Panasonic NE-7920 Service Manual page 27

output" on page 20.
CHECK
Check the power
source voltage
CONDITION
Output power
is low
with magnetron
oscillating.
Check the timing
periods of the 24 V
D.C. being applied to
the variable power
switch coil
NOTE 3
RESULT CAUSE
Lower than Decrease in
105 volts power source
voltage
Normal
Defective digital
programmer
circuit
Aging change of
magnetron
| POWER 24 V ON TIME 24 V OFF TIME
22 (seconds) 0 (seconds)
2 20
7 15
REMEDY
Customer education
Replace
Replace depending
on the result of
output test
CONDITION
CHECK
Check wiring connected
to sensor element
Auto cooking
circuit
Check sensor element
and digital programmer
circuit
Refer to component
test procedure on
page 29.
RESULT
Defective sensor
element
Defective digital
programmer
circuit
B13
CAUSE
REMEDY
Repair
Replace
Replace