Amana Menumaster JET19B Service Manual

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SERVICE/TRAINING MANUAL

FEATURES &

OVERVIEW

COMPONENT

ACCESS

SPECIFICATIONS

SERVICE TEST MODE & USER OPTIONS

INSTALLATION

POWER OUTPUT

TEST

SAFETY

WIRING INFORMATION

COMPONENT

LOCATIONS

RESOURCES

Table of Contents

FEATURES & OVERVIEW

Features & Overview 3

SPECIFICATIONS

Specifications 4

INSTALLATION

Clearances and Placement 5 Radio Interference 6 Earthing Instructions 7

SAFETY

Microwave Service 8 Discharging Capacitors 9

Microwave Emissions 10

COMPONENT LOCATIONS

Front 12 Right Side 13 Left Side 14

Bottom 15

Top 16 Door 17

COMPONENT ACCESS

Antenna/Stirrers 19 Blower Fan Motor 23 Control Board 26

Convection Fan Motor 28

Display Board 31 Fuse 32 Catalyst Assy. 33

Heater Box/Heater 35

Interlock Switch 40 Monitor Relay Board 42 Power Relay 44 RTD 46 Thermal Cutouts 47 Triacs 51

HIGH VOLTAGE COMPONENTS

Capacitors & Diodes 53 High Voltage Transformer 57 Magnetron 60

SERVICE TEST MODE & USER OPTIONS

Service Test Mode 64

User Options 65

POWER OUTPUT TEST

Power Output Test 66

WIRING INFORMATION

Diagram 67 Schematic 68

RESOURCES ACP Service Solutions 69

SPECIFICATIONS

Models JET14*

Power Source

Voltage AC 208-240 VAC 208-240 VAC 230 VAC Amperage (Single Unit) 16 A 26 A 16 A Frequency 60 Hz 60 Hz 50 Hz Single Phase, 3 wire grounded YES YES YES Receptacle 6-20R 6-30R CEE5/7 Plug 6-20P 6-30P Schuko

Power Output  Microwave

Nominal microwave energy (IEC705) 1400 Watts 1900 Watts 1400 Watts

Minimum temperature rise 14ºF / 7.5ºC 19ºF / 10.5ºC 14ºF / 7.5ºC

Power Consumption Amps 16 Amps 26 Amps 13 Amps

Watts 3200 Watts 5300 Watts 2900 Watts

Dimensions Cabinet (in / cm)

Width 19 3/4" 50 cm 19 3/4" 50 cm 19 3/4" 50 cm

Height 18 1/8" 46 cm 18 1/8" 46 cm 18 1/8" 46 cm

Depth 26 " 66 cm 26 " 66 cm 26 " 66 cm

Oven Interior (in / cm) Width 13" 33 cm 13" 33 cm 13" 33 cm

Height 10 1/2" 27 cm 10 1/2" 27 cm 10 1/2" 27 cm Depth 15" 38 cm 15" 38 cm 15" 38 cm Weight Crated 102 lbs. 46 kg. 102 lbs. 46 kg. 102 lbs. 46 kg.

Uncrated 95 lbs. 43 kg. 95 lbs. 43 kg. 95 lbs. 43 kg.

JET19*

JET514

Oven Clearances

INSTALLATION

A—For North American (UL/CSA) models, allow at least 2” (5.1 cm) of

clearance around top of oven. For International (50 Hz) models, allow at least 7” (17.8 cm) of clearance around top of oven. Proper air flow around oven cools electrical components. With restricted air flow, oven may not operate properly and life of electrical parts is

reduced.

B—Allow at least 2 9/16” (6.5 cm) between air discharge on back of oven

and back wall.

C—Allow at least 1 1/4” (3 cm) of clearance around sides of oven.

Oven Placement

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

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

• Install oven on level countertop surface.

• If provided, place warning label in a conspicuous place close to

microwave oven.

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

place.

INSTALLATION

Radio Interference

Microwave operation may cause interference to radio, television, or a similar oven. 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.

INSTALLATION

Earthing Instructions

Oven MUST be grounded.

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 oven is properly grounded.

Do not use an extension cord.

If the product power cord is too short, have a qualified electrician install a three-slot receptacle. This oven should be plugged into a separate circuit with the electrical rating as provided in product specifications. When the combination oven is on a circuit with other equipment, an increase in cooking times may be required and fuses can be blown.

External Equipotential Earthing Terminal (export only)

Equipment has secondary earthing terminal. Terminal provides external earthing connection used in addition to earthing prong on plug. Located on outside of oven back, terminal is marked with symbol shown at right.

SAFETY – MICROWAVE SERVICE

Microwave Ovens produce voltage up to -5000 volts DC!

Microwave Oven Capacitors can store high voltage even with oven unplugged!

Always discharge capacitors whenever checking high voltage components!

Always disconnect the power supply before servicing!

NEVER perform high voltage tests!

Wear appropriate eye and hand protection!

Follow safety precautions in Product and Service literature!

Test oven operation after repairs are completed!

SAFETY - DISCHARGING CAPACITORS

ALWAYS DISCHARGE CAPACITORS BY SHORTING TERMINALS USING AN INSULATED TOOL(s)

CAPACITORS CAN HOLD HIGH VOLTAGE EVEN WHEN POWER TO OVEN IS DISCONNECTED!

SAFETY – MICROWAVE EMISSIONS

FOOD AND DRUG ADMINISTRATION

DEPARTMENT OF HEALTH AND HUMAN SERVICES

SUBCHAPTER J – RADIOLOGICAL HEALTH

PART 1030 -- PERFORMANCE STANDARDS FOR MICROWAVE AND RADIO FREQUENCY EMITTING PRODUCTS

Sec. 1030.10 Microwave ovens.

. . . .

(v) One (the primary) required safety interlock shall prevent microwave radiation emission in excess of the requirement of paragraph (c)(1) of this section; the other (secondary) required safety interlock shall prevent microwave radiation emission in excess of 5 milliwatts per square centimeter at any point 5 centimeters or more from the external surface of the oven. The two required safety interlocks shall be designated as primary or secondary in the service instructions for the oven.

Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

. . . .

(e) A Microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner.

NOTE: Other Government Agencies Have Same/Similar Standards

SAFETY – MICROWAVE EMISSIONS

To ensure the unit does not emit excessive microwave leakage and meets Government Agency guidelines, check the oven for microwave leakage using the Narda model 8100, 8200 Holaday HI1500, HI1501, or Simpson 380M leakage monitor as outlined in the instructions. The maximum leakage level allowed when following those instructions is 5mw/cm2 .

Front View

Top Touch Panel

Side Touch Panel

Removable

Air Filter &

Drip Pan

Right Side View

DISPLAY BOARD

TOP

TOUCH PANEL

INTERLOCK

SWITCHES

SIDE

TOUCH PANEL

MAGNETRON

TCO

MAGNETRON

TCO

MAGNETRON

AIR

DUCT

BLOWER

HOUSING

EXHAUST

POWER

RELAY

HARNESS,

DISPLAY TO

HV BOARD

MONITOR

RELAY BOARD

TRANSFORMER

TRIACS (3)

CAPACITORS

DIODES

Left Side View

BLOWER

MOTOR

CONVECTION

MOTOR

POWER

CORD

TERMINAL

BLOCK

THERMAL

CUTOUT

ANTENNA

GEAR

ANTENNA

MOTOR

ANTENNA

GEAR

DOOR

FUSE & FUSE BLOCK

Oven/Cavity TCO

USB PORT

REMOVABLE AIR FILTER &

DRIP TRAY

Bottom View

BOTTOM ANTENNA MOTOR ACCESS PANEL

HEATER

Top View

BLOWER

MOTOR

THERMAL

CUTOUT

31866P01

REAR

ANTENNA

GEAR

ANTENNA

MOTOR

FRONT

ANTENNA

GEAR

TEMP

SENSOR

WAVEGUIDE/

CAVITY

THERMAL

CUTOUT

31866P01

WAVEGUIDE/

CAVITY

Note: Waveguide / Cavity is not replaceable

TO ACCESS INNER DOOR COMPONENTS: Remove 2 Crosshead Screws, 4 hole plugs, and 4 #15 Torx Screws (one in each corner) Then outer door can be removed from inner door panel assembly.

DOOR VIEW

LATCH ASSEMBLY

HOLE PLUG REMOVED

Screws

NOTE: If magnetized tools are not used, then it is recommended to have the door removed and lying flat, otherwise, screws may fall inside door weldment and be very difficult to retrieve.

DOOR VIEW

Two Components within the door assembly: Door Hinge Spring found on the Upper Hinge Assembly (helps keep door open for easier food removal) and the Door Latch Assembly

DOOR SPRING

Mounting Screws

Upper Hinge Spring

DOOR LATCH ASSEMBLY

ANTENNA COVER

RETAINING CLIP (4)

ANTENNA COVER

(Ceramic)

Remove the four retainer clips while supporting the antenna cover

OVEN EXHAUST (2)

ANTENNA/STIRRER – ACCESS

RACK

CONVECTION FAN AIR INLET

OVEN TEMP SENSOR

RTD

ANTENNA/STIRRER – Inside Cavity with Cover Removed

FRONT ANTENNA

REAR ANTENNA

Note the positioning. Antennas Should NEVER be in line with each other

ANTENNA MOTOR – TESTING/REMOVAL

Terminal to Terminal - Approx. 12,000Ω

Disconnect wiring and

remove three securing screws

and lift off Antenna Motor Bracket

Note the position of top oven thermal cutout mounting bracket. The TCO should fit firmly to the top of the cavity

ANTENNA MOTOR – REMOVAL Cont’d

ENSURE PROPER ALIGNMENT

“Triangle to Dot to Triangle to Dot”

WHEN REASSEMBLING ANTENNA SYSTEM, THIS ENSURES PROPER ANTENNA POSITIONING INSIDE THE OVEN CAVITY

BLOWER MOTOR – RESISTANCE TESTING

60HZ Dual Voltage Rated Products

Common to

208V = +/- 24Ω

230V = +/- 26Ω

USE CAUTION WHEN REMOVING

WIRING. TERMINALS CAN BE PULLED

OUT OF MOTOR BODY CAUSING DAMAGE

TO MOTOR ASSEMBLY

BLOWER MOTOR – VOLTAGE TESTING

60HZ Dual Voltage Rated Products

COMMON = LINE 1 via Board

LINE 2 (if 208vac) via Board

LINE 2 (if 230vac) via Board

BLOWER MOTOR IS DUAL VOLTAGE RATED.

CONTROL BOARD SENSES INCOMING LINE

VOLTAGE AND SENDS TO MOTOR

USE CAUTION WHEN REMOVING

WIRING. TERMINALS CAN BE PULLED

OUT OF MOTOR BODY CAUSING DAMAGE

TO MOTOR ASSEMBLY

BLOWER MOTOR - REMOVAL

1) Remove wiring (note wire locations)

2) Remove Blower Box Cover

3) Remove Blower Scroll Housing

4) Remove Blower Wheel Securing Screw (Securing Screw)

5) Remove two Blower motor mounting screws located behind blower wheel

BLOWER SCROLL HOUSING

BLOWER SCROLL

HOUSING

SECURING SCREWS

BLOWER WHEEL

ALLEN SCREW

CONTROL BOARD - Removal

Note wiring locations before removing wires.

Control Board mounts via clips.

Four along the top; 3 along the bottom.

CONTROL BOARD – CONNECTOR LOCATIONS

(refer to wiring schematic)

E2 – not used

J1 – LINE

208/230V

E4 E5

J11

E6 E7 J7 J9 J10 J6 J8

CONVECTION FAN – VOLTAGE TESTING

USE CAUTION WHEN REMOVING WIRING. TERMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY

LINE 2 (if 208vac) via Board

LINE 2 (if 230vac) via Board

COMMON = LINE 1 via Triac

CONVECTION FAN MOTOR IS DUAL VOLTAGE RATED. CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS TO MOTOR via TRIAC

CONVECTION FAN – RESISTANCE TESTING

USE CAUTION WHEN REMOVING WIRING. TERMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY

BU = +/- 24Ω

OR = +/- 22Ω

BR = Common

CONVECTION FAN MOTOR IS DUAL VOLTAGE RATED. CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS TO MOTOR via TRIAC

1/2 IN. LEFT HAND THREAD !

CONVECTION FAN – REMOVAL

1) Remove Rear Fan Blade and wiring

2) Remove Heater Box Assembly

3) Remove Convection Fan Blade (1/2 in. Cap Nut) (note order of clip, washers, and blade)

4) Remove three 5/16 in. securing screws

5) Remove Motor from Bracket and Insulation

WHEN REASSEMBLING ENSURE PROPER MOTOR ORIENTATION. WIRE TERMINALS POINT TO THE TOP OF THE OVEN.

CONVECTION FAN

INSULATION

CONVECTION FAN

BRACKET

DISPLAY BOARD – CONNECTOR LOCATIONS

SIDE

TOUCH

PANEL

HV/LV HARNESS

BACK

PROGRAM PORT (Not Used) External Speaker(Not Used)

FRONT

TOP TOUCH PANEL (installed)

SPEAKER

DISPLAY SCREEN

FUSE – ACCESS/REMOVAL

REAR OF UNIT

OVEN THERMAL CUTOUT

FUSE & FUSE BLOCK

An open main fuse caused by high amperage requires the replacement of the Monitor Relay Board since high current will cause the monitor relay board’s contacts to stick. This is a UL requirement.

POWER CORD

TERMINAL BLOCK

Ensure fuse fits firmly in the fuse block.

CATALYST ASSY - ACCESS/REMOVAL

HOUSING

Remove blower and air duct cover

Remove duct top and

blower motor assy.

Fold insulation away from catalyst assy. to access screws

CATALYST ASSY - ACCESS/REMOVAL

Remove screws (10) slide out of housing

Has high temperature gasket part # 59134320

HEATER BOX – ACCESS to Heater & Convection Fan Motor

Remove Blower Motor Housing Assembly

Remove three (3) rear ¼ inch Machine Compartment Bracket screws for the Heater Box

Do Not Tear or Remove the protective High Voltage Polymide Tape part # M0275051

HEATER BOX – ACCESS 2

Remove High Voltage

Transformer

Remove High Voltage Transformer by removing wiring

(noting wire location), sliding out of base and lifting out

HEATER BOX – ACCESS 3

Remove Back, High Voltage Transformer, Blower Assembly Housing, and the three (3) rear board bracket screws

TAPE*

Carefully cut tape and pull the insulation from the perimeter of the heater box

Remove Heater Wiring And Two Convection Motor Mounting Screws

* 15’ Roll of Tape Part Number M0275089

HEATER BOX – REMOVED

EXHAUST

GREASE CHANNEL

SPACERS

HEATER

ALWAYS USE CAUTION WHEN MAKING LIVE VOLTAGE TESTS

Ohm/Resistance Test

Terminal to Terminal with at least one wire Disconnected = +/- 16Ω

Voltage Testing with Component On

Terminal to Terminal with wires securely attached = Line Voltage

INTERLOCK SWITCH ASSEMBLY - Removal

With Door Open,

Remove two (2) screws

Assembly can be lifted up and out

Remove Bracket Screw

INTERLOCK SWITCH ASSEMBLY - Testing

PRIMARY INTERLOCK SWITCH Open-Infinite Ω with Door Open Closed-Continuity 0 Ω with Door Closed

MONITOR INTERLOCK SWITCH Open-Infinite Ω with Door Open Closed-Continuity 0 Ω with Door

NC Terminal

not used

Closed

SECONDARY INTERLOCK SWITCH Open-Infinite Ω with Door Open Closed-Continuity 0 Ω with Door Closed

When replacing door switch assembly move as far forward towards the door as possible before tightening mounting screws. The door should have some play at the latch with the

door closed, it will close tighter when the unit

is up to operating temperature.

MONITOR RELAY BOARD - REMOVAL

Note: An open main fuse caused by high amperage requires the replacement of the Monitor Relay Board since high current will cause the monitor relay board’s contacts to stick.

This is a UL requirement.

Disconnect both wire connectors and remove screw.

Monitor Relay Board and the plastic standoffs come off together.

MONITOR RELAY BOARD - TESTING

1) Unplug Unit

2) Disconnect J2 Connector Test leads at J2-1 to J2-4 and check for Continuity 0 Ω as shown.

3) Plug Unit In

4) J2-1 to J2-4 should now read Open/Infinite Ω

ALWAYS USE CAUTION WHEN

MAKING LIVE VOLTAGE TESTS

POWER RELAY-ACCESS/REMOVAL

Relay is tabbed into mounting bracket

Remove wiring and securing screw at bottom of relay

POWER RELAY- TESTING

PURPOSE of POWER RELAY:

When powered, the Power Relay provides Line 2 through the Triac to the common terminal of the High Voltage Transformer.

OPERATION OF POWER RELAY:

Line voltage is supplied across terminals 0 & 1 via

the Secondary Interlock Switch, Magnetron Thermal

Cutouts, Oven Thermal Cutout, Fuse, & Control Board J1–1 to J2–3.

RESISTANCE TESTING:

0 to 1 = 6M ohms to 7M ohms (diode in circuit) 2 to 4 = Open (not used)

6 to 8 = Open

6M to 7MΩ

OPEN/Infinite Ω

when 0 & 1 are

unpowered

OPEN/Infinite Ω

when 0 & 1 are

unpowered

RTD (TEMPERATURE SENSOR) - TESTING/REMOVAL

THE RTD (resistive thermal device) is the temperature sensor for the unit. Its resistance value increases as temperature increases

Unplug wire connector measure across terminals APPROX. 1100Ω at room temperature APPROX. 1650Ω at 350oF / 177 C

To Remove: Remove securing nut and bolt (inside cavity) and remove the sensor from the cavity top.

THERMAL CUTOUTS (TCO) - TOP

CAVITY THERMAL CUTOUT

Connects in a looping circuit to Control

Board. Failure (open) causes a “HOT”

error code until it resets. Purpose is to protect against high oven temperatures and no food loads.

SPECIFICATIONS for both TCO’s

Open/Infinite Ω at 300° F (149°C) Closed/0 Ω at 257° F (125° C)

Ohm/Resistance Test

Terminal to Terminal with at least one wire disconnected and below 300° F (149° C) = Closed/0Ω

TOP CAVITY THERMAL CUTOUT In series with Oven Thermal Cutout and in circuit that provides line voltage to Control

Board. Failure (open) causes a “dead” unit

symptom. Purpose is to protect against high oven temperatures and no food

loads.

TCO Part #31866P01

THERMAL CUTOUTS (TCO) – RIGHT SIDE

Mag TCO part# B5684130

SPECIFICATIONS

Open-Infinite Ω at 300° F (149° C) Closed-0 Ω at 257° F (125° C)

Terminal to Terminal with at least one wire disconnected and below 300° F (149° C) = Closed-0Ω

Magnetron Thermal Cutouts are in

series and in the circuit that provides line voltage to the Power Relay. Failure (open) creates a no cook symptom. Reasons for failure vary, but are usually due to poor cooling of magnetrons (air flow issue)

or no/light food load conditions.

Ohm/Resistance Test

FRONT

MAGNETRON

THERMAL CUTOUT

REAR

MAGNETRON

THERMAL CUTOUT

THERMAL CUTOUT (TCO) – LEFT SIDE

OVEN THERMAL CUTOUT In series with Top Cavity Thermal Cutout and in circuit that provides line voltage to Control

Board. Failure (open) causes a “dead” unit

symptom. This Thermal Cutout does NOT

reset. Purpose is to protect against extreme oven temperatures and render the oven as non-usable until causes are corrected

SPECIFICATIONS

Open/Infinite Ω at 350° F (177° C)

Terminal to Terminal with at least one wire disconnected and below 350° F (177° C) = Closed/0Ω

Ohm/Resistance Test

OVEN / CAVITY TCO part # B5684123

NOTE: When replacing, ensure insulation is properly in place between the cutout and the oven cavity.

NEW THERMAL CUTOUT (TCO) – BOTTOM LEFT SIDE

OVEN THERMAL CUTOUT In series with Top Cavity Thermal Cutout and in circuit that provides line voltage to Control Board. Failure (open) causes a

“dead” unit symptom. This Thermal Cutout

DOES reset. Purpose is to protect against extreme oven temperatures and render the oven as non-usable until the unit cools down and resets

SPECIFICATIONS

Replace existing 177C TCO with 350C Resettable TCO

OVEN / CAVITY TCO part # 14159097

NOTE: When replacing, ensure insulation is properly in place between the cutout and the oven cavity.

Opens at 662° F (350° C) +/-18⁰

Closes at 482° F (250° C) +/-20⁰

Ohm/Resistance Test

Terminal to Terminal with at least one wire disconnected = Closed/0Ω

TRIACS – RESISTANCE TESTING

CONVECTION MOTOR TRIAC

MAGNETRON TRIAC HEATER TRIAC

Triac = A three electrode semiconductor device that will conduct in either direction when triggered by a positive or negative signal at the gate electrode

MT1

MT2

Ohm/Resistance Test

MT1 to MT2 - Open-Infinite Ω MT1 to Gate - Approximately 60Ω MT2 to Gate - Open-Infinite Ω All to Ground - Open-Infinite Ω

Gate

TRIACS – VOLTAGE TESTING

MT1

MT2

Gate

Voltage Testing with Component On

MT1 to MT2 - 0vac. If line voltage is read, Triac is open so check gate voltage/signal MT1 to Gate - Approx. 0.8vac. No voltage Indicates no signal from control board.

ALWAYS USE CAUTION WHEN MAKING LIVE VOLTAGE TESTS

CAPACITORS & DIODES– ACCESS/REMOVAL

Slide assembly out

REMOVE THREE

BRACKET SCREWS

DIODES – RIGHT TWO BRACKET SCREWS

NEVER TEST HIGH VOLTAGE CARRYING COMPONENTS WITH UNIT POWERED AND ALWAYS DISCHARGE CAPACITORS BEFORE TESTING COMPONENTS.

DIODE TESTING 1

ALWAYS DISCHARGE CAPACITOR BEFORE HANDLING!

MANY VOLT/OHM METERS (DIGITAL OR ANALOG) IN USE TODAY CANNOT READ THE VERY HIGH RESISTANCE ACROSS THE DIODE. METER NEEDS A MINIMUM OF 6 VOLTS OUTPUT ON OHMS SCALE. FOR METERS CAPABLE, RUN THE FOLLOWING TEST.

REMOVE DIODE LEAD FROM CAPACITOR AND CONNECT OHMMETER. DIODE SHOULD READ INFINITE OHMS IN ONE DIRECTION AND GREATER THAN 50,000 OHMS IN THE OPPOSITE DIRECTION (METER LEADS REVERSED)

DIODE COMPLETELY REMOVED FOR ILLUSTRATION PURPOSES

DIODE TESTING 2

ALWAYS DISCHARGE CAPACITOR BEFORE HANDLING!

MANY VOLT/OHM METERS (DIGITAL OR ANALOG) IN USE TODAY CANNOT READ THE VERY HIGH RESISTANCE ACROSS THE DIODE. METER NEEDS A MINIMUM OF 6 VOLTS OUTPUT ON OHMS SCALE. THE RESULT IS MANY DIODES ARE IMPROPERLY DIAGNOSED. IF THE METER BEING USED DOES NOT HAVE THE REQUIRED VOLTAGE, A 9VDC BATTERY CAN BE USED TO ASSIST IN PROPER DIAGNOSIS.

METER SET TO READ DC VOLTS – 9VDC Minimum

CONNECT THE POSITIVE TERMINAL OF THE BATTERY TO THE SPADE TERMINAL OF THE DIODE AND THE NEGATIVE BATTERY TERMINAL TO THE COMMON (BLACK) METER LEAD. CONNECT THE RING TERMINAL OF THE DIODE TO THE RED

METER LEAD.

REVERSE THE DIODE SO THE RING TERMINAL IS NOW ON THE BATTERY AND THE SPADE TERMINAL IS ATTACHED TO THE RED METER LEAD.

RESULT = 0vdc RESULT = Battery Voltage

CAPACITOR TESTING

Capacitance meters are available commercially and are a fast way to help diagnose capacitors. Capacitor values can be obtained by looking at its rating label. Values vary from model to model

0.74

MICROFARAD

2300

VOLTS AC

10M OHM

BLEEDER

RESISTOR

GOOD = .748 OPEN = .000 SHORTED = 1.

HIGH VOLTAGE TRANSFORMER - RESISTANCE TESTING

NEVER TEST HIGH VOLTAGE CARRYING COMPONENTS WITH UNIT POWERED AND ALWAYS DISCHARGE CAPACITORS

BEFORE TESTING COMPONENTS.

208

230

PRIMARY WINDINGS COMMON – 208 = <2Ω COMMON – 230 = <2Ω OPEN TO GROUND

5 6

FILAMENT WINDINGS 5-6 & 7-8 LESS THAN 1Ω OPEN TO GROUND

HIGH VOLTAGE SECONDARY (HV4) APPROX. 28Ω

TO CHASSIS GROUND

HIGH VOLTAGE TRANSFORMER IS DUAL VOLTAGE RATED. CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS LINE 1 TO TRANSFORMER

HIGH VOLTAGE TRANSFORMER LINE VOLTAGE ISOLATION TEST For MW No Heat or Low Heat Condition

IN A COOK CONDITION

208 Line Voltage, test between Com. & 208 results should be 208 Volts 230 Line Voltage, test between Com. &

COM

208

230

230 results should be 230 Volts If not remove wires and test from each wire to chassis ground - should be 115V.

Com. (L2) through Triac-Power Relay and E1 on HV Board. Also check Door Switch Assembly which powers relay

208 or 230 (L1) through relay on HV Board

NEVER TEST HIGH VOLTAGE CARRYING COMPONENTS WITH UNIT POWERED

HIGH VOLTAGE TRANSFORMER IS DUAL VOLTAGE RATED. CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS LINE 1 TO TRANSFORMER

HIGH VOLTAGE TRANSFORMER - REMOVAL

1) Remove Cabinet and Back Panel

2) Remove Transformer wiring (note wire connections)

3) Remove securing screw

4) Slide Transformer to the right approx. one inch.

5) Lift Transformer up and out of securing tab/slot

REMOVE SECURING SCREW

SECURING TAB/SLOT

MAGNETRON - TESTING

Since Magnetron wiring is covered by an air duct, testing can be made at High Voltage Transformer and Capacitor. Note wire locations and disconnect appropriate wires from Capacitor and High Voltage

Transformer

Back Magnetron

WIRE 5 to WIRE 6

LESS THAN 1Ω &

Open to Chassis Ground

Front Magnetron

WIRE 7 to WIRE 8

LESS THAN 1Ω &

Open to Chassis Ground

NEVER TEST HIGH VOLTAGE CARRYING COMPONENTS WITH UNIT POWERED

AND ALWAYS DISCHARGE CAPACITORS

BEFORE TESTING COMPONENTS.

UNCLIP WIRING

(3 LOCATIONS)

MAGNETRON ACCESS (REAR)

REMOVE TCO

REMOVE COVER

(Thermal Cutout ) Wiring

MAGNETRON ACCESS/REMOVAL

DISCHARGE CAPACITORS THEN

REMOVE MAGNETRON WIRING

REMOVE BRACKET

SCREW and SWING

BRACKET DOWN

MAGNETRON WIRING POSITIONED IN CENTER OF AIR DUCT

Upon reassembly always ensure high voltage wiring is firmly secured to magnetron connections

MAGNETRON REMOVAL (REAR) CONT’D

REMOVE 4 - 5/16 NUTS AND DROP

MAGNETRON OUT OF WAVEGUIDE

SERVICE TEST MODE

1) Open and Close the Door

2) In order, press and release the following key pads; Hidden Pad, 1, 3, 5, 7, then 9. (Note: No keypad beep or display change will occur while pressing keypads) Display will show “Service Mode” and reflect Hz and Line Voltage sensed.

Once in Service Mode, pressing another keypad will activate a specific test: