Invacare HMV Zoom 300 Service Manual page 60

SECTION 8—TILLER
3. Put a block under the frame of the scooter to raise the drive wheels off the ground for
testing purposes.
4. Remove the upper tiller shroud. Refer to Removing/Installing the Upper Tiller Shroud
on page 44.
5. Using a 5/64" allen head tool, loosen the two (2) set screws slightly. Refer to
FIGURE 8.16.
NOTE: DO NOT remove the set screws.
6. Turn the key to the ON position.
7. Locate the RED and WHITE wires from the throttle potentiometer.
8. Using a digital volt meter, take a DC voltage reading from the RED and WHITE wires.
A reading of 2.3 VDC (±0.2) should be displayed. If the reading does not fall within
this range, go to STEP 9.
NOTE: A normal reading is around 2.3 VDC (±0.2), but if the Status LED continues to blink six
(6) times, the throttle pot needs to be re-calibrated.
9. To re-calibrate the throttle pot, perform the following:
A. Leave the digital multimeter hooked up to the red and white wires.
B. Using a small flat screwdriver, adjust the throttle potentiometer by turning the
potentiometer clockwise or counter-clockwise until the multimeter reading is
around 2.3 Volts (±0.2).
10. When the throttle potentiometer is re-calibrated and the reading falls within the
recommended range, tighten the two (2) set screws.
11. Replace the upper tiller shroud. Refer to Removing/Installing the Upper Tiller Shroud
on page 44.
12. Engage the brake release lever. Refer to Disengaging/Engaging the Brake Release
Lever on page 66.
13. Turn the power to the scooter off then on again.
14. Look at the Status LED. A solid GREEN LED should be displayed and the scooter can
be driven.
15. Test drive the scooter.
NOTE: If the scooter does not drive, repeat this procedure. If the scooter still does not drive, call
Invacare at the number listed on the back cover of this manual.
Zoom 300 and Zoom 400
60
Part No 1122167