Interchangeability - Galaxy Ranger can be played in an Astron Belt cabinet by changing the laserdisc and the EPROMs,
provided you have the correct EPROMs and disc for that particular hardware setup. See the
Galaxy Ranger Conversion Kit Service Bulletin for more info.
NTSC Demodulator Board - Pots and DIPs - There are 13 potentiometers and 4 DIP switches on the NTSC board. Here are their descriptions:
|VR1 ||Horizontal Sync / Blanking Time Adjustment|
|VR2 ||Horizontal Sync / Blanking Time Adjustment|
|VR3 ||Vertical Sync / Blanking Time Adjustment|
|VR4 ||Vertical Sync / Blanking Time Adjustment|
|VR5 ||Black Level Adjustment (laser video brightness)|
|VR6 ||Red Gain|
|VR7 ||Green Gain|
|VR8 ||Blue Gain|
|VR9 ||Output Level Adjustment of Logic Signal|
|VR10 ||Image Quality Adjustment (resolution control for laser video)|
|VR11 ||Hue Adjustment (tint control)|
|VR12 ||Color Level Adjustment|
|VR13 ||White Level Adjustment (contrast control)|
DIP switches 1, 2, & 3 should be in the OFF position. DIP switch 4 should be in the ON position. DIP switch 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 is
left ON. (ON = Negative Sync OFF = Positive Sync) For more info on the NTSC / Demodulator, see the
Astron Belt Service Bulletins from November 4, 1983, on pages 9-11.
Booting Issues - If your Astron Belt is not booting and/or the laserdisc player plays straight through, check pot VR3 on the NTSC board. This
pot is an adjustment for the sync between the main PCB and the laserdisc player. The PCB must match its timing to the incoming video from the laserdisc
player. If the sync is too far off, the PCB can't communicate with the LD player and it stops functioning. If your game is suffering from one
of the symptoms, try adjusting pot VR3 with the game running. Once the main board can communicate with the laserdisc player, the program will start and
the attract mode will begin to play.
Laserdisc Player - Bally/Midway issued an extremely rudimentary piece of drivel for
Laserdisc Player Troubleshooting and Maintenance
(where "Plug in power cord" and "Turn on power switch" are the most frequently listed remedies).