It is easy:
Put a screwdriver in the slot of the screw, and use a wrench to
turn the nut against the screw (DON't LET THE SCREW TURN!!!)
Back off the nut until it is flush with the slot, and give the
nut a light tap with a hammer. It will move into the squirrel
cage a little bit, and then the squirrel cage can be pulled off.
If you let the screw turn relative to the squirrel cage, it will
destroy the delicate plastic collet... you don't want to do that!
-Chuck Harris
n4buq wrote:
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Got everything removed except the fan. Any hints/tricks to getting that off? Loosened the nut but the fan blade won't budge and I don't want to pull any harder unless it is recommended. I have a feeling that's some kind of collet and perhaps pressure on the slotted screw would release it but just don't know.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Barry" <n4buq@...>
To: [email protected]
Sent: Saturday, August 3, 2019 9:30:54 PM
Subject: Re: [TekScopes] 2445 LVPS Issues
And there, on page 6-25, is the complete process spelled out very neatly.
Just didn't expect that.
Thanks,
Barry - N4BUQ
----- Original Message -----
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
