Center Needle Position Adjustment - Janome MC7700 QCP Service Manual

CENTER NEEDLE POSITION SENSOR ADJUSTMENT
THE CENTER NEEDLE POSITION SENSOR WILL BE "ON" WHEN THE NEEDLE BAR IS AT CENTERED POSITION
(INITIALIZED).
SENSOR
BOARD
MECHANICAL ADJUSTMENT
FIG.1
SETSCREW
[TO CHECK]
1. WHILE PRESSING THE NEEDLE UP/DOWN AND
LOCK STITCH BUTTONS, TURN THE POWER
SWITCH ON. THE LCD SCREEN WILL DISPLAY
"FACTORY ADJUST".
2. TURN THE JOG DIAL TO SELECT "06. Sensor".
PRESS THE CONFIRM BUTTON.
3. TURN THE JOG DIAL TO SELECT "M Line".
PRESS THE CONFIRM BUTTON.
THE NEEDLE POSITION WILL BE INITIALIZED.
4. THE NEEDLE BAR IS AT CENTER NEEDLE
POSITION (060).
BE SURE THAT "M Line" SIGNAL SHOULD BE "ON"
(FIG.1).
IF NOT, ADJUST THE CENTER NEEDLE POSITION
SENSOR AS FOLLOWS.
[ADJUSTMENT]
5. OPEN THE FACE PLATE.
REMOVE THE TOP COVER (SEE PAGE 1).
6. BE SURE THAT THE NEEDLE BAR IS AT
"060" POSITION (CENTER NEEDLE POSITION).
LOOSEN THE SETSCREW.
ADJUST THE SENSOR POSITION BY MOVING THE
SENSOR PLATE IN THE DIRECTION OF ARROWS
SO THAT THE "M Line" SENSOR SHOULD BE "ON"
WHEN THE NEEDLE BAR IS AT "060" POSITION.
TIGHTEN THE SETSCREW.
* BE CAREFUL NOT TO TOUCH THE SENSOR
BOARD WITH A SCREWDRIVER WHILE THIS
ADJUSTMENT.
WHEN THE NEEDLE BAR SUPPORTER IS PUSHED
RIGHT AND LEFT VERY LIGHTLY WITHIN THE
RANGE OF PLAY. BE SURE THAT THE "M Line"
SENSOR WILL NOT BE TURNED "OFF".
7. PRESS THE RIGHT ARROW OF
BE SURE THAT THE "M Line" SENSOR IS "OFF"
WHEN THE NEEDLE BAR IS AT "044" (LEFT) AND
"076" (RIGHT) POSITION. IF NOT, LOOSEN THE
SETSCREW AND ADJUST THE SENSOR POSITION
AGAIN.
8. ATTACH THE TOP COVER.
TURN OFF THE POWER SWITCH.
9. CLOSE THE FACE PLATE.
29
BUTTON.