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113242-3
Procedure for Functional Check
of Replacement Components _______
Microprocessor Controller (Computer) Board
Phase 7 Coin Models
Upon completing installation of the replacement
microprocessor controller (computer) board, reestablish
power to the dryer.
Start the drying cycle by pressing any temperature selection
keys (HI, MED, or LO).
Verify that the applicable indicator lights on the
microprocessor controller (computer) board are lit. (Refer to
the illustration below.)
Phase 7 Non-Coin Models
Upon completing installation of the replacement
microprocessor controller (computer) board, reestablish
power to the dryer.
Start the drying cycle by pressing any of the preset cycles in
letters A-F.
Verify that the applicable indicator lights on the
microprocessor controller (computer) board are lit. (Refer to
the illustration below.)
For Models with Johnson Direct Spark Ignition
(DSI) Controller (G760)
Theory of Operation:
Start the drying cycle. When the gas burner ignites within the
chosen trial for ignition time (6-seconds), the flame sensor
detects gas burner flame and signals the DSI module to
keep the gas valve open as long as there is a call for heat.
The DSI module will “LOCK OUT” if the gas burner flame is
not sensed at the end of the trial for ignition period. The trial
for ignition period will be repeated for a total of three (3)
retries/trials (the initial try and two [2] more retries/trials). If
the flame is not sensed at the end of the third retry/trial (inter-
purge period of 30-seconds) the DSI module will “LOCK OUT”
