Author Topic: Replacing the PSU in a 13-slot Digidesign expansion chassis  (Read 891 times)

Offline sequencers.io

  • Valued Member (10+ Posts)
  • **
  • Posts: 20
  • Junglist
  • Liked:
  • Likes Given: 4
Replacing the PSU in a 13-slot Digidesign expansion chassis
« on: March 10, 2021, 11:24:00 AM »
I recently purchased a 13-slot Digidesign PCI expansion chassis off Ebay. It came with a Mix Farm, Mix Core & SampleCell II+ cards.

After getting it, the CBL1HF cable, & PCI host interface, I put my Korg Oasys, Keyspan SX Pro & Creamware Scope SP cards in it.

Noticed that the chassis turned on immediately after plugging in the power cable, so the power button doesn't work. However, it ran OK without issue for about 90 minutes before I heard a "pop" and then all the fans turning off. Seems like the power supply is blown. I put an AC voltage detector on the bundle of wires leaving the PSU and there was no activity detected.

The PSU in the machine is a 3P KPP401-40 400W. The PCI backplane board is a PCI13BP. Here are the PSU specs:

3P PACIFIC POWER PRODUCTS
Model No.: KPP401-40 MAX. O/P: 400W
Rev: M-02

AC I/P . . . . . . . . . . . . . DC O/P

100-120Vac /8.0A . . . . . . . + 5V 50.0A
200-240Vac /5.0A . . . . . . . + 12V 27.0A
50/60Hz . . . . . . . . . . .  - 5V 1.0A
AutoSelect . . . . . . . . . . - 12V 3.0A
. . . . . . . . . . . . . . .  + 3.3V 30.0A
. . . . . . . . . . . . . . .  + 5Vsb 1.0A


From what I've read elsewhere, the 50AMP rating on the +5V rail makes this PSU relatively rare.

I've found more or less the same PSU on Ebay: https://www.ebay.com/itm/New-3P-KPP401-40-Power-Supply-Input-1100-1120-200-240VAC-Max-O-P-400W/313155780333 It's a different revision, which I am guessing is the power switch on the back.

My options are:

  • Send this chassis back and get my money returned (I paid $600)
  • Try to get a partial refund of some kind and replace the PSU with the PSU I found on Ebay
  • Try to get a partial refund and get the PSU repaired

If I opt for #3, does anyone have any recommendations for someone who could repair my PSU? Would it be cheaper than $200?
G4 MDD 1.25GHz (dual) with 1.75GB RAM, 500GB SSD, Metric Halo 2882, Adaptec 2930CU/2940UW, Keyspan SXPro, Opcode Studio 5

Offline Philgood

  • Gold Member (200+ Posts)
  • *****
  • Posts: 392
  • Liked:
  • Likes Given: 23
Re: Replacing the PSU in a 13-slot Digidesign expansion chassis
« Reply #1 on: March 11, 2021, 09:49:10 AM »
I was in the same situation like you a while ago.
I also was concerned about the wattage on the 5V rail but
ended up putting in a spare/parts PowerSupply from work and haven't had any problem.
BUT...you have quite a mix of different cards so your needs may vary.
Can give you the specs of mine if you want to provide some guidance.
Wouldn't spend too much on it.
*G4 MDD 1.25GHz (Single 2003)* with 2x 80Gb harddrives, 1Gb RAM, Tascam US-428 and Edirol FA-101 USB/Firewire soundcards-*iMac G3 DV 400MHz* with installs from OS 8.6-OSX Tiger on different harddrives-*Powerbook G4 1.67Ghz* with new SSD ! Love it.

Offline sequencers.io

  • Valued Member (10+ Posts)
  • **
  • Posts: 20
  • Junglist
  • Liked:
  • Likes Given: 4
Re: Replacing the PSU in a 13-slot Digidesign expansion chassis
« Reply #2 on: March 11, 2021, 05:58:40 PM »
Thanks for the feedback. I think I'll pop over to Vogons and see what they have to say about it, given there appears to be a lot of knowledge there re: PCI backplanes, etc.
G4 MDD 1.25GHz (dual) with 1.75GB RAM, 500GB SSD, Metric Halo 2882, Adaptec 2930CU/2940UW, Keyspan SXPro, Opcode Studio 5

Offline teroyk

  • Gold Member (200+ Posts)
  • *****
  • Posts: 411
  • -
  • Liked:
  • Likes Given: 38
Re: Replacing the PSU in a 13-slot Digidesign expansion chassis
« Reply #3 on: March 12, 2021, 04:27:53 AM »
Newer model works with normal ATX PSU (I have replaced one with PSU made by Seasonic) and the oldest expansion chassis models works with AT-PSU.
I bought my first new Mac when OS X 10.1 released. And I bought that Mac because it had Mac OS 9 too. And I bought my first 68k Mac when Apple stopped PPC Macs.

 


SimplePortal 2.3.6 © 2008-2014, SimplePortal