Re: NEED SOME HELP with a DEAD STAR WARS BOARDSET....

A quick look at page 7A of the schematics shows me this:

Reset comes from pin 6 of 6R. This is also pin V on the main board connector and
pin 12 of 6E. (this is all Watchdog circuit stuff so far.) Also we have pin 1 on
3R (Interrupt Timer.)

So, if this is staying Low, check for a pulse at pin 5 of 2R (pin 3 of 6R.)
Chances are there's no pulse. 6E is an AND gate so, with a pulse from 6R, it
should pulse too.

If no pulse at 6R, check pin 2 of 6R.

So, someone correct me if I am wrong.

JB

Stempak Arcadius-ASTEMPA1 wrote:

> Joel,
> ^^^^^
>
> Great idea, but unfortunately I already
> tried this with no change to the problem.
>
> In fact I also replaced the CPU, and noted
> that the RESET LINE (RST) is still LOW.
>
> It must be something before the CPU (PIN#37)
> holding the RESET CKT LOW, but I have yet
> for the life of me, to figure out what that is.
>
> Arcadius.......... :-)
>
> -----Original Message-----
> From: Joel Rosenzweig [mailto:joel.rosenzweig@verizon.net]
> Sent: Tuesday, September 24, 2002 7:11 PM
> To: vectorlist@synthcom.com
> Subject: Re: VECTOR: NEED SOME HELP with a DEAD STAR WARS BOARDSET....
>
> Try liftting the reset pin on the 6809, tie it high, and see if you make
> any further progress
>
> Joel-
>
> ----- Original Message -----
> From: "Stempak Arcadius-ASTEMPA1" <ASTEMPA1@motorola.com>
> To: <vectorlist@synthcom.com>
> Cc: "Stempak Arcadius-ASTEMPA1" <ASTEMPA1@motorola.com>
> Sent: Tuesday, September 24, 2002 4:48 PM
> Subject: RE: VECTOR: NEED SOME HELP with a DEAD STAR WARS BOARDSET....
>
> > Anthony,
> > *******
> >
> > I attempted to Trace back from the RESET CKT
> > and indeed at the point where the GND and RESET
> > POINTS on the Board are present the RESET PIN is
> > Stuck LOW all the time.
> >
> > Does anyone, or yourself, know what IC's
> > actually make up the RESET CKT Going back up
> > to the 6809 CPU ???
> >
> > O.K. a lot to ask for but thought I would ask
> > just the same.
> >
> >
> > Arcadius....... :-)
> >
> > -----Original Message-----
> > From: Anthony Ramos [mailto:aramos@ele-mental.org]
> > Sent: Tuesday, September 24, 2002 12:56 PM
> > To: vectorlist@synthcom.com
> > Subject: Re: VECTOR: NEED SOME HELP with a DEAD STAR WARS BOARDSET....
> >
> >
> > Right. A correctly functioning watchdog circuit only *pulses*
> > the RESET line, then watches again, and pulses again, if
> > necessary. On a bad board with a good watchdog, it does
> > this: ~~~~~_~~~~~_~~~~~_~~~~~_~~~~~ etc.
> >
> > RESET stuck low is almost certainly due to a bad watchdog
> > circuit. If you don't have schematics, or you can't read them,
> > maybe someone here can help.
> >
> > By they way, have you made sure the reset *button* isn't "stuck
> > low"? ;-)
> >
> > -aramos
> >
> > On Monday, September 23, 2002, at 09:30 PM, Stempak
> > Arcadius-ASTEMPA1 wrote:
> >
> > > So question is, since the RST on the CPU on this STAR WARS MAIN is
> > > Always Stuck LOW, and from what I read should Only go LOW when
> > > the Board is
> > > actually RESET.
> > -
> > Anthony Ramos -- aramos@ele-mental.org / aramos@hyperreal.org
> > phone: 503.236.6303 / mobile: 503.267.3519
> > 600 Southeast 39th Avenue #3, Portland, Oregon 97214 USA
> >
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Received on Tue Sep 24 22:31:08 2002