Re: Battlezone and -5v

That's what I thought the 15 and -15 were for too.

Going along with the resistor idea, I had previously checked the resistor
R69 since this is an earlier rev board, and C103 was added on to it as an
after thought on this board. The cap was between pin 14 of D9 and R69
instead of between ground and R69. That didn't change anything.

I had been flexing the board to see if there were cold solder joints but
that didn't seem to provide and definite results. So I went ahead and
reflowed all the resistors in the circuit.

So far picture is stable, so I'm pretty sure it was just a cold joint on one
of the resistors.

Thanks for the insight John.

As for the -5V

I have DP-156-01 2nd printing.
Not that I couldn't have missed it, but I've looked all over for the -5v and
or optional components. Maybe I just need more coffee.

Kevin

On Wed, Sep 1, 2010 at 1:05 PM, Darren Finck <dgfinck@yahoo.com> wrote:

> I don't think that's correct. Looks to me (on page 2B of the schematics)
> that the X/Y output amps use +/-15V (generated on the PCB from the +22V and
> -22V).
>
> I recall a few months ago looking hard to find what the -5VDC was used for
> when I was trying to set up a "minimalist" bench test. It looks like it was
> only there for some optional type of ROMs (8316s?). Look at the "Vector
> Generator ROM section of the schems). My PCB did not have any populated
> locations connected to the -5VDC. I powered it up w/o -5 and it ran fine
> (including good video output to the o-scope).
>
> Darren
>
> --- On *Wed, 9/1/10, Rodger Boots <rlboots2@gmail.com>* wrote:
>
>
> From: Rodger Boots <rlboots2@gmail.com>
> Subject: Re: VECTOR: Battlezone and -5v
> To: vectorlist@vectorlist.org
> Date: Wednesday, September 1, 2010, 12:20 PM
>
>
> So the XY outputs can swing negative.
>
> On Sep 1, 2010 11:18 AM, "Kevin Moore" <talon.k_at_gmail.com<http://mc/compose?to=talon.k@gmail.com>>
> wrote:
>
> Dumb question, what is the -5v for on BZ?
>
> Kevin
>
>
>

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Received on Wed Sep 1 16:09:30 2010