10
STAR*TECH JOURNAL/DECEMBER 1983
BALLY MIDWAY
ASTRON BELT
* SELF TEST* BACK DOOR KEY* DEMODULATOR BOARD- DIP SWITCH 1
* DEMODULATOR BOARD (CONNECTORS & ADJUSTMENTS)* BASIC GAME TROUBLESHOOTING
* LASER DISC PLAYER TROUBLESHOOTING & MAINTENANCE* VIDEO DISC PRECAUTIONS
* LASER DISC STORAGE * FALSE ERROR MESSAGE
ASTRON BELT SELF TEST
Grune: Astron Belt
Subject: Self Diagnostic Test
The diagnostic test can be advanced to the next test by pressing the start button
for a reasonable period of time.
When you advance from the input test ( switch test) to the next test the start
button must be held in for a longer period.
After the last diagnostic test, the grune will return to the attract mode
automatically in approximately 30 seconds.
ASTRON BELT BACK DOOR KEY
To prevent theft of the laser disc player, all back doors will be keyed with a
special Illinois Lock, Key #350.
ASTRON BELT DEMODULATOR BOARD - DIP SWITCH 1
The four banks of individual switches on Dip SW 1 are set up so Switches # 1,
#2 and #3 are in the OFF position. Switch #4 should be kept ON.
Dip SW l/N0. 4 determines whether to accept composite negative or
positive going SYNC from the logic boards. Since the logic produces a negative
going SYNC, the Dip Switch 1/No. 4 is left ON.
Dip Switch 1/No. 4
ON- Negative SYNC
OFF - Positive SYNC
ASTRON BELT DEMODULATOR BOARD
(CONNECTORS & ADJUSTMENTS)
CN (F-Type Conn.)
CN2 (26 P Conn.)
CN3 (1 O P Conn.)
CN4 (6 P Conn.)
Dip SW 1 (4 P)
VR1, VR2
VR3, VR4
VRS
Chroma Signal Input from Video Disc Player
Logic Signal Input from Game Board
Power Supply 12-5-0V
TTL Signal Output to Color Monitor
Negative/Positive Switch of Sync Signal (Switch #4 must be ON)
Horizontal Sync/Blanking Timing Adjustment
Vertrical Sync/Blanking Timing Adjustment
Black Level Adjustment (laser video brightness)
INPUT LEVEL ADJUSTMENT OF LOGIC SIGNAL
VR6
VR7
VRB
VR9
VR1 O
VR11
VR1 2
VR13
Red Gain
Green Gain
Blue Gain
Output Level Adjustment of Logic Signal
Image Quality Adjustment (Resolution Control for Laser Video)
Hue Adjustment (Tint Control)
Color Level Adjustment
White Level Adjustment (Contrast ControQ
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3. Grune lights up and plays with sound but loss of video. Check the following:
A. Monitor interface cable and connectors
B. Demodulator PC Q834-05175--000
C. Monitor
4. Grune lights up and fails to play with the loss of sound and video (fuses are
good). Check the following:
A. Tum grune on and off to clear condition
B. Wiring and connectors
C. The disc player must be on and the disc is rotating (power switch red
LED and play green LED is on)
D. 5vdc at logic and demodulator PC boards
E. Switching power supply +5 , +12 & -12
F . Replace logic or demodulator PC board
5. Grune plays with video but loss of sound. Check the following:
A. 3-runp sound fuse
B. Wiring and connectors
C. Volume control and speakers
D. Sound PC 834-5272 .
E. 30vdc to power runplifier 4-pin connector (blue wire)
F . Power amplifier PC QI 10-00019-0000
6. Grune plays with sound but video is distorted Check the following:
A. Clean laser disc and check for damage (use other side if needed)
B. Clean fan filter ( overheating)
C. Adjust demodulator PC or replace
D. Logic PC 834-5270
E. Monitor
NOTES:
1. When powering grune up, allow for the 30-second warmup period (laser disc
playing cycling to 1800 RPM).
2. Laser disc is recorded on both sides.
3. Powering game on and off may clear a lock-up condition (logic has no
watchdog circuit).
ASTRON BELT LASER DISC PLAYER
TROUBLESHOOTING & MAINTENANCE
TROUBLESHOOTING
Before concluding that the player is out of order, please refer to this
troubleshooting guide to make sure that there is not a simple remedy for the
problem. The vast majority of performance problems have their source in set-up
errors, bad connections to other equipment, or malfunctions of other equipm~nl
Find trouble symptom on the chart below, and try the suggested remedies.
SYMPTOM
CAUSE
REMEDY
Lid does not open
• Power cord is not
properly plugged into
AC wall socket
• Power switch is not
turned on.
• Latch is not released.
• Plug in power cord
• Power is not on.
• Plug in power cord
• Turn on power switch.
• Push lid and close it
firmly so latch locks.
Disc does not rotate
• Lid is not-shut
completely
12
ASTRON BELT BASIC GAME TROUBLESHOOTING
1. Grune fails to light up (dead). Check the following:
A. Line cord and 117v outlet
B. 117v switch and safety switch
C. 5-runp fuses (two)
2. Grune lights up and plays with sound but has loss of video and fan operation.
Check the following:
A. Monitor and fan 3-runp fuse
B. Wiring
• Turn on power switch
• Press REJECT/OPEN
button.
Disc stops rotating soon
after starting
• You are playing the
unrecorded side of a
disc.
• Turn over disc.
Disc rotates but there is
no picture.
• Wrong connection from
player to video monitor
TV
• Make correct
connections.
Picture quality is bad
• Bad connections
between player and
video monitor TV.
• Poor disc.
• Check all connections,
particularly BNC type
type plugs.
• Try playing a different
disc. If other discs give
good quality, the problem
is with that particular disc.
Continued on next page.