Standard Adjustments; Adjusting The Needle Bar Height - Brother HE-800B Instruction Manual

9. STANDARD ADJUSTMENTS

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
NOTE:
• The pulse motor may become hot. Be careful not to touch it when tilting back the machine head.
• Take care when handling the cutter.
Perform the following steps before carrying out the tasks listed below.
1. Turn on the power to carry out home position detection, and then switch the sewing machine to automatic sewing mode or
test feeding mode.
2. Press the THREAD key to switch to threading mode, and then carry out adjustments.
* The work clamp will drop, and the sewing machine will not start up even if the treadle is depressed.

"9-1. Adjusting the needle bar height"

"9-2. Adjusting the needle and hook timing"
"9-3. Adjusting the clearance between needle and hook tip"
"9-8. Adjusting the upper thread trimmer opening timing"
"9-10. Adjusting the bobbin presser"
Turn off the power supply before carrying out all but the above tasks.
9-1. Adjusting the needle bar height
CAUTION
Use both hands to hold the machine head when
tilting it back or returning it to its original position. If
only one hand is used, the weight of the machine
head may cause your hand to slip, and your hand
may get caught.
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
observe all safety precautions.
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.
1. Press the THREAD key to switch to threading mode.
2. Press the
3. Set the needle bar (1) to its lowest position.
4. Remove the rubber cap (2) from the face plate, and then
loosen the set screw (3) of the needle bar clamp.
5. Insert the "1" part of the gauge (4) between the needle
plate (5) and the lower edge of the needle bar (1), and
touch the needle bar against the gauge.
* Different gauges (optional part) are used for each of
the two specifications -2 and -3, so make sure that the
gauge being used matches the specifications and
application for the sewing machine being adjusted.
6. Tighten the set screw (3).
7. Install the rubber cap (2).
8. Press the THREAD key.
4878M
HE-800B
9. STANDARD ADJUSTMENTS
key.
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