From Newsgroup: rec.games.pinball

I am working on an Atari Superman and found some curious problems. The game boots up and plays fine.

1. Displays flicker and are very dim. Most of the time it's hard to tell
what the score is.

2. The MPU 9VDC test point shows 6VDC. Some of the other voltages are a little low (by less than 10%) so I didn't worry about them. Not sure what
the 9VDC circuit does. On the schematic it seems to do nothing. I've got
to be missing something here.

3. The speaker has a rather loud annoying hum all the time.

4. The owner said they were told that the capacitors were weak and that
they should turn on the game and wait for 5 minutes or so for it to warm up before playing. I didn't see this problem.

In looking at various documentation I couldn't find anything about the above
4 items. Any ideas?

Daina
--
Daina Pettit=daina@xmission.com, voice: (801)277-6296, msg: (801)277-0888
Linux Consulting Salt Lake City, Utah http://www.MrPinball.com
Mr. Pinball Classified--More Pinball Ads than ANYWHERE, and they're FREE!
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From Newsgroup: rec.games.pinball

On Monday, January 11, 2021 at 7:19:17 AM UTC-8, Daina Pettit wrote:

I am working on an Atari Superman and found some curious problems. The game boots up and plays fine.

1. Displays flicker and are very dim. Most of the time it's hard to tell what the score is.

2. The MPU 9VDC test point shows 6VDC. Some of the other voltages are a little low (by less than 10%) so I didn't worry about them. Not sure what the 9VDC circuit does. On the schematic it seems to do nothing. I've got
to be missing something here.

3. The speaker has a rather loud annoying hum all the time.

4. The owner said they were told that the capacitors were weak and that
they should turn on the game and wait for 5 minutes or so for it to warm up before playing. I didn't see this problem.

In looking at various documentation I couldn't find anything about the above 4 items. Any ideas?

Daina
--
Daina Pettit=da...@xmission.com, voice: (801)277-6296, msg: (801)277-0888 Linux Consulting Salt Lake City, Utah http://www.MrPinball.com
Mr. Pinball Classified--More Pinball Ads than ANYWHERE, and they're FREE!

Sounds like bad filter capacitors if you've got hum.
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From Newsgroup: rec.games.pinball

On 2021/01/11 7:19 a.m., Daina Pettit wrote:

I am working on an Atari Superman and found some curious problems. The game boots up and plays fine.

1. Displays flicker and are very dim. Most of the time it's hard to tell what the score is.

2. The MPU 9VDC test point shows 6VDC. Some of the other voltages are a little low (by less than 10%) so I didn't worry about them. Not sure what the 9VDC circuit does. On the schematic it seems to do nothing. I've got
to be missing something here.

3. The speaker has a rather loud annoying hum all the time.

4. The owner said they were told that the capacitors were weak and that
they should turn on the game and wait for 5 minutes or so for it to warm up before playing. I didn't see this problem.

In looking at various documentation I couldn't find anything about the above 4 items. Any ideas?

Daina

Hi Daina,

I have some Atari notes here:

https://www.flippers.com/atari_pin_service.html

Sounds to me like the last problem shown on the page - bad connections
at the bridge rectifiers...and it won't hurt to touch up the solder connections on the regulator PCB.

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
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From Newsgroup: rec.games.pinball

On 1/11/2021 10:19 AM, Daina Pettit wrote:

I am working on an Atari Superman and found some curious problems. The game boots up and plays fine.

1. Displays flicker and are very dim. Most of the time it's hard to tell what the score is.

2. The MPU 9VDC test point shows 6VDC. Some of the other voltages are a little low (by less than 10%) so I didn't worry about them. Not sure what the 9VDC circuit does. On the schematic it seems to do nothing. I've got
to be missing something here.

3. The speaker has a rather loud annoying hum all the time.

4. The owner said they were told that the capacitors were weak and that
they should turn on the game and wait for 5 minutes or so for it to warm up before playing. I didn't see this problem.

In looking at various documentation I couldn't find anything about the above 4 items. Any ideas?

Daina

The Superman I just finished up not too long had the wait 5 minutes for
it to boot up. I replaced all the electrolytic caps since they are what
42 years old, big ones included (the 6800uf @ 75v is expensive $32).

Once I replaced them, those issues went away. Ended up sending the
boards to John Robertson to get my sound issues fixed. So the info John posted, you should definitely check out.

And now I have another one to fix! Just ordered all the caps again :/

Paul
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