Janome Quilt Maker Pro 18 VERSA - Indications of Speed;Needle Position Sensor Failure; Possible Issue: Needle Sense Failure Message; Possible Issue: Motor Attains Full Speed Prematurely

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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 aached, power up the machine and
verify that the green LED D4 “Needle” turns
on and o to indicate Needle Up and Down
posions 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 sha, somemes called the
main sha encoder.
c. If the LED does not turn on/o properly,
determine whether the encoder disk has been
damaged, is dirty, or is loose on the main
sha. Make sure the encoder disk is posioned
properly in the sensor board.
d. If all connecons are good, then it may be
necessary to change the encoder board and
cable.
Indicaons of Speed/Needle
Posion Sensor Failure
2. Possible Issue: Running the machine in manual
mode, the motor aains 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 “Diagnoscs”
menu on either the front or rear handlebar
(refer to the “Diagnoscs Tests” secon in the
user manual). If the displayed value does not
sele on 100 aer pressing the “Start” buon
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 ash on/o 100 mes per
revoluon.
c. With the front cover open verify that the
sensor is in the correct posion and that the
disk is not dirty or damaged.
d. If the disk appears to be in good condion,
slowly rotate the hand wheel with power on
and all cables connected while watching the
“Speed” LED. It should turn on and o with
each of the 100 segments of the outer encoder
disk. If some segments fail to cause the LED
to turn on or o, the sensor board or disk
posion may need to be adjusted or replaced.