The 2 leads going to the CRT Socket are H and V Focus,I ass-ume.I think this is called Dual Focus,but I could be wrong. Anyway,does your monitor look fine when you turn it off and right back on(after the poor focus has appeared of course) ??? Peggs At 08:47 PM 12/10/02 EST, Mykeelike@xxxxxxx wrote: >In a message dated 12/10/02 2:04:36 PM Pacific Standard Time, >peggs@xxxxxxxxxxxxxx writes: > >> >> model GDM-F500 >> chassis SCC-L03C-A >> Nov. 1998 >> 'Flat Tube' #M50LPU15X >> This thing has Focus that will Drift very Intermittently. >> It may play for days without drifting. >> It has a seperate Focus 'Divider',which looks like >> just a small version of a Flyback. It has one Lead in >> from the Flyback,and 2 leads out to the Pix Tube Socket. >> The input has 10Kv and each output has app. 5Kv,both >> when the Focus is good and when it's bad. >> Some of the Plugs on the CRT PCB are marked with voltages,all >> of which appear to be fine. >> Are these Tubes known to go bad with poor focus ??? >> I'm going to pull the CRT Socket to have a look at it >> >> Peggs >> Peggs' Electronics >> 1519 West 2nd Street >> Owensboro,KY 42301 >> 270-926-4968 >> fax 270-686-7399 >> > >i have the same model Sony in my shop with the exact same problem.the monitor >came in dead . i changed the CXA2043. monitor looks good but has this focus >problem. i have determined that the focus voltage does not change but there >are two sets of focus voltages at which the tube focuses at. i know this >monitor has a dynamic focus that is probably accessible in das however when >i look at the waveform and voltages into the focus block they do not seem to >change when the tube decides to switch int its secondary focus mode. this >problem is not caused by the cxa IC. i am suspecting the CRT. i believe Sony >has the answer but i have not been able to get through to them. if you find >out what this is please let me know. > >Mike Wilson >a.m. stereo & video >Seattle WA >206 364 5904 > > >------------------------------------------ >Submit A Repair Tip For Everyone Here: >http://www.tech-assist.org/secure/tip/main.html >------------------------------------------ >To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html >To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > > Peggs' Electronics 1519 West 2nd Street Owensboro,KY 42301 270-926-4968 fax 270-686-7399 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html