American Dryer Corp. AD-758 - Manual (Page 45)

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SECTION VII
ELECTRICAL TROUBLESHOOTING
The information provided will help isolate the most probable components associated with the difficulty described.
The experienced technician realizes, however, that a loose connection or broken or shorted wire may be at fault
where electrical components are concerned, not necessarily the suspect component itself.
ELECTRICAL PARTS SHOULD ALWAYS BE CHECKED FOR FAILURE BEFORE BEING
RETURNED TO THE FACTORY.
The information provided should not be misconstrued as a device for use by an untrained person in making
repairs. Only properly licensed technicians should service the equipment.
OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON THE EQUIPMENT OR SPECIFIED
IN THIS MANUAL WHILE MAKING REPAIRS.
A. PHASE 5 OPL SYSTEM DIAGNOSTICS
ALL major circuits, including door, microprocessor temperature sensor, heat and motor circuits are monitored.
The Phase 5 OPL microprocessor controller (computer) will inform the user, via the light emitting diode (L.E.D.)
display, of certain failure codes, along with indicators both in the L.E.D. display and the outputs of each relay,
(and door switch circuit) to easily identify failures.
Diagnostic (L.E.D. Display) Failure Codes
1. “door” - Indicates door switch circuit is open.
a. Keyboard (touch pad) entry was made while main door or lint drawer is open, or
b. There is a fault in the door switch circuit (external of the Phase 5 OPL microprocessor controller
[computer]).
2. “dSFL” - Indicates a fault in the microprocessor temperature circuit.
If fault is detected in the microprocessor heat sensor circuit, the display will read “dSFL,” and the tone
(buzzer) will sound for approximately 5-seconds every 30-seconds until...
a. The problem is corrected, or
b. Power to the dryer is discontinued and the problem is then corrected.
IMPORTANT: The Phase 5 OPL microprocessor controller (computer) has its own internal heat
sensing circuit fuse protection located on the back side of the Phase 5 OPL computer.
If a “dSFL” condition occurs, check to see if this fuse has blown. If it has not, DO
NOT replace the entire Phase 5 OPL microprocessor controller (computer), replace
the fuse and do so with a 1/8-amp (slo blo) fuse ONLY.