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Victor 9000 PSU

Gary C

Gary C

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Joined
May 26, 2018
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Location
Lancashire, UK
So today I got our V9k up and booting again, only for the PSU to fail

As its the hard drive version, the PSU is version 2 and significantly different from the one in the service manual.

Does anyone have a drawing of the 100750-02 PSU ?
 
I haven't ever seen one. Several folks have been looking for the schematics for the other power supply. The only material I've seen on repairing it is in the wayback machine: https://web.archive.org/web/20171123111354/http://www.actsirius1.co.uk/. If you Click on Maintenance->Power Supply there's a list of the capacitors that commonly fail, their location on the board and some specs. Hope that helps!

Update: I may have spoken to soon. Is the Astec power supply on page 91 here: http://www.bitsavers.org/pdf/victor/victor9000/Victor_9000_Sirius_1_Options_Manual.pdf the right version?
 
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Mine was an Astec design that required a full recap. None of the values were overly hard to source (excluding the primary DC capacitors which I didn't have on hand but read okay for ESR) so I'd just do the whole supply at once.
 
NeXT said:
Mine was an Astec design that required a full recap. None of the values were overly hard to source (excluding the primary DC capacitors which I didn't have on hand but read okay for ESR) so I'd just do the whole supply at once.
Click to expand...
I had the compower, but also did the whole thing at once when a single cap blew. I didn't want to play whackamole.
 
pdevine said:
I haven't ever seen one. Several folks have been looking for the schematics for the other power supply. The only material I've seen on repairing it is in the wayback machine: https://web.archive.org/web/20171123111354/http://www.actsirius1.co.uk/. If you Click on Maintenance->Power Supply there's a list of the capacitors that commonly fail, their location on the board and some specs. Hope that helps!

Update: I may have spoken to soon. Is the Astec power supply on page 91 here: http://www.bitsavers.org/pdf/victor/victor9000/Victor_9000_Sirius_1_Options_Manual.pdf the right version?
Click to expand...
That looks like the one !

The PSU in my other Sirius doesn't have connectors for power other than that fed to the disk interface card, but this one has two extra ones for the hard drive and the Xebec card (which I almost got to test yesterday before the PSU failed) so I am assuming its required for the HD model.
 
Gary C said:
The PSU in my other Sirius doesn't have connectors for power other than that fed to the disk interface card, but this one has two extra ones for the hard drive and the Xebec card (which I almost got to test yesterday before the PSU failed) so I am assuming its required for the HD model.
Click to expand...
Yeah, they upgraded the power supply with the hard drive model. My understanding is the Astec unit has a higher wattage to support the extra load. The schematic doesn't have values for all the capacitors. But hopefully you can still read the values off the actual hardware on the board. If not, there's more astec manuals here: http://www.bitsavers.org/pdf/astec/. I believe the basic design is largely reused across the different models, so hopefully you'll be able to deduce what the right size would be.
 
Thanks, this is just what I needed to rebuild the Sirius PSU sitting on my desk from my hdd model.
I'd started reverse engineering the board, but this will make it easier, and I can add values where readable.
Have already done the RIFA caps, but one resistor has had the colour codes or writing burnt off & I'd like to replace them.

Anyone have a readable R3 ?
 
Ah thats an easy one.

R3 is 0.47 ohm

Or as its normally called ... a fuse. :)

Got a second victor today with the same PSU and this one has failed with a blown R3.

The original, is (was) crowbaring and with the zener out of circuit, the 5V was settling at 7.6V. Then I made a daft mistake and disconnected one of the voltage setting resistors (with the intention of reducing the value slightly and forgot to put the new one in) which must have made the circuit totally unstable as its now blown the fuse, Q1, Q2, R3 and possibly more :(
 
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Thanks, and R6, the one next to it.
Heat certainly alters the colors and values, so hard to replace with certainty.

I'll compile a parts list for these.
 
R6 is 120 ohm

and here are some pictures I took just incase I removed a component and couldn't remember where it went, hopefully you can see the colours but if you need any more, ask as I have three PSU's I can refer against (yes and none of them work :( )
 
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Might be these tired old eyes, but Z1 looks to read as 1N734, but that would be 68 volts, which wouldn't protect the 5v rail.
I might need to pull a few parts out to inspect more closely.
 
Thanks, that helps heaps.
The AA12090, used by Tandy, is very similar in design and has some useful testing info.
I'll check a few resistors out of circuit & replace C9, as it has been badly over heated and see if it works on my test load before attaching the boards.
 
I have ordered a LITEON PS-5221-9 which will fit in the case and can be got cheaper than a meanwell supply as a temporary stop gap.
 
Here is the first pass of a parts list.
Some parts are difficult to identify like the TM1&2, and I haven't removed diodes to accurately identify them yet.
I also found two board positions labeled R30 :oops:
The TO3 transistor looks like it has had the markings sanded off.
Looking at similar Astec designs, it might be something like the 2SC1358, but really needs to have the hfe measured.
 

Attachments

  • Victor_100750-02_PSU_Parts_List.txt
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I looked at the BU208, but the hfe of 2 is quite low when compared to the 2SC1358 at 10.
The Astec AA12090 (65W) is very similar in design, with the same three winding driver transformer using a 2SC1358.
 
Thanks for providing the PSU parts list, @mark0x01, I'm sure I'm going to need to refurb an Astec power supply at some stage. LMK if you'd like me to try and do any part investigation on a power supply I have. I might have components where the markings are more readable.
 
So, still not repaired any of the three PSU's I have to work on. The first is now flying back but crowbarring. I suspect I need to give it a load so its probably time I made up a loadbank for testing purposes.

In the mean time, I have installed a Liteon PSU PS-5221-9 as they are cheap and fit inside the original PSU case. Bit of soldering in a new loom, shorting out the power on line and drilling the new PSU case to match up with some holes in the original case and its now installed and working.
Can take the Sirius back to the museum now and clear the bench for the original PSU work.

s-l1600.jpg
 
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