Grade Calibration - Quinton Q55 Service Manual

5.4.2 Grade Calibration
A multimeter (Fluke #8022B or equivalent)
and a universal protractor level (Sears
Craftsman #9 3995 or equivalent) are
recommended for grade calibration. Though
the procedure can be performed without using
ei ther instrument, the resulting calibration
will be less accurate. The following procedure
can be performed with the hood and handrail
removed, provided caution is exercised.
1. Take porade to minimum. Use a bubble
level or a protractor to verify that the
treadmill is at zero grade.
NOTE
Grade readings are relative to the floor.
A significantly slanted floor will affect
grade measure mente
2. Use the bubble level or protractor to
verify that the floor is level. Move the
treadmill to a level area if necessary to
calibrate grade.
3. If you are using Quinton's Treadmill
Controller, unplug the treadmill and see if the
grade meter goes to zero. If it does not,
perform the following.
a. Remove the four bolts holding the control
panel in place.
b. Turn the adjustment screw located on the
back of the grade meter until the grade
meter reading is zero.
c. Replace the four bolts to reassemble the
Treadmill Controller.
4. If the bubble level indicates grade is zero
but the grade reading is not zero, perform the
following.
a. If the hood and handrail are still in place,
unplug the treadmill and remove the
handrail and hood.
5·14
I
WARNING
I
clothi ng around
High voltage is
treadmill cable is
Do not wear loose
rotating machinery.
present when the
plugged in.
b. Restore power to the treadmill and turn
the screw at the grade zero
potentiometer 2AIR29 on the PCB until
the grade indication is zero. If you are
using a multi meter, the reading at
2AIR29 should be zero milliamperes.
5. If you are using a protractor to measure
grade, measure grade and proceed to step 8.
6. Mark a spot on the floor exactly 4 feet in
front of the treadmill deck foot.
7. Increase the treadmill grade to 25% (14°)
and, using a carpenter's square, measure the
height from the spot marked on the floor. The
height should be 1 foot.
8. If the height from the floor is not 1 foot
or angle is not 14°, manipulate the grade so
that the height and angle are correct
9. If you are using Quinton's Treadmill
Controller, adjust the grade meter to exactly
25% using the adjustment screw directly to
the right of the ELEV UP pushbutton.
10.
If
the grade indication is not correct on
the Q2000 or 645 PTC, perform the following.
a. If the handrail and hood are still in place,
unplug the treadmill and remove the
handrail and hood.
WARNING
I
Do not wear loose clothing around
rotating machinery. High voltage is
present when the treadmill cable is
plugged in.
b. Restore power to the treadmill and turn
the screw at the grade potentiometer
2AIR30 on the PCB until the grade
readi ng is 25% • If you are using a
multi meter, the reading should be 12.5
milliamperes
(I
millilampere should equal
a 2% increase in grade).
11. Before returning the treadmill to service,
unplug the treadmill and replace the hood and
handrail.
12. Perform the treadmill calibration on the
Q2000 (Steps 1, 2 and 7 of Section 4.4 of the
Q2000 Service Manual) or 645 PTC (Section
6.2 of the 645 PTC Technical ManuaI).