Indications Of Speed/Needle Position Sensor Failure - Handiquilter HQ Sweet Sixteen Service Manual

Indications of Speed/Needle Position
Sensor Failure
Figure 13.2
1. A message on the handle display indicates a "Needle
Sense Failure."
a. Make sure the Speed/Needle Sense cable is properly
connected in the C-Pod.
b. With the C-Pod open and all cables attached, power up
the machine and verify that the green LED D4 "Needle"
(Figure 13.2) turns on and off to indicate Needle Up and
Down positions as you rotate the hand wheel (D4 works
the same way as the "Needle" LED that is mounted to the
internal Needle/Speed Sensor board) .
c. If the LED does not turn on/off properly, open the front
cover and determine whether the encoder disk has been
damaged or is dirty and make sure the sensor board is
positioned properly as shown in Figure 13.1 on
previous page.
Page 38
2. Running the machine in manual mode, the motor at-
tains full speed prior to reaching 100% on the display.
a. This can be caused by the Speed/Needle sensor
missing some of the speed pulses. First run the "Speed"
test within the "Diagnostics" menu on either the front or
rear handlebar (refer to the "Diagnostics Tests" section in
the user manual). If the displayed value does not settle on
100 after pressing the "Start" button on the handles, there
may be an issue with the motor-speed encoder.
b. Remove the C-Pod and double-check the "Speed" LED
(D6) on the circuit board. It should fl ash on/off 100 times
per revolution.
c. Open the front cover and verify that the sensor is in the
correct position and that the disk is not dirty or damaged.
d. If the disk appears to be in good condition, slowly rotate
the hand wheel with power on and all cables connected
while watching the "Speed" LED. It should turn on and
off with each of the 100 segments of the outer encoder
disk. If some segments fail to cause the LED to turn on or
off, the sensor board may need to be adjusted or replaced.
HQ Sweet Sixteen Service Manual