Bally Pinball 1977-85 Repair Part 3.pdf

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Repairing Bally Electronic Pinball Games

from 1977 to 1985, Part Three.

cfh@provide.net,

04/02/11.

Scope.

This document is a repair guide for Bally electronic pinball games made from 1977 to

1985. Since

Stern

electronic pinball games use nearly identical electronics, these games

are covered too.

Internet Availability of this Document.

Updates of this document are available for no cost at

http://pinrepair.com/fix.htm

if you

have Internet access.

This document is part three of three

(part one is

here,

and part

two is

here).

IMPORTANT: Before Starting!

IF YOU HAVE NO EXPERIENCE IN CIRCUIT BOARD REPAIR, YOU SHOULD NOT TRY

TO FIX YOUR OWN PINBALL GAME!

Before you start any pinball circuit board repair,

review the document at

http://pinrepair.com/begin,

which goes over the basics of circuit

board repair. Since these pinball repair documents have been available, repair facilities

are reporting a dramatic increase in the number of ruined ("hacked") circuit boards sent

in for repair.

Most repair facilities will NOT repair your circuit board after it has been

unsuccessfully repaired ("hacked").

If you aren't up to repairing pinball circuit boards yourself or need pinball parts or just

want to buy a restored game, I recommend seeing the

suggested parts & repair sources

web page.

Table of Contents

Getting Started:

Experience, Schematics, Manuals

Necessary Tools

Parts to have On-Hand

Game List

Lubrication Notes

The Circuit Boards

Voltage Test Points on the Boards

Fuse Values/Usage & Power Supply Power Distribution

Before Turning the Game On:

Check the Coil Resistance

Removing the MPU Battery and Fixing Corrosion

The Power Supply/Regulator Board - Blown Fuses, Bridges, etc.

Upgrading/Repairing the Voltage Regulator/Solenoid Driver Board

Upgrading the Ground on the MPU Board

Pre Power-On Voltage Checks

Connectors

Setting Free Play

When Things Don't Work:

Making a MPU test fixture

Fixing the MPU (LED flashes and the such)

Test EPROM & Fixing a Dead MPU board

Game ROMs, EPROMs, and Jumper - the Basics

-35 MPU Game ROMs, EPROMs, and Jumpers

-17 MPU Game ROMs, EPROMs, and Jumpers

Stern M-200 MPU Jumpers (using a Stern M-200 in a Bally Game)

Converting a -133 MPU (Baby Pacman) to a -35 MPU

The Built-In Diagnostics/Bookkeeping

Coils: Locked-on, Sporadic, or Not Working (Solenoid Driver board) including

Flipper Coils

Lamps: Locked-on or Not Working Feature Lamps (Lamp Driver board)

Solenoid Expander Board Problems

Auxiliary Lamp Driver Board Problems

Switches and the Switch Matrix

High Voltage Problems/Rebuild (No Score Display Power)

Score Display Fixes and Replacements

Reset or Lockup Power Problems

Sound Board Problems

Flipper Maintenance

Miscellaneous Problems and Fixes

3e. When things don't work: -35/-133 MPU Game ROMs,

EPROMs, and Jumpers.

Important: Before you Change any Jumpers!!

It is EXTREMELY important that you have a working MPU board

before

you change any

jumper locations! If the MPU board currently has ROMs in it, get it working first before playing

with the jumpers. If the MPU board is jumpered incorrectly for the game ROMs installed, the

diagnostic LED light will stay on, and the board will not power-up. So it is absolutely

important that the jumpers are correct for the ROMs installed. Get the MPU board working

first before proceeding.

Also of course, make sure the board being worked on is a AS-2518-35 (or AS-2518-133) MPU

(remember the -133 is really a -35 board with R113 changed to a diode CR52). The easiest

way to tell (besides looking at the silkscreened part number on the board!) is to examine

connector J5. On a -35/-133 MPU board, J5 will have 33 pins (including the removed "key"

pin).

Max out ROM Memory on the -35/-133 MPU to use 2732 EPROMs.

Jumpering is not a big problem until the MPU's ROM chips begin to fail, and MPU boards are

shifted from game to game. An MPU board can only be jumpered so many times before the

traces and jumpers start to lift and strip off the board. So instead of custom jumpering a

board to a particular set of ROMs, the best idea is to maximize the board to use the largest

EPROM size, and cater the EPROMs themselves to the board (instead of the other way

around).

This really makes sense as the largest EPROMs that will fit the -35/-133 MPU board are

2732's, which are commonly and cheaply available. For this reason, the Bally ROM code has

been re-formated to fit this size EPROM. The original program size and code is still available

from Williams at

www.pinball.com/Williams/tech/roms.html.

But I highly suggest you down

load the ZIP file

bly2732.zip

instead, as it contains all the Bally ROMs for all games from

Freedom (1977) to Cybernaut (1985), and has been converted to 2732 format. Only Baby

Pacman and Granny and the Gators ROMs are missing from this file. Using these files will allow

you to use a -35 MPU board for ANY Bally game from 1977 to 1985. Click

here

for a list of the

ROM files, and which games use which ROMs (note many games share the same U6 ROM).

Text file from Mr. Calahan.

One set of Jumpers for a -35 MPU using 2732 EPROMs.

For the -35/-133 MPU board, using all 2732 for ANY game has the advantage of just one set

of jumpers. Just download the above file and expand it, and burn your game into 2732

EPROMs. Then jumper your -35 MPU board like this:

1. Jump E4 to E13a

2. Jump E12 to GND (large GND trace next to the ROM sockets, left of E12)

3. Jump E7 to E8

4. Jump E10 to E11

5. Jump E31 to E32

6. Jump E16a to E29 (on -133 "E16 to E29")

7. Jump E33 to E35

Note: any jumpers still installed (from the old ROM setup) that are not listed above should be

removed.

Jumpers around the U1 socket, for using two 2732 EPROMs:

Jumpers E4 to E13a (top white wire), E12 to GND (right white wire),

E7 to E8 (middle left), and E10 to E11 (lower right).

Jumpers around the U6 socket, for using two 2732 EPROMs:

E31 to E32, E16a to E29, and E33 to E35.

If you don't want to convert your game to 2732 format, you can also use these jumpers for

other types of ROMs in your -35/-133 MPU board.

Using 2532 EPROMs instead of 9332 Masked ROMs.

If the game in question is a later Bally game with 9332 masked ROMs, these can be changed

to 2532 EPROMs with NO jumper modifications! This can be handy and convenient if the

original black 9332 masked ROMs need changing, but the repair person doesn't want to mess

with the jumpers.

The "Mother" Source for Jumper Info.

All the following jumper information came from several sources. The primary source is, of

course, the original MPU board schematics. There were also two secondary sources too. First

was Williams web site, located at

bally_read1st.txt

which contains all the jumper info you will

probably need. Also Joel Cook's "Pinball Lizard" Tech Tips Guide #1 has this information too. I

highly suggest the Joel Cook "lizard" tech books; they have lots of other good pinball repair

information too. You can buy these from Marco Specialties at

http://www.pinballmachine.com.

Bally -35 MPU Jumpers

ROM

9316

2716

2532

9332

2532

9332

9316

2716

2732

2532

9332

2732

9316

2716

9316

2716

9316

2532

9332

2716

2732

ROM

9316

ROM

MPU Board Jumpers in numberic order

Cuts

9316

1-4,2-6,7-8,9-11,12-36,13-15,16a-19,31-32,33-34

2716

1-5,2-4,7-8,10-12,16a-18,31-32,33-35

74S474 74S474 2716

1-3,2-6,9-11,12-36,13-15,16a-18,31-32,33-35

4-12, 7-8, 10-11, 13a-14, 16a-34, 29-33, 31-32

cut 13-15

4-12,7-8,10-11,13a-14,16a-29,31-32,33-35

2-6,7-8,9-11,12-36,13-15,16a-19,31-32,33-34

9316

1-4,2-6,7-8,9-11,12-36,13a-19,16a-18,31-32,33-35

cut 13-15

1-5,2-4,7-8,10-12,11-29,13a-14,16a-19,31-32,33-34 cut 13-15

1-5,2-4,7-8,10-12,11-29,13a-14,16a-18,31-32,33-35 cut 13-15

2716

1-5,2-4,7-8,10-12,11-25,13a-14,16a-18,31-32,33-35 cut 13-15

2716

1-5,2-4,7-8,10-12,11-25,13a-14,16a-19,31-32,33-34 cut 13-15

2716

1-5,2-4,7-8,10-12,11-25,13a-14,16a-34,29-33,31-32 cut 13-15

4-13a, 7-8, 10-11, 12-GND, 16a-18, 31-32, 33-35

4-13a, 7-8, 10-11, 12-GND, 16a-29, 31-32, 33-35

cut 13-15

Cuts

MPU Board Jumpers in numeric order

ROM

ROM ROM

The first three rows of this table are commonly found factory ROM jumpers.

Stuff to remember:

Bally uses a preceding "E" on all jumper numbers. Yes, the "E" has been left out above

to save some space in the chart.

The "dash" between the numbers is the "jump". That is, "1-4" means a jumper from E1

to E4.

Remove any jumpers not shown above for a given configuration. If it's not mentioned

above for your ROM set up, you don't need that jumper!

Don't trust other Bally jumper charts! The above chart is "the one to use" (using Bally

published jumper charts can lead to problems).

You must know the ROM device type installed at each ROM location. The Bally part

number (often printed on the ROM) does not help.

BLACK masked ROMs, as used in many Bally games, are entirely black and usually have

some white part numbers printed on them. These are known as 9316 masked ROMs.

EPROMs, on the other hand, have a small clear "window" on their top, often with a

sticker over the window. The sticker is there for a reason; it prevents UV light from

entering the EPROM's clear window (this is how an EPROM is erased! so keep the

sticker on the window). EPROMs are labeled as to their size (i.e. "2716").

The most common EPROMs used on Bally MPU boards are 2716, 2532 and 2732 EPROMs.

ROMs and EPROMs are game specific. Each game has its own custom set of ROM

computer code, stored on that game's ROMs (or EPROMs).

Some EPROM part numbers are interchangable. For example, 2532 EPROMs, 9332

masked ROMs, and 8332 masked ROMs all use the same jumper setting. But a U2 2532

EPROM from a Kiss game is NOT interchangable with a U2 9332 EPROM from a Strikes

and Spares! This also applies to the 16 bit masked ROMs too. That is, 9316 masked

ROMs, 8316 masked ROMs, and 8516 masked ROMs all use the same jumper settings.

But again a U2 9316 ROM from a Kiss game is NOT interchangable with a U2 8316 ROM

from a Strikes and Spares!

Freedom and Night Rider ROMs and Jumper Notes if using U1,U6.

These two games used a strange set of ROMs at U1 and U2. These are 74S474 or 7461 (512

byte) ROMs at U1 and U2, and a 9316 or 2716 (2K byte) at U6. The old Williams tech web

site at

www.pinball.com

states that a U1 2716 EPROM and a U6 2716 EPROM can be used for

these two games (and provides the ROM files for download, and the jumper settings for the -

35 MPU board).

Note I have also tested both games with 2732 EPROMs at U2 and U6 on a converted -17 and

-35 MPU boards (as documented above). This does in fact work fine for both Freedom and

Night Rider, and is a better solution in my opinion.

E13, E15 Mistaken Jumper Locations.

There are two jumper pads near the lower right hand corner of the U2 ROM socket labeled

"E13" and "E15". There are also two vias (plated through holes) just a little bit further to the

right, which are actually closer to the "E13" and "E15" labels. The vias are completely

unrelated to the labeled jumper pads. Be careful when using these jumpers that you don't

confuse the vias with the jumper pads. They are both round plated through holes, but the

jumper pads are a bit bigger.

3f. When things don't work: -17 MPU Game ROMs, EPROMs, and

Jumpers (and Stern M-100).

Important: Before you Change any Jumpers!!

It is EXTREMELY important that you have a working MPU board

before

you change any

jumper locations! If the MPU board currently has ROMs in it, get it working first before playing

with the jumpers. If the MPU board is jumpered incorrectly for the game ROMs installed, the

diagnostic LED light will stay on, and the board will not power-up. So it is absolutely

important that the jumpers are correct for the ROMs installed. Get the MPU board working

first before proceeding. If the ROMs are suspect as bad, and the MPU board is set up for

9316 ROMs (most -17 boards are), see the section below, "Making an Adapter to use Two

2716 EPROMs in an Unmodified -17 MPU board that is Jumpered for 9316 ROMs". This will

allow the use of two new 2716 EPROMs to replace the failed 9316 ROMs, without any MPU

board modifications or new jumper settings.

Also of course, make sure the board being worked on is a AS-2518-17 MPU. The easiest way

to tell (besides looking at the silkscreened part number on the board!) is to examine

connector J5. On a -17 MPU MPU board, this connector will have 32 pins (including the

removed "key" pin).

Bad MPU Board Sockets ("closed frame" sockets).

If a Bally MPU board is using brown or black closed frame sockets (closed frame means the

circuit board under the socket can not be seen), or sockets that have "SCANBE" or "RS"

impressed on them, it is advised they be changed! These older sockets are very troublesome

and cause many intermittent problems. A quick alternative to replacement is to plug a

machine pin socket into the brown socket. This is a *temporary* fix, but should work well

enough until the board is working, and then later replace the sockets).

A brown and a black closed frame socket.

There's no way around it, ALL these sockets will

need to be replaced on any Bally MPU board.

Because of this, it's highly recommended to

use a single 2732 EPROM at U2 when possible,

so the socket at U6 does not need to be changed.

Jumpers used on the Early -17 MPU (and Stern M-100).

The 1977 to 1979 Bally -17 MPU boards aren't as versatile as the newer -35 boards. They

have limited ROM space, which means they can't be used in the newer 1979 to 1985 games.

This can all be rectified, but will require some cutting and jumping of traces on the -17 MPU

board.

There are only a few jumper choices on the -17 MPU board. The following jumpers only apply

for the early 1977 to 1979 Bally -17 MPU board. Note the configuration that uses a U1 ROM

only existed for the first two Bally games, Freedom and Night Rider.

Bally -17 and Stern M-100 MPU Jumpers

ROM

MPU Board

Jumpers

in numeric order

Important Notes

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Bally Pinball 1977-85 Repair Part 3.pdf (2848 KB)
Williams Solid State Flipper Maintanence Dec 1979.pdf (3980 KB)
Williams Pinball Sys 3-7 Repair Part 1.pdf (2834 KB)
Bally Pinball 1977-85 Repair Part 1.pdf (2368 KB)

Bally Pinball 1977-85 Repair Part 3.pdf

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