19
RE220002 Rev. 6
High voltages are present during the cook cycle.
Extreme caution should be observed at all times.
Before touching any oven components or wiring,
always unplug the oven from its power source and discharge the
capacitor by shorting across the capacitor terminals with an insulated handle screwdriver.
DANGER
!
Test Procedures
Controller Triac Drive Test
NOTE: This test is provided for reference only. The
controller self diagnosis test is normally all that
is required to verify normal controller operation.
1. Unplug the oven power cord, lower the back panel
and
discharge the capacitor(s). On some models,
remove the left magnetron inlet duct.
2. Connect voltmeter to triac module terminals marked
GRN and BLU.
3. Apply power to the oven and put the oven into a
cook cycle on full (100%) power setting. The meter
should indicate 1 to 6 volts AC during the cook cycle
and zero volts after completion of the cook cycle.
If abnormal readings were measured, replace the control-
ler and retest.
Cook Relay Test
Models VEND -10.000, .A, .B, .C
1. Unplug the oven power cord and remove the control
panel assembly.
2. Disconnect wiring from cook relay terminals.
3. Connect ohmmeter across cook relay terminals A
and B.
4. Meter should indicate approximately 900 ohms.
Procedure A: If meter indicates approximately 900
ohms, go on to Step 5.
Procedure B: If improper indications are given,
replace the cook relay and retest.
5. Connect ohmmeter across relay terminals 11 and
12 as shown below.
6. Press and hold test button on cook relay.
Meter should indicate continuity, (0 ohms). If not,
the cook relay is defective.
7. Release test button.
Meter should indicate infinity. If not, the cook relay is
defective.
8. Connect ohmmeter across relay terminals 13 and 14.
9. Repeat steps 6 and 7.
Cook Relay
Stirrer Motor Test
1. Unplug the oven power cord, lower the back panel,
and
discharge the capacitor(s). On some models,
remove the left magnetron inlet duct.
2. Connect a meter capable of measuring 120 volts AC
across the input leads to the stirrer motor.
3. Apply power to oven and open oven door.
Meter should indicate approximately 120 volts AC.
Procedure A: If meter indicates 120 volts AC but motor
does not operate, replace the motor. (Check the stirrer
blade to be sure it is not binding on stirrer cover.)
Procedure B: If meter indicates zero volts, check oven
wiring continuity and system diagnosis.
Blower Motor Test
1.
Unplug the oven power cord, lower the back panel,
discharge the capacitor(s).
2.
Check the blower wheel to be sure it is not binding or
frozen.
3.
Connect a ohmmeter capable of measuring 120 volts
AC across the input leads to the blower motor.
4.
Apply power to oven and open oven door.
Meter should indicate approximately 120 volts AC.
Procedure A: If meter indicates 120 volts AC but motor
does not operate, replace the motor.
Procedure B: If meter indicates zero volts, check oven
wiring continuity and system diagnosis.
