[TechAssist] Re: ATC311 Sweep board component level repair.
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, Tech Assist <techassist@xxxxxxxxxxxxx>
- Date: Wed, 05 Nov 2003 12:23:07 -0800
Isn't the convergence 'stored' in an EEprom ???
Maybe it got zapped on the original/component repair module
Peggs
At 09:51 AM 11/5/03, walter wood wrote:
>Jason at Excel was kind enough to provide some
>extra input on the HV splitter issue in the ATC311
>thomson chassis.
>Reference Thomson bulletin TV-03005.
>I've had 8 of these things and on 5 of them
>replacing the splitter and R14705 238958 27k common
>1/2 watt resistor repaired the sets.
>When the power/sweep board is replaced(according to
>Thomson tech support), the geometry and convergence
>must be set.
>That's a bear, as I still don't have the adaptor
>for Chipper Check to do this.
>So, I tried the component level fix.
>The extra parts are:
>R14718 260880 120K 1/4 watt
>R14718 175046 30K 1/4 watt
>CR14703 198589 diode
>Q14401 243834 2sc5522 transistor.
>On this particular set R14718 and Q14401 were the
>only other failed components. I did replace all six
>however.
>
>This repaired the set, BUT, the convergence is off
>exactly as the complete module I replaced.
>I've done both,module and component repair on this
>set in order to answer some questions, but I only
>got more questions.
>Apparently, it's not the changing of the
>power/sweep/back end processor, that causes the
>convergence problem.
>So, the splitter's arcing must damage another
>board.
>Any ideas??
>TIA
>Walter
>
>=====
>Walter Wood
>Future Tech Home Center
>2786 Hwy. 43 N.
>Lawrenceburg Tn. 38464
>931-829-3337
>Fax 931-829-4044
>mailto:wwood_38478@xxxxxxxxx
>
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