[Color Computer] Re: [Coco] as the cm-8 turns ...

[Gene Heskett]

On Saturday 10 April 2004 18:33, Neil Morrison wrote:
>----- Original Message -----
>From: "Kevin Diggs" <kevdig at hypersurf.com>
>
>> Hi,
>
>...
>
>> How do I tell if the deflection coils of my cm-8 are bad? Would
>> the
>
>dc
>
>> resistance tell this? Anyone know where to get the correct value?
>> I
>
>have
>
>> the dc voltage of one side of the coil but not the other (from the
>
>service
>
>> manual, value is correct)....
>
>The ideal method is to use a flyback/yoke checker
>(http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3088910524)
>or you have to try other methods. Basically, you can apply a square
>wave, say, to the coil with a capacitor in parallel and look at the
>waveform on an oscilloscope. You do need some experience to 'read'
>the results. If you have access to an inductance checker you can use
>that also.
>
>None of these methods probably help you much, since most folk don't
>have these things. I'd be inclined to ask your local Radio Shack
>repair centre or any local computer monitor or tv repair shop to
>check the thing out for you. They may well have the right equipment.
>
>Neil
>
Unless the deflection coils have been handled with really dirty hands, 
gotten wet somehow, or been handled by a woman having her period 
(even when her hands are "clean", the skin acids are different, and 
bad for wires), the chances of the yoke being bad are fairly low.

Unforch, I can't say the same of the scan transformer.  It doesn't 
need an excuse to fail, but often will appear to have failed falsely 
because the solder joints on the bottom it it have cracked, thereby 
breaking a connection.  Use a magnifying glass and a goodly amount of 
light, those cracks can be hard to see.  Fresh solder, applied by 
someone familiar with which end of a soldering iron gets hot would be 
in order in that case.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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Yahoo.com attornies please note, additions to this message
by Gene Heskett are:
Copyright 2004 by Maurice Eugene Heskett, all rights reserved.


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