General Category > Lisa Troubleshooting and Repair
Edge Connector Replacement
fri0701:
I'm looking to repair the edge connectors that the CPU, I/O, and two memory boards plug into on the backplane (they're pretty corroded). Does anyone have a particular supplier or type that they've used and trust that they could send a link to?
Thanks!
sigma7:
There aren't a lot of choices for manufacturers of card edge connectors, so you may be limited by what is in stock.
You do want to get a version that has gold plating on the contact/mating surfaces.
"AMP" (now "TE Connectivity") was one of the gold standards in the previous century and one would pay for that quality, but at this time I think any well known brand should be fine for this purpose.
There are lots of potential variations/options so look carefully to make sure the solder tails will fit and the plastic doesn't have any flanges that will interfere with other parts on the board or other oddities that make it fit a different design of board (eg. with a notch in it).
For CPU and I/O connectors...
Searching DigiKey today, there are 2 possible parts in stock with 120 contacts, dual readout, 0.100" spacing, vertical, solder tail, etc. ~$13 each. Both with mounting ears which you may need to cut off.
Mouser has 1 possible part (without ears) ~$19.
My choice today would be:
Jameco.com pn 2133536 is about $1 for a TE Connectivity 645235-8
https://www.jameco.com/z/645235-8-TE-Connectivity-Solder-Post-Edge-Connector-60-Positions-120-Contacts-2-54-mm_2133536.html
For Memory boards:
DigiKey has 9 potential parts; one is TE 5530843-7
https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/5530843-7/770546
Mouser has the same part
https://www.mouser.com/ProductDetail/TE-Connectivity/5530843-7?qs=CWN9I2qbSLtja0SlxvLT%2FQ%3D%3D
Al Kossow:
sort of related..
how do people debug lisa cards?
have you built a edge card extender cable to be able to work on the cage outside the chassis, or just have a backplane, et. al. spare to work outside of the confines of the original case?
we just did some photos of the prototype Lisa that we have, and even back then they didn't have a cutout in the top of the sheet metal to put extender cards into the backplane.
blusnowkitty:
--- Quote from: Al Kossow on December 19, 2022, 04:18:19 pm ---sort of related..
how do people debug lisa cards?
have you built a edge card extender cable to be able to work on the cage outside the chassis, or just have a backplane, et. al. spare to work outside of the confines of the original case?
we just did some photos of the prototype Lisa that we have, and even back then they didn't have a cutout in the top of the sheet metal to put extender cards into the backplane.
--- End quote ---
Patrick and Tom both came up with expansion card extensions a while ago over on: https://lisalist2.com/index.php/topic,109.0.html
stepleton:
--- Quote ---Patrick and Tom both came up with expansion card extensions a while ago over on: https://lisalist2.com/index.php/topic,109.0.html
--- End quote ---
To be precise, I got 95% of the way there, but my expansion card wasn't quite the right shape. Life and other projects intervened before I tried to refine the shape. I'll get back to it someday, someday, someday... (echoes fade into the distance)
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