No Text on Black Widow Board

Have a problem with a Black Widow board I am hoping someone can help me out with. When the game is powered up, the game comes up and you can see the web, spider, and the enemy insects. BUT there is no text (insert coins, high score, etc) visible. In place of the text are a few random vectors - but nothing legible.
 
When the Black Widow logo comes up on the screen, it jitters very rapidly, and the rest of the vectors crash to the lower left portion of the screen. At that time, the game locks up, the monitor chatters, and the spot killer led on the monitor comes up (at which time I turn the game off before it kills the monitor).
 
I can get into the test mode - but nothing is legible because there is no text!
 
All of the socketed chips (ram, rom, cpu, pokey, etc) have been verified in a perfectly working board in a perfectly working Black Widow cab. I have done checksums on the roms and they check out ok. I also verified the sockets - they seem fine also. The board is getting the correct voltages (checked on the board at the test points).

Surely someone has seen this problem on a vector board before. Any help would be appreciated!

Thanks

Walt
 

---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to neil@synthcom.com.
Received on Wed Mar 22 11:25:09 2000