Tech: Battlezone Vectors Everywhere

I have this Battlezone that has this strange problem. Here are the symptoms:
- At bootup the game has the sound like the tank running (just keeps making
the same sound always)
- When the monitor becomes visible, it has vectors everywhere. Almost no
text. If text shows up, it only shows for an instant and then in the wrong
place. Sometimes it is stair-stepped down from upper left to lower right
with seemingly random locations.
- Vectors are drawn everywhere and at random
- The moon is lower center on the screen
- Mountains are present
- Vectors seem to always be drawn from above or the left of the screen
- Random objects appear in the center of the screen
- Test mode blanks the screen
- Every once in a while, the radar appears in the center of the screen -
again, random scale
- Coin up registers credits on the counter, but the game will not start
- Voltage on the PCB seems fine. +5V DC, no AC

Has anyone seen these problems before. Is this a combination of problems?

Is there a BZ repair FAQ somewhere?

Thanks.

Mike Appolo
http://www.appolo.com

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Received on Sun Aug 27 00:15:54 2000