Goldstar MV-1715W User manual

ICROWAVE OVEN
SERVICE MANUAL
MODEL: MV-1715W

MV-1715B
MV-1725W
MV-1725B
MV1735W
MV1735B
website: http://us.lgservice.com
P/NO : 3828W5S1467 Jun, 2000
Printed in Korea
BEFORE \SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS ANUAL.

CAUTION

CAUTION
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a. Do not operate or allo the oven to be operated ith the door open.
b. Make the follo ing safety checks on all ovens to be serviced before activating the
magnetron or other micro ave source, and make repairs as necessary; (1) Interlock
operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, ear, and
other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dropping or abuse.
c. Before turning on micro ave po er for any service test or inspection ithin the
micro ave generating compartments, check the magnetron, ave 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
micro ave generation and transmission systems shall be repaired, replaced, or
adjusted by procedures described in this manual before the oven is released to the
o ner.
e. A Micro ave leakage check to verify compliance ith the Federal Performance
Standard should be performed on each oven prior to release to the o ner.
• 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 anual carefully. Failure to adhere to or observe the information in this anual may result in exposing
yourself to the icrowave 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
OVERALL CIRCUIT DIAGRA ...................................................................................................................... 5-1
SCHE ATIC DIAGRA ......................................................................................................................... 5-1
ATRIX CIRCUIT FOR TOUCH KEY BOARD...................................................................................... 5-2
GENERAL INFOR ATION FOR SERVICE................................................................................................... 6-1
GENERAL PRECAUTIONS IN USE ...................................................................................................... 6-1
TRIAL OPERATION ............................................................................................................................... 6-1
FEATURES AND SPECIFICATIONS FEATURES................................................................................. 6-1
SERVICE INFOR ATION ............................................................................................................................. 7-1
PRECAUTIONS AND REPAIR SERVICE TIPS..................................................................................... 7-1
ICROWAVE LEAKAGE TEST............................................................................................................. 7-2
POWER OUTPUT EASURE ENT ..................................................................................................... 7-3
DISASSE BLY INSTRUCTIONS .......................................................................................................... 7-4
INTERLOCK SYSTE .......................................................................................................................... 7-12
INTERLOCK CONTINUITY TEST.......................................................................................................... 7-14
TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING................................................ 7-15
A. TEST PROCEDURES................................................................................................................ 7-15
B. CHECKOUT PROCEDURES..................................................................................................... 7-18
C. TROUBLE SHOOTING.............................................................................................................. 7-21
EXPLODED VIEW.......................................................................................................................................... 8-1
REPLACE ENT PARTS LIST............................................................................................................... 8-8
SCHE ATIC DIAGRA OF PCB .......................................................................................................... 8-10
PRINTED CIRCUIT BOARD .................................................................................................................. 8-11
PCB PARTS LIST................................................................................................................................... 8-12

1-1
Rated Power Consumption 1,500W maximum ( icrowave oven only)
icrowave Output 1000W (IEC 60 705)
Adjustable 100W through 1000W, 10 steps
Frequency 2,450 Hz +50 Hz
Power Supply 120 VAC, 60 Hz
Rated Current 13 Amp. ( icrowave oven+Cook top lamps+Ventilation fan)
agnetron Cooling Forced Air Cooling
Rectification Rectification Voltage Double Half-Wave
Door Sealing Choke System
Safety Devices agnetron Thermal Fuse:
Open at 109 °
C +
_ 4
°
C
Oven Cavity Thermostat:
Open at 110
° C +
_ 5
° C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock onitor
agnetron 2 246-050GF or 2 248J
High Voltage Capacitor Capacitor: 1.0µF, 2.1 KV AC
High Voltage Diode Diode; 350mA, 9.0 KV
Cook top Lamp 125 V, 30 W or 40 W
Cavity Lamp 125 V, 30 W
Timer Digital, up to 99 mim. 99 sec. (in each cooking stage)
Tray Tempered Safety Glass
Overall Dimensions 2915/16”(W)x167/16”(D)x151/2”(H)
Effective Capacity of Oven Cavity 1.7 Cu.ft.
Accessories Owner’s anual & Cooking Guide, Installation anual,
Exhaust Adapter, Exhaust Damper, ounting Kit and Two
Filters, Rotating Ring Assembly, etal Rack.
SPECIFICATIONS

2-1
CAUTIONS
• 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.
• Remove your watches whenever working close to or
replacing the agnetron.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C.B.
• 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.
• 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 henever
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
AGNETRON
CHASSIS GROUND
FILA ENT
TER INALS
AGNETRON

3-1
INSTALLATIONS
PRECAUTIONS ON INSTALLATION
A. Plug the power supply cord into a 120V AC, 60Hz,
single-phase power source with a capacity of 15A
or 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 TV,
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 ith Ground
Prong
Properly Polarized
and Grounded
Outlet

CONTROL PANEL
4-1
OPERATING INSTRUCTIONS
LessMore
Clock
One Touch Control
Popcorn
Pizza Reheat
Potato Beverage
Cook
Power
Level Time Cook
123
456
78
0
9
Start
Stop/
Clear
Custom
Set Hold Warm Auto Defrost
Ez On
Help
Custom
Cook Light Timer Kitchen Timer
Turntable
On/Off
Vent
Hi-Low-Off
Light
Hi-Low-Off
14
4
5
6
7
8
10
11
20
13
16
17
19
2
3
12
9
15
18
21
1
14
4
5
6
7
8
10
11
20
13
16
17
19
2
3
12
9
15
18
21
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: Press this pad to add ten seconds of cooking time
each time you press it.
3. LESS: Press this pad to subtract ten seconds of cooking
time each time you press it.
4. CLOCK(TIME OF DAY): Press this pad to enter the time
of day.
5. HELP: Press this pad to learn how to use each oven
function.
6. ONE TOUCH CONTROL: Press these keys let you cook
foods easily.
7. NUMBER: Press number pads to enter cooking time,
power level, quantities, or weights.
8. POWER LEVEL: Press this pad to select a cooking power
level.
9. TIME COOK: Press this pad followed by Numper Pads to
set a cooking time.
10. STOP/CLEAR: Press this pad to stop the oven or to
clear all entries.
11. START: Press this pad to start a function. If you open
the door after oven begins to cook, START again.
12. EZ ON: Press this pad to cook for 30 seconds at 100%
power level.
13. CUSTOM SET: Press this pad to change the oven’s
default settings for sound, clock, display speed, defrost
weight, and demo mode operations.
14. HOLD WARM: Press this pad to keep hot, cooked foods
safely warm in your microwave oven for up to 99 minutes
99 seconds.
15. AUTO DEFROST: Press this pad to select food type and
defrost food by weight.
16. CUSTOM COOK: Press this pad to recall one cooking
instruction previously programmed into memory.
17. LIGHT TIMER: Press this pad to set the light timer.
18. KITCHEN TIMER: Press this pad to set the kitchen
timer.
19. TURNTABLE ON/OFF: Press this pad to turn off the
turntable. OFF will appear in the display.
20. VENT HI/LOW/OFF: Press this pad to turn the fan on or
off.
21. LIGHT HI/LOW/OFF: Press this pad to turn on the
cooktop/countertop light.

5-1
A
B
C
SCHEMATIC DIAGRAM
OVERALL CIRCUIT DIAGRAM

MATRIX CIRCUIT FOR TOUCH KEY BOARD
78654321
POPCORN
VENT
H/L/OFF
HELP
POTATO
LIGHT
H/L/OFF
CUSTO
SET CUSTO COOK
1
678 90
23
45
BEVERAGE
EZ ON
CLOCK
HOLD
WAR
POWER
LEVEL
KITCHEN
TI ER
LIGHT
TI ER
PIZZA
START
STOP/
CLEAR TI E
COOK
AUTO
COOK AUTO REHEAT AUTO DEFROST
LESS
ORE
N.C N.C N.C
N.CN.C N.C
TURNTABLE
ON/OFF
9
10
11
12
13
5-2