Component Testing Procedures; Component Specifications - Maytag RFS9B Service

Component Specifications

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor
before servicing, unless testing requires power.
Illustration
Thermal cutout
Diode
Capacitor
Magnetron
Blower motor
RFS12* Transformer
6
4
5
2
1
RFS9B, RCS10*, Transformer
RFS10*
6
4
5
2
1
6 minute timer
©2002 Maytag Appliances Company
!
Component
Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity TCO
Magnetron TCO
Magnetron TCO
Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Discharge Capacitor
Remove wires from capacitor terminals
and connect ohmmeter, set on highest
resistance scale to terminals.
Also check between each terminal and
capacitor case.
Discharge Capacitor
Remove wires from magnetron and
connect ohmmeter to terminals. Also
check between each terminal and
ground.
Remove all wires from motor.
Measure resistance across coil
Discharge Capacitor
Filament
Remove all wires from terminals.
5
6
1
Measure resistance from:
1 to 2
Primary
Terminal 5 to 6
H.V.
Secondary
2
Terminal 4 to Ground screw on
transformer stack
4
Discharge Capacitor
Filament
Remove all wires from terminals.
5
6
1
Measure resistance from:
1 to 2
Primary
Terminal 5 to 6
H.V.
2 Secondary
Terminal 4 to Ground screw on
transformer stack
4
Remove leads from timer contact
terminals.
Measure resistance of following
terminals:
1 to 2
1 to 2
4 to 5
16021520 Rev. 0
WARNING
Testing

Timer in OFF position

Timer in ON position

Timer in OFF or ON position
Results
° °
Opens at 243 F (117 C)
°
Closed at 150 F and open at 250
°
Closed at 180 F and open at 280
Infinite resistance should be
measured in one direction and 50K
or more in the opposite direction.
NOTE: Ohmmeter must contain a
battery of 6 volts minimum.
Between Terminals: Meter should
momentarily deflect towards zero
Ω
then return to over 5 M . If no
deflection occurs, or if continuous
deflection occurs, replace capacitor.
Terminal to Case: Infinite resistance
Between Terminals: Less than 1
Each terminal to ground measures
Infinite resistance.
Note: This test is not conclusive. If
oven does not heat and all other
components test good replace the
magnetron and retest.
Ω
Approximately 14
Ω
Less than <1
Ω
Less than <1
Ω
Approximately 78
Ω
Less than <1
Ω
Less than <1
Ω
Approximately 138
If timer does not indicate readings
below, replace timer.
Ω
Infinite
Ω
Approximately <1
Ω
Approximately 5.8 k (timer motor)
°
F
°
F
Ω
Ω
11