DOWNLOAD LG MS-2043AL Service Manual ↓ Size: 2.45 MB | Pages: 41 in PDF or view online for FREE

Model
MS-2043AL
Pages
41
Size
2.45 MB
Type
PDF
Document
Service Manual
Brand
Device
Microwave Oven
File
ms-2043al.zip
Date
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5-15
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1. Setting time
does not count
down when
touching START
pad.
2. Fan motor or
oven lamp do
not turn on.
No continuity.
Continuity.
Continuity
Defective PCB
assembly.
Loose  connection.
Replace PCB
assembly.
Connect them
tightly.
No continuity
Abnormal
Check fan motor.
Defective fan motor.
Replace fan motor.
Abnormal
Normal
Check oven lamp.
Defective oven lamp.
Replace oven lamp.
Defective
secondary switch.
Replace
secondary switch.
Check continuity
of secondary
switch (with
door closed).
Check the con-
nection between
CN1 connector
and PCB
assembly.
(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired         
program times are set and START pad is touched.
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
NOTE : Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low
Lower than 90% of
rating voltage.
Normal
Abnormal
Defective PCB
assembly.
Replace PCB
assembly.
Normal
Abnormal
Measure the
output power.
Defective
magnetron.
Replace
magnetron.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
Disconnect the
wire leads from
relay 2 and
check on and off
time with
multitester.
5-16
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No microwave
oscillation.
No continuity.
Continuity.
Abnormal
Defective high
voltage
transformer.
Replace high
voltage
transformer.
Normal
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and
check continuity
of relay 2.
(Operate the unit)
Check high vol-
tage transformer.
Abnormal
Defective circuit
protector.
Replace circuit
protector.
Normal
Check circuit
protector.
Abnormal
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Normal
Check high vol-
tage capacitor.
Abnormal
Defective high
voltage diode.
Replace high
voltage diode.
Normal
Check high vol-
tage diode.
Abnormal
Defective
magnetron.
Replace
magnetron.
Check
magnetron.
(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.         
(Display operates properly)
5-17
Output is full power
when you set lower
power level.
Abnormal.
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and check
continuity relay 2. 
(Operate the unit)
NOTE : • Make sure the wire leads correct position.
• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position     
and in good condition.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.         
(Display operates properly)
LATCH BOARD PARTS
INTERIOR PARTS
BASE PLATE PARTS
OVEN CAVITY PARTS
DOOR PARTS
CONTROL PANEL PARTS
6-1
EXPLODED VIEW
INTRODUCTION
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