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In search of list of capcaitors for Delta SMP-220DB PSU (Apple P/N 614-0012)

aperezbios

aperezbios

6502
I'm looking for a list of capacitors/sizes/values for the Delta SMP-220DB PSU,as used in the PowerMac 8100/80 and Quadra 800/840AV. If anyone has created one, if you'd be so kind as to share it, that would be greatly appreciated. My 26-year-old PowerMac 8100/80 thanks you in advance :)

 
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aperezbios said:
I'm looking for a list of capacitors/sizes/values for the Delta SMP-220DB PSU,as used in the PowerMac 8100/80 and Quadra 800/840AV. If anyone has created one, if you'd be so kind as to share it, that would be greatly appreciated. My 26-year-old PowerMac 8100/80 thanks you in advance :)
Click to expand...
Did you ever attempt a recap?
 
I'm currently refurbishing one of these PSUs. I've dismantled it into its 5 boards, 4 of which have electrolytic caps. All are rated at 105ºC apart from the largest C1 + C2 which are 85ºC.

Here's a list, @aperezbios I'm guessing that you've moved on from this long ago, but it will help others.

SMP-220DP-1 (largest board that the other boards fit into)
CapacitorValueSize in mm
(length x dia)
C104, C1053300μF 10V36x13
C1062200μF 10V28x13
C1071000μF 10V20x10
C154, C1561000μF 16V28x10
C252, C807470μF 35V20x10
C253220μF 16V15x18
C51310μF 50V11x5

SMP-220DP (has the two largest caps)
CapacitorValueSize in mm
(length x dia)
C1, C2820μF 200V40x30
C301470μF 35V20x10
C3020.47μF 50V11x5
C3044.7μF 50V11x5
C9521μF 50V11x5

DC-267
CapacitorValueSize in mm
(length x dia)
C5072.2μF 50V11x5
C51122μF 50V11x5
C532, C60110μF 50V11x5
C655, C6744.7μF 50V11x5
C7831μF 50V11x5
C784100μF 25V11x7

DC-230 (smallest board)
CapacitorValueSize in mm
(length x dia)
C8042.2μF 50V11x5
 

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Here is a link to a Mouser cart for these caps:

The only ones missing are the big caps C1+C2. That's because there are no modern equivalents available, that I can see. I hope it will be OK to leave them in – on a couple of guides I've read/watched regarding PSU recapping, I am told that the very largest caps don't go bad or really need replacing.

I am going to place an order for these and hopefully resuscitate my dead supply.
 
I've got a dead one of these too, I'm interested to see if the recap works out for yours! Best of luck with it and thank you for providing a parts list!
 
I did the recap today and was unsuccessful in reviving my PSU. It's still failing in the same way as before, it clicks on and then off again. I'm glad I tried but I will go the ATX route, retaining the casing and fan and just changing the internals.

I made one error in the parts list above. C253 should be 220uF 16V, not 22uF. I have corrected the Mouser BOM as well.
 
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Hmm, I am considering having another look at the old PSU. I was thinking of checking components for shorts. I need a sense check here, is it worth trying?
 
I found 820uF caps for C1 and C2 on Mouser and updated the BOM (not sure what was going through my head when I looked last and couldn't see any, there are loads).

I am currently feeling motivated to check every single last component across the five boards that make up the PSU :cool:
 
I come back to poke at this PSU from time to time. This week, I replaced the large bulk capacitors which I’d omitted last time round.

IMG_4865.jpeg

This didn’t make any difference. I get a solid +5VSB, but as far as I can tell, the undervoltage protection circuit is being triggered when powered on.
 
I had a 9600 power supply (also a Delta unit) that blew an IC after an inrush current killed it. I'm pretty sure it was in a TO-220 package so it looked like a MOSFET or Schottky diode but it was some sort of VRM or other power control IC. It had failed but it wasn't obvious (the fuse was OK after replacing it, nothing was visibly damaged; it just wouldn't turn on) and without datasheets or schematics it took me a while of probing before I figured it out. Apparently I made a thread about it but never updated it with the resolution. I can't remember the specs of the device offhand or I would.

Anyway, check the silicon bits including looking up part numbers on them to figure out what they are so you can test them effectively. One of them may be an IC that has failed.
 
croissantking said:
I'm currently refurbishing one of these PSUs. I've dismantled it into its 5 boards, 4 of which have electrolytic caps. All are rated at 105ºC apart from the largest C1 + C2 which are 85ºC.

Here's a list, @aperezbios I'm guessing that you've moved on from this long ago, but it will help others.

SMP-220DP-1 (largest board that the other boards fit into)
CapacitorValueSize in mm
(length x dia)
C104, C1053300μF 10V36x13
C1062200μF 10V28x13
C1071000μF 10V20x10
C154, C1561000μF 16V28x10
C252, C807470μF 35V20x10
C25322μF 16V15x18
C51310μF 50V11x5

SMP-220DP (has the two largest caps)
CapacitorValueSize in mm
(length x dia)
C1, C2820μF 200V40x30
C301470μF 35V20x10
C3020.47μF 50V11x5
C3044.7μF 50V11x5
C9521μF 50V11x5

DC-267
CapacitorValueSize in mm
(length x dia)
C5072.2μF 50V11x5
C51122μF 50V11x5
C532, C60110μF 50V11x5
C655, C6744.7μF 50V11x5
C7831μF 50V11x5
C784100μF 25V11x7

DC-230 (smallest board)
CapacitorValueSize in mm
(length x dia)
C8042.2μF 50V11x5
Click to expand...

@Cory5412 please could you edit this table with the corrected value for C253, which should be 220uF, not 22uF. It’s confusing for people as they miss the correction I made further down in post #8.
 
I pulled out the exact same PSU I had lying under my bench for years. Back in 2015 it blew when the computer was powered on again after 15+ years. The last time I had it apart, I replaced some components on the 5V trickle supply as it was blown. Next I also discovered that one of the switching transistors and a zener diode next to it both blew, so I replaced both, but it still didn't react upon connecting the +5V_Trickle to the PSU_ON pin.

Today, upon measuring, all measurements looked fine, nothing blown, and I was getting both +5V_Trickle and +VCC (around 15V). I measured the ESR of the caps and C511 (22uF 50V) was reading bit high, so I replaced it, but nothing changed. Other caps that I was able to get to, measured all with really low ESR.

After bit more poking around, I decided to replace the LM339N on the control PCB, as some voltages on its pins it just didn't make sense. The PS_ON signal is directly connected to one of its pins also.
After I replaced the LM339N, the power supply sprang into life. I didn't test it for long, as I was running it from DC 200V lab power supply that is current limited at 30mA, and was exceeding it, and shutting down (the bench PSU, not the power supply). The output voltages were correct, and it did light up the 15W lightbulb on 5V and 12V rails.
Next, I will be reassembling it and testing more. I will connect the 200W lightbulb in place of a fuse if it decides to blow again.

@croissantking, I would suggest you check all the components on the control board, and perhaps go ahead and replace the ICs.

Also, there is one more thing...
On my PSU, both R955A and R955B resistors were blown, I substituted them with one 100 ohm resistor, which I don't think is the right value.
Can someone check the values on their PSU (or take a good closeup photo) of them?
 
Cory5412 said:
done!
Click to expand...
Thanks :)

mitchW said:
@croissantking, I would suggest you check all the components on the control board, and perhaps go ahead and replace the ICs.
Click to expand...

Sadly, it’s game over for this PSU.

One of the difficult things about working on it is that to properly swap out and test components you need to take the five boards apart, and then solder them back together again afterward. During my most recent session, I lost patience.

I had desoldered some of the components on the small DC-230 board on the primary side and forgot to reflow them. So when I plugged the unit back in, the safety caps (next to the bulk capacitors) popped with a huge bang. Nothing caught fire, but it definitely reinforced how much energy is stored in these parts and why we need to take great care whilst working on power supplies.

I wasn’t sure what other components might have got damaged during my mishap, and I didn’t feel like messing with it any more. I’m now working on an ATX rebuild that fits inside the original housing.
 
Oh well. I remembered that I must have another 8100 PSU somewhere, and found it in the attic, and it is 100% identical, and working. So I opened it, and checked the component values.
R955A and R955B are 180 ohms (0.125W).
So I replaced those resistors with the right values, and the power supply turned and stayed on for the 1st time connected to the mains (I used isolation transformer and 200W lightbulb in series). I added some load, and so far it is success!

Interestingly the PWR_ON pin is quite different from an ATX power supply, as it will latch on if you pull it high to the 5V_TRKL, and the power supply will run without the PWR_ON pin connected to anything (pulled high). If you want to shut it off, you then short the PWR_ON to ground, which will turn it off. quite different compared to the ATX which runs all the time, the PSU_ON pin is pulled low.

One more thing, found a small note inside the PSU of that time I first did the repairs. It says:
ZD2 (zener diode) is rated at 18V. ZD1 is most likely the same value.

Perhaps someone will find this useful in the future :)
 
mitchW said:
Oh well. I remembered that I must have another 8100 PSU somewhere, and found it in the attic, and it is 100% identical, and working. So I opened it, and checked the component values.
R955A and R955B are 180 ohms (0.125W).
So I replaced those resistors with the right values, and the power supply turned and stayed on for the 1st time connected to the mains (I used isolation transformer and 200W lightbulb in series). I added some load, and so far it is success!

Interestingly the PWR_ON pin is quite different from an ATX power supply, as it will latch on if you pull it high to the 5V_TRKL, and the power supply will run without the PWR_ON pin connected to anything (pulled high). If you want to shut it off, you then short the PWR_ON to ground, which will turn it off. quite different compared to the ATX which runs all the time, the PSU_ON pin is pulled low.

One more thing, found a small note inside the PSU of that time I first did the repairs. It says:
ZD2 (zener diode) is rated at 18V. ZD1 is most likely the same value.

Perhaps someone will find this useful in the future :)
Click to expand...
Helpful, not that distant into the future!
I'm trying to restore a Quadra 800 with the SMP-220DB PSU.
Fortunately I was able to test the logic board works well with a IIci PSU.
But... the SMP-220DB PSU is a completely different story - it's rusty, mega dirty, and at one point a lot of the Zener diodes have blown.
My plan is to do a full recap, test for shorted diodes, and replace broken diodes - but the Zeners have blown off their values so I can't make out what Zener diodes to replace with.
Schematics would be mega helpful - but I've been unable to find any.
So... if anybody can help out with values for the following (or some of the following) I would be very grateful:
  • ZD1 and ZD2 = 18V (thanks Mitch :) )
  • ZD301
  • ZD951
  • ZD952
  • ZD952
  • ZD701
  • ZD702
  • ZD601
  • ZD602
  • ZD603
  • ZD604
  • R952
  • R955A
  • R955B
  • R957
  • R303
 
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R955A and B are both 180 ohms.
If ZD1 and ZD2 are blown, then also both switching transistors are most likely blown...
 
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