Atari CX 5200 Field Service Manual page 133

If
the
START,
PAUSE
or
RESET
buttons
fail,
go
to
Flowchart
B,
page 7-12
of this
section.
If
the Keypad(s)
fail(s),
go to
Flowchart BX, page
7-13
of
this
section.
Trakbail
and
Firebutton
Test:
1)
Insert the Missile
Command
cartridge
into
the
Model
5200.
2)
Turn
the
Model 5200 on and
press
START.
3)
By
spinning
the
ball
at a moderately slow
speed, verify that
it
will
cause
the cursor (crosshairs) to
move
in
any
direction.
Be
sure that
it
moves
to
all
extremes
of the screen
(up,
down,
left, right,
diagonal,
and
circular
motions).
NOTE: When
moving
in
diagonal or circular motions, the cursor
will
move
in
slight "steps". This
is
due
to the
type of
programming
used
and
should
not be considered a
trakbail failure (see
Diagonal Motion
Figure
7-4.
Diagonal
or
Circular Motion.
NOTE:
If
more
time
is
required than the attack
wave
allows, simply
press
START
as
needed.
For Cursor
left/right failures, go
to
Flowchart
C,
page 7-14
of this section.
For Cursor
up/down
failures,
go to
Flowchart
D,
page 7-19
of
this
section.
4)
Move
the cursor
to the right border
of
the
screen.
Spin the
ball
as fast as
possible
by hand
in
the
right direction.
This
tests
for "directional
dropouts".
While
spinning the ball
as fast as possible to the
right,
the
cursor should
remain on
the right border.
There
should be no
movement
to
the
left.
Repeat
this
test for the
left,
up,
and
down
directions.
For Left/Right
failures,
go to
Flowchart
E,
page
7-23*
For
up/down
failures,
go
to
Flowchart F, page 7-24.
CX5200
Field
Service
Manual 7-8