Checking The Lowest Position Of The Needle - Janome MB-7e Service Manual And Parts List

Checking the Lowest Position of the Needle

Lever type dial indicator
Setscrew
Pointer
13
1. Remove the spool stand, head set right cover (unit)
right cover and left cover (see pages 5 to 6).
2. Turn the handwheel to set the index disk at 270°.
3. Push the needle bar down to engage the needle bar
clutch.
4. Turn the handwheel to set the needle bar at its lowest
position.
Use a lever type dial indicator to measure the needle
bar height.
5. Turn the handwheel clockwise until the indicator reads
0.2 mm and read the angle (Aº) of the index disk.
Turn the handwheel counterclockwise until the indicator
reads 0.2 mm and read the angle (Bº) of the index disk.
Calculate the mean angle (Cº): C=(A+B–360)÷2
Turn the handwheel clockwise to set the index disk at
Cº.
Loosen the setscrews (2 pcs.) and set the pointer at 0º
(L). Tighten the setscrews (2 pcs.) securely.
Check the following items if you have adjusted the
lowest position of the needle.
• Upper shaft timing
• Take-up lever timing
• Hook timing
• Thread cutter timing