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Author Topic: Pole Position plays blind  (Read 28504 times)

gyruss

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Re: Pole Position plays blind
« Reply #30 on: March 07, 2012, 11:02:45 AM »
No problem Etienne!
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Etienne MacGyver

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Re: Pole Position plays blind
« Reply #31 on: March 08, 2012, 02:19:19 PM »
Quote from: gyruss on March 05, 2012, 08:47:52 PM
I wish but i cut my hand with a piece of broken glass a few hours ago, kinda difficult to type atm so more from me tomorrow....
and that was yesterday.. ;)

Any updates on this great machine ?
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gyruss

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Re: Pole Position plays blind
« Reply #32 on: March 09, 2012, 06:02:45 PM »
Update:

I think the black bars on the left and right side of the screen are supposed to be there, because when i put the monitor back i saw that the cardboard bezel is covering both area's. I can only get rid of the red lines when i turn red all the way down.  :(

But................ i turned the machine back on today and after 30 minutes i started to smell something burning!  :o :o

So there's definitely a big problem somewhere!!  >:( >:( >:(
« Last Edit: March 09, 2012, 06:04:25 PM by gyruss »
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level42

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Re: Pole Position plays blind
« Reply #33 on: March 09, 2012, 06:19:06 PM »
Did you see anything smoking ?

Prttey sure the bars shouldn't be there. The red lines: turn back the "screen"  pot a bit, it should be on the flyback....but you have other problems now....
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ataritoobin

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Re: Pole Position plays blind
« Reply #34 on: March 09, 2012, 06:28:12 PM »
Quote from: gyruss on March 09, 2012, 06:02:45 PM
*snip*
...I think the black bars on the left and right side of the screen are supposed to be there...
*snip*

That's how mine looks.
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gyruss

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Re: Pole Position plays blind
« Reply #35 on: March 09, 2012, 07:15:22 PM »
No, didn't see anything smoking just a nasty smell, i suspect it's the monitor.

Lol, i was feeling pretty lucky this week for having a working pp, guess that ended quick!  ;)
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ataritoobin

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Re: Pole Position plays blind
« Reply #36 on: March 09, 2012, 07:17:15 PM »
Quote from: gyruss on March 09, 2012, 07:15:22 PM
No, didn't see anything smoking just a nasty smell, i suspect it's the monitor.

Lol, i was feeling pretty lucky this week for having a working pp, guess that ended quick!  ;)


I too thought my monitor was having issues yesterday - turns out the neighbors had their fireplace going  :lol:  :oops:
« Last Edit: March 09, 2012, 07:18:51 PM by ataritoobin »
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level42

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Re: Pole Position plays blind
« Reply #37 on: March 09, 2012, 07:40:28 PM »
Quote from: gyruss on March 09, 2012, 07:15:22 PM
No, didn't see anything smoking just a nasty smell, i suspect it's the monitor.

Lol, i was feeling pretty lucky this week for having a working pp, guess that ended quick!  ;)

Only one way to find the cause....turn it on again....
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Etienne MacGyver

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Re: Pole Position plays blind
« Reply #38 on: March 09, 2012, 07:52:37 PM »
hmmm  30 minutes no reply from gyrus......  :-\
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gyruss

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Re: Pole Position plays blind
« Reply #39 on: March 09, 2012, 07:54:47 PM »
 ;D ;D ;D ill look into it this weekend...
« Last Edit: March 09, 2012, 07:57:03 PM by gyruss »
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Etienne MacGyver

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Re: Pole Position plays blind
« Reply #40 on: March 09, 2012, 07:56:32 PM »
Ah good you made it out in time  :D
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level42

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Re: Pole Position plays blind
« Reply #41 on: March 09, 2012, 07:59:37 PM »
We could bring sausages and chicken legs to cook... ;D
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bencao74

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Re: Pole Position plays blind
« Reply #42 on: June 20, 2012, 02:37:32 PM »
I'll just continue this thread with my repairs :-)

So I had two chassis with unknown defects :

- First one had a clicking sound

- Second one had pwer issue and picture error.

The second one was fixed quickly. Fuse holder plus Fuse was replaced and one loose wire at the brightness and contrast potis.

First one I ask Winnie for help. He is very experienced TV repair guy from the german forum AZ. So his report was

- O/W-Modulator defect
- wrong bridge coil with false pinout installed.

After the repair action from Winnie I`m now sure that both chassis works 100% bullet proof.

So I`ve installed the chassis again, but the game shows some missing colors and red stripe on areas with much contrast. Now I`ll take care about

- the harness,
- the missing fuse 10A for the transformator :)
- add the sense mod to ARII
- add again connectors for the PCBs
- clean the rusty pins on the PCB.

 
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bencao74

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Re: Pole Position plays blind
« Reply #43 on: August 06, 2012, 06:15:10 PM »
So my todo list was

- harness : fixed 50% could be better
- Replaced PCB connectors
- Fixed burned 5V pin on video connector
- Sense Mod
- cleaned the PCB

And I think I nailed the source for the missing red color.

I traced down the schematic for PIN 9 RED via R103->R59 -> down to

Custom PROM 136014-137.

This one has a strange addition from one of the pre-owners. There is a capacitor between pin 12 and GND.

When I cut this capacitor I get screen with lot of funny characters with red working. But the game isn't playable.

When I leave the cap in place the game works without red.

So I guess this PROM is defect. Additionally the pre-owner was trying to bridge the PROM.

Where can I get a new one? Is it possible to re-program this PROM?
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level42

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Re: Pole Position plays blind
« Reply #44 on: August 06, 2012, 07:05:10 PM »
Nope. PROMs can be programmed only once.

ROM = Read Only Memory, programmed during production in factory.
PROM = Programmable ROM, electrically programmable once, so Atari bought these empty and burnt them, not the chip maker
EPROM = Erasable Programmanle ROM, these can be erased with UV light and reprogrammed by "user".

Speleo_DE can program PROMs. he saved my butt when I accidently inserted a PROM the wrong war around in a friend's SW board. Thank god only the PROM was blown up, inserted the one Andreas' made and it was running great again.
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