Dsfl" Display Condition - American Dryer Corp. AD-540 Service Procedure

E. "dSFL" DISPLAY CONDITION
When the display reads "dSFL" this condition indicates a fault in the microprocessor controller (computer) heat
circuit. This circuit includes the microprocessor controller (computer), microprocessor temperature sensor
(located in lint compartment) and wires to and from these two (2) points.
1. Check the 1/8-amp fuse on the computer board. If no continuity, replace with ADC PN: 136048. If fuse
repeatedly burns out go to Step #3.
2. Check for loose connection at the microprocessor sensor
bracket harness connector (located in lint compartment),
and the microprocessor 9-position connector at the
microprocessor controller (computer).
3. Discontinue power to dryer.
microprocessor 9-position connector from microprocessor
controller (computer) and locate connector holes 1 and
4. Disconnect sensor harness from sensor bracket
assembly (located in the lint compartment). Check for
continuity across each wire from harness connector in
lint compartment (J11) (pins 1 and 2) to appropriate
microprocessor 9-position connector (1 and 4). If no
continuity, problem is break in wire or bad termination
from that 4-pin (J11) connector through to the computer
9-position connector pins 1 and 4. Also, on the two (2)
wires, check for short to GND.
4. If above procedures check out okay, problem is a defective microprocessor temperature sensor.
Disconnect the
54