remove grille, (see "Grille" procedure).

2. Remove oven door, (see "Door Removal" procedure).

3. Remove screws securing air duct to outer case.

4. Remove screws securing outer case to the chassis.

5. Remove screws securing vent plate to outer case.

6. Remove screw securing power cord cover to outer case and remove power cord cover (if equipped).

7. Slide outer case towards the rear of the unit, guide power cord though outer case power cord hole.

8. Place outer case to the side, so no damage will occur to the case.

Disassembly Procedures

)

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

9. Reassemble in reverse order .

Vent plate

Power cord cover

Door

Mounting

plate

Outter cas

Vent grille

Controller

Stirrer Assembly (some models)

Motor driven antenna assembly is located at the top of the cavity , using a top feed wave guide.

Stirrer Blade Removal

1. Disconnect power to oven and open the oven door.

2. Carefully pry downward on the plastic rivets securing the stirrer cover.

3. Rotate slightly and pull down on stirrer fan cover .

4. Reassemble in reverse order.

Interlock Door Latch Switches

Primary switch is operated by bottom latch pawl.

Interlock Switch Removal

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Test interlock switches before removing, (see Testing Procedures).

4. Disconnect and label wire connections.

5. Remove interlock switch.

Latch Board

Secondary Interlock Switch

WH (from H.V. Transformer)

WH (from Monitor S/W) WH (from Oven Thermostat) WH (from Cooktop Lamp)

Monitor Interlock Switch

WH (from Secondary switch

RD (from Relay 7)

Primary Interlock Switch

GN (from P.C.B)

YL (from P.C.B)

ACO15020*, ACO1530*, and MMV5156*

ACO1840*, ACO1860*, JMV8196*,

MMV4184*, and MMV5186*

Disassembly Procedures

WARNING

Latch Board

Secondary Interlock Switch

WH (from H.V. Transformer)

YL (from F an Motor) WH(from PowerCord) WH (from Cooktop Lamp)

Monitor Interlock Switch

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

5. Hold latch board securely for proper switch operation and door fit, retighten screws.

6. Open the oven door slowly, watching the switches. V erify switches release in the following order.

• Primary interlock switch

• Secondary interlock switch

• Monitor interlock switch

NOTE: Adjust the latch board until all switches operate

in proper sequence.

7. Close the oven door slowly, watching the switches. V erify switches active in the following order .

• Monitor interlock switch

• Secondary interlock switch

• Primary interlock switch

8. When proper sequence of switch has been achieved, tighten the latch board securely .

WH(from H.V. Transforme

RD (from H.V. Transforme

Primary Interlock Switch

PK (from P.C.B)

BL (fromP.C.B)

ACO1840*, ACO1860*, JMV8196*,

MMV4184*, and MMV5186*

CAUTION

Adjusting Interlocks

The interlock monitor and primary switches act as a final safety switch, protecting the operator from microwave energy . After adjusting the interlock switches, verify connections are correctly connected.

For door fit and switch operation, switch housing is adjustable.

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Loosen switch housing mounting screws on vertical flange.

4. Close oven door, move latch board upward toward the top of the oven and/or away from the door latch until gaps are less than 1/64–inch (0.5 mm).

CAUTION

A microwave leakage test must be preformed anytime a door assembly is removed, replaced, disassembled or adjustment of latch board is made.

High Voltage Capacitor

High voltage capacitor should always be discharged by shorting a terminal to a chassis ground. The capacitor has a internal "shunt" resistor, but the mechanical discharge should always be performed to avoid personal injury.

High Voltage Capacitor Removal

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor by connecting a jumper wire to the terminal of high voltage capacitor with the diode connected to it. Connect the other end of the jumper wire to a well insulated screwdriver and touch a nearby chassis ground screw.

3. Remove screws that secure capacitor and diode.

4. Slide capacitor mounting bracket out of the slots and pull outward on capacitor , diode and bracket.

5. Reassemble in reverse order.

Diode

The diode is located next to the high voltage capacitor.

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Disconnect diode wire terminal from high voltage capacitor and remove screw securing diode to ground.

4. Reassemble in reverse order .

Disassembly Procedures

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

Transformer

High voltage transformer can be serviced through the front of the unit.

Power Transformer Removal

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

NOTE: On the ACO15* and MMV5156* models, remove

the metal protector located above control panel.

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Disconnect and label wire leads from transformer.

4. Remove screws securing transformer and remove out through the front.

5. Reassemble in reverse order.

Fuse

On the ACO15* and MMV5156* models the fuse is located behind the grille in line with the power cord on the right side of the unit.

On the ACO18*, JMV8196*, MMV4184*, and MMV5186* models the fuse is located behind the grille on the right side attached to the air duct.

Fuse Removal

1. Disconnect power and remove grille, (see "Grille procedure).

2. Remove and replace fuse and reassemble in reverse order.

CAUTION

Magnetron

Magnetron is mounted on the side of the cavity to provide a top feed single waveguide.

1. Disconnect power to oven and remove grille, (see "Grille" procedure).

2. Remove control panel, (see "Control Panel" procedure).

NOTE: On the ACO15* and MMV5156* models, remove

the metal protector located above control panel.

3. Remove outer case, (see "Outer Case" procedure).

4. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

5. Remove screws securing magnetron to the wave guide.

6. Carefully remove the magnetron.

7. Reassemble in reverse order.

NOTE: When replacing the magnetron, make sure the

gasket is in the correct position and in good condition.

CAUTION

During replacement of magnetron, be certain the R.F. anode gasket is in place around anode stud.

WARNING

A microwave leakage test must be performed anytime a magnetron assembly is removed, replaced, disassembled or adjusted for any reason.

Magnetron Fan Assembly

Magnetron fan motor provides cool air circulation from an external air source, which provides direct cool air through air vanes surrounding the magnetron. This assembly is located above the magnetron.

Magnetron Fan Removal

1. Follow steps 1 through 4 of "Magnetron" procedure.

2. Remove fan blade from fan motor.

3. Remove screws securing fan motor to air duct.

4. Disconnect wires from fan motor, and lift fan motor assembly out.

5. Reassemble in reverse order.

Disassembly Procedures

Magnetron Thermal Fuse

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

Magnetron Thermal Fuse

NOTE: Thermal fuse is not resettable.

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Remove outer case, (see "Outer Case" procedure).

4. Disconnect and label wire terminals.

5. Remove screw securing thermal fuse to cooling fan.

6. Replace and reassemble in reverse order.

Fan Moto

Oven Thermostat

The oven thermostat is on the air duct assembly. Thermostat is a resettable thermostat.

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Remove outer case, (see "Outer Case" procedure).

4. Disconnect wire terminals from oven thermostat.

NOTE: On ACO15* and MMV5156* oven thermostat is

used as magnetron thermal fuse as well.

Humidity Sensor

The sensor is a plug-in device located in the air exhaust duct.

Humidity Sensor Removal

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Remove outer case, (see "Outer Case" procedure).

4. Remove screws securing sensor to air duct.

5. Disconnect wire terminal plug and replace with new sensor.

6. Reassemble in reverse order.

NOTE: On ACO18*, JMV8196*, MMV4184*, and

MMV5186* lift upward on left rear corner of air duct to release oven thermostat.

5. Replace and reassemble in reverse order .

Disassembly Procedures

Blower

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

Base Thermostat

The base thermostat is located behind the control panel assembly.

NOTE: Thermostat is a resettable thermostat.

1. Disconnect power to oven and remove control panel, (see "Control Panel" procedure).

2. Discharge high voltage capacitor, (see "High V oltage Capacitor" procedure).

3. Remove screws securing thermostat to base plate and disconnect wires from thermostat.

4. Reassemble in reverse order.

3. Open the oven door , remove turntable, and gently pry upward on turntable shaft.

4. Disconnect wire leads from turntable motor .

Wire lead

Turntable moto

5. Remove screws securing turntable to the oven cavity.

6. Replace and reassemble in reverse order.

Vent Blower

V ent blower is a two speed (HI-LOW) cap acitor run blower assembly located on top of the oven. The blower is operated by voltage relays located on the p.c. board.

V ent Exhaust Blower Removal

1. Disconnect power to unit and remove unit from its installation.

2. Remove screws securing damper and motor assembly to top and back of unit.

plate

Light Socket

1. Disconnect power to oven and remove grille, (see "Grille" procedure).

2. Remove screws securing bulb holder.

3. Remove light bulb. Remove light socket.

4. Disconnect wire terminal plug.

5. Replace and reassemble in reverse order.

Turntable Motor

1. Disconnect power to oven.

2. Remove screws securing bottom plate cover.

3. Remove damper.

4. Lift blower assembly out and disconnect wire connection wire terminal.

5. Reassemble in reverse order.

NOTE: Place blower assembly wires in slotted area to

lower

unit

Blower unit

mounting screw

avoid pinching of wires.

Wiring Diagram and Schematic

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

ACO1520* and ACO1530* Models

Wiring Diagram and Schematic

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

ACO1560* and MMV5156* Models

Wiring Diagram and Schematic

WARNING

To avoid the risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitors before following any disassembly procedure.

ACO18*, JMV8196*, MMV4184, and MMV5186* Models

Installation Instruction

Appendix A

Installation Instruction

Model Number Label

(

Properly Polarized and

Proper installation is the installer’ s responsibility!

Write the model & serial numbers on the owner’s manual. The model number label is located on the oven front.

The mounting plate is located on the back side of the microwave oven.

Mounting

plate

Remove from

back of oven)

The dimensions of the oven are as follows:

ACO15* Models ACO18* Models

• Height : 16 7/16 in. 16 7/16 in.

• Width : 29 15/16 in. 29 15/16 in.

• Depth : 15 3/8 in. 15 1/2 in.

• Weight : 52 lbs. 60 lbs.

Electrical rating of this oven: 120V AC 60Hz.

• 13 A / 1500 W (Microwave oven, Cooktop Lamps, Ventilation Fan)

• You need a DEDICATED 120VAC / 60Hz / 20A, fused electrical supply (located in the cabinet above the microwave as close as possible to the microwave) serving only the microwave.

WARNING

To avoid risk of electrical shock, personal injury or death; do not use the grounding plug improperly .

• Check with a qualified electrician if you are not sure whether the oven is properly grounded or if you do not completely understand the grounding instructions.

• Do not use a fuse in the neutral or grounding circuit.

• Save these instructions for the local electrical inspector’s use.

• This appliance MUST be grounded!

• If there is an electrical short circuit, grounding reduces the risk of electrical shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a grounding wire with a grounding plug.

• Place the plug into a properly installed and grounded outlet.

• Do not use an extension cord.

• Keep the power cord dry and do not pinch or crush.

• Do not, under any circumstances, remove the power supply cord grounding prong.

Grounded Outlet

To avoid risk of personal injury two people are required to install this oven.

Avoid Electrical Shock!

• Before you drill into the wall, note where electrical outlets are and where electrical wires might be concealed behind the wall. YOU COULD GET AN ELECTRIC SHOCK if you contact electrical wires with your drill bit.

• Locate and disconnect the power to any electrical circuits that could be affected by installing this oven.

IF YOU DO NOT DISCONNECT THE POWER, YOU COULD GET AN ELECTRIC SHOCK.

CAUTION

Three-Pronged (Grounding) Plu

Installation Instruction

WARNING

If you do not use the microwave oven as instructed, you could be exposed to excessive microwave energy.

Do not expose yourself to excessive microwave energy!

• DO NOT try to operate the microwave oven with the door open.

• DO NOT tamper with or defeat the safety interlocks.

• DO NOT place objects between the microwave oven front face and the door.

• DO NOT allow soil or cleaner residue to build up on the flat surfaces around the microwave oven door.

• DO NOT operate the microwave oven if it is damaged.

• The microwave oven door must close properly to operate safely.

• DO NOT USE THE MICROWAVE OVEN:

• If the door is bent.

• If the hinges or latches are broken or loose.

• If the door seals, sealing surfaces or glass is broken.

• DO NOT ATTEMPT TO ADJUST OR REPAIR THE OVEN YOURSELF!

• It should be adjusted and repaired by a qualified technician who can check for microwave leakage after repairing the oven.

WARNING

If you do not mount the oven as instructed, you risk personal injury and/or property damage.

CAUTION

Before you begin installing the oven, PLACE A PIECE OF THE CARTON OR OTHER HEAVY MATERIAL (a blanket) over the countertop or cooktop to protect it. Do not use a plastic cover . Failure to protect these surfaces could result in property damage.

Make sure you have enough space and support.

• Mount the oven against a flat, vertical wall, so it is supported by the wall. The wall should be constructed of minimum 2" x 4" wood studding and 3/8" thick drywall or plaster/lath.

• ATTACH AT LEAST ONE of the two lag screws supporting the oven to a vertical, 2" x 4" wall stud.

• DO NOT mount the microwave oven to an island or peninsula cabinet.

• BE SURE the upper cabinet and rear wall structures are able to support 150 lbs., plus the weight of any items you place inside the oven or upper cabinet.

• Locate the oven away from strong draft areas, such as windows, doors, and strong heating vents.

• BE SURE you have enough space. See illustration below for minimum vertical and horizontal clearance.

• This microwave oven can be installed over gas or electric cooking products no more than 36 inches wide.

Grounded Outlet (inside upper cabine

Power Supply Cord Hole

30" min. cabinet opening width

30" min. clearance from bottom

/16"min.microwaveoven

13 -

to cooking surface or

countertop

Maximum gas or electric cooking product widthof 36 inches.

of cabinet to cooking sur face or countertop

(Use templates included

with installation instructions)

Installation Instruction

One power cord clamp and

Parts, Tools, and Materials

The following parts are supplied with the oven: NOTE: Depending on ventilation requirements, not all parts will be used.

One dark-colored mounting screw

Backdraft damper / duct connector

(for roof-venting or wall-venting installation)

Not Actual Size ( 2 pieces must be assembled as shown )

(to hold the power cord)

Actual Size

Two self - tapping screws

(for attaching the damper duct connector)

One power cord clamp bushing -

(for the cord hole in a metal upper cabinet)

our 1/4" x 2" lag screws -

(for wall stud holes)

Two 1/4" x 2" bolts -

(for securing to the upper cabinet)

One lock pin and one washer-

Four 1/4" x 3" toggle bolts -

(for drywall holes)

Four spring toggle heads -

(for the toggle bolts)

Two washers -

(for the two upper cabinet bolts)

NOTE: Install at least two lag screws into one 2” X 4” stud and four anchor bolts into the wall.

The mounting area must meet the 150 lbs. weight requirement.

Tools and materials required for installation: List of tools include: Stud finder or thin nail, Saber saw, Keyhole saw, Electric drill, Phillips and Flat blade

screwdriver, Pencil, Tape measure (metal), Plumb line, Tin snips, Caulking gun, Duct tape, Clear tape, Wood and Metal drill bits.

NOTE: Use the carton or heavy material for covering the counter top.

NOTE: Ductwork required for installation is not included. All wall and roof cap s must have a back-draf t damper.

Installation Instruction

Upper

Roof Venting

Roof cap

WallVenting

Elbow

Preparing Electrical Connection

WARNING

To avoid risk of electrical shock, this appliance must be grounded.

1. Locate grounded electrical outlet for oven in the cabinet above the oven.

NOTE: Outlet should be on a circuit dedicated to the

microwave oven (120 V AC, 60 Hz) with a 20 Amp fused electrical supply.

NOTE: If proper wall outlet is not present, one must be

installed by a qualified electrician.

2. Power supply cord hole will be cut later when preparing the wall and upper cabinet.

Cabinet

Ground edOutlet (inside upper cabine

ower Supply Cord Hole

Roof cap

3 1/4"x10"

duct

Roof venting

duct transition

Diameter

round duct

1/4" toround

Through-the-roof

Wall Venting

Oven is located on an outside wall of house.

NOTE: Do not use extension cord. Keep power cord dry

and do not pinch or crush.

Preparing Venting System

Oven may be vented in one of three ways. NOTE: Do not vent oven into a wall cavity, an attic or an

unused area.

WARNING

To avoid risk of fire, personal injury or property damage, oven must be properly vented.

NOTE: Duckwork needed for outside ventilation is not

included with oven.

Roof-Venting

Oven is located on an outside wall near roof.

Wall venting

1/4" toround

duct transition

31/4"x10"

duct

Wall cap

Through-the-wa

Wall ca

Installation Instruction

Room Venting

For 3 1/4"x10" Syste m s

For 6" Round Systems

. . . . .

Room Venting

Oven is located on an inside wall of house.

NOTE: Remember the following when installing venting.

• Keep length of ductwork and the number of elbows to a minimum to ventilate oven efficiently.

• Keep the size of the ductwork the same.

• Do not install two elbows together .

• Use duct tape to seal all joints in the ductwork system.

• Use caulking to seal exterior wall or roof opening around the cap.

Standard Fittings NOTE: If existing ductwork is round, a rectangular-to-

round adapter must be used with a rectangular 3" extension duct installed between the damper assembly and adapter to prevent the exhaust damper from sticking.

To calculate the equivalent length of each duct piece used, see examples below.

3 1/4"x10"

90 elbow

1-31/4"x10"90 elbow 1-Wall Cap 8 feet straight duct

Total Length

transition

1-transition 2-90 elbows 1-Wall Ca p 8 feet straig ht Total Length

2ft.

6ft.

6ft.90 elbows

wall cap

= 25 ft. = 40 ft. = 8 ft. = 73 ft.

wall cap

=5ft =20ft =40ft =8ft =73ft

Ductwork Length

The total length of the ductwork system, including straight duct, elbows, transitions, and wall or roof cap must not exceed the equivalent of 140 feet.

For best performance, do not use more than three 90° elbows and keep the length as short as possible.

Following are standard fittings and their equivalent length in feet.

3 1/4"x10"

to 6"=5ft.

4567

90 elbow

=10ft.

3 1/4"x10" roof

31/4"x10"

wall cap

=40ft.

cap=24ft.

45 elbow

=5ft.

31/4"x10"90

elbow=25ft.

3 1/4"x10"

flat elbow

=10ft.

Installation Instruction

Replace screws

Preparing Venting Blower

WARNING

To avoid risk of electrical shock or personal injury , disconnect power to unit before working on vent blower.

NOTE: Do not pull or stretch blower wiring. Pulling or

stretching blower wiring could result in electrical wiring damage.

Microwave oven is shipped with blower assembly for roof venting. If wall or room venting installation is desired, blower assembly must be changed.

1. Remove screws securing mounting plate to oven cabinet and set side.

2. Replace screws back into oven cabinet.

Blowe unit

Exhaust ports

5. Reconnect blower motor terminal plug, making sure the wire is under the supporter.

Support

Blower wire

into cabinet.

Remove mounting plate.

Roof Venting Installation

Blower venting is assembled at the factory for roof venting. Proceed to “Wall and Upper Cabinet Installation” section.

Wall Venting Installation

1. Remove blower unit mounting screw and blower plate screws (save screws for step 8). Remove blower plate from cabinet.

Blower

plate

6. Place blower unit back into cabinet. V erify exhaust ports face towards the rear and are aligned with the holes in the back of the unit.

Exhaust

ports

7. Remove knockouts marked B (see step 1 for illustration) from back plate and discard. Be careful not to distort back plate.

8. Attach blower plate to cabinet with exhaust ports and blower plate opening aligned. Secure blower unit with screws that were removed in step 1.

Room Venting Inst allation (Recirculating)

1. Remove blower unit mounting screw and blower plate screws (save screws for step 5). Remove blower plate from cabinet.

lower

unit

Blower

plate

Blower unit

mounting screw

lower

unit

2. Carefully lift blower unit out of oven cabinet.

3. Disconnect blower motor terminal plug from wire harness.

Blower unit

mounting screw

4. Rotate blower unit so exhaust ports face the rear of the cabinet.

2. Carefully lift blower unit out of oven cabinet.

3. Rotate blower unit 90° so that exhaust ports face the front of the cabinet.

Installation Instruction

A thick, protective

4. Place blower unit back into cabinet. Verify exhaust ports face towards the front of the unit.

5. Attach blower plate to cabinet. Secure blower unit with screws that were removed in step 1.

Preparing Wall and Upper Cabinet

CAUTION

To avoid property damage cover countertop or cooktop by placing a piece of cardboard from the carton or a heavy piece of material. Do not use plastic.

• Remove shipping material and parts from inside the

microwave oven.

• Cover countertop or cooktop with a thick protective

covering, to protect it from damage and dirt.

covering

2. Find and mark placement of one or two points indicating stud location on the wall.

• Measure and mark stud location within the area

marked H on the wall template.

• If wall studs cannot be located, consult a local

building contractor.

WARNING

To avoid risk of property damage or personal injury, do not attempt to install microwave oven if wall studs cannot be located.

3. Align plumb line on wall with center line on the wall template.

• Verify minimum width is 30" and the distance from

the top of wall template to the range or countertop is at least 30".

4. Secure wall template to the wall.

• If cabinets are not level, adjust the wall template

to align with cabinet.

• Oven must hang level. If the front edge of the

cabinet is lower than the back edge, adjust wall template to be level with the cabinet front.

NOTE: For easy access to wall and upper cabinet,

remove range from wall to allow easier measuring and drilling.

Preparing Template Placement

1. Find and mark the vertical center line on the back wall, using a tape measure and plumb line.

Upper cabinet template

Wall template

5. Measure the bottom of the upper cabinet frame. Trim the edges A, B, and C on the upper cabinet template, so template will fit on the bottom of the upper cabinet. If upper cabinet has a recessed frame, trim the template to fit inside the recessed area. Align the centerline of the upper cabinet template with the centerline on the wall template. Secure upper cabinet template in place.

Installation Instruction

Filler block Cabinet

Mounting plate

Spring

Support tabs

Drilling Holes in the Wall and Upper Cabinet

WARNING

To avoid electrical shock or personal injury , be very careful when drilling holes into the wall. Electrical wires may be concealed behind the wall covering.

1. Find the points on the wall template labeled D, E, F, and G. Drill a 3/16" diameter hole at any points located over a wall stud. Drill 3/4" diameter hole at any point over the wall without studding.

2. Drill holes into studded areas marked H and I on the wall template using a 3/16" drill bit. If wall studs are not located within these areas, drill 3/4" holes nearest to the center of the areas as possible.

NOTE: If there are no wall studs within the areas

marked H and I, or behind points marked D, E, F, and G, do not install microwave oven. (Consult a building inspector.) There must be at least one wall stud in the marked areas.

3. Drill a 3/8" hole at points J, K, and N on upper cabinet template.

NOTE: If the bottom of the cabinet is recessed 3/4" or

more, filler block (not included) will be required to provide additional support for the bolts.

abinet front

bottom she

4. Cut or drill a 2" hole at the area marked M, for power cord access into upper cabinet.

NOTE: If upper cabinet is metal, cover the edges of the

hole to prevent damage to the power cord.

WARNING

To avoid electrical shock or personal injury, cover edges on metal cabinet to prevent damage to power cord.

5. Cut out the venting area required for installation.

• Roof vented: Cut out shaded area marked L on

the upper cabinet template.

• Wall vented: Cut out shaded area marked O on

the wall template.

• Room vented: Proceed to “Installing Mounting

Plate” section.

6. Use caulking compound to seal the exterior wall or roof opening around the wall or roof cap.

Installing Mounting Plate

1. Remove templates from wall and upper cabinet.

Damper must be on top of

tab for properventing.

• Mark the center of each filler block needed and drill a 3/8" hole through the block.

• Align the filler blocks with openings in the top of the microwave oven cabinet and attach to the cabinet with tape.

Fille

bloc

NOTE: If venting through the wall, verify alignment of

damper on the rear of the mounting plate moves freely.

2. Place toggle bolts through mounting plate holes where 3/4" holes were drilled. Attach spring toggle head on each toggle bolt.

toggle hea

Mounting p late

oggle bolt

3. Place mounting plate against the wall aligning toggle bolts with holes.

Installation Instruction

Mounting pate

NOTE: Leave at least the wall thickness of space to

allow spring toggle head to open once placed into the wall.

Spring

oggle bolt

Mounting plate

4. Locate wall stud holes and insert lag screws through mounting plate and into 3/16" holes, do not tighten .

5. Insert toggle bolts through wall surface and tighten. Tighten lag screws at this point also.

6. Slide washer onto the lock pin and place inside the upper cabinet for further use.

Wall

ag screw

toggle h ead

Power cord

Power cor hole

2. Rotate the microwave upward until oven is against the bottom of the upper cabinet or cabinet frame.

3. Drop the lock pin and washer assembly into hole N, and push the pin downward as far as it will go.

Washer

Lock pin

ock pin

Wash

Attaching Oven to the W all

WARNING

This unit is an excessive weight hazard, which can cause personal injury or property damage. T wo or more people are required to lift unit. To prevent injury or property damage, use proper lifting and carrying techniques when moving unit.

1. Carefully lift microwave oven and hang it on support tabs at the bottom of the mounting plate. Reaching through upper cabinet, thread power supply cord through cutout in the bottom of the upper cabinet.

4. Insert 3" X 1/4" bolts and washers down into holes J and K. Tighten the bolts until the gap between the microwave and cabinet has closed.

5. Remove the lock pin and washer. If wall or roof venting installation is used, skip to step 8.

Installation Instruction

r y

6. Roof-vented installation: Align the damper/duct connector with the vent on top of the microwave oven. Damper should be on top of tab. Use two tapping screws (bright-colored) to attach damper/ duct connector to the microwave oven.

damper

NOTE: Damper/duct connector must be attached to

microwave oven after microwave oven is installed.

7. Roof venting installation: Install ductwork through the vent opening in the upper cabinet. Complete the venting system through the roof according to the method needed. See, Preparing Venting System section. Use caulking to seal the exterior roof opening around the exhaust cap.

8. Use the power supply cord clamp to bundle the power supply cord. Install the power supply cord clamp inside the cabinet.

9. Grasp filter screen with one hand holding the ring and the other hand holding the opposite end. Insert the end of the filter screen without ring into the opening and slide towards the side of the microwave oven. Insert ring end of filter screen into the opening and slide entire screen towards the center of the microwave until screen is securely in position. Repeat for other filter screen.

10.Plug in the power supply cord.

duct

powe suppl cord clamp

Installation Instruction

This page intentionally left blank.

Appendix B

Care and Cleaning

For best performance and safety, keep the oven clean inside and outside. Take special care to keep the inner door panel and the oven front frame free of food or grease build-up.

Never use abrasive cleaners or pads. Wipe the microwave oven inside and out, including the hood bottom cover, with a soft cloth and a warm (not hot) mild detergent solution. Then rinse and wipe dry . Use a chrome cleaner and polish on chrome, metal, and aluminum surfaces. Wipe spatters immediately with a wet paper towel, especially after cooking chicken or bacon. Clean your oven weekly or more often, if needed.

Cleaning the Grease Filters

The grease filters should be removed and cleaned often, at least once a month.

1. To remove grease filters, slide each filter to the side. Pull filters downward and push to the other side. The filter will drop out.

3. To reinstall the filters, slide it into the side slot, then push up and toward oven center to lock.

CAUTION

To avoid risk of property damage, do not operate the hood vent system without the filters in place.

2. Wash in dishwasher or soak grease filters in hot water and a mild detergent. Rinse well and shake to dry. Do not use ammonia. The ammonia will darken the filter.

Charcoal Filter Replacement

If the oven is vented inside the room, the charcoal filter should be replaced every 6 to 12 months, and more often if necessary. The charcoal filter cannot be cleaned. To order a new charcoal filter, contact the Parts Department at your nearest Authorized Service Center. Order Charcoal Filter Kit #: MVHRK3.

1. Disconnect power to oven.

2. Remove the two vent grille mounting screws. (2 middle screws)

3. Tip the grille forward, then lift out.

Care and Cleaning

4. Remove old filter.

5. Slide new charcoal filter into place. The filter should rest at the angle shown.

6. Slide the bottom of the vent cover into place. Push the top until it snaps into place. Replace the mounting screws. T urn the power back on and set the clock.

Oven Light Replacement

1. Unplug oven or turn off power at the main power supply.

2. Remove the vent cover mounting screws. (2 middle screws)

3. Tip the cover forward, then lift out to remove.

4. Remove bulb holder mounting screw .

Cooktop/Night Light Replacement

1. Unplug the oven or turn off power at the main power supply.

2. Remove the bulb cover mounting screws.

3. Replace bulb(s) with 30 or 40 watt appliance bulb(s).

4. Replace bulb cover.

5. Turn the power back on at the main power supply.

5. Lift up the bulb holder.

6. Replace bulb with a 30 or 40 watt appliance bulb.

7. Replace the bulb holder and mounting screw.

8. Slide the bottom of the vent cover into place. Push the top until it snaps into place. Replace the mounting screws. Turn the power back on at the main power supply .

Maytag ACO1520AC, ACO1560AW, ACO1840AB, ACO1530AW, ACO1560AB User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual