Panasonic NE-7910 Service Manual page 31

[TROUBLE 5] — Output power is low _
First of all, check if output power is realy low following "measurement of magnetron's
output on page 23.
CONDITION CHECK RESULT CAUSE REMEDY
Output power Check the power Lower than | Decrease in iA Customer education
is low source voltage 105 volts power source }
with magnetron voltage
| Normal |
oscillating.
e
Check the timing —»| Abnormal +——»}| Defective digital |» Replace |
periods of the 24 V programmer
D.C, being applied to circuit
the variable power ee
switch coil Normal Fy]
NOTE 3
a
Measure the diode Below Replace
current at High
200 mA
t——>|
Faulty magnetron -—>|
|
power
Aging change of Replace depending
magnetron t—>| on the result of
output test
Slightly
below
280 mA
NOTE 3: The following chart shows the timing periods of the variable power switch.
22 (seconds) O (seconds)
Warm
Defrost
[TROUBLE 6]
CONDITION CHECK RESULT CAUSE REMEDY
. Repair | Check wiring connected
to sensor element
Auto cooking /-—>»
circuit
Normal 7
R Check sensor element Defective sensor [—> Replace
| in digital program- element
¥
mer circuit
v Defective digital [> Replace
programmer
circuit
Refer to component
test procedure on
page 34.
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