Replacement Power Supply in Quadra 605

Phipli

Well-known member
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

Member
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

Well-known member
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

Well-known member
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

Well-known member
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?).
 

Attachments

  • quadra_605.lc_series.pdf
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cheesestraws

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

Excuse terrible colour balance.

IMG_2855.jpgIMG_2856.jpg

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

Well-known member
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

Well-known member
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 :)
 

trag

Well-known member
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.
 

acn128

Member
Hi!
I tried to replace the PSU from my Performa 475 (TDK brand) with a RPT-60A.
I bought some connectors (JST-VH) and crimped them to the original cables, so no soldering had to be done to the Meanwell PSU.

To mount the Meanwell in the case, I 3D-printed the base by SpocksBeer (from Post #21) in PETG and screwed everything together.

But when powering it on on my workbench (without the computer attached), I only heard a loud bang and the fuse blew...
After a while, I looked inside the case, and it seems that a spark between a heatsink (HS1 on the Meanwell documentation PDF) and the metal case ignited.
I have to admint that I forgot to add insulation between the PSU and the upper case, so that might have been the problem...
(Oh, and the PSU seems to be dead now, but I've already ordered a replacement...)

My question here is: Do I have to take anything else into account before burning the next RPT-60A? :)
I've added a layer of duct tape and electrical tape on the cover.
I also included the connection between the outer case and the two screws M1 and M2 as noted in the documentation ( https://www.meanwell.com/Upload/PDF/RPT-60/RPT-60-SPEC.PDF )
Do I need to add something else?

Thank you very much!

Regards,
Anna
 

Attachments

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  • 475_PSU_2.jpg
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