Black vertical lines on ST

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czietz
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Joined: Sun Jan 14, 2018 1:02 pm

Re: Black vertical lines on ST

Post by czietz »

If you read the AtariForum thread, there I suggested checking the connection from the RAM chips to the Shifter. (... and I was right back then.)
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Black vertical lines on ST

Post by Steve »

Thanks guys, after checking continuity from the shifter to the ram as suggested by @czietz (pin 2 of every ram chip) I had no continuity on D3 (between ram chip U24 and pin 6 shifter) but after tracking the trace through the board it all seemed fine, then I realised it is the shifter socket which is at fault. I get continuity on pin 6 with shifter removed, continuity dissapears when shifter is inserted. I'll replace the socket next and let you know if it fixes it. Thx for all the help so far guys.

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Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Black vertical lines on ST

Post by Steve »

A picture tells a thousand words, thank you everyone I've learned a great deal during this. Also! I think we should add 'remove/replace any single leaf sockets!' to mandatory fixes :)

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PhilC
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Re: Black vertical lines on ST

Post by PhilC »

:cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer:
If it ain't broke, test it to Destruction.
zChris
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Re: Black vertical lines on ST

Post by zChris »

Good job! I wonder what can make it have no continuity when the chip is inserted.

/zChris
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Black vertical lines on ST

Post by Steve »

zChris wrote: Mon Sep 13, 2021 12:57 pm Good job! I wonder what can make it have no continuity when the chip is inserted.

/zChris
Because they are 'single leaf' (I think it is called) they can easily lose contact. Where as double leaf kind of 'clamps' the leg when pressure is applied.
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exxos
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Re: Black vertical lines on ST

Post by exxos »

:bravo:

3M all the way ;)
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