Instruction manual
The
1571
drive:
There
are
two
versions
of
the
1571.
The
early
version
ha~
a stepper
motor
and
head
movement
linkage
functionally
identical
to the
1541.
The
later
version
has
above-dlassis
side-mounted stepper
motor.
To
determine
which
version
you
have,
remove
the 4
screws
from
the underside of the
drive
and
remove
the upper
cover.
On
both
versions
the
chassis
is
divided
into
two
parts, the
drive
assembly
and
the drcult board.
The
later
version
will
have
a thin
metal
shroud
over
the
drive
assembly.
Early
versions
do
NOT
have
this
shroud.
Adjusting
the
early
version
1571
drive:
A helper will
be
requiredl
Remove
the door
latch
lever
(by
pulling
straight out)
and
the
nose
piece.
Remove
the 4
screws
that
hold
the
drive
assembly
to the
plastic
case.
Raise
the
drive
assembly
high
enough
to
gain
access
to the stepper motor
adjusting
screws.
Be
VERY
careful
here
as
the
BACK
of the
drive
assembly
can
crush
electronic components
on
the
FRONT
of the
circuit
board.
The
helper
should
hold
the
drive
assembly
up
as
the
necessary
adjustments
are
made.
Adjustments
are
made
exactly
like
the
1541
drive.
This
is
a
very
awkward
drive
to
align,
which
Is
why
CBM
probably
designed the
above-chassis
stepper motor
on
the newer
1571
drives.
Adjusting
the later
version
1571:
Remove
the 2
ground
straps
from
the
drive
assembly
..
(These
connect
the
drive
assembly
to the
circuit
board),
Remove
the metal
shroud
from
over
the
drive
assembly
and
re-connect
the two straps to the
same
location.
The
stepper
motor
Is
the
black
box
located at the rear left of the
drive
assembly.
loosen
slightly
the
two
stepper motor adjusting
screws.
These
screws
should
be
left
snug,
but not tlght.·The later
version
1571
is
the
easiest
to
gain
access
to the stepper
motor,
but the
most
difficult
to
actually
align
because
of
the
ULTRA
SMALL
adjustments required.
To
make
small
adjustments,
gently
tap
the
front
or
rear
of the stepper motor
with
the
handle
of
the
small
screwdriver,
or
similar
device,
to
move
it
on
its
slotted
mounts
the
microscopic
amounts
required,
as
indicated
by
the
screen
display.
Circuit
Board
Use
caution
herel
Early
Model
1571
Chauls
upright
Access
poru to
~~~~-.:ad~lustment
\;
screws
-----
~.
-
-----
.--~
-_._-_._---'
Lat. Model
1571
Saews
to
remove
cover
xrtwt
o
Stepper
motor
Hub
View
undtr
Ihroud
Stepptr
motor
(undtr
Ihroud)
•