Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor
before servicing, unless testing requires power.
16
16023463
©2006 Maytag Services
Illustration
Component
Test
Results
Thermal cutout
Disconnect all wires from TCO.
Measure resistance across terminals.
Control TCO ...............................................
Magnetron TCO..........................................
Closed at 113° C (235° F) and open
at 66° C (150° F).
Open at 149° C (300° F) and closed
at 125° C (257° F).
Diode
Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
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.
MT2
MT1
GA TE
Triac
Disconnect wires to triac.
Measure resistance from:
MT1 to MT2 ................................................
MT1 to Gate ...............................................
MT2 to Gate ...............................................
All terminals to ground................................
Caution - Do not operate oven with
wire to terminal MT2 removed.
Infinite.
Approximately 15
, then reverse
meter leads 30
.
Infinite.
Infinite.
Triac 1 (top) is for front element.
Triac 2 (middle) is for rear element.
Measure voltage from MT1 to Gate ............... 0.8 VAC when energized. If no
voltage, check H.V. board and wiring.
Capacitor
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................................................
Between Terminals:
Meter should
momentarily deflect towards zero
then return to over 5 M
. If no
deflection occurs, or if continuous
deflection occurs, replace capacitor.
Terminal to Case:
Infinite resistance.
Snubber assembly
Disconnect wires to snubber.
Measure resistance across terminals.............
Infinite.
Magnetron
Discharge Capacitor
Remove wires from magnetron and
connect ohmmeter to terminals. Also check
between each terminal and ground.
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.
60 HZ Models only
Microwave blower
motor
Remove all wires from motor.
Measure resistance across coil......................
Approximately 26
.
50 HZ Models only
Microwave blower
motor
Remove all wires from motor.
Measure resistance across coil......................
Approximately 33.5
.
Stirrer motor
Remove all wires from terminals.
Measure resistance from terminal to
terminal..........................................................
Approximately 29K
.
EZCard Harness
Test continuity of wires .................................. Continuity.
EZCard Board
Insert EZCard to determine if unit can be
programmed ..................................................
If unit can not be programmed, verify
EZCard harness is good. If harness
is good, replace EZCard Board.
HV board to display
module wiring harness
Test resistance of wires ................................. Continuity.
