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Service Manual - Page 1
GoldStar
Website: http://us.lgservice.com
MICROWAVE OVEN SERVICE MANUAL
MODEL: MA8000ST
CAUTION
BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P!NO : 3828W5S3961
August, 2004 Printed in Korea
Service Manual - Page 2
...,-replaced-er-adiusted-bterocedures-desefibee in this manual
before activeting:the
microwa
repairs as necessary; (1) interloek--eperation, (2)-proper-deer-elosing, (3)
seal and sealing-sufflitees-@rcing, wear, and other damage), (4) damage to or looseninglyftinges and
latches, evidence of dropping or abuse. Any defectivemmisadjuste
aye generation
and transmission systems shatl-be serviced...
Service Manual - Page 3
CONTENTS
SAFETY PRECAUTIONS
CAUTIONS INSTALLATIONS
CONTROL PANEL OPERATING SEQUENCE SCHEMATIC DIAGRAM (I) SCHEMATIC DIAGRAM (II) CIRCUIT DESCRIPTION SERVICE INFORMATION TOOLS AND MEACI1RINC INSTRUMENTS MICROWAVE LEAKAGE TEST MEASUREMENT OF MICROWAVE POWER OUTPUT
TROUBLE SHOOTING EXPLODED VIEW REPLACEMENT PARTS LIST
Pane Inside front cover
2-1 3-1
4-1 4 2 4 3 4-4 4-5 5-1 5-1 5-1 5-3
5-11 6-1 7-1
Service Manual - Page 4
.... 40% approx. 20%
I=
Back Side
Accessories
Owner's manual Glass turntable Roller Rest
This microwave oven is not recommended for household use only. SPECIFICATIONS
ITEM MODEL Power Requiremen
Power Output Microwave Frequency Magnetron Timer Outside Dimensions Cavity Dimensions Net Weight Shipping weight Control Complement
Nameplate Location
DESCRIPTION
MA8000ST 120 Volts AC 60 Hz (10.5A...
Service Manual - Page 8
... • Touch and hold 0 pad
L disappear.
4-2 AUTO DEFROST COOKING
STOPICLEAR
AUTO DEFROST
NUMBER OF WEIGHT
START
8. CHILD LOCK
This oven has a CHILD LOCK feature
TO SET CHILD LOCK
• Touch the I 0 I '/ LEAH pad whenever you need to eancel-an entry-era-funefron-currently in use The display will oporato as long...
Service Manual - Page 10
... FILTER ASSY
BK PRIMARY INTERLOCK
O SWITCH (NO)
YL
(CI
0---05-NCM) ONITOR
SWITCH BN
H.V.TRANSFORMER WI-I
H.V CARACIT9R
RD MAGNETRON
4-4 SCHEMATIC DIAGRAM (II) *Check the Rating Model No. (ADD Noise filter)
NOTE: 1. DOOR IS OPEN. 2.
Service Manual - Page 11
... opening and ciosing-of the magnetron. FUSE
AO_
MONITOR SWITCH
0
1
HV TRANSFORMER
0
PRIMARY SWITCH
RELAY 2
0--15
SECONDARY SWITCH
0ro-zn0
MICOM CONTROLLER
-5 WHEN THE OVENIS SET AT ANY LEVEL EXCEPT MAXIMUM.
• The micom controller controls the ON-OFF time of relay 2 by the applied signal to the filament of -
the...
Service Manual - Page 12
...check microwave leakage prior to
LEAKAGE
sentlaing-
-
. -The-service-personnel-shoutd4nforrn-the
which-ls-graduated-to use the 2- The service personnel should instruct the owner not to -600-ecTand-place-the-beaker on...Radiological Health) immediately
NOTE: Address on the center of 5 mW/cm' anc 10U repair any unit found to have excessive emission levels at no cost
use-it-fol-lowing...
Service Manual - Page 13
.... The waveg •
WARNING • AVOID CONTACTING ANY HIGH VOLTAGE PARTS
• Danotsxceed mettle
deflection
• Thtildbtprote:must -notracco.d the voillog
tamper-resistant Torx driver have the electromagnetic energy eakage monitor checked for future reference Also enter the information on the service invoice. • The microwave-energy leakage should -ha-taken in measuring...
Service Manual - Page 14
... rated voltage and
ooeldtea dt its maximum microwave ower se in seconds and AT is the temperature rise.
C.
CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (refer to page 2-1)
5-3
Lift up time is not includec. (about 3 sec)
p is measured immediately before the water is added to
• The water is stirred...
Service Manual - Page 22
... the oven- wall. Ceramic ware trimmed in your
body. (Micom model only)
Microwave oven does not work. Do not use metallic ware ... any part of-the circuit on the PCB since static electric a sc arge may result in the cooking guide. Do...INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVF OVFN THIS CAN FLIMINATF AN UNNFCESSARY SFRVICF CAI L
1 Check grounding-laefore-checking_for trouble...
Service Manual - Page 23
... when touching other pads.
assembly.
Display shows number or figure different from one touched. Defective PCB -► ass
Replace PCB -11 0.
Connect them tiglitly. Fverything works
Defective key
as specified. -111P membrane
-assambly.
=`•.- Defective...when cooking is normal.)
of tarn-on after setting cooking cycle.
9. Still have trouble.
No continuity.
Service Manual - Page 25
...set and START pad is normal condition.
5-14
assembly
Defecti e magnetron. of rating voltage. Continui o con inui
Defective PCB assembi
2.F oven lamp do
Check fan motor. REMEDY
p ace
PCB mbl . Replace.... REMEDY
Suggest customer_ contact local electric pow( qualified
assembly
Replace magnetron.
ep ace oven amp.
(TROUBLE 4) Oven seems tQbe opera
CONDITION
Output is low. Disconnect...
Service Manual - Page 32
Rating Model No.
0D8R
568771
* Check the Rating Model No.
56411
56930
.0%
0
rvATLI-4
e
56549
EBOO
55900
g
r
037
* Check the Rating Model No. 549745
50CZZH 56324
56851D
11O *BOG)
4-1AQDTT028 54810C
6-6 #EV#
INTERIOR PARTS (I)
Model: MA8000ST
Check the rating label of Model and order SVC parts according to the Model No.
* Check the
* Check the
Rating Model No.
Service Manual - Page 33
#EV#
INTERIOR PARTS (II)
Model: MA8000ST / 01
* Check the Rating Model No. 568771
Check the rating label of Model and order SVC parts according to the Model No.
* Check the Rating Model No.
5200 56411
*9301) ALP' I
G
dis-@0* Y.
*B0()
*ZZy) *Check the
Rating Model No. 56201
56549F
I9 Ij
43
55900
037
* Check the Rating Model No.
54974S
50CZZH 56324
54810C...
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