Re: R: I: STAR CASTLE PCB with a "little" problem - SOLVED - Yet Another Cine Board to Repair - FIXED

From: Kevin Moore <talon.k_at_gmail.com>
Date: Thu Jun 23 2011 - 09:09:11 EDT

Since we are on the subject of Star Castle boards. Who here repairs these
state side? I've got to many projects on my plate, but would like to get
mine repaired.

Thanks,

Kevin

On Thu, Jun 23, 2011 at 6:45 AM, vernimark <vernimark@vernimark.com> wrote:

> >I suggested working
> >from the video output backwards starting with M2 because it is the
> >data latch for the lowest nibble of the Y axis on the video port J2
>
> Yes, that what I wanted to do in the beginning but after some discussions I
> had here I was convinced it was an ALU problem so I started from there...
>
> ABOUT YESTERDAY PROBLEM topic: Yet Another Cine board to Repair
> This is what I saw...
> http://www.vernimark.com/temp/cinematronics01.jpg
>
> FIXED!
>
> It was a faulty 7402 in H8 position ("Line Counter - to LF13331").
> Now:
> http://www.vernimark.com/temp/speedfreak01.png
>
> it was a CINEMATRONICS BOARD REVISION B with SPEED FREAK ROMs and it seems
> roms are not compatible with that PCB release (you can see only the upper
> part). I swapped ROMS from my VECTORBEAM PCB with STAR HAWK Roms (working)
> and now both of them work fine and (MOST IMPORTANT) a cinematronics game
> has
> a cinematronics PCB and my future speed freak cab will have a vectorbeam
> pcb
> :)
>
>
> How could I find the damned faulty 7402???
> It's a shame but I hadn't ANY IDEA about the reason of that so I just
> checked all components with HP logic comparator... I changed some 74107
> because I had some false positive, probably because I used for comparison
> an
> HC and it was too fast to compare with LS and lights blinked when 107
> chanced status. 4 hours at all, 1x7402, 4x74107, 2xbattlestar galactica
> episodes
>
>
> Regards,
> vernimark
>
>
>
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of William Boucher
> Sent: giovedý 23 giugno 2011 1.21
> To: vectorlist@vectorlist.org
> Subject: Re: R: VECTOR: I: STAR CASTLE PCB with a "little" problem -
> SOLLVED
>
> Congratulations on your success. Good job. I can't believe how close to
> calling this one I was. In my post from June 7, 2011, I suggested working
> from the video output backwards starting with M2 because it is the data
> latch for the lowest nibble of the Y axis on the video port J2. It
> actually
>
> turned out to be the very next chip in line, N4 that provides the data
> directly to the M2 latch. I think that was a pretty good guess. It feels
> good to be at least in the ball park for once.
>
> I saw your picture of your next board to fix that you posted today. I
> haven't got a clue about that one.
> Best of luck :-)
> Keep us posted.
>
> William Boucher
> http://www.biltronix.com
>
>
>
> ----- Original Message -----
> From: "vernimark" <vernimark@vernimark.com>
> To: <vectorlist@vectorlist.org>
> Sent: Wednesday, June 22, 2011 6:28 AM
> Subject: RE: R: VECTOR: I: STAR CASTLE PCB with a "little" problem -
> SOLLVED
>
>
> As you know I started from this condition:
>
> http://www.youtube.com/watch?v=n9h0c9qYkZM
>
> After some checks the problem was in a faulty 74194 (4-BIT BIDIRECTIONAL
> UNIVERSAL SHIFT REGISTERS) in position N4: Secondary accumulator, logic
> block 3
>
> regards,
> vernimark
> www.vernimark.com/arcade
>
>
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of vernimark
> Sent: mercoledý 8 giugno 2011 16.43
> To: vectorlist@vectorlist.org
> Subject: RE: R: VECTOR: I: STAR CASTLE PCB with a "little" problem
>
> Monitor is ok (star hawk and armor attack work well), this evening I'll
> check the PCB flat connector
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Christopher X.
> Candreva
> Sent: mercoledý 8 giugno 2011 16.25
> To: vectorlist@vectorlist.org
> Subject: Re: R: VECTOR: I: STAR CASTLE PCB with a "little" problem
>
> On Wed, 8 Jun 2011, vernimark wrote:
>
> > I'm sorry for the quality of my video, but if you look it carefully you
> can see the "rings" of the castle
> > shake a little bit. But if you look more carefully the rings don't shake
> , they are simply drawn with some
> > segment vertex wrong for a short time, just a "frame" (I know we don't
> have frames in vector games). The same
> > happens with the animy starship: when it rotates in some positions and
> for
> a very short time, some vertex are
> > wrong. So definitely it is not a problem limited to one object.
> > I already changed 181 TTL RAMs and ROMs
>
> If it's all objects then maybe it's one of the DACs, either a stuck pin or
> just one "bit" with a desoldered pin.
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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Received on Thu Jun 23 09:09:19 2011

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