| Control transformer | Check for 120VAC supply to the primary of the control |
|
| transformer. If no voltage is present, trace wiring back |
|
| to the oven power switch. If voltage is present, check |
|
| foe 24VAC at the transformer secondary. If there is |
|
| primary voltage, but no secondary voltage, replace |
|
| control transformer. |
| Conveyor motor | Check for 120VAC supply to conveyor motor at wire #6 |
|
| to neutral. If no voltage is present, trace wiring back to |
|
| oven power switch. If voltage is present and motor will |
|
| not run, check the motor windings for opens or shorts. |
|
| WITH POWER OFF: Check the motor windings as |
|
| follows: |
|
| Grey to black - 38Ω approx. |
|
| Grey to blue - 38Ω approx. |
|
| Blue to black - 75Ω approx. |
|
| If any of the above fails, replace conveyor motor. |
| Capacitor, conveyor motor | Check for shorts or grounds. Replace capacitor as |
|
| needed. |
|
| WARNING: Capacitor has a stored charge, discharge |
|
| before testing. |
| Switch, conveyor reversing | Check continuity between switch terminals. Replace as |
|
| needed. |
| Oven control | If there is 120VAC supplied to the motor, and the |
|
| motor, capacitor, and reversing switch check good, |
|
| replace the oven control. |
Conveyor motor runs, | NOTE: Display will indicate |
|
but there is no speed | “BELT JAM” |
|
display |
|
|
| Oven control | Check for output voltage from oven control to hall effect |
|
| sensor (sensor is located in conveyor motor). Measure |
|
| voltage at the motor connector, red wire and yellow |
|
| wire. Voltage should be approx. 10VDC. If no voltage is |
|
| present, trace wiring back to oven control. If there is no |
|
| voltage present at the oven control, replace the oven |
|
| control. |
| Conveyor motor | If there is voltage supplied to the hall effect sensor, |
|
| check for a frequency output from the hall effect |
|
| sensor. Measure frequency across the yellow and white |
|
| wires at the motor connector. Frequency reading |
|
| should be approx. 25 – 100 Hz. If these readings are |
|
| not achieved, replace conveyor motor. If these readings |
|
| are achieved, proceed. |
| Oven control | If the hall effect sensor readings are correct, but there |
|
| is no speed indicated on the display, replace the oven |
|
| control. |
Impinger I – 1450 Series Service Manual - Domestic | 7 |
