ACP DEC18M - Page 21

Illustration
Component
Testing
Results
Thermal Cutout
Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity Thermal Fuse .......................................
Magnetron TCO ..............................................
Open at 104° C (219° F).
Open at 138° C (280° F) and
closed at 82° C (180° F).
Diodes
Discharge Capacitors
Remove diode lead from capacitor
and connect ohmmeter.
Reverse leads for second test.
Infinite resistance should be
measured in one direction and
50KΩ or more in the opposite
direction.
NOTE: Analog meter must
contain a battery of 6 volts
minimum.
MT2
MT1 GATE
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 60 Ω or more.
Infinite.
Infinite.
Capacitor
Discharge Capacitors
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 MΩ. If no deflection occurs, or
if continuous deflection occurs,
replace capacitor.
Terminal to Case: Infinite
resistance.
ALWAYS USE CORRECT
SIZE