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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.
 
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