At 11:34 PM -0500 9/11/05, Rodger Boots wrote:
>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.
Yes, this you can do with an ohm-meter - save on fuses...a good
capacitor should show a low resistance, changing to a high resistance
over a number of seconds.
John :-#)#
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Sep 12 00:44:57 2005
This archive was generated by hypermail 2.1.8 : Mon Sep 12 2005 - 12:50:02 EDT