Re: Re[2]: Re: Battlezone - no vectors in game

On this problem, I tried reconnecting pin 7 A5 and cutting A6, but the
board doesnt work, only works with pin 7 (A5) cut. The line is not
holding high or low (checked on a scope) but I am going to try
replacing the LS139 that the signal goes to on the AUX board anyway
just incase.

On another note, I decided to have a go at signature analysing the AUX
board (never dug my sig analyser out before)

Well I dusted off the HP5006A signature analyser

I made the mathbox test harness as described in the manual

I followed the procedure as described in the manual for test #1

when I jumper pin1 of B6 to ground, the signature analyser freezes and
I cant record any signatures

Ok lets try test #2a followed instructions and the sigs all test good
so my HP is working

followed the instructions for test #2b and the signatures are good again

followed the instructions for test #3, and .... errrr is there an
error in the manual? I get all good sigs, but not on the same pins as
the manual

eg pin 22 of H/J2 should be 1441, but its not its pin 21. same applies
for the other 3 pins, they are all 1 shifted to the left

then the same for chip at E/D2, all the sigs are correct but shifted 1
pin to the left.

Board fault or missprint? sounds like a miss print.

Any ideas why I can't do the #1 tests?

Thanks in advance

Luke
>
> -----Original Message-----
> From: lists@arcadeuk.com
> To: vectorlist@vectorlist.org
> Date: Sat, 18 Aug 2007 23:57:32 +0000
> Subject: Re: VECTOR: Re: VECTOR: Battlezone - no vectors in game
>
>>
>> Right, I have been messing about with the board all night, and I have
>> found the problem now (but dont know the solution)
>>
>> I was wiggling the aux board connector about to check continuity and I
>> accidentally pulled off the wire on pin7 (external address 5) and the
>> game sprung to life!
>>
>> Reconnected pin7 and the game goes dead.
>>
>> with pin7 disconnected of course there is a mathbox error, with it
>> connected there is no mathbox error.
>>
>> Any ideas?
>>
>
> without reading the schems, it's a good bet that the line is stuck.
> so look at what chips are driving it and one is probably bad.
>
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Received on Sun Aug 19 12:58:41 2007