General - Duerkopp Adler 743-221 Service Manual

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General

This service manual describes the adjustment of the 743-221 model
sewing machine in an expedient sequence.
IMPORTANT !
Various adjustments are mutually interdependent.
The adjustment process must therefore be carried out in the order
given.
IMPORTANT !
The activities described in this Service manual may only be carried out
by specialists or by persons with appropriate training.
Danger of breakage
Before the sewing machine is re-started following dismantling the
necessary adjustments must be carried out as specified in this service
manual.
Avoidance of damage to the material clamps:
The sewing machine must never be operated without material. This
also applies to adjustment work and function-testing.
Adjustment work on stitch-forming components
For all adjustments of stitch-forming components a flawless new
needle must be fitted.
Caution: danger of injury
Before all repair, conversion and maintenance work:
–
turn off the main switch
–
isolate the sewing machine from the pneumatic supply.
Exception:
Adjustment work which is carried out with testing, adjustment or
sewing programs of the control device.
Adjustment work and function-testing with the sewing machine
running
–
When carrying out adjustment work and function-testing with the
machine running, comply with all safety measures and take the
utmost care.
Pedal
–
In the sewing programs the sewing machine can be started by
inadvertently depressing the pedal.
IMPORTANT !
All colour-marked components are factory-set. These settings should
only be altered by specialists.
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