[TechAssist] SK alert

Maybe we should run an SK warning about once a month for those that don't
know.SK high power devices are ALL a time bomb.I threw all mine out,and I
got em from a defunct shop,for free! al

Al Leatherman
224 Rt. 46
Mine Hill, NJ. 07803
973-361-5796
WWW.ALS-TV.NET

----- Original Message -----
From: "Shoreline Electronics" <jstielau@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 31, 2003 3:12 PM
Subject: [TechAssist] Re: Sony CTV KV27EXR20 (Chassis ANU-2) H. O. T. Shorts
after 20 Minutes.


> Oh god!  No SK's....that IS your problem!
>
> Not sure on the sub...just stay away from SK outputs and vertical amp IC's
>
> ==========================
> Jeff Stielau
> Shoreline Electronics Repair
> 344 East Main Street
> Clinton,CT 06413
> 860-399-1861
> 860-664-3535 (fax)
> jstielau@xxxxxxxx
> ==========================
> "If you push something hard enough it will fall over."
> Fudd's First Law of Opposition - Sir Sidney Fudd
>
>
> ----- Original Message -----
> From: <HarrisTV50010@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, May 31, 2003 5:43 PM
> Subject: [TechAssist] Sony CTV KV27EXR20 (Chassis ANU-2) H. O. T. Shorts
> after 20 Minutes.
>
>
> > I have a Sony Model KV27EXR20 Chassis ANU-2. The first time this set was
> in
> > the shop it had a bad STRS6301 Regulator IC but the H. O. T. Was Ok. I
> checked
> > and resoldered any questionable connections. The customer had the unit
> home
> > about 2-weeks and it died again.
> > This time the 2SD1886 H. O. T. had shorted. I checked the horizontal
> circuit
> > using our Sencore TVA62 and everything checked ok. I replaced the H. O.
T.
> and
> > it ran for 20 minutes and shorted again.
> >
> > This time I thoroughly rechecked the regulator circuit using a resistor
> load
> > and everything checked perfectly. I thoroughly went over the chassis for
> any
> > questionable connections. I resoldered everything is the base drive &
> collector
> > circuits of the H. O. T. I replaced the 2SD1886 again. I monitored the
> base
> > drive and the collector waveform using our X100 scope probe. Everything
> looked
> > textbook perfect. The Collector pulse width was 14us, which is normal. I
> did
> > start monitoring the temperature of the H. O. T. Using an Infrared
> Thermometer.
> > The temperature started rising and the transistor shorted at about 165
> > degrees.
> >
> > Does anyone have any ideas what might be causing problems? I am using
RCA
> SK
> > 2SD1886 which I haven't had any problems in the past. I checked
> RepairWorld
> > and someone had used a 2SC4729 as a replacement. Do I need to try an
exact
> Sony
> > replacement? Any thought would be greatly appreciated.
> >
> > TIA,
> > Dale
> >
> > Dale A. Lubow... HarrisTV50010@xxxxxxx ..515-232-1109..(Fax)515-232-3356
> > Harris TV & Appliance..........335 Lincoln
> > Way.....Ames.....Iowa.....50010-3384
> >
> >
> >
>
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