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:?-9970, NE-9970C
?-9870, NE-9870C
{TROUBLE 4] No microwave oscillation even though fan motor and turntable rotate.
'CHECK
RESULT
0
REMEDY
Defective digital programmer
circuit
Replace
Check DC voltage being sup-
plied to power relay C coil
C or open relay coil
Replace
NOTE 1: Disconnect two lead wires connected to the power relay C
coll.
;
.
:
Open lead wire (Ref. No. W3)
Set power at High and set any time.
(Refer to fi
;
ircuit
\
:
igure WIRING
Replace lead wire (Ref No.
Normal digital programmer circuit should read approx. 18V
MATERIAL on page 44)
W3) and also magnetron
DC continuously.
NOTE 2: Unlike previous models, no protector is provided on lead
wire W3.
When magnetron filament is short-circuited, this W3 lead wire
will be burnt and act as a protector.
When this lead wire is open, replace together with mag-
Open winding of high voltage
netron.
transformer or faulty insulation
NOTE3:
Refer to component test procedure on page 27.
of filament winding
i
:
(NOTE 3)
;
(NOTE 2)
Replace
Shorted diode
(NOTE 3)
Replace
Faulty magnetron
(NOTE 3)
Replace
(TROUBLE 5] Microwave output power is low. First of all, check if output is really low by following "Measurement of
microwave output" on page 29.
Lower than 105 volts
REMEDY
Decrease in power source
voltage
Customer education
Check the power source vol-
tage with magnetron oscil-
lating.
Defective digital programmer
circuit
Check the timing periods of
the 18V DC being applied to
the power relay C coil (refer to
page 18 for the timing periods
of the power relay C)
Replace depending on the re-
Agin
Sing nenee: OF Magneren
sult of output test
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