Service manual
3130
Condition
Outlet has
proper voltage.
Fuse does
not blow
No
Continuity
Check continuity
both magnetron and
heater thermostat
check continuity of noise
filter board
Check continuity
of power supply cord
No
Continuity
Normal
Defective touch
control circuit
Replace
Open power
supply cord
Replace
No
Continuity
Defective line
filter board
Replace
Defective
magnetron and
heater thermostat
Replace
Check Result Cause Remedy
Condition
No microwave
oscillation
No
Continuity
Check continuity
of high voltage fuse
Check continuity
of high voltage capacitor
terminals with wires
removed
Check continuity of high
voltage recitifier in
forword and backward
direction with DC megger
Continuity
in backward
direction
Defective high
voltage rectifier
Connect megger
leads to magnetron
terminal and magnetron
body
Continuity
Defective
magnetron
Check resistance of
primary and secondary
coil of high voltage
transformer
0 Ω or ∞
Defective high
voltage
transfromer
Defective high
voltage
transfromer
Defective touch
control circuit
Faulty contacts of
RELAY(RY1) or
open relay coil
Check continuity
of magnetron heater
with wires removed
No
Continuity
No
Continuity
0V
Approx.
-16V DC
Defective
magnetron
Check continuity
of filament terminal
of high voltage
transformer
Check D.C. voltage being
supplied to RELAY(RY1)
coil
Continuity
Defective high
voltage
transformer
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Check Result Cause Remedy
Condition
Grill heater
does not heat
No
Continuity
Check continuity
both primary
interlock switch
Check continuity
of heater
thermostat
Check continuity
of secondary
interlock switch
Check continuity
of heater
No
continuity
Defective heater Replace
Check D.C. voltage
being supplied to
RELAY (RY3) coil
0V
Approx.
-16V DC
Faulty contacts of
RELAY (RY3) or
open relay coil
Defective touch
control circuit
Replace
Replace
No
Continuity
Malfunction of
secondary
interlock switch
Adjust or
replace
No
Continuity
Defective heater
thermostat
Replace the
heater
thermostat
Malfunction of
primary interlock
switch
Adjust or
replace
Check Result Cause Remedy
NOTE 1 : All these switches must be replaced at the same time, please refer to page 18 and 19 for adjustment
instructions.
(TROUBEL 2) Heater does not heat (Food will not become hot).
(TROUBEL 3) No microwave oscillation even though fan motor rotates.