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Chapter
3
Troubleshooting
C3>
This chapter includes troubleshooting
procedures
for
the Tetris™
kit.,
Video Display Sync
Problems
Some
video
displays
cannot use
the
composite nega-
tive
sync
that
is
on
the
JAMMA
connector.
Tetris
in-
cludes
a
standard
Atari video-
connector
(located
at
15K)
that
provides separate
positive sync. Refer to
Table
3-1
and
make
the appropriate
connections
for
your
video
display.
Horizontal
Shifting
If
you
cannot
center the
video
display
horizontally,
you
can cause
more
horizontal
shifting
by
.removing
R2 and adding
a low-resistance
resistor (less
than
100.0)*
or a
wire
in
one
of
the locations
marked
R1
or
E.4
(but
not
both).
In
Case of
Difficulty...
No
Raster/No Video
•
Check
the
AC
power
cord,
,is
Check
the
line fuse.
*
Check
the
monitor
brightness.
Table
3-1
Atari
Video Connector
Pin Assignments
Pin
Signal
i
••
-
Red
•
|
C;/:
3
GND
|
-Key
-
(no
connection, required)
j
4
Green
.
•
|
•'6
7
Blue
GND
I-
8
wee
GND
Negative composite sync
Positive
V
sync
:
•
•;
-
Positive
IT
sync
*
Check
the
power
switch.
*
Check
all
solder
connections
on
the
line
filter
and
transformer.
*
Check
that
the
56-
pin
PCB
connector
is
properly
at-
tached.,
Raster/No Video
*
Check
all
PCB
to
monitor
connections.
*
Check
the
power
supply
voltage
on
the
PCB.
No
Video/Game Sounds
Can
Be Heard
*
Check
monitor
brightness,
*
Check
all
PCB-to-monitor
connections.
Incorrect Colors
*
Monitor needs
degaussing,
*
Check
for
proper wiring between,
the
PCB
and
monitor
*
Check
monitor
adjustments
and
adjust,
if
necessary.
Wavy
Picture
*
Check
that
the
monitor
ground
is
properly connect-
ed
to
the
monitor
*
Be
certain
sync
inputs are properly
connected
to
the monitor,
*
Check
the horizontal
hold
adjustment.
Vertical;
EoWHorteoiital
Roll/Horizoiital
Tear
*
Check
the horizontal
and/or
vertical
adjustments,
*
Check:
for
proper
wiring of
sync
from
the
PCB
to
the
monitor
Picture
Upside
Down
*
Switch
the horizontal
and/or
vertical
yoke
wires of
the monitor.
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