开云体育

From: "Tony Fleming" <czecht@...>
To: [email protected]
Sent: Sunday, August 4, 2019 10:17:23 PM
Subject: Re: [TekScopes] 2445 LVPS Issues

I did not remove mine, when fixing mine. It was little dusty so I used a
brush. It works, so I don't fix what isn't broken.... ha ha ha
BUT my memory isn't that good to remember if it is glued or some set-screw
- sorry.
Is your fan working?

On Sun, Aug 4, 2019 at 9:32 PM n4buq <n4buq@...> wrote:

I've already pulled on it harder than I was really comfortable doing;
however, the instructions state to use "firm pressure" to pull the fan
blade off.

I'm wondering if the slotted screw is intended to be used to push against
the motor shaft and push the fan blade off. If that were the case, though,
I'd think that would be in the instructions so I'm thinking that's not a
proper approach.

Thanks,
Barry - N4BUQ

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

From: "Tony Fleming" <czecht@...>
To: [email protected]
Sent: Sunday, August 4, 2019 7:44:33 PM
Subject: Re: [TekScopes] 2445 LVPS Issues

They are VERY FRAGILE! Do not apply much pressure or it just brakes.
I don't know how to remove it without braking it, sorry!

On Sun, Aug 4, 2019 at 7:13 PM n4buq <n4buq@...> wrote:

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