tech: Vector monitor

[marog_uk]

I'got a technical a problem with a Hantrex Vector monitor fitted to an Asteroids clone. The following links should show you want the problem looks like when the machine is in test mode:

http://www.marog.freeserve.co.uk/images/asteroids1.jpg

http://www.marog.freeserve.co.uk/images/asteroids3.jpg

I think I saw a post a while back from someone with a similar problem, can't find it in the archives though. Any advice or pointers to helpful information anyone could give would be most appreciated. Cheers, Steve

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[John Bennett]

Hi Steve

It looks very much like a problem I had with my asteroids

it was traced to the asteroids pcb and not the monitor

it was in the Y output section of the vector generation circuitry

traced to a couple of TTL's

if you check to see which of the TTL's have pcb tracks going to the ADC's then you will have a good idea on which ones to start replacing

Mark

DATA Imported from archives: originally posted by markgwilliams (markgwilliams@ntlworld.com)

 

[marog_uk]

Re: [ukvac] tech: Vector monitor
Mark,

You are right it is the board. I connected a scope upto the X & Y outputs
on the board and got the same result. I shouldn't have asumed it was the
monitor without checking first!

Cheers, Steve

>From: "markgwilliams" <markgwilliams@ntlworld.com>
>Reply-To: ukvac@egroups.com
>To: <ukvac@egroups.com>
>Subject: Re: [ukvac] tech: Vector monitor
>Date: Fri, 8 Dec 2000 13:46:54 -0000
>
>Hi Steve
>It looks very much like a problem I had with my asteroids
>it was traced to the asteroids pcb and not the monitor
>
>it was in the Y output section of the vector generation circuitry
>traced to a couple of TTL's
>
>if you check to see which of the TTL's have pcb tracks going to the ADC's
>then you will have a good idea on which ones to start replacing
>
>Mark
>
>
>
>