[Info-vax] Used DS-10 or equivalent recommendations?

[Scott Dorsey]

John E. Malmberg <wb8tyw at qsl.net_work> wrote:
>On 10/7/2016 12:11 PM, Scott Dorsey wrote:
>> John E. Malmberg <wb8tyw at qsl.net_work> wrote:
>>> On 10/7/2016 9:06 AM, abrsvc wrote:
>>>> I would agree with Camiel on this.  The power supply is likely fried.
>>>> I have a spare available if you need one.  Contact me directly.
>>>> BTW:  Where are you located?
>>>
>>> I am located in Tolono, Illinois, near Champaign/Urbana.
>>>
>>> The fans and some LEDs turn on, is there a fuse for something else in
>>> the power supply to check?
>>
>> The power supply has multiple voltages.  Get the schematic, check them all.
>> It will crowbar individual rails too.
>
>I do not have a schematic and do not know what is needed for a dummy 
>load testing jig.

Download the schematic, and identify the outputs.

>My current test equipment is a low-cost VOM.

Use the VOM to determine what the voltages are at the outputs.  Given the
symptoms I'd assume the standby 5V is good but the 5V rail is not good but
this may not be the case.  Then put a 10uF or so capacitor in series with
the VOM and measure the AC voltages to get some sense of how much ripple is
on the rails.  

No need for a dummy load for the basic first test, just test it in-circuit.  
It'll be a lot easier to work on it on the bench with a load, but you'll 
only need to load the 5V rail down and you can use a car headlight for that.

But once you figure out which rails are dead, the scope will make your
life much easier since you can see the thing try to kick over.
--scott

-- 
"C'est un Nagra. C'est suisse, et tres, tres precis."