Brother International HE-800B Instruction Manual - English - Page 88

Reduce the needle bar play, or replace the parts., needle bar play

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11. TROUBLESHOOTING Cause Work clamp Rotary hook Thread tension Needle bar play Lower thread clamp Check Work clamp pressure Relation between work clamp assembly and sewing length Blunt rotary hook tip Needle bar height and needle bar lift amount (The gauge is an option part.) Gap between the needle and the tip of the rotary hook Zigzag thread upper thread tension Vertical and longitudinal needle bar play Lower thread retainer cam Remedy Increase work clamp pressure. * The standard height of the adjustment screw is approximately 30 mm, so tighten it further than this. ・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) Polish with buff or replace the 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. 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. Adjust the upper thread tension appropriately. Reduce the needle bar play, or replace the parts. Lower thread retainer cam should be sitting firmly on lower thread clamp plate roller. Cam Roller Page 66 * * 64* 65* 66* 26, 27 * * Needle plate Joint sewing 3998Q Thread scraps and dust Clean around the lower thread presser. blocking area around lower thread clamp and lower * thread presser Lower thread clamping ・If the lower thread clamp and lower thread presser force are bent, replace them. ・Check that the screws are tightened. Screw * Lower thread clamp 3999Q Relation between material ・When using knit material, replace with the -3 needle and needle plate plate. * ・Replace with a needle plate with a smaller needle hole. Angle of work clamp ・Replace with short work clamp that matches the means that material is not sewing length. * being clamped. ・Use the accessory auxiliary sheet. 68* ・Process the work clamp assembly to match the joint * section. (Attach or remove rubber.) 79 HE-800B

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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