M648 48v supply
62 views
Skip to first unread message
Caleb Lambert
Dec 19, 2018, 1:11:16 AM12/19/18
to WBSps - Ward-Beck Systems Preservation Society
Hey team,
I have here two M648 48v power supplies. They are both missing parts and both have fried boards with lifted pads and traces. Im hoping i can make one good supply from what i have here.
One unit is from 1970, the other "75.
Neither look like the schematic in the archive which has a 1983 date.
I have here two M648 48v power supplies. They are both missing parts and both have fried boards with lifted pads and traces. Im hoping i can make one good supply from what i have here.
One unit is from 1970, the other "75.
Neither look like the schematic in the archive which has a 1983 date.
1) are there schematics for either of these earlier iterations?
2) maybe i dont need to rebuild the pcbs? The literature says that the regulated current is only neccessary when NOT mounting the supply inside of a console, which I am. Can i just bypass the board?
\\m//,
Caleb
Charles Beauregard
Dec 19, 2018, 1:33:49 AM12/19/18
to Caleb Lambert, WBSps - Ward-Beck Systems Preservation Society
I would repair both of them. I recently redone 6 in the same kind of shape. Just repair the traces where needed, replace the cap and put new resistors. The ones that heat the pcb. Install them with ceramic spacers so they stop heating the pcb. You can also use a bit larger resistors so they dissipate heat better.
Le mer. 19 déc. 2018 01:16, Caleb Lambert <calebmea...@gmail.com> a écrit :
1970 on the left, 1975 on the right.Which one would YOU rebuild?...
--
You received this message because you are subscribed to the Google Groups "WBSps - Ward-Beck Systems Preservation Society" group.
To unsubscribe from this group and stop receiving emails from it, send an email to WBSps+un...@googlegroups.com.
To post to this group, send email to WB...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/WBSps/CAC95cwQtd4nk1uvE5dkBggcPmtLyunX2scg1Cx%2BgnpEhdMmPfw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
Anthony Kuzub
Dec 19, 2018, 2:14:52 AM12/19/18
to Charles Beauregard, Caleb Lambert, WBSps - Ward-Beck Systems Preservation Society
To view this discussion on the web visit https://groups.google.com/d/msgid/WBSps/CAE0sdFSmqA%2BjR5OfdXjLFjjCq4Hw41zM9J%3DSA9tE0fFcekNWkg%40mail.gmail.com.
Anthony Kuzub
Dec 19, 2018, 3:22:51 PM12/19/18
to Charles Beauregard, Caleb Lambert, WBSps - Ward-Beck Systems Preservation Society
Caleb Lambert: "Thanks for the schematics! That does seem to describe the older one."
You have to pull it out and get a board number. More details lead to other details.
Charles Beauregard
Dec 19, 2018, 9:09:52 PM12/19/18
to Anthony Kuzub, Caleb Lambert, WBSps - Ward-Beck Systems Preservation Society
Pictures showing the new resistors I was talking about with ceramic spacers.
To view this discussion on the web visit https://groups.google.com/d/msgid/WBSps/CAKiKWgyDiVcjRtqbjn2fx7%2BTZyk4M%3DRN1BhW5i24%2BTm6aTi3kA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
Anthony Kuzub
Dec 19, 2018, 9:13:55 PM12/19/18
to Charles Beauregard, Caleb Lambert, WBSps - Ward-Beck Systems Preservation Society
pop screw, remove pcb. it's etched in the pcb
To view this discussion on the web visit https://groups.google.com/d/msgid/WBSps/CAE0sdFR9nHN2oLfM2fWdVB6c3x1%2BuzNxnc9VTfTGHVBhAqhmrg%40mail.gmail.com.
Reply all
Reply to author
Forward
0 new messages