68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
Noob SE/30 question: how do you attach the backplate for a PDS card?
Posted by: s_pupp on 2023-11-14 08:36:02 Extreme close-up of @LaPorta's earlier photo looks like the coarse-threaded self-tapping screw I also pictured, and not like a 4-40. Look at the thread pitch: View attachment 65171 It’s easy to get the screws wrong when reassembling a case. If you disassemble a stock, undisturbed SE/30, though, you should find three fine threaded screws holding the bracket in place, and one coarse screw for the ground - at least, that’s been my experience with ten SE/30’s.
Posted by: zigzagjoe on 2023-11-14 09:22:10 Both of my SE/30s came with (apple) self-tapping screws for the expansion card brackets.
Posted by: s_pupp on 2023-11-14 10:59:09 Both of my SE/30s came with (apple) self-tapping screws for the expansion card brackets.View attachment 65177 Interesting. I have just confirmed my experience above with the other chassis I have within easy reach. Both chassis are stamped with the same part number “805-0938 C.” If your SE/30’s were not previously touched, it would suggest that some SE/30’s came with the 4-40, and others came with the self tapping screws. Out of curiosity, I would be interested to know if the chassis part number is different on those that came with brackets held on by self-tapping screws.
Posted by: bigmessowires on 2023-11-14 12:37:06 I went to the hardware store and got some 4-40 machine screws and #4 self-tapping sheet metal screws (not sure if there's a number for thread pitch on those). The 4-40 did not fit my chassis. They're about the right diameter, but they don't thread in. The sheet metal screws went in fairly easily. Bracket is installed!
Posted by: s_pupp on 2023-11-14 12:53:26 I am glad you got it sorted, and regret that my experiences proved not to apply in your case. I was unaware that variations existed. Just out of curiosity, you happen to have easy access to the part number of your chassis? It’s location is as shown here:
Posted by: bigmessowires on 2023-11-14 13:08:58 It's the same as yours: 805-0938-C
Posted by: s_pupp on 2023-11-14 13:50:56 It's the same as yours: 805-0938-C Thanks for checking. I suppose then there’s no shortcut - it’s just a matter of trying one screw, and if it doesn't work, then trying the other.
< 2