开云体育

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

I was using my 2445 today when I heard a strange sort of thump noise coming from inside the scope after which I startettd 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

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

From: "tom jobe" <tomjobe@...>
To: [email protected]
Sent: Saturday, August 3, 2019 7:29:21 PM
Subject: Re: [TekScopes] 2445 LVPS Issues

If you are talking about the black cover over the two largest
capacitors, there is a prong that goes down in the middle between the
two bumps, the prong has a hook on one side of it that latches the cover
in place. You deflect the prong to the side a little bit and the cover
comes off in your hand. Maybe wait until you have the power supply out
on the bench before trying to remove the black cover?
Those two large capacitors never seem to give any trouble in a 24x5 but
have a look anyway and check the ESR if it is easy for you to do.
Replace all of the smaller caps regardless of how they look or the ESR
checks out. I see you have been warned about the schematic errors on two
of the capacitors, don't miss this problem.
There is excellent help available here on Tekscopes for the 24x5 scope
family.


On 8/3/2019 4:13 PM, 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 startettd 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

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

I was under the impression that the black cover would not allow the boards to be removed beforehand but if that's the case, then okay. I see to recall removing that before on perhaps a different scope but just didn't see how to get it out this time.

I'll check the ESR on the big caps as well. Good to know that those may not need replacing. As I said, I'm pretty sure I see bulging on several of the smaller caps on the regulator(?) board so will plan to replace all of them.

Thanks,
Barry - N4BUQ

This project of mine might provide some useful info.

AB

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

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

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

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

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

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

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

If you can do it, perhaps gripping the fan motor shaft with a big pliers and wobbling the blade may help. Wobble it back and forth numerous times but never with much force.
I have a problem with the main tuning knob on my TS-940S. I can't undo the set screw. It seems to be bunged up and so far nothing has budged it. Luckily I have no need to remove it but still...
Bob
On Sunday, August 4, 2019, 09:14:38 PM PDT, n4buq <n4buq@...> wrote:

The fan was working - at least I'm pretty sure it was. Something in the PS began to smell of smoke so I'm pulling it to perform needed repair and maintenance work (mostly capacitor replacements).

Thanks,
Barry - N4BUQ

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

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

From: "Chuck Harris" <cfharris@...>
To: [email protected]
Sent: Monday, August 5, 2019 8:25:19 AM
Subject: Re: [TekScopes] 2445 LVPS Issues

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:

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

The fan was working - at least I'm pretty sure it was. Something in the
PS began to smell of smoke so I'm pulling it to perform needed repair and
maintenance work (mostly capacitor replacements).

Thanks,
Barry - N4BUQ

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

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

From: "Barry" <n4buq@...>
To: [email protected]
Sent: Monday, August 5, 2019 9:12:01 AM
Subject: Re: [TekScopes] 2445 LVPS Issues

Okay, Chuck. I presumed it was a collet but wasn't sure how to release it.
Unfortunately, I did turn the screw some in a CCW direction and then back
again so it sounds like I may have damaged the collet. Ugh! Too tempting
and the manual doesn't give any caveats regarding that (only states not to
remove the nut which I can't really see what that would hurt either but,
perhaps, because it might bind on the slotted burrs and cause the screw to
turn). If I can get the impeller off, I'll see what kind of damage I may
have caused. The impellers are still available but I'm guessing the collet
isn't.

Thanks again,
Barry - N4BUQ

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

From: "Chuck Harris" <cfharris@...>
To: [email protected]
Sent: Monday, August 5, 2019 8:25:19 AM
Subject: Re: [TekScopes] 2445 LVPS Issues

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:

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