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Elevation Motor
** CAUTION **
Do not stand on
the running belt
while performing
these steps.
NOTE: Several of
the following
steps require
dealing with “live”
voltage. Have the
treadmill turned
off and unplugg-
ed when check-
ing wire connec-
tions.
NOTE: The pot-
entiometer values
can be read in
Motor Test Mode,
240 = 0%, 57 =
15% for 110v
units or 80= 15%
for 220v units.
NOTE: The
values in diag-
ram A were taken
from a properly
functioning
elevation system.
You may expect
slight variation
from machine to
machine. If the
values are 0,
check display
cable for possible
short see page
4.17 Display
Cable Symptoms.
If values are err-
aticly different
replace the
Elevation Motor.
The following procedure verifies elevation motor potentiometer response.
Symptoms:
Elevation motor hesitates during operation.
No elevation count reading in Test Mode.
1. The elevation motor potentiometer may have failed or register incorrect values
causing the motor to hesitate while operating. The chart below (see diagram A)
is a guide for the correct elevation readings on the TR 4500.
• Using a Volt Meter verify the following values from the elevation motor at
certain elevation grades (see the chart for elevation grades).
The voltage readings may vary by +/- .05 volts. The ohms may vary by
+/- .01 k ohms. See diagram B for meter reference.
Diagram A.
4.11
% Grade Incline
number in
Motor Test
Mode
DC Voltage across
Blue and Orange
wire on the Elev.
motor connector
Ohm reading between
the Blue and Orange
(elev. motor
unplugged)
DC Voltage on
Pin 4 of the
display
electronics
0 240 4.68 9.76k 4.8
1 228 4.44 9.33 k 4.58
2 216 4.21 8.86 k 4.37
3 204 3.98 8.41 k 4.12
4 192 3.75 7.92 k 3.88
5 180 3.51 7.48 k 3.64
6 168 3.27 6.95 k 3.42
7 156 3.04 6.48 k 3.18
8 144 2.81 6.01 k 2.95
9 132 2.57 5.50 k 2.71
10 120 2.34 4.98 k 2.48
11 108 2.11 4.48 k 2.26
12 96 1.88 3.99 k 2.03
13 84 1.64 3.52 k 1.79
14 72 1.41 2.97 k 1.55
15 60 1.17 2.48 k 1.33