New! Dark mode!

Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!

(Topic ID: 273726)

Bobby Orr Power Play MPU Missing ROM Chip


By Geeter83

3 months ago



Topic Stats

  • 11 posts
  • 4 Pinsiders participating
  • Latest reply 3 months ago by zacaj
  • Topic is favorited by 1 Pinsider

You

Linked Games

Topic Gallery

One image has been uploaded to this topic. (View topic image gallery).

20200723_200405 (resized).jpg

#1 3 months ago

Hello - I recently noticed my BOPP was seemingly missing a ROM Chip from the MPU (see attached picture). I ordered a new MPU board, along with SDB and Lamp Driver board mainly due to free time availability, however I'm curious if someone could help me with what that ROM Chip controlled? I have the schematic, but no matter how much I enlarge it, I can't read the writing on the version I have for the MPU Control Board. (The chip missing is U1)

Subsequent question, is the U1 displayed on the MPU schematic the same as the blown up version for the Lamp Driver Schematic? If so, then it would appear U1 is controlling roughly 16 different lights, all of which would be out on my playfield.

Also, notice the jumper wire on U2 that connects to R14. This doesn't appear on the schematic, any idea what this is for?

Thanks so much!

20200723_200405 (resized).jpg
#2 3 months ago

That chip isn't necessarily required. These boards can be adapted to use between 1 and 4 rom chips.

You would have to check what type of rom you have in u2 and u6, and see what your board is jumpered for, to determine if U1 is actually missing.

I'd assume the wire is part of some custom jumpering to use a specific type of rom

If the board gets at least one flash on power on, that means the roms have all checked out.

The U# on different boards have no relation

#3 3 months ago

Power Play and all the games using the -17 MPU do not use a U1 ROM.

The wiring hacks around U2 are so an EPROM can be used in place of the original masked PROM.

#4 3 months ago

Thanks all! Not going to lie, most of those posts are above my head, but I'm feeling better about my new MPU board purchase as it sounds like I'd have to reverse engineer some of the mods made to the machine over the past 50 years.

#5 3 months ago
Quoted from Geeter83:

Thanks all! Not going to lie, most of those posts are above my head, but I'm feeling better about my new MPU board purchase as it sounds like I'd have to reverse engineer some of the mods made to the machine over the past 50 years.

can't see the back of it but besides the erpom hack that mpu looks pretty clean compared to most. could probably cut the battery off and toss it up on ebay as is and make up some of the new MPU cost back. someone who likes to repair boards would buy that.

#6 3 months ago

You'll get better replies on one of the Solid State forums. This is Electro Mechanical.
https://pinside.com/pinball/forum/topic/how-to-efficiently-ask-for-pinball-repair-help-em

#7 3 months ago
Quoted from barakandl:

can't see the back of it but besides the erpom hack that mpu looks pretty clean compared to most. could probably cut the battery off and toss it up on ebay as is and make up some of the new MPU cost back. someone who likes to repair boards would buy that.

I cut the battery off last night. Battery removal on these older MPU boards shows up as the very first step on almost all posts, figured I would follow suit. Correct, overall, the board is in really good condition, no leakage or corrosion anywhere. Thanks for the tip about eBay!

#8 3 months ago
Quoted from HowardR:

You'll get better replies on one of the Solid State forums. This is Electro Mechanical.
https://pinside.com/pinball/forum/topic/how-to-efficiently-ask-for-pinball-repair-help-em

Apologies, this specific topic belongs in SS. I have always struggled with where to tag BOPP as it is both SS and EM.

#9 3 months ago
Quoted from Geeter83:

Apologies, this specific topic belongs in SS. I have always struggled with where to tag BOPP as it is both SS and EM.

BOPP isn't EM. Some earlier games like Mata-Hari had EM and SS versions, but even then a specific game is either an EM or an SS.

#10 3 months ago
Quoted from zacaj:

BOPP isn't EM. Some earlier games like Mata-Hari had EM and SS versions, but even then a specific game is either an EM or an SS.

Thanks for clearing that up for me! How does one move or change the tags on my post? Sorry, I'm relatively new to Pinside and am gathering so much information from this community! Am blown away with the responsiveness and helpfulness of others. Thank you so much

#11 3 months ago
Quoted from Geeter83:

Thanks for clearing that up for me! How does one move or change the tags on my post? Sorry, I'm relatively new to Pinside and am gathering so much information from this community! Am blown away with the responsiveness and helpfulness of others. Thank you so much

I think only a moderator can sadly

Promoted items from the Pinside Marketplace
$ 149.00
$ 119.95
Boards
Allteksystems
From: $ 25.00
Boards
nvram.weebly.com
From: $ 155.00
$ 49.99
Electronics
PinballElectronics.com
From: $ 140.00
$ 9.00
Cabinet Parts
Third Coast Pinball
$ 149.95
Boards
Allteksystems
From: $ 45.00
Displays
PinballSolutions.eu
Wanted
Machine - Wanted
Los Angeles, CA
$ 8.00
Electronics
Third Coast Pinball
$ 159.00
From: $ 18.00
Apparel - Men
Pinside Shop
From: $ 14.00
Electronics
Third Coast Pinball
$ 24.25
Playfield - Toys/Add-ons
The MOD Couple
$ 45.00
Playfield - Toys/Add-ons
Docquest Pinball Mods

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside