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B. TROUBLE
SHOOTING
HINT for repair - Magnetron and high voltage circuit;
Find which is defective magnetron, front or back before following chari below.
(1) Remove the lead wire on the primaty winding of high voltage transformer
for front magnetron.
(2) Put the water load in the cavity and start about one minute.
(3) Check the water temperature.
(4) When water is warm, the circuit of back magnetron is normal.
When water is still cool, the circuit of front magnetron is defective.
CONDITION
TROUBLE
voltage
Timer is set and
Ipowerselect
key ~
is pressed
1
L
Ez!g
EzE5
m
CHECK
RESULT
REMEDEY
Control
circuit
*
boarfJ
Voltage
Replace
(See page
5)
incorrect
L
d
Touch key board
H
Resistance
(See page 6)
incorrect
l+
Replace
I
1
J
1
J
~.
J
,
Interlock
switch
(See page
61
No
continuity
17eplace
p Thermal protector
No continuity
Replace
Door
sensing
switch
No continuity
13cplace
p
(See
page
6)
Safety Relay
*
RL-7
No continuity
Replace
Control circuit
p
hoard
Voltage
Replace
(Seo page 5)
incorrect
r
Safety Relay
p RL-7
No continuity
Replace
Control circuit
p board
Voltage
incorrect
Replace
(See page 5)
P
3
7
H.V Transformer
Resistance
(See page 4)
Replace
incorrect
I
*
H.V Capacitor
Resistance
(See page 4)
incorrect
Replace
,
Magnetron
Resistance
> (See page 4)
Replace
incorrect
–8–
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