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

...

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.

+ 30 hidden pages