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

If you grabbed the schematics , print out page 7A. Once you can figure out why
your watch dog circuit is going nuts you should be ok. Perhaps the 74ls74 at 6R?
just a guess.

The watchdog related stuff is on the left side of the page. The whole left side
of 7A is interconnected, keep in mind.

JB

Stempak Arcadius-ASTEMPA1 wrote:

> Joe,
> ^^^^
>
> Well I checked All of the Parts which you had
> previously Suggested Checking and which again were:::
>
> ===============================================================
>
> 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
>
> ===============================================================
>
> However and in every instance, of the above Chips / Pins
> rather than get No Pulse, I, in every instance, noted that
> Each Pin Produces a Pulse (Very Rapid HIGH / LOW / HIGH / LOW Pulse)
>
> Also and at this time if I GND the WDDIS PIN, the RST LINE on my
> CPU Goes HIGH rather than Very Rapid HIGH / LOW / HIGH, etc...
>
> However and even with the RST LINE HIGH or not HIGH, does not matter,
> the IRQ Line on Pin 3 of the CPU if I recall correctly, is Always LOW.
>
> I traced this IRQ Line to a 7474 Type CHIP and even replaced this Part
> but to no avail, IRQ is still Low.
>
> Does anyone have any other Ideas ???
>
>
>
> Arcadius............. :-)
>
> -----Original Message-----
> From: Stempak Arcadius-ASTEMPA1
> Sent: Wednesday, September 25, 2002 4:03 PM
> To: 'vectorlist@synthcom.com'
> Cc: Stempak Arcadius-ASTEMPA1
> Subject: RE: VECTOR: 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 Thu Sep 26 21:19:52 2002