Sewing-Off (A-640 Must Be Sewn-Off With The Head Cover Fitted (Light Will Affect The Threader Sensor); External Cleaning - Fritz Gegauf Bernina artista 630 Service Manual

Saving the data before carrying out any servicing or repair work
Customer and machine data must be recorded on a BERNINA USB data stick before starting
servicing or repair work. This is to avoid loss of data when replacing PCBs or updating the
firmware, and for use when comparing with the factory settings. The machine data is saved on a
replaceable EEPROM (Electrically Erasable Programmable Read-Only Memory) on the S-Print.
This EEPROM can only be exchanged with a special tool and in an ESD environmental workplace
(see page 6).
3.3 Sewing-off (a-640 must be sewn-off with the head cover fitted (light
will affect the threader sensor)
Sewing-off is a way of checking whether the adjustments made have had the desired effect, and
that the machine is functioning correctly.
The following stitches should be checked in sequence using the appropriate criteria.
1)
Straight stitch
Is the thread regulator spring
being moved correctly?
Is the row of stitching straight?
Is the thread feed regular?
2)
Zigzag (default values)
Is the stitch formation
symmetrical?
Is the thread feed regular?
Is the fabric free from puckering?
3)
Satin stitch
Is the stitch formation
symmetrical?
Is the thread feed regular?
Is the fabric free from puckering?
4)
Running stitch
Is the stitch formation
symmetrical?
Is the thread feed regular on both
sides?
Is the fabric free from puckering?
5)
Balance using "9" & "Leaf"
pattern

3.4 External cleaning

Caution!
Never use alcohol, petrol, spirits or any other corrosive fluids, or abrasive pastes!
Electrostatic charging may occur during cleaning. To prevent this, use antistatic office-equipment cleaning agents.
We use and recommend "BASF's SURFACE CLEAN" cleaner
suitable for plastic and metallic surfaces.
Is the stitch formation
symmetrical?
The stitched outline in the '9' and
the leaf must correctly meet up.
6)
Any other stitch (e. g.
Honeycomb stitch)
Is the stitch formation
symmetrical?
Is the thread feed regular?
Is the fabric free from puckering?
7)
Buttonhole
Standard buttonhole:
Is the stitch formation
symmetrical?
Are the beads of equal length?
Is the feed correct?
Automatic buttonhole:
Is the stitch formation
symmetrical?
Are the beads of equal length?
Is the feed correct?
Keyhole buttonhole:
Is the stitch formation
symmetrical?
Are the beads of equal length?
Is the feed correct?
Is the stitch formation of the
eyelet part symmetrical?
Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc
8)
Sew-off samples for the
customer
At the end of the service, a
sample is prepared for the
customer so that they can see
how the machine sews after the
service or repair.
This sample should contain the
following stitches:
- Straight stitch
- Zigzag stitch
- Running stitch
- Reverse-fed stitch
- Buttonhole
Should the customer have
complained about any specific
stitch, these should also be sewn
on another piece of fabric and
included.
The sample for the customer
must be the technician's
business card!
9)
BSR foot
Functioning
Even stitching in X/Y directions
10)
Embroidery module
• Test embroidery design or
customer-specific designs if
necessary.
It forms a protective film against static charging, and is
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