[TechAssist] Re: RCA PTK 195 blows horizontal output
- From: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 28 Apr 2004 14:51:14 -0400
Well, here we are back at this dog again. It lasted a couple months in the
customers home, and it is back to its old tricks again.
It blows the Horizontal output transistor after a short time. This time, I
had the Sencore HA2500 hanging on it, using it to monitor the drive to the
base. The drive was varying between 5.7 - 6.0 V P-P for about 3 minutes,
then the transistor shorted.
I've ruled out the splitter, the IHVT(by replacement), and the Hor. Drive
transformer (by replacement). The B+ in run mode is 142V.
The transistors are 2SC5148 from B & D. So, does anyone have any words of
wisdom for me?
John Myers
Myers TV Service Since 1984
Alliance, OH
ph 330-821-6545
----- Original Message -----
From: <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 19, 2004 5:32 PM
Subject: [TechAssist] Re: RCA PTK 195 blows horizontal output
> John,
> check the value of R14305 3.6K ohm 3 watt volt supply to horizontal
driver
> and resolder horizontal drive transformer T14301
>
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
> Dallas, TX
> ----- Original Message -----
> From: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, February 19, 2004 2:12 PM
> Subject: [TechAssist] RCA PTK 195 blows horizontal output
>
>
> > Hello,
> > Here's my latest dog. An RCA chassis (M#P52927 / ch# PTK195M26B)
> >
> > It blows the Horizontal output transistor after about 2 seconds.
> >
> > I've ruled out the splitter; Changed the flyback, and the horizontal
> output transistor (used original RCA parts on both). Double checked that I
> had the right transformer for the chassis.
> >
> > With the transistor out, I measured 169V at the collector terminal, in
> standby mode. The horizontal output circuit tests OK on my horizontal
> analyzer.
> >
> > Any ideas?
> >
> > John Myers
> > Myers TV Service Since 1984
> > Alliance, OH
> > For Professional Technicians ONLY
> > ph 330-821-6545
> >
>
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