开云体育

From: "n4buq" <n4buq@...>
To: [email protected]
Sent: Saturday, August 3, 2019 9:03:44 PM
Subject: Re: [TekScopes] 2445 LVPS Issues

I didn't realize the SM would go into detail on board removal. I will read
up on it there.

Thanks for the tip on the incorrect silkscreen too.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Tom Gardner" <tggzzz@...>
To: [email protected]
Sent: Saturday, August 3, 2019 7:10:03 PM
Subject: Re: [TekScopes] 2445 LVPS Issues

The service manual is quite specific on how to remove the various boards.
It
isn't difficult, if follow instructions.

The manual is available at the usual places, e.g. tekwiki.

Be aware that on some of the 24x5* series the manual and silk screen show
two
caps swapped. So when recapping, remove and replace a single capacitor
before
moving on to the next; don't remove them all and then start replacing them.


On 04/08/19 00:13, n4buq wrote:

I was using my 2445 today when I heard a strange sort of thump noise
coming
from inside the scope after which I started smelling a burning odor. I
had a few pieces of gear powered up at the time but quickly could tell
the
smell was coming from the 2445.

I took off the case and top cover and pretty sure the smell is coming
from
the LVPS board(s) but am a bit stumped at how to get those two boards
out.
I'm pretty sure the top ribbon cable needs to come off but don't quite
see how to get the large plastic cover off of the area where the main
filter caps are.

Looking at some of the smaller caps, they appear to be leaning due to
(I'm
guessing) bulging at the circuit board end but not sure exactly what
overheated (or, possibly, made that thumping noise).

Are there instructions somewhere that outline how to remove those boards?
If not, could someone provide a couple of hints to get me started?

Thanks,
Barry - N4BUQ