NAP 41JP20 fixed

[James Sweet]

Thanks to help from this group I finally got this 41JP20 which I picked up
for free finished. Took a while since it's out at my mom's and I could only
tinker with it when I had time to go out there.

Initially the set was dead, replaced HOT, chopper in the power supply and
the fuse, got it up and running

CRT coolant was contaminated, removed, cleaned out and refilled all three
CRT assemblies, tweaked convergence a bit, was working reasonably well

Flyback blew up, set is again dead

Replaced FBT with HR Diemen replacement, set worked briefly and then begin
shutting down

Tweaked HV shutdown pot, adjusted B+ and HV to spec

That restored operation, then finally tonight I went through the service
sheet that came in a pouch on the back of the set (why can't every set have
that?) and adjusted optical and electrical focus, color ballance, gray
scale, black level, geometry and a full convergence alignment. Despite the
old age of the set the picture looks fantastic, it's bright and reasonably
sharp with good color. I'm sure it'll get several more years of use.

 

[Ol' Duffer]

That restored operation, then finally tonight I went through the service
sheet that came in a pouch on the back of the set (why can't every set have
that?)

Believe it or not, most customers find this annoying and throw
it away, along with the user's manual. It is rare for a set
to come in for service with the pouch still attached. Makers
would have to hide it inside for it to be [relatively] safe.

 

[techforce]

I thought one day we would see a Floppy disk or a CD in there. Guess some of
my ideas are too ahead of the times )


| In article <Cpb0d.24130$x12.4502@trnddc05>, [email protected]
| says...
| > That restored operation, then finally tonight I went through the service
| > sheet that came in a pouch on the back of the set (why can't every set
have
| > that?)
|
| Believe it or not, most customers find this annoying and throw
| it away, along with the user's manual. It is rare for a set
| to come in for service with the pouch still attached. Makers
| would have to hide it inside for it to be [relatively] safe.

 

[Bill]

I thought one day we would see a Floppy disk or a CD in there.
Guess some of my ideas are too ahead of the times )

The way the soft-heads do things, it would probably be a
LAN port you'd connect to your laptop and use your web
browser to download the service manual from the set.
Of course it would be encrypted and protected by pass-
words that the factory would forget within 6 months of
building it. And it would be a weird file format that
would force you to buy special software from the maker,
which would cost at least $500. And of course you would
have to get the set to work first...