The goal for my weekend is to try to get an EBD LE working. I picked this up a while ago from a guy retiring and moving to Florida and am just now really working on it.

History since I've had it: When I got it home it was working mostly correctly, but in the process of fixing things under the playfield it has started failing. One of the first problems was that the sounds were off from what was happening in the game. I had a different thread on that. I recapped the squawk and talk board, but I don't think that was the issue, but since I had the parts, I figured I'd go ahead and do it. I think it was a wiring issue, and might still be the root cause. I also put new pins on the expanded light board for one connector and replaced the IDC connector with a new one with the turficon (sp?) connectors.

This game has an Alltek universal solenoid driver board in it. It also has a Rottendog rectifier board as well.

Currently, the game will boot up, and I can start a game with the start button, but only the left flippers will work. The EOS switches for the left flippers have a huge arc when activated. If I push the pop bumper skirts the Alltek board will light some red LED's for different solenoids. I think that indicates a short? I took voltage readings on the Alltek board, and noticed that the 12 volt feed is coming in at 17 volts.

Also, once the game has booted, if I pull up on the two large sets of wires running from the playfield up to the the boards, the game will reset. This is why I think I have a wiring problem.

All fuses on the rectifier board are good (it has blown a fuse in there before) and all fuses under the playfield test good (a couple of them have also blown after fixing switches, etc). I did find one strand of one of the wires going to the right flipper solenoid that was touching the adjacent lug on the solenoid.

The rotating LED's on the Alltek board are good, with the #19 LED being lit green.

So, should I tackle the 12 volt issue first?

Thanks for the post Xenon75, I'll start with redoing those connectors and report back. I feel a hand cramp may be in my future....

Turns out I don't have the right size for the smaller connectors, so I'll be placing another order with GPE. Can I reuse the plastic Molex connector housings going to the rectifiler board, and should I plan on replacing the connectors going between the playfield and the backbox pictured?

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Thanks Cody, so basically just replace the connectors in the backbox if they haven't been already. I haven't had a pin this old so I thought maybe those go south too.

I really appreciate the tips guys. Just got done polishing all the pin legs and reflowing connections on the MPU.

I found one bad MCR106-1 on one of the light boards. Besides those and some 2N5060's, can you recommend any other transistors that you commonly run into from pins from this era? Most of the ones I have on hand are for newer pins.

Reviving old thread. Finally got around to replacing all of the connectors on the CPU board, and the pin still won't boot. Looking for help on where to look next. Thanks!

I didn't replace the pins on the board, but replaced the IDC wiring connectors with the crimp on connectors. This weekend I'm going to revisit Clay's guide that covers the Bally pins of this era.

Diagnostic LED on the MPU board is solid, no flashes. For clarification purposes, does it matter if my 12 volt supply is providing 17 volts?

Since originally getting the game I have fixed some bad connections under the playfield and replaced one bad transistor on the lighting board, and replaced the caps on the Squawk and Talk board. I replaced the IDC connectors with pin on connectors for the MPU board, and reflowed the solder on the header pins on the MPU board.

TP5 is showing 5.01 volts, and TP2 is 17.35 volts. I did notice that when I first turned the game on the LED was off and I had nothing at TP2. Turned it off and back on and had 17.35 volts.

Here are some shots of the MPU board.

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Thanks for the help Quench. I'll take a look tonight when I get home from work on U6. I forgot that I did pull the chips on the board and cleaned the pins so it is very possible that I put it in backwards and put U2 in the wrong socket. Are those RAM chips hard to obtain now or readily available?

Quench is da man!

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U6 was correctly installed. Moved U2 to it's correct socket and installed the connector at J3 correctly and the game booted up. If you're in the Chicago area let me know and drinks are on me! I've got a couple of lights still out but this is most encouraging! Thanks again!

The game boots, but it's back to calling out the wrong setting when I turn it on and it won't take credits. When I power it on now it says "5 ball" and then when it finishes booting "eight ball deluxe...4 ball". It was playing 3 ball when it was booting correctly. It plays the sound for credits but it doesn't add them.

I thought that was the match for the last game. Maybe I should have put the lower glass back on. So it's taking credits, but the start button isn't starting a game.

They are both set to off. The game says "5 ball" while it is booting (around flash 3-4 of the MPU LED sequence). Then after it boots it calls out "eight ball deluxe....4 ball"

Switch test showed #31, left slingshot. Found a bent switch lug that was touching the other lug. Bent it over, now switch test is flashing 0. Rebooted, same behavior, calling out 5 ball during boot process, after boot, "EBD.....4 ball". I did have to power cycle the game to get it to boot correctly after the test.

It won't start a game. The start button is not registering. I guess I could test that with the switch test......actually, the start button is probably not on the switch matrix.....

Credit button, along with all other switches are working in the switch test. Sounds like it may be time for this MPU to get some work done.

Tried flexing the MPU while pushing the credit button, nothing. Quench, the game still has the 40 credits. Credit button does nothing in attract mode.

Earlier the game called out "Shoot the five ball" instead of "Eight ball deluxe - 4 ball", but a couple of boots later it went back to the "EBD 4 ball". Just mentioning it.

Are the flipper switches supposed to register in the switch test?

No, this was done without a ball in the game. I'll check that tonight when I get home.

Quench, I'll perform your steps as well, I really appreciate the suggestions guys.

The plot thickens. I reset the credits in the audit mode, or at least I thought I did. Turned the game back on, it still showed 40 credits. Wouldn't start a game.

Went back into test mode, and noticed that the pin would reset during the solenoid test when it was firing the bank that knocks down the drop targets on the right for the ball targets. Raised the playfield, pulled the bank of solenoids off the housing and didn't see anything obviously wrong with the wiring, so I reinstalled them.

With the playfield raised, turned the pin on, and didn't get the "5 ball" callout and got a normal boot, complete with the sound effects that I had forgotten about when the game boots and all the lights flash. Now it shows 19 credits, but it still won't start a game. Put the playfield down, and got the screwy boot with the "5 ball" callout during the boot process and back to "Eight ball deluxe....4 ball" without the sound effects.

I unplugged the the wiring running to the right drop target assembly, and now the game boots normally, playfield raised, lowered, whatever, so I must have a wiring issue with the wiring running through those connectors. I noticed I can't do any tests with that bundle disconnected so without looking at the manual I'm guessing some of those wires run to the coin door.

Busy weekend but I did have some time to do some troubleshooting.

Turned out I pulled off the lower right connector from the MPU board when I was messing with the playfield which caused the test button not to work.

Since the solenoid bank that drops the right drop targets kept making the game reset during the solenoid test, I pulled the bank of solenoids out and looked over all the wiring once again. When you run the solenoid test out of the housing the bank fires without any issues. Put it back in the game, and the game would reboot during the solenoid test when it gets to the bank. I resoldered a few connections that looked suspect, but it didn't seem to matter. It seemed like it was the position of the wires once the solenoid bank was in place more than anything, but I didn't see anything looking like a short. To a make a short story long, after messing with the bank it started working in the solenoid test while mounted without the pin rebooting.

Oh, no LED's in this game and the relay clicks fine when testing, BTW.

The switch test will now show that the A rollover switch is closed if I raise and lower the playfield during the test. It looks fine. Ugh.

Quench, what setting in the audits is for credits? I'm not seeing any number that matches the credits displayed when I cycle through the audits. I couldn't find it in the manual.

Since the lower right connector kept coming off the MPU board and those header pins were the only ones that were original I decided to replace them. Two pads lifted while removing the pins, so at this point I may just send the board off to have it looked at and have a pro fix the pads and put in new pins.

Okay, reviving this old thread. I took the CPU board over to test it in a working EBD because I thought the credit button was working in test mode. The CPU board worked fine. After putting the board back in and running a switch test I noticed that it's not switch 6, the credit button that comes up when I push the credit button, but switch 5, inline back target. I checked the diode at the switch and it tests good.

I've been looking over the wiring schematics and I haven't found the credit button switch yet. If anyone has next steps on troubleshooting this please let me know.

Edit: found the credit switch, but I don't see how this could tie in to the rear inline switch.

Yes, all connectors have been redone for the MPU board. I tried to pull one wire at a time and crimp on the end and place it in the new connector, but it's very possible I screwed up.

I'm not the greatest at reading schematics. Looking at the above drawing, pin 12 should go to the in-line back target. Is it pin 2 that should be going to the credit switch? I'll take a picture of my wiring when I get home tonight and paste it.

Thanks for the help!