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Microwave Oven
Goldstar
MA-2005ST service manual
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Contents
Main
SAFETY PRECAUTIONS
2-1. Function & Type (1/2)
1. How a Microwave Oven Works
2. Type of Microwave Oven
2-1. Function & Type (2/2)
2-2. Installation & Utensils (1/2)
1. Installation
2.COOKING UTENSILS
2-2. Installation & Utensils (2/2)
3-1. Whats the microwave? (1/2)
1. History of dielectric heating
2. The principle of dielectric heating
- 13 -
3. The safety of microwave oven
3-1. Whats the microwave? (2/2)
: Wave Length Where c: The Velocity of Light f: Frequency
c f
300000 Km 245000 KHz 0.122 m 12.2 cm
The division from the sound frequency to the light frequency.
3-2. Conventional heating vs. dielectric heating
It shall be heated by the sources of the electric heater, the gas, and the briquet.!
HEAT!
1. Conventional heating
2. Dielectric heating
4-1. Construction of microwave oven
Magnetron
Cavity
Door
Controller
Page
4-3. WARNING - High voltage circuit ( 4,000 volt )
4-4. Microwave generation system_Magnetron (1/2)
4-4. Microwave generation system_Magnetron (2/2)
TESTING MAGNETRON TUBE
Page
Whats the infrared sensor?
5-2. Infrared sensor
Whats does move automatically?
5-3. Auto moving heater
Conventional Heater LGs Auto Moving Heater
SPECIFICATIONS
1-1
ITEM
MODEL
DESCRIPTION
OPERATING INSTRUCTIONS
4-2
OPERATING SEQUENCE
1ST STAGE
1. SETTING THE CLOCK
2. CANCEL FUNCTION
3. EZ ON 4. ONE TOUCH COOKING
SCHEMATIC DIAGRAM
SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND
IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND
IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES
CIRCUIT DESCRIPTION
GENERAL DETAILS
N
L
N
SERVICE INFORMATION
TOOLS AND MEASURING INSTRUMENTS
MICROWAVE LEAKAGE TEST
NECESSARY TOOLS
NECESSARY MEASURING INSTRUMENTS
SPECIAL TIP
The microwave power output P in watts is calculated from the following formula : 4187 x (T) T
A. OUTER CASE REMOVAL
B. POWER SUPPLY CORD
5-3
MEASUREMENT OF MICROWAVE POWER OUTPUT
P =
DISASSEMBLY AND ADJUSTMENT
D. PCB ASSEMBLY REMOVAL
E. DOOR MAIN ASSEMBLY REMOVAL
5-4
5-5
F. AIR DUCT ASSEMBLY REMOVAL
G. MAGNETRON REMOVAL
H. REMOVING THE TURNTABLE MOTOR
I. HIGH VOLTAGE TRANSFORMER REMOVAL
J. FAN MOTOR ASSEMBLY REMOVAL
K. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL
L. INTERLOCK SYSTEM
5-6
INTERLOCK CONTINUITY TEST
A. PRIMARY INTERLOCK SWITCH TEST
B. SECONDARY INTERLOCK SWITCH TEST
C. MONITOR SWITCH TEST
5-7
COMPONENT TEST PROCEDURE
5-8
5-9
5-10
Relay 2
A
B
TROUBLE SHOOTING
CAUSE REMEDY
5-11
CONDITION
(TROUBLE 1)
5-12
The following visual conditions indicate a probable defective control circuit.
(TROUBLE 2)
5-13
NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8
(TROUBLE 3)
5-14
NOTE :
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
(TROUBLE 5)
5-15
Page
DOOR PARTS
6-2
CONTROLLER PARTS
OVEN CAVITY PARTS
Page
INTERIOR PARTS
6-6
BASE PLATE PARTS
6-7
8-1
SCHEMATIC DIAGRAM OF P.C.B.
7-2
LOC. PART NO. DESCRIPTION SVC NO.
9-1
P.C.B. PARTS LIST
8-2
PRINTED CIRCUIT BOARD
LOC. PART NO. DESCRIPTION SPECIFICATION SVC NO.