11-10
11-11) JUMP MOTOR ADJUSTMENT
Adjustment is required for new or malfunctioning jump motor.
1) Adjusting the Standby Position (adjusting
motor base)
① Unscrew motor base ([Fig.11-20]) and
adjust so that the jump crank roller is
0.3mm away from the controller. Fasten
the screw.
② If the gap is wider than 0.3mm, the
needle may not jump well. If the gap is
narrower than 0.3mm, the jump will
cause noise.
2) Adjusting Jump Manual Clutch
① Jump manual clutch is used to turn the
head off mechanically. If the clutch lever
doesn’t function properly, check the
clutch assembly.
② First, pull the clutch lever forward and
check if the carve on the clutch base is in
line with the center of the clutch pin and
the center of the motor shaft when in
standby (see [Fig.11-21]). If not, unscrew
and adjust the clutch body with the jump
crank roller attached to the stopper.
Fasten the screw back.
③ Pull the clutch lever forward and check if
the clutch body and the stopper are
completely attached. If not, adjust the
stopper to be completely attached to the
body.
[Fig.11-20]
Jump crank roller
Controller
Motor base screw
0.3mm
[Fig.11-21]
Jump
manual
clutch
shaft
Stopper
Clutch
lever
A side
Stopper
Center of motor
Manual clutch
base
Jump
manual
clutch
CAUTION
1. If you will not be using the head with the head ON/OFF switch, make sure to use the jump
manual clutch lever.
2. If the A side of the jump manual clutch does not touch the stopper, when you run the electric
jump you will hear a noise.
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