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Type: Posts; User: paul

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  1. Replies
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    Looks like you've found the problem. Do you...

    Looks like you've found the problem.

    Do you have a schematic?
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    I see now it's a clone, not a original 5160 unit.

    I see now it's a clone, not a original 5160 unit.
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    There should be a inrush limiting power resistor...

    There should be a inrush limiting power resistor and bypass relay somewhere, must be on the incoming power PCB. An issue there might be why it's popping fuses, assuming the fuse capacity and type is...
  4. As do many power supplies in other very expensive...

    As do many power supplies in other very expensive workstations. They are purchased by the systems integrator at the lowest cost the market can provide, and replaced in the field as a unit, not...
  5. I'm not seeing anything that suggests that PS is...

    I'm not seeing anything that suggests that PS is as bad as you describe. Remove the PCB and replace the EMI X and Y caps at the front end and the DC smoothing caps at the output.
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    Well, that looks nothing like the 120VAC version...

    Well, that looks nothing like the 120VAC version but no-doubt an equally effective design. I don't think a 230VAC schematic exists so that's handy for some here and good work on your part.
  7. Video 7 MGA+ perhaps? 1986, $165

    Video 7 MGA+ perhaps? 1986, $165
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    Poll: I have a 9000/735 and SUN Ultra1, IPC and...

    I have a 9000/735 and SUN Ultra1, IPC and SparcClassic. The SUNs are consistently well designed and of very good quality. This particular HP is of the older design that are expensively constructed,...
  9. Yes, the same mid-rail is employed in the 63.5W...

    Yes, the same mid-rail is employed in the 63.5W 120VAC 5150 PS. When I converted mine to 230VAC I did not know that this point in the circuit would remain stable so used the 325V rail with a suitable...
  10. Almost certainly across the X2 filter capacitor...

    Almost certainly across the X2 filter capacitor on the EMI board. It just keeps you from getting a bite from the plug pins when you disconnect from the mains.
  11. ... 5150 I mean ...

    ... 5150 I mean ...
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    It's not a bad idea to build up a knowledge base...

    It's not a bad idea to build up a knowledge base as hardware deteriorates, SUN and SGI in particular.
  13. thanks all ...

    Just a shout out to yourself and others here who got me interested in getting this working on my 5050. It all works perfectly and I was able to demonstrate that both the full height and low profile...
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    5153 convergence and sharpness

    I've seen some sharp CGA images on these forums now and again while my 5153 doesn't look so good. I've tried adjusting the convergence and screen focus as best as I can, but I can see they need more...
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    Just to update this old but still-relevant...

    Just to update this old but still-relevant thread, I've had this same issue on an intermittent basis for a few years now, only on a cold start. Once it's been running it will restart normally even...
  16. OK, thanks. I managed to get it to boot off the...

    OK, thanks. I managed to get it to boot off the HD by overwriting the System 6.0.5 file with a 6.0.4 version I found on a floppy. It's good enough for now and gives me time to track down the...
  17. Mac Plus, error after installing 6.05 on HD, "System file may be damaged"

    The Mac Plus in my collection has 4MB ram and a recently-added external SCSI drive, a 170 MB Connor I think, non-"Apple" in any case. It had System 7 on it which had some issues booting with...
  18. I just think about something and a relevant video...

    I just think about something and a relevant video appears on my YouTube "recommended" list. No idea how they do it.
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    I had a similar looking minibike in 1971 called...

    I had a similar looking minibike in 1971 called "Cat 400" or some such but it didn't have the gas tank. The rear sprocket (which doubled as the disk brake) was almost as large as the rear tire so...
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    I also used automotive high-pressure fuel hose to...

    I also used automotive high-pressure fuel hose to refurbish the roller on an Archive 2150S I acquired recently. Fortunately the belt was still good.
    To cut the rubber tube to length I pushed a...
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    That is not applicable to these classes of caps.

    That is not applicable to these classes of caps.
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    Yes, removing jumper M5 changes the bridge to...

    Yes, removing jumper M5 changes the bridge to full wave across the main smoothing caps C7, C8, suitable for 230VAC.But, also check the voltage ratings on all caps across the AC, or AC to ground...
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    If you post the schematic I can look at it for...

    If you post the schematic I can look at it for you.
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    I have the same setup and have it set for drive...

    I have the same setup and have it set for drive type 8.
  25. Here: https://www.alliedelec.com/

    Here: https://www.alliedelec.com/
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