Replacement Power Supply in Quadra 605

[Phipli]

Should also be noted that Meanwell rates them for 4.4A at 5V, so it's not too far off the "heavier" PSUs anyway. I'll definitely give these a look, with their medical rating these should be very robust supplies given their vital use, and may be a safer bet long-term than recapping the old supplies.

Thank you, the 4.0A someone quoted was confusing me. I knew they were short, but that felt more of a shortfall than I remembered.

 

[Tonata]

It was me. I checked again. Most sites cite 4.4A, but mouse.fr cuts after the dot, so it lists RPT-60A as 4A for the 5V.
4.4A is closer to the 4.75 and it should not be a big difference. I will buy one instead of recaping the old one.

 

[MrFahrenheit]

It was me. I checked again. Most sites cite 4.4A, but mouse.fr cuts after the dot, so it lists RPT-60A as 4A for the 5V.
4.4A is closer to the 4.75 and it should not be a big difference. I will buy one instead of recaping the old one.

Mean Well has two figures. 4.0A and a 4.4A “peak”. I imagine they warranty it only for 4.0A sustained.

My guess on the shift from 3.25A to 3.75A to 4+A by Apple was the realization that the 475 would get a PowedPc upgrade at some point, and the extra amps likely are needed for that, as Bolle mentions.

 

[Daniël]

My guess on the shift from 3.25A to 3.75A to 4+A by Apple was the realization that the 475 would get a PowedPc upgrade at some point, and the extra amps likely are needed for that, as Bolle mentions.

That would definitely make quite some sense, the card was being developed in 1993 and released the following year (if internet sources are correct), so with the 475 releasing in 1993, it might have not been initially considered.

That does make me wonder if Apple would contact customers of the PowerPC upgrade, if bought through mail order or over the phone, to check if their PSU would be able to handle the additional load, and if not, whether they'd provide a replacement PSU to support the card's needs.

 

[MrFahrenheit]

That would definitely make quite some sense, the card was being developed in 1993 and released the following year (if internet sources are correct), so with the 475 releasing in 1993, it might have not been initially considered.

That does make me wonder if Apple would contact customers of the PowerPC upgrade, if bought through mail order or over the phone, to check if their PSU would be able to handle the additional load, and if not, whether they'd provide a replacement PSU to support the card's needs.

An interesting find (attached PDF)

Scroll down to "Specifications Electrical - 12"

You'll see:

Electrical
Line Voltage 100–240 VAC, automatically configured Frequency
LC Series: 47–63
Quadra 605: 50–60

Maximum Power
LC/LC II: 50 W (not including monito
LC III: 30
Quadra 605: 26 W

Interesting to see that the maximum power draw is higher on the LC and LCII than with the LC3, and then even lower with the LC475/Q605. This runs contrary to the ratings on the power supplies for these units, I think (unless I'm interpreting these incorrectly?).

 

[cheesestraws]

Thought I'd post pics of my own variant on this, now that I've finally got it done.

Excuse terrible colour balance.



I ended up just drilling holes in the case, and it still fits... There is an insulating sheet made of thin plastic under the PSU board.

 

[Phipli]

Thought I'd post pics of my own variant on this, now that I've finally got it done.

Excuse terrible colour balance.

View attachment 62372View attachment 62373

I ended up just drilling holes in the case, and it still fits... There is an insulating sheet made of thin plastic under the PSU board.

Excellent work - looks like you went to the trouble of making the cable. If you're worrying about the clearance at all, grab yourself some countersunk screws.

 

[cheesestraws]

looks like you went to the trouble of making the cable.

There is something incredibly satisfying about a properly crimped connector. Even if I'm bad at it

If you're worrying about the clearance at all, grab yourself some countersunk screws.

I wasn't sure if I'd need to countersink but it turned out I could just use plastic screws left over from building airtalks, so that's fine

 

[Yodd]

I took inspiration from this thread and designed a similar mounting plate for the RPT-60A in the Dyna Comp DCF 353 PSU shell.

https://www.printables.com/model/776866-apple-lc-dyna-comp-lc-353-psu-meanwell-rpt-60a-mou

 

[trag]

this is a great idea, non-destructive edits are best.

the connectors on the Meanwell board are JST VH, get some maybe with leads already on and splice onto power switch etc.

I think that Phoenix Connectors also has those connectors. At least, I remember sourcing some for adapting ATX PS to the Umax S900. I'm not certain I got htem from Phoenix.