Tech- bally mpu interchangeability

[Paul]

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

i am working on an evel kneivel. the original board is ruined with
battery corrosion. i do have a bally -133 board from a big bat (pitch
and bat) game. i replaced the eproms and re jumpered the -133 board
and it boots up fine. when the board finishes booting it should play a
tune with the chimes in the cabinet. what it does is plays the tune
with the playfield solenoids instead of the chime solenoids. i am
wondering if i should give the wiring a good look or if the -133 board
is not a suitable replacement for the -35.
thanks for any insight
Paul

 

[Guest]

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

When I first got my Bally Power Play, it did the same thing, played the
chimes with other solenoids. After much looking, testing, and
research, it turned out that one pin of the PIA socket (can't remember
which and I don't have a schematic w/ me) on the MPU board was bad, and
it was one of the 4 signals that tell the solenoid driver which
solenoid to fire. These four signals are basically a binary number
from 0000 to 1111 which get decoded into one of 15 outputs (i.e., one
of 15 solenoids) on the solenoid board. With the missing signal, the
binary number was wrong, more times than not, since this signal was
always zero, so the improper solenoid would fire. That being said, you
can try reseating the two PIA ICs on the MPU, or try swapping them to
see if the solenoids behave, but then if it is the PIA that's bad,
something else will misbehave instead.

As far as a -133 being compatible w/ a -17 or -35, I'm sure someone
else will know more about that then me, but I seem to remember there's
a diode on the -133 that replaced a resistor on the -17/-35, and if you
don't put the diode back, it's not compatible - I'll bet Ray Johnson
knows for sure!

Let the adventure begin!!!

steve


---
Steve Kulpa (cargpb10 - sigh)
Hermitage, TN
http://www.geocities.com/stevekulpa/rgpidx.htm

 

[Guest]

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

There are any number of things that could cause that, but I would start
by checking the left side connectors and header pins on the MPU. A
cracked solder joint or broken trace can cause this. Also check the
PIA chip sockets.


paul wrote:
> i am working on an evel kneivel. the original board is ruined with
> battery corrosion. i do have a bally -133 board from a big bat (pitch
> and bat) game. i replaced the eproms and re jumpered the -133 board
> and it boots up fine. when the board finishes booting it should play a
> tune with the chimes in the cabinet. what it does is plays the tune
> with the playfield solenoids instead of the chime solenoids. i am
> wondering if i should give the wiring a good look or if the -133 board
> is not a suitable replacement for the -35.
> thanks for any insight
> Paul

 

[Guest]

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

There is a whole section of Bally -133 MPU boards and how to
make them compatible with -35 boards at
http://marvin3m.com/bally/index2.htm

paul wrote:
> i am working on an evel kneivel. the original board is ruined with
> battery corrosion. i do have a bally -133 board from a big bat (pitch
> and bat) game. i replaced the eproms and re jumpered the -133 board
> and it boots up fine. when the board finishes booting it should play a
> tune with the chimes in the cabinet. what it does is plays the tune
> with the playfield solenoids instead of the chime solenoids. i am
> wondering if i should give the wiring a good look or if the -133 board
> is not a suitable replacement for the -35.
> thanks for any insight
> Paul

 

[Guest]

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

Correct. Just to the right of the lower left connector on the -133, there is
a horizontally placed diode that should be replaced with a 2kohm resistor,
to complete the resistor divider network for the zero crossing circuit.

Chris

"Steve Kulpa" <stevekulpa@yahoo.com> wrote in message
news:1126284056.210203.220060@g43g2000cwa.googlegroups.com...
> When I first got my Bally Power Play, it did the same thing, played the
> chimes with other solenoids. After much looking, testing, and
> research, it turned out that one pin of the PIA socket (can't remember
> which and I don't have a schematic w/ me) on the MPU board was bad, and
> it was one of the 4 signals that tell the solenoid driver which
> solenoid to fire. These four signals are basically a binary number
> from 0000 to 1111 which get decoded into one of 15 outputs (i.e., one
> of 15 solenoids) on the solenoid board. With the missing signal, the
> binary number was wrong, more times than not, since this signal was
> always zero, so the improper solenoid would fire. That being said, you
> can try reseating the two PIA ICs on the MPU, or try swapping them to
> see if the solenoids behave, but then if it is the PIA that's bad,
> something else will misbehave instead.
>
> As far as a -133 being compatible w/ a -17 or -35, I'm sure someone
> else will know more about that then me, but I seem to remember there's
> a diode on the -133 that replaced a resistor on the -17/-35, and if you
> don't put the diode back, it's not compatible - I'll bet Ray Johnson
> knows for sure!
>
> Let the adventure begin!!!
>
> steve
>
>
> ---
> Steve Kulpa (cargpb10 - sigh)
> Hermitage, TN
> http://www.geocities.com/stevekulpa/rgpidx.htm
>

 

[Guest]

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

Paul As the others indicated; it could be a bad PIA socket (Solenoids are
controlled by U11 PIA).
It could also be a bad PIA. Remove U11 PIA and inspect socket with a
flashlight; if it looks okay
swap the chip from U11 into U10 and see if symptoms change; if so you may
have a bad PIA.
Also if PIA chip has blackened pins the pins may need cleaning.

Also with a light check the pins in the MPU J4 shell look good you may have
a bad connection.
Finally verify continuity of the solenoid control signals from MPU J4 to
Solenoid board J4.

MPU J4 usually gets bit by the battery corrostion so if the orignal board
got wrecked chances are
you have a bad pin(s) in the MPU J4 shell. I think this the most likely
problem based on what you said and
assuming you are replacing the corroded board with a "clean" board.

I'm assuming you've found the diode on the -133 that needs changing.
on the -17 and -35 boards it is R113. and in the same location.

For the moment I'm assuming your solenoid board is good; but I might be
wrong.

That should keep you busy for now.

Regards, Dallas...

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"paul" <phigby5150@yahoo.com> wrote in message
news:1126282852.890680.166760@g14g2000cwa.googlegroups.com...
> i am working on an evel kneivel. the original board is ruined with
> battery corrosion. i do have a bally -133 board from a big bat (pitch
> and bat) game. i replaced the eproms and re jumpered the -133 board
> and it boots up fine. when the board finishes booting it should play a
> tune with the chimes in the cabinet. what it does is plays the tune
> with the playfield solenoids instead of the chime solenoids. i am
> wondering if i should give the wiring a good look or if the -133 board
> is not a suitable replacement for the -35.
> thanks for any insight
> Paul
>