Cap reformation question

[J.C. Wren]

    I've powered up the SOL-20 and nothing smoked :) 

    First, I pulled the 17,000uf and 54,000uf electrolytic cans, and 
worked them up to 15V through a 10K resistor.  I later stepped this down 
to 1K.  I let each cap "cook" for about 48 hours.  I did this while I 
was waiting for an ESR meter I ordered to come in. <URL: 
http://clientes.netvisao.pt/greenpal/evb1.htm >  The meter arrived 
today, and I checked the two big caps and the two 2500uf caps on the 
power supply board.  They were right in spec. 

    I then reinstalled the caps and disconnected the supply from the 
motherboard and the riser card, then powered it up through a variac.  
The supplies looked good, so I plugged them into the motherboard and 
riser, attached a monitor (which I first had to get working...) and it 
sorta came up. 

    I appear to have a bad 2102L in the video memory.  Bit 0 was always 
on, and the problem followed moving the chip.  The keyboard is dead, 
except for the LEDs.  The next post has a question about that.

    --jc

Doc Shipley wrote:

> Allison wrote:
>
>>>>
>>>> S100 linear supplies are unregulated (usually) before they get on 
>>>> the bus
>>>> so a load is NOT needed.  Do insure the caps are discharged before 
>>>> inserting
>>>> any board.
>>>>
>>>> Allison
>>>
>>
>>
>>
>> Anything under a 20W appliance bulb initially.  The lower the wattage 
>> the higher will be the initial resistance and lower peak current.
>
>
>   I'm ready to begin the power-up process with this Cromemco Z-2D.  
> The cards all look good, the backplane and cabling all look intact, 
> and the PSU itself looks clean and shows no scorching or other 
> damage.  Oh, and I've cobbled up a power cable for it.  ;)
>
>   I understand the principle of using a light as a current limiter, 
> but I have one question - say I start with a 7.5W bulb, how long 
> should I run the PSU at that level, and should I then step up through 
> 20W, 40W, etc?  If so, I have bulbs up to 200W; where should I stop?
>
>
>     Doc