HE-800B
11. TROUBLESHOOTING
79
Cause Check
Remedy
Page
Work clamp pressure
Increase work clamp pressure.
* The standard height of the adjustment screw is
approximately 30 mm, so tighten it further than this.
66
Work clamp
Relation between work
clamp assembly and
sewing length
・
Replace work clamp assembly that fits for sewing
length.
・
When using knits or woven materials, replace the
parts with the -3 specification parts:
Length feed plate (for specification -3), work clamp
assembly (for knits), needle plate 1.2 (for
specification -3)
*
Blunt rotary hook tip
Polish with buff or replace the part.
*
Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
1. Adjust the needle bar height to “1” on the gauge.
2. Adjust the needle and rotary hook timing to “2” on
the gauge.
64*
65*
Rotary hook
Gap between the needle
and the tip of the rotary
hook
Adjust the gap between the needle and the rotary hook
tip to 0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Move the needle bar to the left and right with your
finger, and check that the tip of the rotary hook does
not strike the needle.
66*
Thread tension
Zigzag thread upper thread
tension
Adjust the upper thread tension appropriately.
26, 27
Needle bar play
Vertical and longitudinal
needle bar play
Reduce the needle bar play, or replace the parts.
*
Lower thread retainer cam
Lower thread retainer cam should be sitting firmly on
lower thread clamp plate roller.
*
Thread scraps and dust
blocking area around lower
thread clamp and lower
thread presser
Clean around the lower thread presser.
*
Lower thread clamp
Lower thread clamping
force
・
If the lower thread clamp and lower thread presser
are bent, replace them.
・
Check that the screws are tightened.
*
Needle plate
Relation between material
and needle plate
・
When using knit material, replace with the -3 needle
plate.
・
Replace with a needle plate with a smaller needle
hole.
*
Joint sewing
Angle of work clamp
means that material is not
being clamped.
・
Replace with short work clamp that matches the
sewing length.
・
Use the accessory auxiliary sheet.
・
Process the work clamp assembly to match the joint
section. (Attach or remove rubber.)
*
68*
*
3999Q
3998Q
Roller
Cam
Screw
Lower thread
clamp