Janome 4120QDC - Standard Accessories

3
CONDITION CAUSE HOW TO FIX REFERENCE
6. NOISY
OPERATION
1. BACKLASH BETWEEN HOOK
GEAR AND LOWER SHAFT
GEAR IS TOO GREAT.
2. LOWER SHAFT GEAR IS
LOOSE.
3. INAPPROPRIATE BELT
TENSION.
4. NOT ENOUGH OIL.
5. UPPER SHAFT GEAR IS
LOOSE.
ELIMINATE THE BACKLASH.
ELIMINATE THE LOOSENESS.
SEE PART REMOVAL AND
REPLACEMENT “DRIVING MOTOR
(DC MOTOR)”.
OIL ALL MOVING PARTS.
ELIMINATE THE LOOSENESS.
P. 24
7. DEFORMATION
PATTERN
1. INAPPROPRIATE FEED
BALANCE.
2. TOP TENSION IS TOO
STRONG.
ADJUST THE FEED BALANCING
SCREW.
SEE MECHANICAL ADJUSTMENT
“TOP TENSION”.
P. 15