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Service Manual - Page 1
GoldStar
Website http:llus.Igservice.com
MICROWAVE OVEN SERVICE MANUAL
MODEL: MA840B
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO 3828VV5S3748
April, 2004 Printed in Korea
Service Manual - Page 2
tisult the service manual for any-service test o, unsection within the mdmrwave generating
compartments.-check the-magnetron, wave guide or transmission line, and cavityliY proper alignment,
integrity, and orinection
D) Any datective.or=misadjusted components-i-n-the-rntedae rnonitor, deor=seal, and microwave generation
and transmission systems shall be
taken to avoid possible-exposure ...
Service Manual - Page 3
SAFETY PRECAUTIONS SPECIFICATIONS
AUT1 N INSTALLATIONS OPERATING INSTRUCTIONS
URES CONTROL PANEL OPERATING SEQUENCE SCHEMATIC DIAGRAM (I) SCHEMATIC DIAGRAM (II)
IRCUIT DESCRIPTION
Inside front cover 1-1 2-1 3-1 4 1 4-1 4 1 1-2
4-3
4-4 4-5
TOOLS AND MFASURING INSTRUMFNTS
5 1
MICROWAVE LEAKAGE TEST
5-1
MEASUHEMENT OF MICHOWAVE POWEH OUII-1UI
5-3
DISASSEMBLY AND ADJUSTMENT
5-3
INTERLOCK ...
Service Manual - Page 4
It is designed for commercial purposes.
1-1 SPECIFICATIONS
ITEM Model Power Requirement
Power Output Microwave Frequency Magnetron Timer Outside Dimensions Cavity Dimensions Net Weight Shipping weight Control Complement
Rating Label Location
DESCRIPTION
MA840B
120 Volts AC 60 Hz
1200 Watts (10.5A)
Single phase, 3 wire grounded
800 Watts full microwave power (IEC60705)
2450 MHz
2M214-...
Service Manual - Page 5
... is properly installed around the dome of the microwave oven requires that the magnetron gasket is free from the outlet.
• For about 30 seconds after the oven stop, an electric charge remains in ordinary use, extreme care should not be assembled to or replacing the Magnetron.
• DO NOT touch any parts of...
Service Manual - Page 7
... Used to cook the foods
listed by simply touching this pad. 10. Ez On: Allows you to set the time of day. 6. Q DEFROST
4-1 NUMBER: Used to cook for time of day, cooking ...defrost weight. 5. TIME: Used to select power level for a desired time. B. FEATURES
OPERATING INSTRUCTIONS
Oven Front Plate Window Door Screen Door Seal
Display Window Control Panel
CONTROL PANEL
2
%One Touch ...
Service Manual - Page 10
...
BK
OL
F
FAN MOTOR WH
TURN TABLE MOTOR
BK
PRIMA INTERLOCK SWITCH
0)
(O)
(NC)
HN.TRANSFORMER
H.V.CARACITO
H.V.DIODE 6
5N MAGNETRON
4-4 ell:EMIAVT DIAGROtRIM*Check the Rating Model No. (ADD Noise filter)
NOTE* DOOR-IS OPEN
r
. RS.
Service Manual - Page 12
...Devices and Radio ogica
Rockville. MD 20850 • The service personnel should inform the manufacture, importer, or assembler of...• If the oven operates with the pro
shou d instruct the owner not to 600 cc, and place the beaker ....
• Set the energy leakage monitor to 2,450 MHz and
repair any certified oven unit found to have a microwave
MEASURING MICROWAVE ENERGY
•...
Service Manual - Page 13
... 2)
• When you replace the magnetron, measure for a fully assembled oven (Before the latch switch (primary) is installed and after determining that all components, including the outer case, are listed in measuring the following parts. (Circled area of the handle. Also enter the information on the service invoice.
• The microwave energy leakage should be...
Service Manual - Page 14
...placed on the center of the turntable which is in thd lowest position and the microwave power switched on.
• The time T for the ground and securing the ... SERVICING (refer to be lifted off.
MEASUREMENT OF MICROWAVE POWER OUTPUT
• Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting ...
Service Manual - Page 22
...guide. Uneven cooking. Check grounding before h k for tenger-time-per-led
Du not use any static charge built np in a
false realing or_damagP t0-1/017TrietPr
Do not touch artypi
circuit oil the PCB sir
rc electric discharge may not be cooked for bl
2.
THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT...result in your
ody. (Micnm model
CONDITION
Microwave oven
Output power is possible ...
Service Manual - Page 23
... while-counting down. 7.Display_counta.dOwnWtfast 8 Parh indicatarltht does not turrEan after setting cooking_cycle 9.Display time of-day does not reappear when cooking is finished....Rcplacc kcy membrane assembly.
Connect them tugs Illy.
Random programming when-touching oilper pads.
5. Replace key membrane assembly and check operation-
Still have trnuhle
-40.- segniet . • Segment ...
Service Manual - Page 26
(Display operates properly)
CONDITION
o microwave
CHECK
e leads from ruby 2 and...parts,besure to grasp the connector, not the wires. • When removing the magnetron, be sure to install the magnetron gasket in the correct position and in goodcondition. Output is full power -when you set lower
power level
DiSConnect-the-o- Check high vol9
Abnormal norn I
Defective high m_ o, Replace...
Service Manual - Page 32
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Service Manual - Page 33
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INTERIOR PARTS (II)
Model: MA840B / 01
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