[Premium-Rx] Cubic R-3030/80 Power Supply

[Todd K. Rodgers]

Hello group

I've got a Cubic R-3080 (half width) receiver. It's been working fine 
for 10 years now. On the last power up attempt, nothing. Removing 
covers, the power supply has faulted. I warm up the soldering iron, pull 
out the VOM and know to look for bad electrolytics, blown thermistors, 
etc. I pull out the manual, start comparing the power supply schematic 
to what I have and it just doesn't look the same.

I then notice that the power supply part number on the exterior of the 
module is ASSY NO. 2871-1104, then that the diagonal stripe on the 
module top face actually "slopes" in the opposite direction from all 
other modules (no straight "line" here) and isn't in the last module, 
right most (viewing from front of chassis, top side) position. Opening 
up the power supply module (not ever done before) reveals some evidence 
of modification, and some gunky stuff around the large filter caps 
(perhaps original glue to affix the device better to the board, perhaps 
leakage). The internal board layout doesn't match any of the 
drawings/schematics I've been able to get my hands on.

Anyway, the repair operation can take two routes:

  * Trace out everything, make sense of this "new" circuit", and
    judiciously replace parts and restore this odd power supply to
    working order
  * Or, attempt to replace all innards with modern switching power
    supplies for +-16VDC and 8VDC (either mounted in the original power
    supply casing or externally). I'm guessing heat generation might be
    an issue (so perhaps best to avoid linear supplies) so don't want to
    go overboard.

The second option begs the question what current level outputs are 
required for the 3 voltages? Does anyone on the list have any ideas?

Any thoughts/suggestions, most appreciated. Any source of original and 
appropriate power supply modules (ASSY NO. 2140-1124) also of interest.

thanks!

Todd, KC1SQ