Test Pattern Assessment - Bernina 820 Service And Maintenance Manual

7.2 Test pattern assessment

Test pattern assessment
Point/Area
The two stitching lines must be on top of
A
each other.
B Circle Circle must close at point B.
C Satin The stitches must lie densely together.
stitching
D Fill Stitch Stitch density (X-Direction) must be even.
E Must match first diagonal row.
F Must be parallel to first diagonal row.
G Fill Stitch Stitch density (Y-Direction) must be even.
H Satin stitch The stitches must lie against each other.
I Must match corner row.
J Must match corner row.
K The stitching line coming down to point K,
must be in line with the first row of stitches
made after the starting point (+/- 0,5mm).
L Corner point must match.
M Must match fill (point D).
N Corner point must match.
BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland
L
K
H
I
Desired status:
J
A
B
G
F
C
M
D
E
N
Possible cause:
Reference point not adjusted.
Speed too high, belt tension too
weak/strong.
X- and Y-Axis sluggish movement. Belt
tension too weak/strong.
Sluggish movement caused by threads,
fluff, etc. in the drive. Belt tension too
weak/strong.
X-axis stiff-driving (carriage or drive
gears).
Y- or X-Axis sluggish movement
(carriage or drive gears).
Y- or X-Axis sluggish movement
(carriage or drive gears).
Y-Axis sluggish movement (carriage or
drive gears).
Sluggish movement caused by dirt in the
drive gears (probably thread remnants)
Y- or X-Axis sluggish movement
(carriage or drive gears).
Y- or X-Axis sluggish movement
(carriage or drive gears).
Y- or X-Axis sluggish movement
(carriage or drive gears). Fabric hooped
incorrectly. The hoop: mark hoop outline
with a pencil to see if the fabric moves.
Y-axis sluggish movement (carriage or
drive gears).
Y- or X-Axis sluggish movement
(carriage or drive gears).
Y- or X-Axis sluggish movement
(carriage or drive gears).
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