Hi,
Back after a long hiatus with some old power supplies that need repairing. I've recently picked up a couple of 386SX systems, two 486DX systems, a SiliconGraphics Indy and an iMac G3 that either have verified leaking capacitors in their power supplies, or are likely to in the near future. For the sake of simplicity, instead of tackling all at once, I'm starting with the 386's and one of the 486's.
The 386's power supplies are Seasonic SS4040A's, with caps that are visibly leaking, and 9 replacement caps per unit are required. Most appear to be from the Rubycon YXB series, although due to the placement of some others it's difficult to tell if all of them are.
The 486 uses an ASTEC power supply, with caps that aren't visibly leaking, but while I have an order open and the power supply disassembled for cleaning, it's a good time to get some to have on hand. This unit uses a mix of Chemi-con capacitors -
For the 386's I'm leaning toward the Panasonic FC series. That's based on another post I read around here a while back that suggested they would be a fitting replacement for the YXB series, they're reasonably cost-effective, and they seem to be more readily available - more so than the other brands - from the various online electronic suppliers that operate in Australia. Other brands are available of course, but either not a complete range (so some mixing and matching is required) or in lower quantities / back-ordered to a future date.
As for the Chemicon LXF and SME series, I'm not sure what their ideal equivalents are.
These are relatively light-duty supplies, running infrequently and in not particularly hot environments (except maybe an Australian summer sometimes). I'd still opt for 105C rated components as that seems to be what was specified from factory, but other than that, I don't suspect they need anything too fancy or exotic.
And if anyone wants to know why I don't just replace them with a more modern power supply - they're AT by spec, but far from the standard AT form factor.
Cheers,
Mic.
Back after a long hiatus with some old power supplies that need repairing. I've recently picked up a couple of 386SX systems, two 486DX systems, a SiliconGraphics Indy and an iMac G3 that either have verified leaking capacitors in their power supplies, or are likely to in the near future. For the sake of simplicity, instead of tackling all at once, I'm starting with the 386's and one of the 486's.
The 386's power supplies are Seasonic SS4040A's, with caps that are visibly leaking, and 9 replacement caps per unit are required. Most appear to be from the Rubycon YXB series, although due to the placement of some others it's difficult to tell if all of them are.
Code:
10v 1000uF x3 16v 47uF x2 16v 470uF x2 25v 100uF x1 50v 22uF x1 Mains: "Omats K112" 400v 100uF x1
Code:
Chemicon LXF 6.3v 1500uF x1 6.3v 2200uF x1 10v 270uF x1 16v 2200uF x2 Chemicon SME 25v 47uF x2 Mains: Nichicon CE 200v 470uF x2
For the 386's I'm leaning toward the Panasonic FC series. That's based on another post I read around here a while back that suggested they would be a fitting replacement for the YXB series, they're reasonably cost-effective, and they seem to be more readily available - more so than the other brands - from the various online electronic suppliers that operate in Australia. Other brands are available of course, but either not a complete range (so some mixing and matching is required) or in lower quantities / back-ordered to a future date.
As for the Chemicon LXF and SME series, I'm not sure what their ideal equivalents are.
These are relatively light-duty supplies, running infrequently and in not particularly hot environments (except maybe an Australian summer sometimes). I'd still opt for 105C rated components as that seems to be what was specified from factory, but other than that, I don't suspect they need anything too fancy or exotic.
And if anyone wants to know why I don't just replace them with a more modern power supply - they're AT by spec, but far from the standard AT form factor.
Cheers,
Mic.
and usually mix and match whatever are the cheapest (quality) caps at the time. So more often than not, my recapped PSUs have a mix of various Japanese brands in them. 
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