Christopher X. Candreva wrote:
>On Sat, 10 Sep 2005, John Robertson wrote:
>
>
>
>>Start with power...is the board getting good +5VDC? Often a blue screen is
>>simply a failed power supply. You can wire in a switching supply to replace
>>the failed linear. I use old computer supplies - they have LOTS of +5 current!
>>
>>
>
>It's definately power. It's blowing F3 on the main transformer block. (32v
>25 amp on the block, 20amp on the schematic).
>
>The faston connector on the outbound of that fuse was melted, end of the
>wire jacket blackened, and the wire itself has green corosion as far as I
>stripped (about an inch). I cleaned up the end of the wire and crimped on a
>new connector. Since both ARII's are as clean as I've ever seen one (no
>chared componants, no old char marks, caps good), and the board contacts
>were good, I thought the wire itseld may have been the cause.
>
>No dice. Promptly blew the same fuse. Turned out to be my only 25amp fuse
>(slow or other blow). Crap Shack now only carries up to 10v fast, 8amp slow,
>if anyone cares.
>
>Once I had a supply of fuses I suppose I would disconnect both ARII's, see
>if it blows, then see which one does it. Now to find fuses.
>
>
Unplug ARs and see if rectifiers under chassis or big blue is shorted.
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Received on Mon Sep 12 00:34:23 2005
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