I picked up what appeared to be a nice Diamond Lady a couple days ago. The machine would not boot up. There was some previous battery leakage damage, as well as a very poorly hacked daughter-board hack, (the daughter-board is actually missing).

I installed a known working MPU/daughter-board. The machine booted up fine, displays/lamps all work. The only thing not working was the left drop target bank, which, I figured is probably caused by a bad transistor.

Anyways...

I had powered the machine off/on several times...everything seemed fine. I turned the machine off, and had wiped the playfield down, just doing some initial cleaning.

I go to power up the pin and it won't boot up. It's doing the exact same thing as it did when it had the original MPU installed. The backbox light is on, some of the PF GI is on, and a few of the inserts are cycling through the attract mode. No Display, no LED blinking on the sound board.

I figure whatever caused the original MPU board to not work has now done the same thing to my known good MPU board.

I'm not at all familiar w/ these Gottlieb pins.

Any ideas as to what to look for?

Any help would be GREATLY appreciated....This really looks like it will be a super fun pin to play, (I like drop targets).

I left the machine on for over 30 minutes...no hot chips.

I tried that...I still get the same results.

Where do I check that?

Update,

I'm not sure if this is the cause of my problems, but I just noticed that 2 terminal to my Aux power supply are broken.

Does anyone know of a source to get the Gottlieb style card connectors?

I need the 12 pin version.

Latest update...

I'm getting consistent 5 volt readings on all of the pins on the power supply board.

I found a few connectors w/ a few broken terminals.

I've replaced all of the terminals in those particular connectors...still no luck in getting the machine to put up.

Sometimes when I power up the pin, the LED on the sound board doesn't light at all. Sometimes it will continuously blink, (normal), then sometimes it comes on, and stays on, no blinking.

By the way, even when I had the machine up and running yesterday, there was NO sound....not sure if that has anything to do with my problems.

I'm going to replace all of the Molex connectors/terminals tomorrow.

I have a hunch I've blown something up on the MPU board.

I noticed that someone had attached ground wires to the driver board, MPU, and power supply board...attaching them to the upper left corner of the back box ground plane. They've also attached a wire from the ground plane to the ground braid on the back leg, (see picture).

They did NOT do the ground mod on the white wires that are attached to the transformer chassis. I'll be doing that this morning.

With the the ground mod on the transformer chassis, will I still need the ground wires that are attached to the individual boards/ground braid?

I also plan on installing an additional "pinch terminal" on the big black connector that goes from the MPU to the driver board that Gottlieb suggests doing in the long lost service bulletin.

Thanks again for the help guys...I'm determined to get this up and running again, (I hope).

It looks like it will be a fun game to play.

DSC_2152.jpg

Update...

Ground mod complete...still getting the same results.

I think this is just going to be one of those pins that you just throw your hands in the air...and walk away.

Maybe I'll better luck at some other time.

I'm still thinking, for some reason, I've blown a chip on the MPU.

I'll try to work on the sound...one of these days. I need to get the pin to boot up again first.

Boy...you said it, right there.

I haven't walked away from it yet...

update...

I re-installed the MPU board that came with the machine. I removed/repaired the hack that was in the 24 pin socket where the daughter board mounts to the MPU board. Repaired the shoddy work in the 40 pin MPU socket that connects to the power supply board. Though the board shows battery leakage damage...it works.

Apparently, I blew something on the "good" MPU board I had installed.

Even though the pin is working for now, something tells me it's just a matter of time before the same component(s) blow on this board.

Anyone have any idea as to what I might have blown up on the "good" MPU I had installed?

Thanks Steve,

So far, I've replaced almost all of the edge type connector terminals. I've also replaced all of the header pin terminals with trifurcons. As for the U2 and U3 sockets, I've installed new 24 pin sockets in both of those.

I have a hunch, what I thought was a good MPU board turned out to be not so good....LOL

All sounds/coils/lamps working now. I just have a couple switches that aren't registering.

Thanks everyone for the help....

I'm still wondering if the circuit boards need to have that additional ground wire attached, running to the back box ground plane, now that I've done the ground mod???

will do....