On Wed, 12 Oct 2005 09:38:54 -0400, T o d d P a t t i s t
put finger to keyboard and composed:

"Mark D. Zacharias" wrote:

Sounds like you either missed the vertical boost cap, usually about 100uF at
35V, near the vertical output IC,

There were two of these - both replaced. One on pin 8
(second B+) and one on pin 9 (Pump Up Output).

or else a B+ filter near the flyback,
something like 4.7uF at 160V or 10uF at 160V, etc. If it's the boost cap,
the vertical output IC will be running hot.

If you suspect this, where would you put the scope to verify
(as long as I've got it out and hooked up?)

Here's a photo of the current LA7838 output.

http://delpet.com/images/LA7838Output.jpg

What voltage are you measuring on pin 13? Is it significantly higher
than pin 8? If not, then you will be running out of headroom. I'd
replace D4E2 just in case. A 1N4007 should be OK. I'm also curious as
to where the LH trace at pin 9 goes.

-- Franc Zabkar

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