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PROBLEM - C: Display does not start countdown when START key is touched.
PROBLEM - D: Unit operation seems to be normal but little or
no heating is produced in oven load.
Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)
Check: 1. AIR VENTS
1
1
Check continuity of connector
CN2 between Pin 1(PK) and
pin 3(BL) when the door is
closed
Check operation of fan
motor when START key
is touched.
Continuity
OK
Check contact of
connector S1
Contact
OK
Replace
Circuit board
Correct
seating
Normal
circuit board
Normal
contact
Poor
contact
Normal Primary
switch
No
continuity
Adjust or replace door
sensing switch.
Measure resistance
of H.V.capacitor
(see page 7-16)
Resistance
incorrect
Normal
resistance
Measure resistance
of fan motor
Terminal A~C: 140 to 150 ohm
Terminal A~B: 25 to 40 ohm
Resistance
incorrect
Replace
fan motor
Normal
circuit board
Replace
Normal
fan motor
circuit board
Normal
resistance
Replace H.V.C.
Normal H.V.C.
Normal
magnetron
Replace
magnetron
Normal
operation
No
operation
Runs
Runs
Runs
Runs
Runs
Runs
Runs
33