(Topic ID: 234688)

Strange issues with a TZ (solved)

By BlackEuropa

5 years ago


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#2 5 years ago
Quoted from BlackEuropa:

Reinstalled and got a ton of problems. [...] Flash lamps behind the gumball, in the right corner and next to the slot entrance are now stuck on.

For these - the ribbon cable between the MPU and the 8-Driver board (small ribbon cable that plugs into the side of the MPU opposite te one that goes to the power board) is not on correctly. Remove and reseat, being very careful of where Pin 1 is.

#6 5 years ago
Quoted from ryanbrooks:

I believe Coyote and Going4 are right. What you’ve described is either ribbon cables or a prior owner/would be tech replaced some connectors and didn’t key them and things aren’t plugged in wrong. It’s embarrassing. We’ve all done it. I’ve worked on this stuff my whole life and I still make simple errors like this at times.

I hate to say it, but it literally just happened to me a week ago. On my TZ, even. I plugged them all in - double-checked everything and... STILL had an issue. Peer more closely - this time, I somehow reversed one end of a cable. *facepalm*

The flashers that are stuck on in BlackEuropa 's case are all controlled by the 8-driver board - the small, additional board in the backbox. It also reports the 9th switch column (the clock). If it's not plugged in properly, the transistors are powered, turning on all the flashers. It's possible that the ribbon cable is correct, but the 8-driver board's not getting power, or wrong power.

In either case, I'm follow - I'm curious to see what it does turn out to be.

#8 5 years ago
Quoted from BlackEuropa:

-NFL referee voice-
"Upon further review... Coyote was right on the first post. Replay first down".
Thanks Coyote and everyone for the replies.
Data cable to the 8 driver board was reversed on the left side of the mpu. I never did that before because the ribbons are all molded into a particular shape after 25 years. That ribbon appeared to be oriented the right way but it was 180 degrees out.
There had been a paper holder that suspended that ribbon. It ended up in the bottom of the cabinet and let the ribbon fall down. It changed the orientation. Lesson learned... Follow the red stripes. Pin 1 to pin 1.
I have to say these electronics are pretty tough! After the torture I subjected mine to, the damage is minor. I just played a game. The clock even works now! If nothing else, my post documents the specific symptoms of reversing that cable.
I still have a few optos out. It won't let me load the gumball, and the gumball entry is dead among others. Do you think I fried the 10 opto?

Ah, good to hear!
So the only things out now are the opto switches?
No, the opto board has no wires in common with the 8-driver board, so something else is up.

GO into switch test, and see which optos are reporting blocked.

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