Goldstar MV-1304W User manual

MICROWA E O EN
SERVICE MANUAL
MODEL: MV-1304W/B
CAUTION
BEFORE $SER ICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S1599 May, 2000
Printed in Korea
Website http://biz.lgservice.com

CAUTION
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a. Do not o erate or allow the oven to be o erated with the door o en.
b. Make the following safety checks on all ovens to be serviced before activating the
magnetron or other microwave source, and make re airs as necessary; (1) Interlock
o eration, (2) ro er door closing, (3) seal and sealing surfaces (arcing, wear, and
other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dro ing or abuse.
c. Before turning on microwave ower for any service test or ins ection within the
microwave generating com artments, check the magnetron, wave guide or
transmission line, and cavity for ro er alignment, integrity, and connections.
d. Any defective or misadjusted com onents in the interlock, monitor, door seal, and
microwave generation and transmission systems shall be re aired, re laced, or
adjusted by rocedures described in this manual before the oven is released to the
owner.
e. A Microwave leakage check to verify com liance with the Federal Performance
Standard should be erformed on each oven rior to release to the owner.
•Proper operation of the microwave ovens requires that the magnetron be assembled to the
wave guide 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.
•Routine service safety procedures should be exercised at all times.
•Untrained personnel should not attempt service without a thorough review of the test
procedures and safety information contained in this manual.

FOREWORD
Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing
yourself to the Microwave Energy normally contained within the oven cavity.
TABLE OF CONTENTS (Page)
SAFETY PRECAUTIONS ...................................................................................................... inside front page
SPECIFICATIONS ........................................................................................................................................ 1-1
CAUTIONS ................................................................................................................................................... 2-1
INSTALLATIONS .......................................................................................................................................... 3-1
OPERATING INSTRUCTIONS ..................................................................................................................... 4-1
CONTROL PANEL ............................................................................................................................... 4-1
CONTROL PANEL INSTRUCTIONS ................................................................................................... 4-2
O ERALL CIRCUIT DIAGRAM .................................................................................................................... 5-1
SCHEMATIC DIAGRAM ....................................................................................................................... 5-1
MATRIX CIRCUIT FOR TOUCH KEY BOARD .................................................................................... 5-2
GENERAL INFORMATION FOR SER ICE ................................................................................................. 6-1
GENERAL PRECAUTIONS IN USE ..................................................................................................... 6-1
TRIAL OPERATION .............................................................................................................................6-1
FEATURES AND SPECIFICATIONS FEATURES ............................................................................... 6-1
SER ICE INFORMATION ........................................................................................................................... 7-1
PRECAUTIONS AND REPAIR SER ICE TIPS ................................................................................... 7-1
MICROWA E LEAKAGE TEST ........................................................................................................... 7-2
POWER OUTPUT MEASUREMENT ................................................................................................... 7-3
DISASSEMBLY INSTRUCTIONS ........................................................................................................ 7-4
INTERLOCK SYSTEM ......................................................................................................................... 7-11
INTERLOCK CONTINUITY TEST ........................................................................................................ 7-13
TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING ............................................. 7-14
A. TEST PROCEDURES ..................................................................................................................... 7-14
B. CHECKOUT PROCEDURES .......................................................................................................... 7-17
C. TROUBLE SHOOTING .................................................................................................................... 7-20
EXPLODED IEW ........................................................................................................................................ 8-1
REPLACEMENT PARTS LIST ............................................................................................................. 8-8
SCHEMATIC DIAGRAM OF PCB ........................................................................................................ 8-11
PRINTED CIRCUIT BOARD ................................................................................................................. 8-12
PCB PARTS LIST ................................................................................................................................. 8-13

1-1
Rated Power Consumption .....................................1,350W maximum (Microwave oven+Cook top lamps+ entilation fan)
Microwave Output ...................................................950W (IEC 705 TEST PROCEDURE)
Frequency ...............................................................2,450 MHz ± 50 MHz
Power Supply..........................................................120 AC, 60 Hz
Rated Current..........................................................12.5 Amp. (Microwave oven+Cook top lamps+ entilation fan)
Magnetron Cooling..................................................Forced Air Cooling
Rectification.............................................................Rectification oltage Doubler Half-Wave
Door Sealing............................................................Choke System
Safety Devices ........................................................Magnetron Thermostat:
Open at 150°C ± 4°C
Oven Cavity Thermostat:
Open at 90°C ± 4°C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor
Magnetron...............................................................2M214-5129F
High oltage Capacitor ...........................................Capacitor: 0.95µF, 2.1 K AC
High oltage Diode .................................................Diode; 350mA, 9.0 K
Cook top Lamp........................................................125 , 30 W
Cavity Lamp ............................................................125 , 30 W
Timer.......................................................................Digital, up to 99 mm. 99 sec. (in each cooking stage)
Tray.........................................................................Tempered Safety Glass
Overall Dimensions.................................................217/8”(W)x165/8”(D)x161/8”(H)
Oven Cavity Size.....................................................14”3/4(W)x16”(D)x91/4”(H)
Effective Capacity of Oven Cavity...........................1.3 Cu.ft.
Accessories.............................................................Owner’s Manual & Cooking Guide, Installation Manual,
Exhaust Adapter, Two Filters and Rotating Ring Assembly.
SPECIFICATIONS

2-1
CAUTIONS
• DO NOT operate on a 2-wire extension cord during
repair and use.
• NE ER 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.
• Remove your watches whenever working close to or
replacing the Magnetron.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C.B.
• NE ER operate the oven with no load.
• NE ER injure the door seal and front plate of the oven
cavity.
• NE ER put iron tools on the magnetron.
• NE ER put anything into the latch hole and the interlock
switches area.
• 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 ro erly
installed around the dome of the tube whenever
installing the magnetron.
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.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
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.
Gasket
ANTENNA
COOLING FIN
FILAMENT
TERMINALS
MAGNETRON
MAGNETRON
CHASSIS GROUND

3-1
INSTALLATIONS
PRECAUTIONS ON INSTALLATION
A. Plug the power supply cord into a 120 AC, 60Hz,
single-phase power source with a capacity of 20A.
B. Avoid placing the unit in a location where there is
direct heat or splashing water.
C. Install the unit on the mounting plate firmly.
D. Place the unit as far away as possible from T ,
radio, etc. to prevent interference.
GROUNDING INSTRUCTIONS
For personal safety, this appliance must be fully
grounded at all times.
In the event of an electrical short circuit, grounding
reduces the risk of electrical shock.
The plug must be plugged into an outlet that is
properly installed and grounded.
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
WARNING
Improper use of the grounding plug can result in a
risk of electric shock.
Do not, under any circumstances, cut or remove the
third ground prong from the power cord plug.
CAUTION
This unit is equipped with a 3-prong plug for your
safety. If the wall outlet is a grounded 3-hole type,
the unit will be grounded automatically.
Plug with Ground
Prong
Pro erly Polarized
and Grounded
Outlet

CONTROL PANEL
4-1
OPERATING INSTRUCTIONS
2
3
12
16
7
5
4
8
13 14
15 17
6
10
11
9
19
20
18
ent
On/Off Light On/Off
Custom
Set
One Touch Control
Potato BeveragePopcorn
Frozen
Entree Fresh egetable
Auto
Defrost
Time
0
Power
Stop/
Clear Start
789
456
123
Ez On
Clock Timer
More Less
1

CONTROL PANEL INSTRUCTIONS
4-2
1. DISPLAY: The display includes a clock and
indicators to tell you time of day, cooking time
settings, and cooking functions selected.
2. MORE: Touch this pad to add ten seconds of
cooking time each time you press it.
3. LESS: Touch this pad to subtract ten seconds of
cooking time each time you press it.
4. CLOCK: Touch this pad to enter the time of day.
5. TIMER: Touch this pad to set the kitchen timer.
6. POPCORN: Touch this pad when popping popcorn
in your microwave oven.
7. POTATO: Touch this pad to cook from 1 to 4
potatoes.
8. BEVERAGE: Touch this pad to reheat one or two
cups of a beverage.
9. AUTO DEFROST: Meat, poultry, fish. Touch on pad
to select food type and defrost food by weight.
10. FROZEN ENTREE: Touch this pad to reheat 10
oz.
11. FRESH VEGETABLE: Touch this pad to cook
from 1 to 4 cups.
12. NUMBER: Touch number pads to enter cooking
time, power level, quantities, or weights.
13. POWER: Touch this pad to select a cooking power
level.
14. TIME: Used to set manual time cooking.
15. STOP/CLEAR: Touch this pad to stop the oven or
to clear all entries.
16. START: Touch this pad to start a function. If you
open the door after oven begins to cook, touch
START again.
17. EZ ON: Touch this pad to start microwave oven
without touching START. You can set 30 seconds
up to 3 minutes; after 3 minutes, every touch will
add 1 minute up to 99 min. 59 sec.
18. CUSTOM SET: Touch this pad to change the
oven’s default settings for sound, clock, display
scroll speed, defrost weight.
19. VENT ON/OFF: Touch this pad to turn the fan on
or off.
20. LIGHT ON/OFF: Touch this pad to turn on the
cooktop/countertop light.

5-1
SCHEMATIC DIAGRAM
OVERALL CIRCUIT DIAGRAM

TIMER
Ez On
CUSTOM
SET
FRESH
EGETABLE
5-2
MATRIX CIRCUIT FOR TOUCH KEY BOARD