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[TROUBLE 2]
Fuse is blown.
No continuity
Disconnect one side
of lead wire connected
between H.V.T. and
H.V.C, and operate
unit
Fuse blows
Defective H.V.T.
Check continuity of
short switch
Normal
Defective H.V.C.
Replace fuse
Plug power cable into
wall receptacle and
open door.
-
iY
F
lc
ts fuse blown?
Lb
For U.S.A.
models
Check continuity of
Primary latch switch
and power relay B
Continuity
aay
5)
RY 2
Continuity
Shorted contacts of
Primary latch switch
and power relay B
(RY 2)
Shorted contacts of
_ short switch
Replace Primary latch
switch and short switch
(NOTE 3 and. 4)
Replace Primary latch
switch, short switch
and power relay B
(NOTE 3 and 4)
NOTE 3: All these switches must be replaced at same time.
NOTE 4: g
{TROUBLE 3] Other troubles
CONDITIONS
Microwave
output power
is low.
First of all, check if output power is
really low by following "Measure-
ment of microwave; output".
Oven lamp and heater fan motor
turn on when door is open.
Oven larfip and heater fan motor
turn on when power supply cord is
plugged into wall receptacle.
Microwave oven does not operate
normally, when auto sensor cook-
ing is selected.
Heater turns on when
microwave
cooking
In this case, this trouble should be
causing fuse and/or home circuit
breaker to open.
Heater does not turn on.
Refer to adjustment instructions.
heck continuity, of power relay B's contacts (between 1 and 2) and if it has continuity, replace power relay B too.
1. Decrease in power source voltage.
2. Aging change of magnetron,
. Shorted.'contacts of Primary latch switch.
. Open Secondary latch switch.
. Shorted contacts of power relay A. (RY1)
. Defective digital programmer circuit. (See trouble 4)
. Open or loose wiring of sensor terminals from DPC.
. Defective humidity sensor.
. Defective DPC.
(See trouble 4)
. Faulty power relay C(RY4)
. Defective D.P.C.
. Defective heater
. Faulty power relay C(RY4)
. Defective D.P.C. (See trouble 4)
NN-9809,
NN-9859, NN-9509
MQ88s99W, MQ8869W
:
For Canadian
models |
Check continuity of
Primary fatch switch
Continuity
Shorted Primary latch
switch
Replace Primary latch
switch and short switch
(NOTE 3)
535-019
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