Star Tech Journal

4 _ _ _ _ _ _ _ _ _ _ SlA~TECH
Cinematronics
Monitor Service Notes and Modifications
"Rip Off" Test Pattern
There exists a test pattern in your Rip Off Game that is enabled
by switch 7 on the dip switch located in position E2 of the main
CPU board (see page 2-2 of manual).
The test pattern is for alignment purposes and should be
adjusted to fill the playfield as shown below:
DD
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To control the width of the display, adjust potentiometer R209
on the monitor. R109 adjusts the height of the picture.
Adjust potentiometers R102 and R202 so that all vectors (line
segments) neatly intersect. R202 controls horizontal line
lengths. R102 adjusts the length of all vertical lines. To center
the picture, adjust the magnetic positioning tabs on the yoke
housing.
Contrast Adjustment on "Rip Off"
There may be too great an intensity difference between the fuel
cells and the ships if your Rip Off game is positioned in a low
ambient light environment. This contrast problem can be solved
by the insertion of a variable resistor in the intensity network.
Replace R1 O (5.6K) with a SK ohm potentiometer. This will
allow the fuel cells to be adjusted to an acceptable level.
DAC-80 Modification
In order to assure prolonged reliability of IC1 (LF13331) on
Cinematronics' monitors, a current limiting resistor is being
added to the outputs of the horizontal and vertical DAC's. This is
a recommended retrofit for all existing systems.
Add 1 each 820 ohm, ¼ watt resistor to underside of board
between pins 15 and 18, per following diagram. Be sure to sever
trace at the indicated location.
Horizontal DAC
IC 201
Vertical DAC
IC 101
This modification does not apply to units equipped with analog
switch substitution board.