"John Del" wrote in message
...
Subject: Rewinding pc coil for 9-1270 Zenith boards ?? anyone know
inductance? 9-1270-02 9-1270-3 mod# SR3587
From: "Dave Moore"

Now with the coil reworked, it still shuts down on
some really bright scenes, but it has a very much
obvious improvement in tolerance. In fact it might
run for 15 minutes or more.
one.

Oh, one thing I forgot to mention was,
I replaced the Flyback origionally. I ordered the
part from http://www.slelectronics.net/fl.zenith.htm#


Dave, the problem is your replacement generic flyback. Every one I tried
did
this, sometimes shutting down as soon as the CRT lit. Basically, one of
the
secondary sources off the flyback is too high, I don't remember which one.
You
need to fudge this voltage with a dropping resistor, or fudge the shutdown
circuit. The board is actually marked and cut for a shutdown pot that was
never used. It's near the front of the board (away from the flyback).
You'll
need a schematic to locate this, but it's an easy mod that will allow the
replacement flys to work properly. BTW, those coils run really hot even
when
everything is normal.

John Del
Wolcott, CT


Ah, thanks John, I really appreciate the info you gave me,
really took a load off my mind,,, this bugger's really been
eatin da' icing off me cake.

I kinda thought that something like that might be
the case, and is the reason I've been trying to get a schematic.
Ron gave me 3 alternative Models that use this board and Zenith
doesn't have a single one of the schematics for any of them!

You just may have saved me $20 as I was about to pay that much
more for a service manual from http://www.servicemanuals.net/service.asp

Now I can probably knock this one out now and just order the
$13 manual from Zenith for myself and suffer the backorder wait.
I'm willing to wait a month,
but my friend with the tv probably wouldn't. Come to think of it,
I guess you saved him $20 since I woulda just passed the charges
on to him anyway.

I'm pretty sure I can find the unused pot and rig something.

Thanks again
=^^=DM





"Nothing is so opportune for tyrants as a people tired of its liberty."
Alan Keyes

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