HE-800C
11. TROUBLESHOOTING
80
Cause Check Remedy Page
Work clamp Work clamp pressure Increase work clamp pressure.
* The standard height of the adjustment screw is
approximately 30 mm, so tighten it further than this.
67
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)
*
Rotary hook 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.
65*
66*
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.
67*
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 clamp 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 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.)
*
69*
*
3999Q
3998Q
Roller
Cam
Screw
Lower thread
clamp
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