(Topic ID: 162430)

Jacks to Open start and credits not working


By UofG2000

3 years ago



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  • 24 posts
  • 7 Pinsiders participating
  • Latest reply 2 years ago by UofG2000
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#1 3 years ago

Hello,
My first solid state after a few EM's, so a lot of learning to do. A system 80A Jacks to Open. Machine lights up when on switch is pressed. Shows 0 credits. All scores do light although right side scores are very dim but do show 0. Credits are set to 1 quarter is 1 credit. Dropping in a credit either passes through to coin box or is rejected but either way no credit is registered. Manually trying to add credits doesn't do anything either. Start doesn't work as a result of no credits. Self test button doesn't seem to work to get into bookkeeping. Sound test on SB1-1 works and I get sound. No obvious damage from battery to the boards, it has been removed. Original owner had removed the battery several years ago when machine stopped working. Fuses look good.

Any advice for a new solid state owner?

Thanks,

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#2 3 years ago

Seems like maybe you lost the ground wire for he coin door?

#3 3 years ago

Check the coin door molex connection in general, does sounds like a loose connection if not a major board issue. Are the displays cycling to the high score (0000000) and back correctly?

#4 3 years ago

Hi

Thanks for the replies. Coin door looks to have ground connected, seen in images. Molex connector I reseated but no difference. When the machine is powered on it simply shows a single 0 in each of the 4 score displays and credit display. Here is short video, not overly exciting.

Thanks,
Chris

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#5 3 years ago

Hi,

I am thinking this machine does not power on correctly, since it instantly displays 0 in scores displays without any delay. Watching video of other Jacks to open, there is a delay before it powers on the displays. It is not cycling the displays to the high scores 0000000 and back on boot as it should.
Any other ideas, work through the pinwiki for system 80a I guess. I am ordering a replacement 15000 uf 25v capacitor to get rid of the 2 large orange 6800uf 25v in the bottom of this unit.

In the attached image, is this battery damage. This is where the battery was that was removed several years ago by the original owner.
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Chris

#6 3 years ago

Check that the coin switches are not stuck, easy check.

#7 3 years ago

Are the scoring digits being displayed strobing? If so, check the slam switches, especially the one on the coin door. Make sure it's closed.

#8 3 years ago

Hi

The coin switches dont seem stuck. I did pull the coin mech out to examine the switches and they are clean and in the correct position. There is no power to them it seems.

The scores don't display strobing zeros they just instantly turn on to 0. The slam switch is closed on the door. The switch is open on the tilt in the left of the cabinet which should be right according to the schematic.

Chris

#9 3 years ago

I would clean that area on the board where the battery was 225f8c227bfb89d12aed6159fd6c2df3278292df[1]_(resized).jpg
Does the board have this mod and have the ground mods to all the boards in the back box been done.

#10 3 years ago

Put some pictures of your boards up

#11 3 years ago

Try unplugging the Reset board that is mounted directly above the MPU board. I picked up a SYS80 years ago that didn't boot because the board was faulty. Unplugged it and all was good! Worth a try anyway...

#12 3 years ago

Hi,

I will clean up the battery area. No mods have been done to game yet. It looks like you are pointing to the slam switch mod in your example. I did use alligator clips for a quick attempt at the slam switch mod briefly (perhaps that is not a good way to do that), but didn't make any difference. I would need to do ground mod still and the orange filtering capacitors are on order, but they will be a couple weeks from the US to Canada. I tried to source the 12000 or 15000uf 25v capacitors locally from electrical suppliers and they all looked at me like I was crazy. "You want what now? 12,000? you serious?".

I have pulled all the connections several times and reseated them hoping that would help. Woz, did you unplug the reset board and then leave it unplugged and it booted?

Here are the photos, sorry about the flash. CR7 got real hot of course in the past.

thanks again,
Chris

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#13 3 years ago

Yes I unplugged it and it worked IIRC the Reset board detects that the digits are strobing which indicates that the MPU hasn't locked up. If it detects a lock up then it resets the MPU.

Here's a home made reset board that was installed in my Black Hole when I picked it up years ago

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#15 3 years ago

Home made you say? Woah. I unplugged the reset board but it didn't help.

Here are better board shots.

Chris

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#17 3 years ago

Every 80a Power board i have seen and including my power board CR7 look like yours , if the any of those 4 wires going to
A24-P2 are not making a good connection that will cause problems ,with the machine power on gently wriggle the wires on A24-P2

#18 3 years ago

That pinwiki article about displaying single 0 or 1 I had read but it seemed vague. Basically says the 3 chips are screwed? Or what does IC stand for? Integrated circuits z7, z8 and cpu are bad?

Yes cr7 burns hot which I guess should be corrected although I was hoping to leave it for now.

I will try the wiggle Raff. Wiggle didn't help. Too bad, I like the idea.

Also check out Z7 in this photo of my board, that part on the IC doesn't match the original part number. Perhaps it was changed once already?

Thanks,

Chris

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#19 3 years ago

I ordered new Z7 and Z8 chips from digikey.ca . Having a hard time finding a new CPU, any idea where to get one? I am taking a guess that this is the issue due to the single 0 showing in the display from pinkwiki article, and the fact that z7 looks to have been replaced before. How hard is it to remove and replace these? I thought you had to desoder the points from the board or hope for a socket holder. Is this youtube video accurate, looks like he is using a heat gun. That can't be right?

Chris

#20 3 years ago

Is there a way to test the integrated chips, using voltage out as a indicator of whether it is working correctly?

Thanks

#21 3 years ago

Hi,

Hope to check into many of these items this long weekend, if anyone has other comments.

Thanks

#22 3 years ago

On the Z9 IC, it looks like the legs are darker than all other IC's.

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#23 3 years ago

Hi,
I replaced the two 6700 uf electrolyte capacitors today with one 15,000 uf capacitor.

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2 months later
#24 2 years ago

Where to start with this machine. Many many thanks to Chris Hibler for the extensive board repairs. Ram u4, CPU, z26 all socketed and replaced. Socketed and replaced z12, z13, z15, slam switch mod, ground mods to all boards and harness. Power supply updated with all recommended fixes, cr7, r10, 5v trim pot and more. Power led on MPU was a super nice touch. Can't say enough about Chris.

Then I was able to correct scoring issues with all 3 pop bumpers, 2 broken rollovers and lighting issues.

That was a learning experience.

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