Goldstar Ma-1303brv Service Manual

MICROW AVE OVEN

SER VICE MANUAL

MODEL: MA-1303BRV

CAUTION

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

http://www.LGEservice.com

e-mail:[e-mail]

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 and CSA should

be performed on each oven prior to release to the owner.

SAFETY PRECAUTIONS

1-1

It is not recommended for commercial purposes.

ITEM

MODEL

Power Requirement

Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement

Accessories

DESCRIPTION

MA-1303BRV

120 Volts AC 60 Hz
1,300 Watts (12.0A)
Single phase, 3 wire grounded
900 Watts full microwave power (IEC705)
2,450 MHz
2M214
0 ~ 99 min. 99 sec.
217/8

˝ (W) x 125/8˝ (H) x 171/4˝ (D)

14

3/4˝ (W) x 91/4˝ (H) x 16˝ (D)

37 lbs (approx.)
40 lbs (approx.)
Touch Control System
Clock : 1:00 - 12:59
Microwave Power for Variable Cooking
Power level

HIGH

-------------------------------

Full power throughout the cooking time

9 (Saute)

------

approx. 90% of Full power, 8 (Reheat)

--------

approx. 80%

7 (Med.-High)

--------------

approx. 70%, 6 (Medium)

--------

approx. 60%

5 (Med.-Low)

---------------

approx. 50%, 4 (Defrost)

---------

approx. 40%

3 (Low)

--------------------

approx. 30%, 2 (Simmer)

---------

approx. 20%

1 (Warm)

------------------

approx. 10%

Owner's manual
Glass turntable
Rotating ring

SPECIFICATIONS

FEATURES

CONTROL PANEL

1. DISPLAY WINDOW

2. ONE TOUCH COOK: This menu has been pre
programmed to cook food automatically by one touch.

3. MORE / LESS: All of the one touch cook and TIMED
COOK can be adjusted to cook food for a longer or shorter
time.

MORE Pressing MORE will add 10 seconds to the

cooking time.

LESS Pressing LESS will subtract 10 seconds of

cooking time.

4. AUTO DEFROST: This feature provides you with the best
defrosting method for frozen foods.

5. NUMBER: These used to set for time of day, cooking time,
power level, or defrost weight.

6. STOP/CLEAR: It used to stop oven and clear all entries
except time of day.

7. CUSTOM COOK: This feature allows you to set and
execute a frequently used single stage program.

8. CLOCK: It is used to set the time of day.

9. Kg/Lbs

10. POWER: You can select the desired power level for
cooking.

11. TIME: You can set the desired cook time.

12. EZ ON: You can extend cooking time in multiples of 30
seconds by repeatedly touching this pad during cooking.

13. START: This feature allows oven to begin functioning.

4-1

OPERATING INSTRUCTIONS

Oven Front Plate

Window Door Screen
Door Seal

Control Panel

Door Open Button
Safety Door Lock System
Turntable

Rotating Ring

Display Window

1

4
7

5

6

83

2

9

11

10

12

13

OPERATING SEQUENCE

The following is a description of component functions
during oven operation.

1. SETTING THE CLOCK

ex.) To set 4:30, touch number key [4],[3], and [0].

NOTE: 1) This is a 12 hour clock.

2) Clock will operate as long as power is
applied to the oven.

2. CANCEL FUNCTION

Touch the pad whenever you need to
cancel an entry or a function currently in use.
The display will either return to the last item entered
or to the clock.

3. EZ ON

4. ONE TOUCH COOKING

NOTE: Heat only 1 package at a time

5. TIME COOKING

6. MULTI-STAGE COOKING

7. AUTO WEIGHT DEFROST COOKING

8. CHILD LOCK

This oven has a CHILD LOCK feature

TO SET CHILD LOCK

• Touch the pad

• Touch and hold STOP/CLEAR pad LOCK

appear on the display.

TO CANCEL CHILD LOCK

• Touch the pad

• Touch and hold STOP/CLEAR pad LOCK

disappears.

9. MORE / LESS

The cook time is adjustable by MORE pad or LESS
pad

10. CUSTOM COOK

You can program the cook time and power level by
using CUSTOM COOK pad.
ex) To set cook time 10 mine 30seconds, touch

number key [1],[0],[3], and [0]

4-2

STOP/CLEAR CLOCK

NUMBER

STOP/CLEAR POPCORN

STOP/CLEAR EZ on

STOP/CLEAR

COOKING

MORE

STOP/CLEAR COOKING

LESS

STOP/CLEAR

1ST STAGE

CLOCK

STOP/CLEAR

AUTO WEIGHT

DEFROST

NUMBER OF

WEIGHT

START

STOP/CLEAR

CUSTOM

COOK

NUMBER POWER

NUMBER

START

STOP/CLEAR

TIME

NUMBER

POWER

NUMBER START

STOP/CLEAR

TIME

NUMBER POWER

NUMBER

2ND STAGE

TIME

NUMBER

POWER

NUMBER

START

STOP/CLEAR

STOP/CLEAR

MEASUREMENT WITH OUTER CASE
REMOVED

• When you replace the magnetron, measure for
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.

Special care should be taken in measuring the

following parts. (Circled area of Fig. below)

- Around the magnetron

- The waveguide

MEASUREMENT WITH A FULLY
ASSEMBLED OVEN

• After all components, including the outer case, are fully
assembled, measure for microwave energy leakage
around the door viewing window, the exhaust opening,
and air inlet openings.

• Microwave energy leakage must not exceed the values
prescribed below.

NOTE: Leakage with the outer case removed less than

5 mW/cm.sq. Leakage for a fully assembled
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm.sq.

NOTES WHEN MEASURING

• Do not exceed meter full scale deflection.

• The test probe must be removed no faster than

1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.

• The test probe must be held with the grip portion of the
handle.
A false reading may result if the operator's hand is
between the handle and the probe.

• When testing near a corner of the door, keep the probe
perpendicular to the surface making sure the probe
horizontally along the oven surface; this may possibly
cause probe damage.

RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT

• After adjustment and repair of any microwave energy
interruption or microwave energy blocking device,
record the measured values for future reference. Also
enter the information on the service invoice.

• The microwave energy leakage should not be more
than 4 mW/cm.sq. after determining that all parts are in
good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.

• At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.

5-2

WARNING : AVOID CONTACTING ANY

HIGH VOLTAGE PARTS

• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000±5) g of potable water.

• The water is contained in a cylindrical borosilicate glass
vessel having a maximum material thickness of 3 mm
and an outside diameter of approximately 190mm.

• The oven and the empty vessel are at ambient
temperature prior to the start of the test.

• The initial temperature (T1) of the water is (10±2)°C It
is measured immediately before the water is added to
the vessel. After addition of the water to the vessel,
the load is immediately placed on the center of the
turntable which is in the lowest position and the
microwave power switched on.

• The time T for the temperature of the water to rise by a
value ∆ T of (10±2)°K is measured, where T is the time
in seconds and ∆T is the temperature rise. The initial
and final water temperatures are selected so that the
maximum difference between the final water
temperature and the ambient temperature is 5°K.

• The microwave power output P in watts is calculated
from the following formula :

4187 x (∆T)

T

is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)

• The water is stirred to equalize temperature throughout
the vessel, prior to measuring the final water
temperature.

• Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.

A. OUTER CASE REMOVAL

1) Disconnect the power supply cord from the outlet.

2) Remove the screws from the rear of the case.
The outer case must be moved backward to be lifted
off.

B. POWER SUPPLY CORD

1) Remove the outer case.

2) Disconnect two terminals, and remove one screw of
the ground terminal.

C. CONTROL PANEL ASSEMBLY

1) Open the door.

2) Disconnect the leadwire from RELAY(RY2) of the

PCB SUB ASS’Y.

3) Lift up and pull out control panel assembly carefully

from the cavity.

4) Disconnect the leadwire from connector(CN1) of the
PCB SUB ASS’Y.

CAUTION: DISCHARGE THE HIGH VOLTAGE

CAPACITOR BEFORE SERVICING

(refer to page 2-1)

5-3

WATER LOAD

TURNTABLE

MEASUREMENT OF MICROWAVE POWER OUTPUT

P =

Remove the screw

Lift up and pull out control panel

DISASSEMBLY AND ADJUSTMENT

ground screw

D. PCB ASSEMBLY REMOVAL

1) Remove the control panel assembly from the
cavity. (Refer to control panel assembly removal
on previous page.)

2) Remove screws which hold the PCB SUB ASS’Y to
the control panel.

3) Disconnect the flat cable from the PCB SUB
ASS’Y and take off the PCB SUB ASS’Y

E. DOOR MAIN ASSEMBLY REMOVAL

1) Open the door.

2) Remove the choke cover cap very carefully with a

flat-blade screwdriver.

CAUTION : Be careful not to damage door seal plate

with the screwdriver.

3) Lift up and push the door.

NOTE:

1. After replacing the door, be sure to check that the

primary switch, monitor switch, and secondary switch
operate normally.

2. After replacing the door, check for microwave energy

leakage with a survey meter. Microwave energy must
be below the limit of 4 mW/cm. (with a 275 ml water
load)

3. When mounting the door assembly to the oven

assembly, be sure to adjust the door assembly parallel
to the chassis. Also adjust so the door has no play
between the inner door surface and oven frame
assembly. If the door assembly is not mounted
properly, microwaves may leak from the clearance
between the door and the oven.

5-4

Remove choke cover cap

Remove door

Spacer

Control Panel

Key Membrane

Button Spring

Door Open Button

PCB Sub Asm

Release
Lever

F. AIR DUCT ASSEMBLY REMOVAL

1) Disconnect the leadwire from the lamp.

2) Remove the mounting screw to the magnetron.

G. MAGNETRON REMOVAL

1) Disconnect the leadwire from the magnetron.

2) Carefully remove the mountinth eg screws holding
the magnetron and the waveguide.

3) Remove the magnetron ASS’Y until the tube is
clear from the waveguide.

NOTE:

1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be
damaged.

2. When replacing the magnetron, be sure to install
the magnetron gasket in the correct position and
be sure that the gasket is in good condition.

3. After replacing the magnetron, check for microwave
leakage with a survey meter around the
magnetron. Microwave energy must be below the

limit of 5 mW/cm2. (With a 275 ml. water load).

Make sure that gasket is rigidly attached to the

magnetron. To prevent microwave leakage,

tighten the mounting screws properly, making sure
there is no gap between the waveguide and the
magnetron.

H. REMOVING THE TURNTABLE MOTOR

1) Remove the turntable.

2) Remove the turntable shaft VERY CAREFULLY.

3) Lay the unit down on its back.

4) Remove the turntable motor cover.
The turntable base cover is easily removed by

pinching the six parts with a wire cutting.

5) Disconnect the leadwire from the turntable motor

terminals.

6) Remove the screw securing the turntable motor to

the oven cavity ASS’Y

7) After repairing the motor, rotate the removed

turntable motor cover.

NOTE:

1. Remove the wire lead from the turntable motor

VERY CAREFULLY.

2. Be sure to grasp the connector, not the wires, when

removing.

5-5

Waveguide
Dome

Waveguide
Bracket

Magnetron
Gasket

Magnetron

Magnetron

Air Duct

Wire Leads

Turntable Motor

5-6

K. HIGH VOLTAGE

TRANSFORMERREMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from magnetron, high
voltage transformer, and capacitor.

3) Remove the screw holding the high voltage
transformer to the baseplate.

J. FAN MOTOR ASSEMBLY REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from magnetron, high
voltage capacitor.

3) Remove the two screws holding the the suction
guide ASS’Y to the oven cavity and remove the
high voltage diode earth screw.

4) Remove the two screws holding the fan motor
ASS’Y to the suction guide ASS’Y.

K. HIGH VOLTAGE CAPACITOR AND

DIODE REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from fan motor and high
voltage capacitor.

3) Remove the screw holding the suction guide ASS’Y
to the oven cavity and remove the high voltage
diode earth screw.

4) Remove the screw holding the high voltage
capacitor bracket.

L. INTERLOCK SYSTEM

1) INTERLOCK MECHANISM
The door lock mechanism is a device which has

been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.

L. INTERLOCK SYSTEM

1) INTERLOCK MECHANISM
The door lock mechanism is a device which has

been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.

2) MOUNTING OF THE PRIMARY/MONITOR/

SECONDARY SWITCHES TO THE LATCH
BOARD

3) INSTALLATION AND ADJUSTMENT OF THE
LATCH BOARD TO THE OVEN ASSEMBLY

• Mount the latch board to the oven assembly.

• Adjust the latch board in the arrow direction so

that oven door will not have any play in it when
the door is closed.

• Tighten the mounting screw.

• Check for play in the door by pushing the door
release button. Door movement should be less
than 0.5 mm. (1/64 inch)

Don't push the door release button while making
adjustment. Make sure that the latch moves
smoothly after adjustment are completed and that
the screws are tight. Make sure the primary,
monitor, and secondary switches operate properly
by following the continuity test procedure.

H.V.
Transformer

Suction
Guide

Noise Filter

H.V.
Diode

H.V.
Capacitor

Fan Motor
ASS’Y

PRIMARY
SWITCH

ADJUSTMENT
DIRECTION

MONITOR
SWITCH

SECONDARY
SWITCH

DOOR PARTS

LATCH BOARD PARTS

CONTROL PANEL PARTS

INTERIOR PARTS

BASE PLATE PARTS

OVEN CAVITY PARTS

6-1

EXPLODED VIEW

INTRODUCTION

6-2

13213A

13552A

13581A

13536A

14026A

14970A

13352A

13720D

DOOR PARTS

6-3

26638A

23572A

268711

WTP

018

24970A

250201

24781M

23550D

24510L

CONTROLLER PARTS

6-4

OVEN CAVITY PARTS

33390G

35889A

WTT021

33112U

340511

WTT010
WTT020

36549S

WTP013

33052M

948501

33461Z

6-5

LATCH BOARD PARTS

43501A

WSZ085

43500A

466001

466001

466003

6-6

INTERIOR PARTS

568771

56930V

56411A

54974S

WSZ196

WTT028

WSZ085

WSZ002

56549F

WTT037

WSZ002

WTT028

WSZ002

55900A

56851D

54810C

55262A

56912C

50CZZH

56324A

WSZ002

WSZ002

56201A

50

FZZA

6-7

BASE PLATE PARTS

63302L

948501

63302R

56170D

WSZ002

WSZ002

WSZ002

647781

647781

P/NO.:3828W5S1550

April, 2000

Printed in Korea