Author Topic: Anyone repairing Tempest and / or Pole Position PCBs?  (Read 370 times)

Offline jpkiller69

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Anyone repairing Tempest and / or Pole Position PCBs?
« on: November 26, 2019, 04:28:12 PM »
Need someone to repair a Pole Position 2 and a Tempest.

Both are in "Mostly Working" condition.

Pole Position has a road/track graphic issue, then it crashes after about 5 minutes.

Tempest has horizontal line, but plays blind, hooked up to my analog o-scope and it's still just a horizontal line, so that rules out the monitor. Looks like one of the xy pots were replaced badly also.
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Offline Hamster

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #1 on: November 26, 2019, 09:46:51 PM »
tempest: sounds like bad Y dac ( vertical ) since you have full X deflection, that rules out the +/- power supply, but still could be op amp related, does the sound work and it act like its playing?
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Offline jpkiller69

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #2 on: November 27, 2019, 09:37:35 AM »
Yep, totally seems to be playing.  Sounds are all there, and can see some graphics movement in the compressed line.

I know I socketed and replaced a few of the more common chips in the x-y section, but can't remember exactly which ones.  Seems like I was being lazy and expecting an easy fix, then got distracted.


Also if anyone is interested, here is what the Pole Position is doing:

« Last Edit: November 27, 2019, 09:52:33 AM by jpkiller69 »
Pac-Man, Pole Position II CP, Ghosts&Goblins, Asteroids Cocktail, Asteroids Deluxe, Missile Command, Tempest, Battlezone, BurgerTime Cocktail, Alien Syndrome, Tailgunner 2 project

Offline windsoreight

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #3 on: December 01, 2019, 07:17:22 PM »
I repair Tempest pcb’s but have my hands full right now. Just got done with 4 sets of tron’s and now back on 5 sets of Star Wars.

Offline toastbot

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #4 on: December 06, 2019, 09:37:02 AM »
Re: Tempest: I had a similar problem that ended up being a bad fuse on the monitor board (chasis?). I would check all the fuses (not just the ones on the main PCB) and replace as needed.

If that doesn't fix the problem, get in touch with Atari Jim here on the board.
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Offline Hamster

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #5 on: December 06, 2019, 10:45:35 AM »
re: tempest.

I agree on Atari Jim Route.. I can look at, but would also need the complete machine, as could be Board or Monitor.  But i am not taking on any new work at this time.
http://www.coinopflorida.com // http://freeplayflorida.com

"Good engineers keep thick authoritative books on their shelf. Not for their own reference, but to throw at people who ask stupid questions. Hoping a small fragment of knowledge will osmotically transfer with each cranial impact."-eeguru


pins: TSPP, AMH, T3, ST:TNG, ST:LE, RCT, DW. DE:ST, DP , AbraCaDabra
vids: Q*bert, Mad Planets, Reactor, (2) Sega Uni, Linked OR2SP, APB, Crystal Castle, Taito Classics, Cloak and Dagger, MSPAC, Space Duel, Gravitar, Tempest, Omega Race, Tutankham, Warlords [custom]

Offline atarijim

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #6 on: December 07, 2019, 07:46:48 AM »
Put game in test, then turn on; verify being in test by cp buttons beep when pushed.
Measure X and Y output test points on board VDC, report results.

aj

Offline jpkiller69

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Re: Anyone repairing Tempest and / or Pole Position PCBs?
« Reply #7 on: December 30, 2019, 11:22:32 AM »
I ended up repairing it on Friday.

So story goes, when I brought it home I tested the output with the xy mode on an Oscilloscope.  Which showed the same vertical line as the display, so I knew it was the board.  I also tested the transistors on the monitor, and it all looked good.

I then desoldered and added sockets for the TL082s and then the DACs on the Tempest board.  After replacing those chips, and testing with the monitor, it still showed the same vertical line.

So since I was waiting on the last remaining chips to arrive on a slow boat from Taiwan, I replaced the pots in the analog section.

Once the MC1495's arrived, I replaced those and to my surprise, same vertical line.

So I'm sitting there behind the machine looking up at the monitor and I can see that the fuse F100 is blown, I start checking and F600 is also blown, I find one of the chassis mounted transistors was toast, and replace that and the fuses, and I'm greeted with a beautiful display.

Most likely when I replaced one of the chips the whole thing was working fine, and the monitor had died due to my testing, so moral of the story, I was being too lazy to test the monitor, thinking I had already found the one problem.

Silver lining to wasting so much time, and shotgunning parts, the game looks and plays awesome.

Pac-Man, Pole Position II CP, Ghosts&Goblins, Asteroids Cocktail, Asteroids Deluxe, Missile Command, Tempest, Battlezone, BurgerTime Cocktail, Alien Syndrome, Tailgunner 2 project