Brother International HE-800A Instruction Manual - English - Page 115

Work clamp is not raised 2 Pulse motor stepping sound can be heard

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16. TROUBLESHOOTING Work clamp is not raised (2) Pulse motor stepping sound can be heard Cause Machine stopping position Check Rotary hook touches lower thread retainer at the stop position Remedy Adjust the needle up stop position. Retainer Inner rotary hook presser Page 77 4021Q Work clamp lifting Work clamp lifting speed Use memory switch No. 02 to retard the work clamp speed is too fast. setting lifting speed. 79 Upper scissors thread Interference between Check the standard adjustments with the upper upper thread scissors and thread scissors removed. 75 work clamp * Be particularly careful when sewing joints. Upper thread scissors Apply grease to the inclined face of the opening operation cam. 76 Lower thread trimmer Interference between Repair or replace the parts. fixed knife set, lower Lower thread thread clamp, lower trimmer link A assembly thread presser and lower thread retainer. Lower thread trimmer connecting rod - Remove the shoulder screw to check. 4022Q Rubbish, dust or thread Remove all rubbish, dust and thread scraps from the scraps present lower thread trimmer. - Loose screws Check for loose screws in Securely tighten all screws. the upper thread trimmer, lower thread trimmer and - work clamp lifter mechanisms. Work clamp lifting Check the work clamp Change the settings of memory switch Nos. 04, 05, height setting lifting height setting. 06. * If the work clamp lifting height is too high, the lower thread trimming operation will not be timed 79 together with the work clamp rising and the pulse motor may go out of step. Threading Lower thread threading Insert the bobbin correctly and pass the lower thread through the bobbin case correctly. * If the bobbin is inserted back-to-front, it will spin 60 loosely and the presser lifter may go out of step. Lower thread tension Reduce the lower thread tension. * If the lower thread tension is too strong, the motor may go out of step. Use memory switch No. 02 to reduce the work clamp lifting speed setting to make the lifting speed slower. 61 79 Buff this section to reduce the thread retaining resistance. 4023Q 107 HE-800A

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HE-800A
16. TROUBLESHOOTING
107
１６
-
２４
. Work clamp is not raised (2) Pulse motor stepping sound can be heard
Cause
Check
Remedy
Page
Machine
stopping
position
Rotary
hook
touches
lower thread retainer at
the stop position
Adjust the needle up stop position.
77
Work
clamp
lifting
speed is too fast.
Work clamp lifting speed
setting
Use memory switch No. 02 to retard the work clamp
lifting speed.
79
Interference
between
upper thread scissors and
work clamp
Check the standard adjustments with the upper
thread scissors removed.
* Be particularly careful when sewing joints.
75
Upper
thread
scissors
Upper
thread
scissors
operation
Apply grease to the inclined face of the opening
cam.
76
Interference
between
fixed
knife
set,
lower
thread
clamp,
lower
thread presser and lower
thread retainer.
Repair or replace the parts.
-
Lower thread trimmer
Rubbish, dust or thread
scraps present
Remove all rubbish, dust and thread scraps from the
lower thread trimmer.
-
Loose screws
Check for loose screws in
the upper thread trimmer,
lower thread trimmer and
work
clamp
lifter
mechanisms.
Securely tighten all screws.
-
Work
clamp
lifting
height setting
Check the work clamp
lifting height setting.
Change the settings of memory switch Nos. 04, 05,
06.
* If the work clamp lifting height is too high, the lower
thread trimming operation will not be timed
together with the work clamp rising and the pulse
motor may go out of step.
79
Lower thread threading
Insert the bobbin correctly and pass the lower thread
through the bobbin case correctly.
* If the bobbin is inserted back-to-front, it will spin
loosely and the presser lifter may go out of step.
60
Threading
Lower thread tension
Reduce the lower thread tension.
* If the lower thread tension is too strong, the motor
may go out of step.
Use memory switch No. 02 to reduce the work
clamp lifting speed setting to make the lifting speed
slower.
61
79
4021Q
Retainer
Inner rotary
hook presser
4022Q
Remove the shoulder
screw to check.
Lower thread
trimmer link A assembly
Lower thread
trimmer
connecting rod
4023Q
Buff this section to reduce the
thread retaining resistance.