4. ADJUSTMENT
HE-800A
78
4. ADJUSTMENT
CAUTION
Maintenance and inspection of the sewing
machine should only be carried out by a
qualified technician.
Ask your Brother dealer or a qualified
electrician to carry out any maintenance and
inspection of the electrical system.
Turn off the power switch and disconnect the
power cord from the wall outlet at the following
times, otherwise the machine may operate if
the treadle is depressed by mistake, which
could result in injury.
•
When carrying out inspection, adjustment and
maintenance
•
When replacing consumable parts such as
the rotary hook
If the power switch needs to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
Use only the proper replacement parts as
specified by Brother.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
Any problems in machine operation which
result from unauthorized modifications to the
machine will not be covered by the warranty.
4-1. Notes on making adjustments
[When turning on the power to make adjustments]
Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the work
clamp before carrying out adjustments.
“¯AdJ” will appear in the parameter display LED and the machine will not operate even if the treadle is depressed.
* Some items are adjusted without the RESET key being pressed. Carry out the adjustment by following the
explanations given.
[When turning off the power to make adjustments]
Do not force any of the parts to move, as doing so may result in damage to the parts.
•
Be sure to turn the machine pulley to raise the needle bar to its highest position before making adjustments.
If this is not done, the pulley position (the direction of rotation of the rotary hook) may cause the lower thread
trimmer mechanism to touch the rotary hook when the lower thread trimmer mechanism operates.
•
When turning the machine pulley, do it at a position where the thread trimmer mechanism will not operate (the
position where the presser foot lifter pulse motor is at the home position).
If the machine pulley is turned at a position where the thread trimmer mechanism operates, the needle may
touch the lower thread trimmer mechanism (lower thread retainer and lower thread trimmer knife).
If the machine pulley is turned at a position where the thread trimmer mechanism operates, the rotary hook and
the lower thread trimmer mechanism may touch.
•
When moving the feed mechanism, do it at a position where the thread trimmer mechanism will not operate (the
position where the presser foot lifter pulse motor is at the home position).
If this is not done, the lower thread retainer and the feed guide shaft may alternately push against the lower
thread clamp and the opening plate, and damage may result.
•
When pushing the knife down by hand, be careful not to let it touch the upper thread scissors.
•
Do not move the feed mechanism while the stop plate of the upper thread trimmer lever is pulled forward and the
upper thread scissors are open (the upper thread trimmer lever is pushed to the left).
Always return the stop plate to its original position before moving the feed mechanism or returning it to the home
position.
