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

Joe,
^^^^

 Thank you and You Are the MAN.....

 Here is the latest in my Endeavor to repair this MAIN BOARD.

 Last night, did some additional checking and part swaps
 Swapped out several parts and at this time the NMI, FIRQ Lines
 are HIGH, also the RST (Pin 37) now instead of being a Constant LOW
 Pulses very quickly between HIGH and LOW Continuously.

 Now if I GND the WDDIS Pin the RST LINE then goes HIGH and stays that
 way until I remove the GND, but the Board will not come out of RESET
 STATE (All RED LED's on Board are Constantly ON)

 Also what I can not get to go HIGH is the IRQ LINE, on the CPU
 which stays a Constant LOW and which, from what I have read
 should not be Constant LOW...

 Appreciate your input........

Arcadius........... :-)

-----Original Message-----
From: Joe Bachmann [mailto:joe.bachmann@newmail.net]
Sent: Wednesday, September 25, 2002 12:11 AM
To: vectorlist@synthcom.com
Subject: Re: VECTOR: 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 Wed Sep 25 14:31:50 2002