Atari Tempest - Page 17

Tempest™
Figure
6
Self-Test
Procedure
Part
2,
continued
Instruction
Test
Passes
Test Fails
2.
Activate
start,
fire,
Superzap,
SLAM,
and
coin
switches.*
As
switch
activates,
you’ll hear a
beep
and
0
changes to
1 on the
screen.
You
will not
hear
a
beep
and
0
will remain
on the screen
for the defective switch.
3.
Rotate
encoder
wheel
clockwise and
counterclockwise.
The
right
hexadecimal
number
on the
screen
will
increase
with
counter
clockwise
mo-
tion, and
decrease
with
clockwise mo-
tion.
Incorrect
progression
of numbers
indicates
encoder wheel harness wires
were con-
nected
incorrectly.
No
number change
indicates encoder
wheel is
bad
or harness
wires
are loose.
4.
Observe the
white
frame
around
the
outside
of the
screen.
Each
frame
corner
should be
within
Vi-inch
of each
moni-
tor
bezel
corner.
See
Tempest™
Drawing
Package
to
adjust video
pots.
5.
Activate
SLAM
switch.
A
white cross
hatch
pattern appears.
A
character
set
appears
at the
bottom
of the
screen.
If
display
is not
centered
and
symmetrical on the
monitor, adjust video pots (see
Tempest
Drawing
Package) on the
main PCB. If
character
set
is incorrect,
check Vec-
tor ROMs (see
Troubleshooting
Guide).
6.
Activate
SLAM
switch.
Horizontal and
vertical
lines
cross
in the
cen-
ter
of the screen
dis-
playing a
large “plus”
sign.
Audio I/O
1 and
2
alternate to
produce
four tones.
Lines
not
crossing
indicates video pot
on main PCB needs
adjusting (see
Drawing
Package for
procedure).
No sound indicates
failure of an audio
amplifier and/or the
custom
audio
chip(s).
7.
Activate
SLAM
switch.
Tests
purple,
cyan,
yellow,
white, green,
blue, and red
for
color
and
intensity.
Displays
seven
groups of
verti-
cal lines,
each with
right line
the
brightest
and
left line the
dim-
mest.
Use
this
pattern for
tracking adjustments (see
the Color
X-Y Monitor Manual).
8. Activate
SLAM
switch.
A checkerboard
pat-
tern
touches the
sides
and
corners of the
monitor.
Rotate the
control knob to
change
color.
Use
this pattern
for purity and convergence
adjustments (see
Color X-Y Monitor
Manual).
9.
Activate
SLAM
switch.
A
white frame
is dis-
played
on the
screen.
Perform
math-box
signature analysis (see
Troubleshooting
Guide).
10.
When
satisfied
with test,
set
self-
test
switch to
off
position.
*
Activate
coin
switches
by
inserting at
least one
coin
in each
coin slot.
You will not
trip the
coin
counters
as
long as
you are
in
self-test.
9