LG MA748W 01 Service Manual - Page 25

program, times, START, touched., CFROUBLEA, Overrseerns, tcri:oevPerationilutrittle,

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• program times are set and START pad is touched. CONDITION S41ting time _does not count down when touching START pad. CHECK RESULT CAUSE er rontinint--v, -p.. No continuity. secondary switch (with door closed). Continuity. -a.- secondary -witch REMEDY ndary -wit -- AI- Check the con -1 .- Continuity nection between CN1 connector and PCB o continuity ii.-. Defectivu PCB assembly. Loose connection. Replace PCB -assembly- Ct. onnection then 2 Fan motor or 710.- Clreck fan motor. oven lamp not turn on. Checkoven lamp. Abnormal Abnormal Normal -0.- Dufective fan motor. - 0.- Replace tan motor e ve oven lamp. Defective oven lamp. - CFROUBLEA-Overrseerns-tcri:oevPerationilutrittle-heatislIroducedinipverrioaci-. CONDITION CHECK RESULT CAUSE REMEDY Output Is low Check th _power source -voltage. -L-ewer-then-99%-ef rating voltage. ► Normal. ecrease in po ► source voltage with loa DisconneL. the wire leads from relay 2 and check on and o ime wi multitester Abnormal. Defective PGB _assembly.. contact local e i•t. power ity co. or alit' e ec mien. Replace PCB assembly. Mna"uro tho output power. NOTE-Simpl Minimum 8.:7C temp Abnormal 5-14 Defective magnetron. Replace magnetron.

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•
program
times
are
set
and
START
pad
is
touched.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
S41ting
time
er
rontini
tv
n
--,
—p..
No
continuity.
—a.-
-witch
ndary
-wit
_does
not
count
secondary
secondary
down
when
switch
(with
touching
START
door
closed).
Continuity.
pad.
--
AI-
Check
the
con
C
ont
i
nu
i
ty
ii.-.
Defectivu
PCB
Replace
PCB
nection
between
-1
.-
assembly.
—assembly-
CN1
connector
and
PCB
then
o
continuity
Loose
connection.
.
t
Connection
2
Fan
motor
or
710.-
Clreck
fan
motor.
Abnormal
—0.-
Dufective
fan
motor.
-
0.-
Replace
tan
motor
oven
lamp
not
turn
on.
Checkoven
lamp.
Abnormal
lamp.
Defective
lamp.
e
ve
oven
oven
Normal
-
CFROUBLEA
-
Overrseerns
-
tcri:oevPerationilutrittle
-
heatislIroducedinipverrioaci
-
.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output
Is
low
Check
th
_power
source
—
voltage.
—L-ewer-then-99%-ef
ecrease
in
po
rating
voltage.
►
source
voltage
with
loa
►
Normal.
contact
local
•
e
it.
power
DisconneL.
the
wire
leads
from
relay
2
and
check
on
and
o
Abnormal.
ity
co.
or
alit'
e
ec
mien.
Defective
PGB
_assembly..
Replace
PCB
assembly.
ime
wi
multitester
Mna"uro
tho
output
power.
Abnormal
Defective
magnetron.
Replace
magnetron.
NOTE
-
Simpl
Minimum
8.:7C
temp
5-14