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Quadra/LC/Performa 630 Power Supply Re-cap

Fizzbinn

Well-known member
Reposting from archive.org, thanks @SuperSVGA (https://68kmla.org/bb/index.php?thr...is-back-migrated-to-xenforo.38350/post-415052)

I haven't been able to find much in the way of re-capping info for the power supply for the Quadra 630, LC 630, Performa 630 series machines so I'm going to document my progress here in the hopes it ends up helping others.

The power supply I have is from a Quadra 630 badged machine. Apple's Service Source document labels the power supply as "661-0170" but the unit I have is actually labeled:

Apple Part Number: 614-0037
ASTEC Model Number: AA19300
+5V 80mA continuous
+5V 7.9A
+12V 2.15A
-12V 0.2A

Q630-ps-label.jpg.be6126c4813f55670ef030bdde2d4485.jpg


Taking apart the power supply is not tricky, unfortunately you do need to de-solder the AC input connector.

One side is open, the top is easily removed (two screws):
IMG_1305.thumb.jpg.875cafa02b0392c582e3e923823e5781.jpg


Six screws on one side appear to secure the case to heatsinks:
IMG_1306.thumb.jpg.8d0771aab978536352c82536e8653f7b.jpg


On one end you need to cut a zip tie:
IMG_1309.thumb.jpg.412f3bdfd1776e6232a09d37a84192e6.jpg


There are 3 screws through the board to the bottom that aren't too hard to find.
But the board can't be removed until you take care of the AC input that needs to be desoldered:
IMG_1310.thumb.jpg.2c57354ea5fdaaf7801f6fe3d0f86084.jpg

IMG_1311.thumb.jpg.58fb08d3a52852151b2a8a744bfc35de.jpg


Next up, capacitor location diagram and info!
 

Fizzbinn

Well-known member
Apple Part Number: 614-0037
ASTEC Model Number: AA19300

Electrolytic Capacitor List:
C3 - 390µf | 400WV d:30mm h:48mm
C8 - 22µf | 35V d:6mm h:8mm
C10, C19 - 1000µf | 16V d:10mm h:28mm
C12 - 470µf | 10V d:8mm h:15mm
C14 - 10µf | 50V d:5mm h:12mm
C18 - 1000µf | 35V d:12mm h:30mm
C21, C26 - 3300µf | 16V d:12mm h:40mm
C22 - 2200µf | 10V d:12mm h:25mm
C24 - 220µf | 35V d:8mm h:20mm
C25 - 470µf | 16V d:8mm h:20mm
C40 - 47µf | 25V d:8mm h:8mm

ASTEC-AA19300-Q630-PSU-capacitors.thumb.png.39b28ce5b4bac8d988cd535714977fd7.png


Notes:
The installed C40 capacitor is larger diameter than the board markings would indicate, I'll probably look to replace with a 5mm diameter cap.
The C10 and C14 capacitors are beneath the top of a metal heat sync plate making them a bit more difficult to access but doable.
 

Fizzbinn

Well-known member
I ordered the following replacement electrolytic capacitors from Mouser:


C3 - 390µf | 400WV - d:30mm h:48mm
871-B43545B9397M000

C8 - 22µf | 35V - d:6mm h:8mm
647-USV1V220MFD

C10, C19 - 1000µf | 16V - d:10mm h:28mm
647-UPW1C102MPD

C12 - 470µf | 10V - d:8mm h:15mm
647-UPM1A471MPD1TD

C14 - 10µf | 50V - d:5mm h:12mm
647-UPV1H100MFD

C18 - 1000µf | 35V - d:12mm h:30mm
647-UPJ1V102MHD

C21, C26 - 3300µf | 16V - d:12mm h:40mm
647-UPA1C332MHD

C22 - 2200µf | 10V - d:12mm h:25mm
647-UPJ1A222MHD

C24 - 220µf | 35V - d:8mm h:20mm
647-UPW1V221MPD6TA

C25 - 470µf | 16V - d:8mm h:20mm
647-UTT1C471MPD

C40 - 47µf | 25V - d:8mm h:8mm
647-UTT1E470MDD - Note: d=6.3mm (better fit)

...and after an evening of soldering ....and cleaning ...and triple checking polarities ...and that there weren’t any solder bridges...

Success! Quadra 630 is back to working order!IMG_0564.jpeg

Still need to figure out a retrobrite plan...
 

mattsoft

Well-known member
Nice write-up! I just did my Performa 630 motherboard and power supply last weekend and then 40MHz mod today. It's a snappy 68k Mac running at 40MHz! Also surprised that Apple used Nichicon caps in these "cheap" computer power supplies, though a couple of the smaller ones had just started to leak their guts on this unit. Did you have much leakage on yours?
 

Fizzbinn

Well-known member
Did you have much leakage on yours?
Yes, pretty much all of them but the largest one. C8 was the worst, its residue seems to have burnt up on the nearby R44. This is a picture after I removed the caps and did my best with isopropyl alcohol and qtips to clean the board. I was worried R44 might be damaged but with the new caps its now working just great.

IMG_1316.jpeg
 

mattsoft

Well-known member
Interesting, C8 and C18 were the 2 offenders on my PSU. They had both leaked and the mask on the other side of the PCB was damaged.
 

Fizzbinn

Well-known member
Nice write-up! I just did my Performa 630 motherboard and power supply last weekend and then 40MHz mod today. It's a snappy 68k Mac running at 40MHz!

Forgot to say thanks for the compliment! Curious, did you put a heat sink on the 040 chip? The 6xx case fan is right over the CPU so it may not be that big a deal on this model. Haven't decided what I want to do with mine yet.

Interesting, C8 and C18 were the 2 offenders on my PSU. They had both leaked and the mask on the other side of the PCB was damaged.

As I recall most of my power supplies' caps hadn't leaked all that bad yet (enough that it wasn't working!) some likely could have still been working but just the same I like to replace them all when I'm in there. I don't recall any damage to the other side of the PCB thankfully.
 

jjilek

New member
Yes, pretty much all of them but the largest one. C8 was the worst, its residue seems to have burnt up on the nearby R44. This is a picture after I removed the caps and did my best with isopropyl alcohol and qtips to clean the board. I was worried R44 might be damaged but with the new caps its now working just great.

View attachment 32412
Hi.
I have another Astec power issue on my Macintosh. My power supply has a bad R43 resistor and now I don't know its resistance value. Is it possible for someone to look at your PSU and measure or read its value? With great thanks, J.
 

Hellion

Member
Hi.
I have another Astec power issue on my Macintosh. My power supply has a bad R43 resistor and now I don't know its resistance value. Is it possible for someone to look at your PSU and measure or read its value? With great thanks, J.
Hi, sorry late answer. The R43 resistor in my Astec AA19300 is rated at 220 ohm. (Red, red, brown, gold).
 

Hellion

Member
Thanks for a brilliant thread. As you, I have missed info on restoring these PSUs. There are more than enough on the pizza box LCs supplys but these ones seem to be a bit forgotten!

I have a dead Astec that I replaced the caps on (and one that I haven't touched yet), it then powered up the machine but it got stuck in a loop where it restarted itself after just a couple of seconds. Any ideas? I noticed a lot of gunk around C10, witch I can see in one of OPs pictures as well but it seems to have been cleaned off there but still drowning the nearby green resistor. I was not sure if that was capacitor juice or just some kind of glue that was supposed to be there... It's present on both my Astec PSUs. Also, R44 seem to be burned around on the board but that seems common without affecting it. Might be good to swap it anyways I guess... If anyone can provide me with the value since I can't read it, it would be awesome!

I've also got two DynaComp PSUs from the same computers, that does not work either. But in these, no capacitors gives the obvious ocular signs of failing, but I will try to recap one of them to see what happends. Does anyone have any statistics on witch (DynaComp or Astec) of the PSU makes that are more/less prone to failure?
 
Last edited:

Redatoons

New member
Thanks for a brilliant thread. As you, I have missed info on restoring these PSUs. There are more than enough on the pizza box LCs supplys but these ones seem to be a bit forgotten!

I have a dead Astec that I replaced the caps on (and one that I haven't touched yet), it then powered up the machine but it got stuck in a loop where it restarted itself after just a couple of seconds. Any ideas? I noticed a lot of gunk around C10, witch I can see in one of OPs pictures as well but it seems to have been cleaned off there but still drowning the nearby green resistor. I was not sure if that was capacitor juice or just some kind of glue that was supposed to be there... It's present on both my Astec PSUs. Also, R44 seem to be burned around on the board but that seems common without affecting it. Might be good to swap it anyways I guess... If anyone can provide me with the value since I can't read it, it would be awesome!

I've also got two DynaComp PSUs from the same computers, that does not work either. But in these, no capacitors gives the obvious ocular signs of failing, but I will try to recap one of them to see what happends. Does anyone have any statistics on witch (DynaComp or Astec) of the PSU makes that are more/less prone to failure?
Hello, i bought 2 performa 630 recently now making 3 of em
on both power supply R44 apears to be brown/orange/green /Red
i wanna add that it looks to be burned too
and last note anyone has the value of R23 ? all of them are burned like hell and i think i can barely read orange/green/gold/brown or smth like that, ty
 

bigmessowires

Well-known member
C10, C19 - 1000µf | 16V d:10mm h:28mm
For anybody revisiting this in the future, double check this value. Like the OP, I also have an Astec AA19300, but mine has 1200 uF 16V for C10 and C19, not 1000 uF. My PCB also says -03C in the bottom-right corner, while OP's says -03A.

I'd ordered replacement caps based off of this list, so now I'm trying to decide if I should order some 1200's and wait a week to finish recapping, or use the new 1000's I already bought, or leave the original 1200's installed. I wish there were a 24-hour capacitor store around here... mail order is so slow. :)
 

imactheknife

Well-known member
For anybody revisiting this in the future, double check this value. Like the OP, I also have an Astec AA19300, but mine has 1200 uF 16V for C10 and C19, not 1000 uF. My PCB also says -03C in the bottom-right corner, while OP's says -03A.

I'd ordered replacement caps based off of this list, so now I'm trying to decide if I should order some 1200's and wait a week to finish recapping, or use the new 1000's I already bought, or leave the original 1200's installed. I wish there were a 24-hour capacitor store around here... mail order is so slow. :)
I recapped my 630 psu and still dead.. sucks! Was dead when i bought it. Have a. 6300 coming tomorrow so will check out that psu. I would wait for 1200’s! I know, a corner cap store would be sweet lol
 

bigmessowires

Well-known member
Amazon came through with 1200 uF 16V capacitors and next-day delivery.

Bummer about your 630 PSU. I've heard these particular power supplies aren't well-designed and are especially failure prone. Mine has been working OK, but I wanted to recap it to help keep it that way. It looks clean inside, no obvious signs of leaking caps yet. Maybe the revision -03C that I have included some improvements from the failures of earlier versions? It looks identical to the -03A, but the differences might be subtle.

I noticed something odd about the dates. My PSU is from a Performa 6214CD, which was discontinued in 1996. The PCB in the PSU says copyright 1994, but a sticker on the bottom of the PSU housing says "Date: 9906 C2 Rev: C". That date code sounds like 1999. Maybe the PSU failed once early in its life, and was replaced?
 

bigmessowires

Well-known member
I finished recapping my 6200's logic board and PSU, and everything still works! But for an already-working system like mine was, I'd absolutely not recommend doing the PSU recap - not worth the hassle. It was a real chore disassembling the case to extract the PSU, and the PSU itself was no picnic either. I think I had to remove about 20 screws and bend some pieces of sheet metal, and somehow I had five extra screws left over once everything was reassembled. Next time I'll just drop the 6200 off a cliff and claim it was an accident, then move on to a different Mac.
 

imactheknife

Well-known member
I finished recapping my 6200's logic board and PSU, and everything still works! But for an already-working system like mine was, I'd absolutely not recommend doing the PSU recap - not worth the hassle. It was a real chore disassembling the case to extract the PSU, and the PSU itself was no picnic either. I think I had to remove about 20 screws and bend some pieces of sheet metal, and somehow I had five extra screws left over once everything was reassembled. Next time I'll just drop the 6200 off a cliff and claim it was an accident, then move on to a different Mac.
yeah, i agree these are no fun. I just bought a 6300 and something had exploded in the psu. I replaced all parts and it worked. I then recapped it, yea stupid me, and now it tries to turn on but no lol.. aggravating!
 

Angelov68k

Member
Hello Gentlemen!

Here is my report of another successful LC 630 PSU (ASTEC AA19300) recap.
Thanks to the original author Fizzbinn for making it easy for us!

It looked like the typical problem that many friends here describe - C8 leaking on top of hot components, C40 also looks compromised:
1699819831863.png

Cleaning up around and installing fresh Panasonic caps:
1699820266166.png


On the other side of the heat sink, the group of Nichicon caps looked fine, but as I was already there I decided to replace them as well. Also, I had the replacements already:
1699820399969.png

1699820485467.png

Then, I was not able to remove the glue that holds C3 and C12. I left them for now, but I am intending to remove them (acetone maybe).
So putting it quickly back together to test with the rest of the LC, I was happy to see the result:

View attachment 401161318_6853641504679497_3845537987202102580_n.mp4

Cheers!
 

Megantonneke

New member
I have also so Performa 630 with a faulty PSU. With C9 as the main culprit, a typical problem for this PSU it seems. I also replaced C40 as being suspect. PSU is back and running again. The rest of the capacitor looks fine, so I left them for now.
 
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