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Indications of Speed/Needle
Position Sensor Failure
1. Possible Issue: A message on the handle display
indicates a "Needle Sense Failure."
a. Make sure the Speed/Needle Sense cable is
properly connected to the control board and to
the sensor inside the machine front cover.
b. With the machine front cover open and all
cables attached, power up the machine and
verify that the green LED D4 "Needle" 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 at the main shaft, sometimes called the
main shaft encoder.
c. If the LED does not turn on/off properly,
determine whether the encoder disk has been
damaged, is dirty, or is loose on the main
shaft. Make sure the encoder disk is positioned
properly in the sensor board .
d. If all connections are good, then it may be
necessary to change the encoder board and
cable .
Janome-America.com
2. Possible Issue: Running the machine in manual
mode, the motor attains 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 machine front cover and double-
check the "Speed" LED (D6) on the control
board. It should flash on/off 100 times per
revolution.
c. With the front cover open 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 or disk
position may need to be adjusted or replaced.
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