MC-767W.pdf

MICROWAVE OVEN

SERVICE MANUAL

MODEL: MC-767W

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

SAFETY PRECAUTIONS

This device is to be serviced only by properly qualified service personnel.

Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be

taken to avoid possible exposure to excessive microwave energy.

PRECAUTIONS TO BE OBSERVED BEFORE AND

DURING SERVICING TO AVOID POSSIBLE

EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

A) Do not operate or allow the oven to be operated with the 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; (1) interlock operation, (2) proper door closing, (3)

seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and

latches, (5) evidence of dropping or abuse.

C) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,

integrity, and connections.

D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual

before the oven is released to the owner.

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.

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR

OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

CONTENTS

(Page)

SAFETY PRECAUTIONS --------------------------------------------------------------------- Inside front cover

SPECIFICATIONS ----------------------------------------------------------------------------------------------------- 1-1

CAUTIONS -------------------------------------------------------------------------------------------------------------- 2-1

INSTALLATIONS ------------------------------------------------------------------------------------------------------ 3-1

OPERATING INSTRUCTIONS ------------------------------------------------------------------------------------ 4-1

FEATURES------------------------------------------------------------------------------------------------------------------------ 4-1

CONTROL PANEL -------------------------------------------------------------------------------------------------------------- 4-1

OPERATING SEQUENCE---------------------------------------------------------------------------------------------------- 4-2

SCHEMATIC DIAGRAM ------------------------------------------------------------------------------------------------------ 4-3

CIRCUIT DESCRIPTION ----------------------------------------------------------------------------------------------------- 4-4

SERVICE INFORMATION ------------------------------------------------------------------------------------------ 5-1

TOOLS AND MEASURING INSTRUMENTS --------------------------------------------------------------------------- 5-1

MICROWAVE LEAKAGE TEST -------------------------------------------------------------------------------------------- 5-1

MEASUREMENT OF MICROWAVE POWER OUTPUT ----------------------------------------------------------- 5-3

DISASSEMBLY AND ADJUSTMENT ------------------------------------------------------------------------------------- 5-3

INTERLOCK CONTINUITY TEST------------------------------------------------------------------------------------------ 5-7

COMPONENT TEST PROCEDURE -------------------------------------------------------------------------------------- 5-8

TROUBLE SHOOTING ------------------------------------------------------------------------------------------------------ 5-13

EXPLODED VIEW ------------------------------------------------------------------------------------------------ 6-1

REPLACEMENT PARTS LIST ------------------------------------------------------------------------------------ 7-1

SCHEMATIC DIAGRAM OF P.C.B. ------------------------------------------------------------------------------ 8-1

PRINTED CIRCUIT BOARD ------------------------------------------------------------------------------------------------- 8-2

P.C.B. PARTS LIST --------------------------------------------------------------------------------------------------- 9-1

SPECIFICATIONS

ITEM

MODEL

Power Requirement

DESCRIPTION

MC-767W

230 Volts AC 50 Hz

Single phase, 3 wire grounded

Microwave 1300W

Grill 1250W

Combination 2650W

Convection 1350W (Max. 2550W)

900 Watts full microwave power (IEC60705)

2450 MHz

2M214 - 39F

0 ~ 99 min.

515 (W) x 303 (H) x 510 (D) mm

342 (W) x 215 (H) x 350 (D) mm

21,0 kg

23,0 kg

Microwave Power for Variable Cooking

Power level

MAX (900W) ...................................... Full power throughout the cooking time

MED.-HIGH (720W) ............................ approx. 80% of Full power

MEDIUM (540W) ................................ approx. 60% of Full power

DEFROST (360W) .............................. approx. 40% of Full power

LOW/WARM (180W)........................... approx. 20% of Full power

• CONVECTION ..................................Max 250°C

• GRILL

• COMBINATION

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Cavity Dimensions

Net Weight

Shipping weight

Control Complement

Nameplate Location

Back side

Accessories

Owner's manual

Glass turntable

Rotating ring

Grill rack, Convection rack

Metal tray

This microwave oven is designed for household use only.

It is not recommended for commercial purposes.

1-1

CAUTIONS

Unlike other appliances, the microwave oven is

high-voltage and high-current equipment.

Though it is free from danger in ordinary use,

extreme care should be taken during repair.

MICROWAVE RADIATION

Personnel should not be exposed to the

microwave energy which may radiate from the

magnetron or other microwave generating

device if it is improperly used or connection.

All input and output microwave connections,

waveguide, flange and gasket must be secure

never operate the device without a microwave

energy absorbing load attached.

Never look into an open waveguide or antenna

while the device is energized.

• DO NOT operate on a 2-wire extension cord during

repair and use.

• NEVER TOUCH any oven components or wiring during

operation.

• BEFORE TOUCHING any parts of the oven, always

remove the power plug from the outlet.

• For about 30 seconds after the oven stops, an electric

charge remains in the high voltage capacitor. When

replacing or checking, you must discharge the high

voltage capacitor by shorting across the two terminals

with an insulated screwdriver.

• Proper operation of the microwave oven requires that

the magnetron be assembled to the waveguide and

cavity. Never operate the magnetron unless it is

properly installed.

• Be sure that the magnetron gasket is properly

installed around the dome of the tube whenever

installing the magnetron.

ANTENNA

Gasket

COOLING FIN

FILAMENT

TERMINALS

MAGNETRON

CHASSIS GROUND

MAGNETRON

• Remove your watches whenever working close to or

replacing the Magnetron.

• NEVER operate the oven with no load.

• NEVER injure the door seal and front plate of the oven

cavity.

• NEVER put iron tools on the magnetron.

• NEVER put anything into the latch hole and the

interlock switches area.

THE OVEN IS TO BE SERVICED ONLY

BY PROPERLY QUALIFIED SERVICE

PERSONNEL.

2-1

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