Pinbot Freezing during multiball

Flippers work. But the mpu won't register score. And no sound effects except the music.

#4 10 years ago

BOY

vid1900

Pinside+ Member

Sana'a

12y 164K 40,185 18

What voltage are you getting on the CPU board?

Did you do ANY servicing before this started?

Did it ever work correctly?

#5 10 years ago

JOE

charliex

Pinside member

Vid, I won't be able to test the voltage until tomorrow. It used to work perfectly. the last repair I made was replacing a 7402 that was causing a stuck-on jet bumper. Prior to that repair there was no freezing. But I'm not so sure that it started freezing right after that repair. It is possible.

#6 10 years ago

TOX

ChrisHibler

OP
Quoted from charliex:
Vid, I won't be able to test the voltage until tomorrow. It used to work perfectly. the last repair I made was replacing a 7402 that was causing a stuck-on jet bumper. Prior to that repair there was no freezing. But I'm not so sure that it started freezing right after that repair. It is possible.

The 7402 can't be a factor.
I usually don't "go there", but this sounds more like ROM corruption, or access to the ROM has been corrupted/severed.
Reseat the game ROMs and retry.
If you have a burner, verify the checksum of the ROMs, or reburn new ones.

The rationale is that you've stated that this consistently happens during multiball, and only during multiball. i.e. under specific conditions where a different execution path is being followed.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#7 10 years ago

JOE

charliex

Pinside member

I will try reseating the ROMs. Additionally, I have the old original ROMs and I can try those as a sanity check. If the old ones work I can get new ones burned as you said.

I'll go that route. It might take me until the weekend to report back due to travel.

#8 10 years ago

NEO

CaptainNeo

Playfield restorations

Burlington, WI

11y 148K 22,432 37 77 1

if that doesn't work, use a space heater. Least it won't freeze anymore.

#9 10 years ago

JOE

charliex

Pinside member

Here's the update. I removed and reseated the game and sound ROMs. I tested for about 1/2 hour today and have not seen any freezing yet. I'll keep testing. Keeping my fingers crossed.

#10 10 years ago

BDD

ShootForSlrValue

Pinside member

Morgantown, WV

11y 47,650 412 24 29

Quoted from ChrisHibler:
The 7402 can't be a factor.
I usually don't "go there", but this sounds more like ROM corruption, or access to the ROM has been corrupted/severed.
Reseat the game ROMs and retry.
If you have a burner, verify the checksum of the ROMs, or reburn new ones.
The rationale is that you've stated that this consistently happens during multiball, and only during multiball. i.e. under specific conditions where a different execution path is being followed.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Just a question... What is the importance of verifying the checksum, what IS the checksum, and what does it mean to burn a rom??

#11 10 years ago

RJP

Patofnaud

Pinside member

Tilton, NH

11y 67,150 3,621 7

Quoted from ShootForSlrValue:
Just a question... What is the importance of verifying the checksum, what IS the checksum, and what does it mean to burn a rom??

Think of a rom are a big blank blackboard. The data in the rom is the stuff you write on the board. Now so you know that no one screwed white what you wrote on the board, you take every bit of information add it all up, apply some secret math and come up with a 'checksum' that if needed you can go back and verify in a few days that what you wrote adds up to what is there still.

So basically all your data is added up and a 'special' number is created and written at the end. Now when you boot the easiest way to see if what's in the roms is pure and correct, you read that last special number, then redo all the math to the data and compared to the special number. You check the sum.

#12 10 years ago

JOE

charliex

Pinside member

And burning the ROM just means writing the data to it. Like saving a file to a flashdrive. First you erase it with a UV light, then you save the new ROM file to the chip using a device called a "rom burner". They have USB devices that you drop the chip in and use a computer to write the file from your computer to the chip.

#13 10 years ago

TOX

ChrisHibler

Quoted from ShootForSlrValue:
Just a question... What is the importance of verifying the checksum, what IS the checksum, and what does it mean to burn a rom??

What Pat and Charlie said...
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#14 10 years ago

TOX

ChrisHibler

OP
Quoted from charliex:
Here's the update. I removed and reseated the game and sound ROMs. I tested for about 1/2 hour today and have not seen any freezing yet. I'll keep testing. Keeping my fingers crossed.

That's good...and bad...
It may work forever...or you may have an issue with one or more of the sockets.
Under these conditions, if it happens again, I'd replace the game ROM sockets.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#15 10 years ago

JOE

charliex

Pinside member

Quoted from ChrisHibler:
That's good...and bad...
It may work forever...or you may have an issue with one or more of the sockets.
Under these conditions, if it happens again, I'd replace the game ROM sockets.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

Roger that. I agree.. I'll need to have a pinbot fest first this week and make sure its really fixed for the moment. And dude.. You have a huge collection 60 games OMG I'm jealous.

#16 10 years ago

JOE

charliex

Pinside member

Final update. Its fixed. Reseating was the cure. Thanks again.

2 weeks later

#17 10 years ago

JOE

charliex

Pinside member

As a FINAL FINAL update. Reseating it did not fix it, but replacing the ROMS did fix it.

#18 10 years ago

TOX

ChrisHibler