Maytag JMV8186AA Series, Руководство по обслуживанию

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Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to microwave and discharge capacitors
before servicing, unless testing requires power.
©2005 Maytag Services
16026440 13
Illustration Component Test Procedure Results
High voltage
transformer
Primary
Secondary
Filament
0 V
120 V
Discharge Capacitor
Disconnect connector and measure
continuity with meter on R x 1 scale:
Secondary ..........................................
Filament ..............................................
Primary (High & Low)..........................
(Measure at room temp., or 68° F/20° C)
Measure continuity, meter on “High” scale:..
Primary winding to ground ..................
Filament winding to ground .................
Approximately 92
Ω
Continuity
Less than 1
Ω
Infinite
Ω
Infinite
Ω
Low voltage
transformer Remove low voltage transformer from
control circuit board and check:
(Measure at room temp., or 68° F/20° C)
Between pins 1 and 2 (Input) ..............
Between pins 4 and 5 (19v output) .....
Between pins 7 and 8 (2.7v output) ....
Approximately 244
Ω
Approximately 11
Ω
Approximately 2
Ω
Magnetron Discharge Capacitor
Remove wires from magnetron and
connect ohmmeter to terminals. Also
check between each terminal and ground.
Between Terminals: Less than 1
Ω
Each terminal to ground : Infinite
resistance.
Note: This test is not conclusive. If
oven does not heat and all other
components test good replace the
magnetron and retest.
High voltage
capacitor Discharge Capacitor
Remove wires from capacitor terminals
and connect ohmmeter to terminals, set
on highest resistance scale.
Also check between each terminal and
capacitor case..............................................
Between Terminals: Meter indicates
continuity for a short time, then 9 m
Ω
.
If meter indicates continuous
continuity, capacitor is shorted. If
meter indicates continuous 9 m
Ω
,
capacitor is open. Replace capacitor.
Terminal to Case: Infinite resistance
High voltage diode Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Infinite resistance measured in one
direction and several hundred k
Ω
measured in the opposite direction.
NOTE: Ohmmeter must contain a
battery of 6 volts (minimum).
Primary interlock
switch test
(Bottom switch)
1
2
Measure resistance between
terminals 1 and 2:
Door Open ...................................................
Door Closed.................................................
Open (Infinite)
Continuity
Secondary interlock
switch test
(Top switch) Measure resistance between
terminals 1 and 2:
Door Open ...................................................
Door Closed.................................................
Open (Infinite)
Continuity
Interlock monitor
switch test
(Middle switch)
1
2
Measure resistance between
terminals 1 and 2:
Door Open ...................................................
Door Closed.................................................
Continuity
Open (Infinite)