Amana Menumaster JBH202 Service Manual

Service

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

Commercial Combination/

MENUMASTER

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

This Base Manual covers general information

Refer to individual Technical Sheet

for information on specific models

This manual includes, but is

not limited to the following:

Convection Microwave Oven

60 HZ Models

AMH20 P1330801M AMH202 P1331101M AMH20D P1332501M JBH202 P1331102M SZH20 P1331104M

50 HZ Models

AMH20A2 P1331103M AMH20AD2 P1332504M

P1332506M

MMH20AD2 P1332505M

P1332507M

16023463

November 2006

Important Information

Important Notices for Servicers and Consumers

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

APPROPRIATE SERVICE INFORMATION BEFORE BEGINNING REPAIRS.

To avoid risk of severe personal injury or death, disconnect power before working/servicing on appliance to avoid electrical shock.

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

WARNING

Service Support Center

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

Recognize Safety Symbols, Words, and Labels

DANGER!

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

WARNING!

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

CAUTION!

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

damage.

Table of Contents

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

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

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

Servicing of Grounded Products ................................. 8

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

Proper Grounding and Polarization of

208/230 Volts Wall Outlets ..................................... 8

Explanation ............................................................... 8

Test Procedures (2 Methods) ..................................... 8

General Test Information ............................................ 8

General Information

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

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

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

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

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

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

Troubleshooting Procedures .................................. 10-15

Component Testing Procedures ............................. 16-19

Power Test .................................................................. 20

Convection Temperature Test and Calibration ............. 21

Display Diagnostic ...................................................... 22

Service Test ................................................................ 23

Service Functions .................................................. 24-25

Disassembly Procedures

Door Handle ............................................................ 26

Magnetic Door Stop ................................................. 26

Outer Door .............................................................. 26

Inner Door Assembly ............................................... 26

Hinge ....................................................................... 26

Outer Case .............................................................. 27

Back Panel .............................................................. 27

Interlock Switch Module ........................................... 27

Stirrer Motor and Antenna Gears ............................. 27

RTD (Resistance Thermal Device) .......................... 28

Top Touch Panel Assembly ...................................... 28

Side Touch Panel Assembly .................................... 28

Display Module ........................................................ 28

Heating Elements (oven top) .................................... 28

Inlet Duct Assembly ................................................. 28

Halfwave Board ....................................................... 28

Control Board Assembly Bracket ............................. 29

High Voltage Circuit Board ...................................... 29

Auto Transformer..................................................... 29

Triacs ...................................................................... 29

Power Relay ............................................................ 29

Convection Motor Capacitor .................................... 29

Magnetron ............................................................... 29

Magnetron, Control, and Fan

Thermal Cutouts (TCO) ........................................ 30

Blower Bracket Assembly ........................................ 30

Microwave Blower Wheel and Motor ....................... 30

Fan Blade ................................................................ 30

Transformer ............................................................. 30

Capacitor / Diode .................................................... 31

Convection Box ....................................................... 31

Convection Element ................................................. 31

Thermal Limiter ........................................................ 31

Plenum Box ............................................................. 31

Fuse ........................................................................ 31

Power Cord ............................................................. 31

Component Location ........................................... 32-34

Appendix A

Owner’s Manual............................................. A-2-A-16

Appendix B

Quick Reference Guide .................................... B-2-B3

Important Safety Information

WARNING

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

The basic design of the Amana 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 Radarange 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 Amana Manufacturing

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 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. Always remember that in the area of the transformer there is HIGH VOLTAGE. When the unit is operating keep this area clear 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 not valid reason for this action at any time; nor will it be condoned by Amana.

9. IMPORTANT: Before returning a unit to a customer, be sure to check for proper switch interlock action.

10. Before returning a unit to a customer, be sure that the door spacing is reasonably uniform along the top, bottom, and sides, and that it measure 1/8" (3 mm) or less.

11. The Amana Microwave Oven should never be operated with any components removed and/or bypassed or when any of the safety interlocks are found to be defective, or when any of the seal surfaces are defective, missing, or damaged.

12. All Amana Microwave Ovens meet all requirements of the radiation control for Health and Safety Act of 1968. Due to measurement uncertainties, the maximum leakage for the field will be 4mw/cm

13. To ensure that the unit does not emit excessive microwave leakage and to meet the Department of Health and Human Services guidelines, check the oven for microwave leakage using the Holaday HI1510, HI1501, or HI1710 leakage monitor as outlined in the instruction. The maximum leakage level allowed when following those instructions is 4mw/cm2.

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

Important Safety Information

Recognize this symbol as a SAFETY message

WARNING

When using electrical equipment, basic safety precautions should be followed to reduce the risk of burns, electrical shock, fire, or injury to persons.

1. READ all instructions before using equipment.

2. READ AND FOLLOW the specific

“PRECAUTIONS TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY”.

3. This equipment MUST BE GROUNDED. Connect

only to properly GROUNDED outlet. See “GROUNDING INSTRUCTIONS”.

4. Install or locate this equipment ONLY in

accordance with the installation instructions in this manual.

5. Some products such as whole eggs and sealed containers, for example, closed glass jars may explode and SHOULD NOT be HEATED in this oven.

6. Use this equipment ONLY for its intended use as described in this manual. Do not use corrosive chemicals or vapors in this equipment. This type of oven is specifically designed to heat or cook. It is not designed for industrial or laboratory use.

7. As with any equipment, CLOSE SUPERVISION is necessary when used by CHILDREN.

8. DO NOT operate this equipment if it has a

damaged cord or plug, if it is not working properly, or if it has been damaged or dropped.

9. This equipment, including power cord, must be

serviced ONLY by qualified service personnel. Special tools are required to service equipment. Contact nearest authorized service facility for examination, repair, or adjustment.

10. DO NOT cover or block filter or other openings

on equipment.

11. DO NOT store this equipment outdoors. DO NOT use this product near water, for example, near a kitchen sink, in a wet basement, or near a swimming pool, and the like.

12. DO NOT immerse cord or plug in water.

13. Keep cord AWAY from HEATED surfaces.

14. DO NOT let cord hang over edge of table or counter.

15. See door cleaning instructions in “Care and Cleaning” section.

16. For commercial use only.

CAUTION

To reduce risk of fire in the oven cavity:

a. DO NOT overcook food. Carefully attend

equipment if paper, plastic, or other combustible materials are placed inside the oven to facilitate cooking.

b. Remove wire twist-ties from paper or plastic

bags before placing bag in oven.

c. KEEP oven DOOR CLOSED, turn oven off, and

disconnect the power cord, or shut off power at the fuse or circuit breaker panel, if materials inside the oven should ignite. Fire may spread if door is opened.

d. DO NOT use the cavity for storage. DO NOT

leave paper products, cooking utensils, or food in oven.

SAVE THESE INSTRUCTIONS

Important Safety Information

CAUTION

To avoid risk of personal injury or property damage, observe the following:

1. Briskly stir or pour liquids before heating with microwave energy to prevent spontaneous boiling or eruption. Do not overheat. If air is not mixed into a liquid, liquid can erupt in oven or after removal from oven.

2. Do not deep fat fry in oven. Fat could overheat and be hazardous to handle.

3. Do not cook or reheat eggs in shell or with an unbroken yolk using microwave energy. Pressure may build up and erupt. Pierce yolk with fork or knife before cooking.

4. Pierce skin of potatoes, tomatoes, and similar foods before cooking with microwave energy. When skin is pierced, steam escapes evenly.

5. Do not operate equipment without load or food in oven cavity.

6. Use only popcorn in packages designed and labeled for microwave use. Popping time varies depending on oven wattage. Do not continue to heat after popping has stopped. Popcorn will scorch or burn. Do not leave oven unattended.

7. Do not use regular cooking thermometers in oven. Most cooking thermometers contain mercury and may cause an electrical arc, malfunction, or damage to oven.

8. Do not heat baby bottles in oven.

9. Do not use metal utensils in oven.

10. Never use paper, plastic, or other combustible materials that are not intended for cooking.

11. When cooking with paper, plastic, or other combustible materials, follow manufacturer's recommendations on product use.

12. Do not use paper towels which contain nylon or other synthetic fibers. Heated synthetics could melt and cause paper to ignite.

13. Do not heat sealed containers or plastic bags in oven. Food or liquid could expand quickly and cause container or bag to break. Pierce or open container or bag before heating.

14. To avoid pacemaker malfunction, consult physician or pacemaker manufacturer about effects of microwave energy on pacemaker.

PRECAUTIONS TO AVOID POSSIBLE EXPOSURE

TO EXCESSIVE MICROWAVE ENERGY

a. DO NOT attempt to operate this oven with the

door open since open-door operation can result in harmful exposure to microwave energy. It is important not to defeat or tamper with the safety interlocks.

b. DO NOT place any object between the oven front

face and the door or allow soil or cleaner residue to accumulate on sealing surfaces.

c. DO NOT operate the oven if it is damaged. It

is particularly important that the oven door close properly and that there is no damage to the: (1) door (bent), (2) hinges and latches (broken or loosened), (3) door seals and sealing surfaces.

d. The oven should NOT be adjusted or repaired

by anyone except properly qualified service personnel.

SAVE THESE INSTRUCTIONS

Important Safety Information

WARNING

Precautions to be observed before and during servicing to avoid possible exposure to excessive microwave energy, or electrical shock disconnect power to oven.

• Do not operate or allow oven to be operated with door open.

• 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

• Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity, and connections.

• 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.

• 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 properly grounded three prong wall receptacle installed in accordance with appropriate electrical codes.

WARNING

To avoid the risk of electrical shock or death, do not alter the plug.

WARNING

To avoid the risk of electrical shock or death, this equipment must be grounded.

This equipment MUST be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. This oven is equipped with a cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is properly installed and grounded.

Consult a qualified electrician or servicer if grounding instructions are not completely understood, or if doubt exists as to whether the equipment is properly grounded.

Do not use an extension cord. If the product power cord is too short, have a qualified electrician install a threeslot receptacle. This oven should be plugged into a separate 50 or 60 hertz circuit with the electrical rating as shown in the appropriate drawing. Models operate with a 208 or 230 supply voltage. When an oven is on a circuit with other equipment, an increase in cooking times may be required and fuses can be blown.

Important Safety Information

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

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

WARNING

To avoid risk of electrical shock, personal injury or death; verify the oven is properly grounded and polarized.

Explanation

Polarization–This means that the larger slot must be

neutral and the small slot must be hot (live). Mispolarized–The outlet is miswired so that the larger slot is hot (live) and the smaller slot is neutral. Grounded–This means the round hole connection is connected to earth ground through a connection to the main power panel. Ungrounded–The round hole connection is not complete to earth ground and/or the main power panel.

CAUTION

To avoid risk of electrical shock, personal injury or property damage; wiring changes or grounding of wall outlet are to be made only by a qualified electrician.

General Test Information

Most testing in the manual is conducted with an ohmmeter using a multiplier scale of X 10k (k–thousand ohms). When using this scale, it is important that your fingers do not touch the metal parts of the test probes. To do so will give a false indication of the ohm reading.

Proper Grounding and Polarization of 208/230 Volts Wall Outlets

For the safety of our customers and the service technician ALL appliances have a three–prong power cord and MUST be connected to a properly polarized and grounded wall outlet.

This information was written for those who do not understand grounding and polarization of a wall outlet.

A 208/230 volt wall outlet must always be wired as shown below.

Neutral (N) - This slot is the larger of the two and should be neutral (dead) with respect to ground.

Ground (G) - The round hole connection is for the grounding circuit. Behind the cover plate a green wire should be connected to this terminal.

Hot (H) - This slot is the smaller size and should always be hot (live) with respect to neutral (N) and ground(G).

General Information

Unpacking Equipment

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

• Report any dents or breakage to source of purchase immediately. Do not attempt to use oven if

damaged.

• Remove all packing materials from oven interior.

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

Equipment Placement

• Recommended countertop surface depth is 26” (66 cm).

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

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

• Install oven on level countertop surface.

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

Radio Interference

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

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

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

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

Model Identification

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

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

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

Service

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

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

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

Parts and Accessories

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

A—Allow at least 2" (5 cm) of clearance around top, back and

sides of oven. Proper air flow around oven cools electrical components. With restricted air flow, oven may not operate

properly and life of electrical parts is reduced. B—Install combination oven so oven bottom is at least 3 feet (91 cm) above floor.

60 Hz Troubleshooting Procedures

)

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Stand By Condition

(230)

(208)

(230)

(208 )

208/ 230V 60H Z

J1-2

J2-5

J3-3

J3-1

J2-3

J2-3NOJ2-3

J2-4

J4-6

J4-7

J4-1

J4-2

J4-3

J4-4

MAG 2

TCO

360 ½ W RESIS TOR

POW ER BOAR D

J8-1

J8-2

J8-3

RAD IANT HEATE R

(LH)

POWER R

ELAY COIL

E1 E2 /E3

CURR ENT

SENS E

J8-4 J 8-6

CONT ROL

TCO

MAG 1 TCO

230

L2L2

L2GNDL1

CONV ECTION FAN

CAPACI TOR

CONV ECTION HEATER

(REAR )

RADIA NT HEATE R

(RH)

7 8

INTE RLOCK (MO NITOR)

POWE R TRAN SFORM ER

208

J8-7

RTD

DATA KEY

BOAR D

SHIEL DED

CAB LE

HAL FWAVE

PROT ECTION

BOAR D

RLY1 R LY2

UTO TR ANSFO RMER

208 120

CONTROL/TEMPERATURE

CONVECTION (FUSE 2

MICROWAVE (FUSE 1

UPPE R

SWITC H

DISP LAY

BOAR D

LOW ER

SWITC H

RLY1

RLY2

TRIAC (TR1)

BLOW ER

(RIGH T)

COM230

TRIA C (TR2)

HEATER

(MIDD LE)

TRIA C (TR3) MAGN ETRON

(LEFT )

COM

J1-4 J1- 2 J1-1

J2-1J2-2J2-4

J1-3

J1-1

J7-5

J7-6 J7-5

SNU BBER

COO LING FAN

STIR RER

J7-4 J7-3

J7-3

SNU BBER

J7-2 J7-1

J7-1

SNU BBER

DOO R

INTE RLOCK

(PRI MARY)

POWE R

BOA RD

T1T2

POWE R BOA RD

(SEC ONDAR Y)

POWE R BOA RD

SPEA KER

BOA RD

INTE RLOCK

SCHEM ATIC CO NDITIO N: DOO R CLOSE D

25A

TEM P LIMITE R

25A MAG FUSE 1

J1-1

POWER

RELAY

J2-1

J2-2

J4-5

HEATER

FUS E 2

POWE R BOAR D

CAUTION:

DO NOT REMOVE WIRE FROM TRIAC TERMINAL T2 DURING TESTING. THIS WILL CAUSE HV BOARD TO SHORT OUT.

INTER LOCK S WITCH SCHEMATI C

DOOR CLOSE D

3 SEC ONDAR Y

5 PRI MARY

8 M ONITOR

REAR

MAG NETRON 2

REC TIFIERS

FRON T

MAGN ETRON 1

DANGER

HIGH VOLTAGE

60 Hz Troubleshooting Procedures

)

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Pre-Heat Condition

(230)

(208)

(230)

(208)

208/ 230V 60H Z

J1-2

J2-5

J3-3

J3-1

J2-3

J2-4

J4-6

J4-7

J4-1

J4-2

J4-3

J4-4

MAG 2

TCO

360 ½ W RESI STOR

RADIA NT HEATE R

POW

POWE R BOAR D

J8-1

J8-2

J8-3

(LH)

R RELAY COI

230

E1 E2 /E3

CURR ENT

SENS E

J8-4 J 8-6

CONT ROL

TCO

MAG 1 TCO

208

L2GNDL1

J8-7

CONV ECTIO N FAN

CAPACI TOR

CONV ECTION HEATER

(REAR)

RAD IANT HEAT ER

(RH)

7 8

INTER LOCK (MO NITOR)

POWE R TRAN SFORM ER

RTD

DATA KEY

SHIE LDED

CAB LE

208 120

CONTROL/TEMPERATURE

CONVECTION (FUSE 2

MICROWAVE (FUSE 1

P1P

BOA RD

HALF WAVE

PROT ECTION

BOA RD

RLY1 R LY2

UTO TR ANSFO RMER

RLY1

RLY2

UPPE R

SWITC H

DISPL AY

LOW ER

SWITC H

TRIAC (TR1)

BLOW ER

(RIGH T)

TRIA C (TR2 )

HEATER

(MIDD LE)

TRIA C (TR3 )

MAGN ETRON

(LEFT )

COM

BOA RD

COM230

J1-4 J 1-2 J1-1

J2-1J2-2J2-4

J1-3

J1-1

J7-6 J7-5

J7-5

SNU BBER

COO LING FAN

J7-4 J7-3

J7-3

SNUB BER

J7-2 J7-1

J7-1

SNU BBER

DOOR

INTE RLOCK

(PRIM ARY)

T1T2

STIR RER

(SECO NDARY )

SPEA KER

BOAR D

POW ER

BOAR D

POW ER BOAR D

INTER LOCK

POW ER BOAR D

SCH EMATIC CO NDITIO N: DOO R CLOSE D

25A

TEM P

LIMITE R

25A MAG FUSE 1

J1-1

POWER

RELAY

J2-1

J2-2

J4-5

HEATER

FUS E 2

POWE R BOAR D

CAUTION:

DO NOT REMOVE WIRE FROM TRIAC TERMINAL T2 DURING TESTING. THIS WILL CAUSE HV BOARD TO SHORT OUT.

INTER LOCK S WITCH S CHEMAT IC

DOO R CLOSE D

3 SEC ONDAR Y

5 PRI MARY

8 MO NITOR

REAR

MAGN ETRON 2

REC TIFIERS

FRON T

MAG NETRON 1

DANGER

HIGH VOLTAGE

60 Hz Troubleshooting Procedures

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Cook Condition

SCHE MATIC CO NDITIO N: DOO R CLOSE D

25A

FUSE 2

TEMP LIMITE R

25A MAG FUSE 1

J1-1

POWER

RELAY

J2-1

J2-2

J4-5

HEATER

POWE R BOAR D

(230)

(208 )

208/2 30V 60H Z

L2GNDL1

CONTROL/TEMPERATURE

CONVECTION (FUSE 2)

MICROWAVE (FUSE 1)

RLY1

RLY2

UPP ER

SWITC H

LOW ER

SWITC H

TRIA C (TR2)

(MIDD LE)

TRIA C (TR3)

MAGN ETRON

COM

DISPL AY BOAR D

TRIAC (TR1)

BLOW ER (RIGH T)

COM230

HEATER

(LEF T)

J1-4 J1- 2 J1-1

J7-6 J 7-5

SNU BBER

J7-4 J 7-3

SNU BBER

J7-2 J 7-1

SNU BBER

J2-1J 2-2J2-4

J1-3

J1-1

INTE RLOCK

(PRI MARY)

J7-5

COO LING FAN

STIR RER

J7-3

J7-1

SPEA KER

BOA RD

DOO R

POW ER BOAR D

T1T2

POW ER BOAR D

INTE RLOCK

(SECO NDARY )

POW ER BOAR D

DATA KEY

POWE R BOAR D

J8-1

J8-2

MAG 2

TCO

360 ½ W RESIS TOR

J8-3

RADIA NT HEATE R

POWER REL

J1-2

J2-5

(208 )

J3-3

J3-1

J2-3

J2-4

J4-6

J4-7

J4-1

J4-2

J4-3

J4-4

J8-4 J8-6

MAG 1

TCO

(LH)

Y COI

230

E1 E2/E3

CONT ROL

TCO

CURR ENT

SENS E

208

CONV ECTION FAN

CAPACI TOR

CONV ECTION HEATER

(REAR )

RADIA NT HEATE R

(RH)

7 8

INTE RLOCK

(MON ITOR)

POWE R TRANS FORM ER

J8-7

RTD

SHIEL DED

CAB LE

BOAR D

HALF WAVE

PROT ECTION

BOAR D

RLY1 RLY2

UTO TR ANSFO RMER

208 120

CAUTION:

DO NOT REMOVE WIRE FROM TRIAC TERMINAL T2 DURING TESTING. THIS WILL CAUSE HV BOARD TO SHORT OUT.

INTER LOCK S WITCH SCHEMAT IC

DOO R CLOSE D

3 SE CONDAR Y

5 PRI MARY

8 MO NITOR

DANGER

HIGH VOLTAGE

50 Hz Troubleshooting Procedures

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

WARNING

Stand-By Condition

50 Hz Troubleshooting Procedures

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

WARNING

Pre Heat Condition

50 Hz Troubleshooting Procedures

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

WARNING

Cook Condition

Component Testing Procedures

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Illustration Component Test Results

Thermal cutout Disconnect all wires from TCO.

Diode Discharge Capacitor

Triac Disconnect wires to triac.

MT2

MT1 GATE

Triac 1 (top) is for front element. Triac 2 (middle) is for rear element.

60 HZ Models only

Capacitor Discharge Capacitor

Snubber assembly Disconnect wires to snubber.

Magnetron Discharge Capacitor

Microwave blower motor

Measure resistance across terminals.

Control TCO ...............................................

Magnetron TCO..........................................

Remove diode lead from capacitor and connect ohmmeter. Reverse leads for second test.

Measure resistance from:

MT1 to MT2................................................

MT1 to Gate ...............................................

MT2 to Gate ...............................................

All terminals to ground................................

Measure voltage from MT1 to Gate ...............

Remove wires from capacitor terminals and connect ohmmeter, set on highest resistance scale to terminals.

Also check between each terminal and

capacitor case................................................

Measure resistance across terminals.............

Remove wires from magnetron and connect ohmmeter to terminals. Also check between each terminal and ground.

Remove all wires from motor.

Measure resistance across coil......................

Closed at 113° C (235° F) and open at 66° C (150° F). Open at 149° C (300° F) and closed at 125° C (257° F). Infinite resistance should be measured in one direction and 50K or more in the opposite direction. NOTE: Ohmmeter must contain a battery of 6 volts minimum.

Caution - Do not operate oven with wire to terminal MT2 removed.

Infinite. Approximately 15 , then reverse meter leads 30 . Infinite. Infinite.

0.8 VAC when energized. If no voltage, check H.V. board and wiring.

Between Terminals: Meter should momentarily deflect towards zero then return to over 5 M . If no deflection occurs, or if continuous deflection occurs, replace capacitor. Terminal to Case: Infinite resistance.

Infinite. Between Terminals: Less than 1 .

Each terminal to ground measures Infinite resistance. NOTE: This test is not conclusive. If oven does not heat and all other components test good, replace the magnetron and retest.

Approximately 26 .

50 HZ Models only

Microwave blower motor

Stirrer motor Remove all wires from terminals.

EZCard Harness Test continuity of wires .................................. Continuity.

EZCard Board Insert EZCard to determine if unit can be

HV board to display module wiring harness

Remove all wires from motor.

Measure resistance across coil......................

Measure resistance from terminal to

terminal..........................................................

programmed .................................................. If unit can not be programmed, verify

Test resistance of wires ................................. Continuity.

Approximately 33.5 .

Approximately 29K .

EZCard harness is good. If harness is good, replace EZCard Board.

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