exxos's Atari, Amiga & retro forum

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.)

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.

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 :)

:cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer:

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

/zChris

zChris wrote: 13 Sep 2021 12:57 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.

:bravo:

3M all the way ;)