TECH: Stern MPU-200

Archived from groups: rec.games.pinball (More info?)

you need 100ns 5101's for mpu200.
Also you can try Leon's test chip, the mem test should point to which
5101 is bad.
also I know you traced pins, but look for adjacent shorts in the
socket. (pin to pin). Also the socket contact point might be ok for
testing, but won't conduct with a chip in there. I'd replace the socket
anyway.

Archived from groups: rec.games.pinball (More info?)

Possible to have several bad 5101s, too...

Have any other pins to 'test' them in?

Fred
TX
CARGPB#8
========================

Dave Martin wrote:

So, I installed a new chip and traced all pins
> on that U8 chip and they all check out OK. This rules out the socket. Also
> double checked the socket on U7 and they all trace/check out ok. I mean I
> can put in a new socket but if they all trace to the next destination, is
> that necessary??
>
> What is the next thing to look at here? I can't find any more info after
> googling or looking at Clay's site. Any help as to what to look for would
> be appreciated.
>
> Thanks!!!
>
> Dave Martin

Archived from groups: rec.games.pinball (More info?)

Its been a while since I've had that exact same problem, but its one
of the chips on the left of the cpu (I think U18). Follow the R/W line
from the 5101 on the schematics, it will lead you to the chip.........

rare but it happens...& if you've done all the 5101 things on the
bottom...

Greg

On Thu, 08 Sep 2005 19:07:30 GMT, "Dave Martin" <pinballs@ptd.net>
wrote:

>OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a Galaxy)
>has NO acid damage and there is no battery. I've installed brand new roms
>and jumpered accordingly. The LED flashes 2 times and I get 2 "dings" at
>power on. I know everything points to the 5101 U8 chip being the reason it
>won't get to the 3rd flash. So, I installed a new chip and traced all pins
>on that U8 chip and they all check out OK. This rules out the socket. Also
>double checked the socket on U7 and they all trace/check out ok. I mean I
>can put in a new socket but if they all trace to the next destination, is
>that necessary??
>
>What is the next thing to look at here? I can't find any more info after
>googling or looking at Clay's site. Any help as to what to look for would
>be appreciated.
>
>Thanks!!!
>
>Dave Martin
>

Archived from groups: rec.games.pinball (More info?)

Stern MPU-200 uses TWO 5101's- U8 *and* U13- they work together (for 8-bit
addressing rather than 4-bit?). So you may have a bad U13- not U8...

Ray J.
--
Action Pinball & Amusement, LLC
Salt Lake City, Utah USA
Web: www.actionpinball.com

We're serious about pinball. Anything else is just for fun!



"Dave Martin" <pinballs@ptd.net> wrote in message
news:SZ%Te.370$lb.36273@news1.epix.net...
> OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a
Galaxy)
> has NO acid damage and there is no battery. I've installed brand new roms
> and jumpered accordingly. The LED flashes 2 times and I get 2 "dings" at
> power on. I know everything points to the 5101 U8 chip being the reason
it
> won't get to the 3rd flash. So, I installed a new chip and traced all
pins
> on that U8 chip and they all check out OK. This rules out the socket.
Also
> double checked the socket on U7 and they all trace/check out ok. I mean I
> can put in a new socket but if they all trace to the next destination, is
> that necessary??
>
> What is the next thing to look at here? I can't find any more info after
> googling or looking at Clay's site. Any help as to what to look for would
> be appreciated.
>
> Thanks!!!
>
> Dave Martin
>
>

Archived from groups: rec.games.pinball (More info?)

Thanks for the replies. I've got the right 5101, 100ns. I guess I'll
replace the socket just to be sure I can rule that out, but I did check for
shorts from pin to pin and found nada. I did test the 5101 in my Seawitch
and it works fine, so I know the chip is good.

Also for what it's worth, I'm tracing from the top of the chip's pin leg to
the next point when I trace.

Thanks again,
Dave


"Dave Martin" <pinballs@ptd.net> wrote in message
news:SZ%Te.370$lb.36273@news1.epix.net...
> OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a
> Galaxy) has NO acid damage and there is no battery. I've installed brand
> new roms and jumpered accordingly. The LED flashes 2 times and I get 2
> "dings" at power on. I know everything points to the 5101 U8 chip being
> the reason it won't get to the 3rd flash. So, I installed a new chip and
> traced all pins on that U8 chip and they all check out OK. This rules out
> the socket. Also double checked the socket on U7 and they all trace/check
> out ok. I mean I can put in a new socket but if they all trace to the
> next destination, is that necessary??
>
> What is the next thing to look at here? I can't find any more info after
> googling or looking at Clay's site. Any help as to what to look for would
> be appreciated.
>
> Thanks!!!
>
> Dave Martin
>

Archived from groups: rec.games.pinball (More info?)

Dave Martin wrote:

>OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a Galaxy)
>has NO acid damage and there is no battery. I've installed brand new roms
>and jumpered accordingly. The LED flashes 2 times and I get 2 "dings" at
>power on. I know everything points to the 5101 U8 chip being the reason it
>won't get to the 3rd flash. So, I installed a new chip and traced all pins
>on that U8 chip and they all check out OK. This rules out the socket. Also
>double checked the socket on U7 and they all trace/check out ok. I mean I
>can put in a new socket but if they all trace to the next destination, is
>that necessary??
>
>What is the next thing to look at here? I can't find any more info after
>googling or looking at Clay's site. Any help as to what to look for would
>be appreciated.
>
>Thanks!!!
>
>Dave Martin
>
>
>
>
OK, I took the time to put in a new socket for U8 this evening. Still
no difference!! Anyone else got any ideas as to what to look for next??

Thanks!

Dave

Archived from groups: rec.games.pinball (More info?)

Try measuring the voltage to the 5101's. -- Pin 22.

-- Ed



"Dave Martin" <pinballs@ptd.net> wrote in message
news:Bw6dnQ8-_JvOTb3eUSdV9g@ptd.net...
> Dave Martin wrote:
>
>>OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a
>>Galaxy) has NO acid damage and there is no battery. I've installed brand
>>new roms and jumpered accordingly. The LED flashes 2 times and I get 2
>>"dings" at power on. I know everything points to the 5101 U8 chip being
>>the reason it won't get to the 3rd flash. So, I installed a new chip and
>>traced all pins on that U8 chip and they all check out OK. This rules out
>>the socket. Also double checked the socket on U7 and they all trace/check
>>out ok. I mean I can put in a new socket but if they all trace to the
>>next destination, is that necessary??
>>
>>What is the next thing to look at here? I can't find any more info after
>>googling or looking at Clay's site. Any help as to what to look for would
>>be appreciated.
>>
>>Thanks!!!
>>
>>Dave Martin
>>
>>
> OK, I took the time to put in a new socket for U8 this evening. Still no
> difference!! Anyone else got any ideas as to what to look for next??
>
> Thanks!
>
> Dave

Archived from groups: rec.games.pinball (More info?)

yes double check those traces acording to clay's site I just went thru this.
on 2 boards
1 stern mpu200
1 bally -35
on the clay's site it states the pin outs for the 5101 check it's relation
to the pia and the other chips some have 2 locations.
I missed one ripped off trace connection repaired that then bingo it worked.
Timathie

"Dave Martin" <pinballs@ptd.net> wrote in message
news:Bw6dnQ8-_JvOTb3eUSdV9g@ptd.net...
> Dave Martin wrote:
>
>>OK, this one is driving me kinda nuts. This MPU (Stern MPU 200 in a
>>Galaxy) has NO acid damage and there is no battery. I've installed brand
>>new roms and jumpered accordingly. The LED flashes 2 times and I get 2
>>"dings" at power on. I know everything points to the 5101 U8 chip being
>>the reason it won't get to the 3rd flash. So, I installed a new chip and
>>traced all pins on that U8 chip and they all check out OK. This rules out
>>the socket. Also double checked the socket on U7 and they all trace/check
>>out ok. I mean I can put in a new socket but if they all trace to the
>>next destination, is that necessary??
>>
>>What is the next thing to look at here? I can't find any more info after
>>googling or looking at Clay's site. Any help as to what to look for would
>>be appreciated.
>>
>>Thanks!!!
>>
>>Dave Martin
>>
>>
> OK, I took the time to put in a new socket for U8 this evening. Still no
> difference!! Anyone else got any ideas as to what to look for next??
>
> Thanks!
>
> Dave