Star Trac TREADMILL Service Manual page 22

Display Code Troubleshooting Chart
Display Code Description of code
No Rail Stop # of times the Stop Switch/
Stop key was down or
disconnected on power-up
KEY DN
# of times, one of the keys
was down or depressed on
power-up since last reset.
SPEED CHG
# of times a sudden change
in speed was detected.
since last reset.
Possible Cause
1. Disconnected Stop
Switch on the
handrail or in the
upper display
board.
2. Stop Key on the
Display Board
faulty.
1. One or more
key(s) on the
display panel are
faulty or stuck.
1. Sudden speed
change was
detected from the
RPM Sensor.
Solution
A. Carefully pop-
out the handrail
stop switch from
the handrail and
check connec-
Tion.
B. Verify that the
Stop Switch is
not damaged or
that it is sticking.
C. Remove left
handrail and
check Stop
Switch within the
handrail.
D. Carefully remove
the display
board and check
connection. See
page 28.
E. Replace Stop
Switch Assembly
A. Engage Display
Test and check
STOP KEY. See
page 18.
A. Engage Display
Test and check
key pad re-
response. See
page 18.
A. Engage Motor
Test Mode, see
page 17 and
verify speed
response. No
response would
indicate RPM
Sensor re-
placement.
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