Atari 1010

1010C MOTOR SPEED ADJUSTMENT PROCEDURE
(3KHz AUDIO TEST TAPE)
a
EQUIPMENT REQUIRED
Standard Tool Kit
Known-good ATARI computer
BASIC cartridge
ATARI 3KHz Audio Test Tape (FD100221)
PROCEDURE
1.
Disassemble
the
unit
to
the
Troubleshooting
stage
as
described
on
page
3-10.
Follow
the
set-up
procedure
in
the
MOTOR
SPEED
CHECK,
steps
|
and
2
on
page
3-4.
2. Insert the test tape.
3.
Attach
the
scope
probe
to
pin
11
of
the
unused
I/O
connector
on
the
1010
(refer
to
Figure
3-1!
for
pin
locations).
NOTE: Use Pin 4 as referenced ground.
4.
Type
in
POKE
54018,52
and
press
RETURN
on
the
computer.
5. Press the PLAY button on the 1010.
6.
Adjust
the
speed
adjustment
screw
inside
of
the
motor
by
inserting
a
2.0
mm
flathead
screwdriver
through
the
insulated
hole
on
the
bottom
of
the
motor
(see
Figure
4-6).
The
wavelength
of
the
signal
should
be
.33
ms,
as
illustrated
below
in
Figure
4-7.
.33 ms
Ne eae i eli
PONE
V NOW LN
PTX RIT
De a a
Beane eee
a
Figure 4-7, 1010C Speed Adjustment Wavelength
ATARI
1010
Cassette
Recorder
4-2]