Star Tech Journal

Issue: 1990-August - Vol 12 Issue 6

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PROCEDURE
INFORMATION:
1. Check the height of the metal "Deep Freeze"
As the ball exits the shooter lane, it should
magnet core above the playfield surface. The
optimum height is approximately 1/32". This
height causes the ball to freeze faster, by reduc-
ing the speed of the ball movement, yet it does
not apparently interfere with other shots.
proceed across the playfield and go up the plastic
ramp (as shown by the dark arrow). Adjustment
of the shooter lane ball guide may be necessary
to obtain this ramp shot.
2. Raise the playfield to allow a straight-bladed
screwdriver blade to tum the core for the proper
height. If necessary, slightly loosen the locknut
securing the core in its bracket. Retighten the
locknut following the height adjustments to se-
cure the core at the desired height.
•••a•••••••••••••••••• •••••••••••••••••••••-•••
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: , • , • . • : . • , • • • • •
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PROCEDURE
1. Check the ball trajectory (path) from the
shooter lane ball guide toward the plastic ramp.
The ball should move smoothly up the ramp
entrance.
~ IMl.w•fw
2. If necessary, loosen the ball guide screw in the
ball guide slot, and reposition the ramp to obtain
the proper ramp entry.
3. To maintain the ball guide position, install
another screw in the Locking Screw hole.
Data East Speed Buggy Sensor PCB
Phillip G. Stewart, Customer Service
Data East USA, Inc.
San Jose, California
SUBJECT
If the optical devices on the IME sensor PCB are
Data East's Service Department has compiled
the following information on the sensor PCBs
used in the accelerator, brake and steering as-
semblies. These PCBs are simple in design and
have a low failure rate, however, your feedback
and requests has prompted us to compile this
information.
not aimed perfectly at one another, the output
signal's LO portion begins to rise above ground
potential (see Figure 1), causing the logic PCB to
ignore the signal.
SENSOR PCB
The sensor PCB used in the upright model
steering assembly is manufactured by IME in
Italy, whereas the accelerator PCB is supplied by
the game's creator, Tatsumi. The three monitor
cockpit version of Speed Buggy utilizes the
Tatsumi produced sensor PCBs exclusively. It
has been our experience that the Tatsumi sensor
PCB is relatively trouble free, whereas the IME
PCB has had a slightly higher failure rate.
STEERING CONTROL
• One of the most common problems experienced
is with losing steering control on the upright
model caused by mis-alignment or failure of the
optical devices used on the sensor PCB. the
input circuitry of the logic PCB requires a perfect
signal from the sensor PCB. This signal is ba-
sically a square wave, but the LO half of the
signal must reach ground potential (O vdc) for
proper operation (see Figure 1).
Jufl ~~:-: ~tn
GCOD
Figure 1
Test Point
1
2
3
4
5
6
Sensor Clear
Sensor Blocked
1.2 vdc
0 vdc
5.0 vdc
1.2 vdc
0 vdc
5 vdc
1.2 vdc
4.5 vdc
0 vdc
1.2 vdc
4.5vdc
0 vdc
NOTES
1. Sensor Clear means that there is no object
between the LED and the photo-transistor.
Sensor Blocked means that an object has been
inserted between the LED and the photo-tran-
sistor. A business card or any flat card stock is
suitable for this purpose.
Ol>T
0-
OUT
b
GND

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