American Dryer Corp. AD-540, Service Procedure

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C. NO START CONDITION
Follow this test procedure, providing that the microprocessor
controller (computer) is functioning where the display is in
the normal operating mode and the motor indicator dot is
on, and the light emitting diode (L.E.D.) motor output light
is on. The voltage you
should be reading is 24 VAC unless
otherwise specified.
1. Check to see if “ dOOr ” L.E.D. input light is on.
(Located on component side of the computer board.)
If it’s off, refer to “
dOOr ” in the Troubleshooting
Section .
2. Check for voltage at the microprocessor pin #7. If no
voltage check for a loose connection or the
microprocessor itself is faulty. If no voltage is present,
proceed to the next step.
3. Check for voltage across the coil connections of the
motor relay. If no voltage is evident, check for a loose
connection going back to (J5) 6-pin connector #3. If
voltage is evident proceed to the next step.
4. Take a voltage reading on the motor contactor between L1 and N (neutral). If no voltage (120 VAC)
replace the motor contactor. If voltage is present, check for loose connection going to the drive motor or
the drive motor itself maybe faulty.