Re: Pole Position displays just a blue screen ?

John Robertson wrote:

> 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 :-#)#

And the fuse holder that had the overheated wire HAS to be replaced. It
is now scrap. Once overheated they won't make a good connection which
will cause LOTS of heat that will blow more fuses (though not
quickly---that would be a short somewhere).

If you look inside the chassis you will probably find a bridge rectifier
that has shorted and quite possibly some more burnt wiring connected to
it. If you replace any wiring use at least 12 gauge, 10 is better.
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Received on Mon Sep 12 04:25:00 2005