|
hello , have a nice working spectrum 8558b with electron beam memory? , all is correct have checked , but the issue the time division switch does not work , in auto mode, , opened it and found a missing part in the switch , from the service manual sent with this spectrum analyser from new only 40 years ago part number is 5061-5425 pronger switch , it is the metal leaf part which is missing , checked and did not find it anywhere , so question is does anyone have or make these ? thanks
|
This is a really common problem. Generally, the contacts fall off somewhere inside
the unit, but they may go missing. You can fabricate some from suitable shim stock.
Here's one person who did that:
It's a bit of a ways down. I'm not sure what the original material was (stainless? a
nickel alloy?) but given the age of the equipment and the use it will likely get, I don't
think it would matter a lot. I think some have made up contacts from a piece of stainless
steel feeler gauges (like you would use in auto repair).
good luck
toggle quoted message
Show quoted text
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros wrote: hello , have a nice working spectrum 8558b with electron beam memory? , all is correct have checked , but the issue the time division switch does not work , in auto mode, , opened it and found a missing part in the switch , from the service manual sent with this spectrum analyser from new only 40 years ago part number is 5061-5425 pronger switch , it is the metal leaf part which is missing , checked and did not find it anywhere , so question is does anyone have or make these ? thanks
!DSPAM:5d6ee55b212076544458839!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows
|
Hi John,
? ?Some time ago (2 years or more?) I repaired one of these contact fingers *in-situ*, without taking the instrument apart.? I posted pictures in one of the photo albums.? Look back through the messages with my name in them.? You might get lucky if you find the finger and can manipulate it well enough to epoxy it back into place.
Dan
On Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul Amaranth <paul@...> wrote:
This is a really common problem.? Generally, the contacts fall off somewhere inside
the unit, but they may go missing.? You can fabricate some from suitable shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the original material was (stainless? a
nickel alloy?) but given the age of the equipment and the use it will likely get, I don't
think it would matter a lot.? I think some have made up contacts from a piece of stainless
steel feeler gauges (like you would use in auto repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros wrote: > hello , have a nice working spectrum 8558b with electron beam memory? , all is correct have checked , but the issue the time division switch does not work , in auto mode, , opened it and found a missing part in the switch , from the service manual sent with this spectrum analyser from new only 40 years ago part number is 5061-5425 pronger switch , it is the metal leaf part which is missing , checked and did not find it anywhere , so question is does anyone have or make these ? thanks > > > > > > !DSPAM:5d6ee55b212076544458839! -- Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI, USA Aurora Group of Michigan, LLC? |? Security, Systems & Software paul@...? ? ? ? ? ? ? |? Unix & Windows? ? ? ? ? ? ?
|
Hello Dan,
?
Thanks for keeping Paul’s description of his repair work.
?
And Paul, Great job. Clearly, you have the patience of a saint.
I get you on the skills transfer from motor vehicle repairs to HP switches –
when I did my elec eng degree, I was the ‘go-to’ guy for motor vehicle power
train repairs.
?
This evening, I have a friend’s HP-8640B coming to me for
servicing, and I suspect some of the switch fingers will be missing. When I get
that far into the diagnosis, I’ll be looking for help.
?
73 de Brian, VK2GCE.
?
On Wednesday, 4
September 2019 10:39 AM, Dan said:
?
?
?Some time ago (2 years or more?) I repaired one of these contact fingers
*in-situ*, without taking the instrument apart.? I posted pictures in one
of the photo albums.? Look back through the messages with my name in
them.? You might get lucky if you find the finger and can manipulate it
well enough to epoxy it back into place.
On Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul Amaranth
<paul@...> wrote:
This is a really common
problem.? Generally, the contacts fall off somewhere inside
the unit, but they may go missing.? You can fabricate some from suitable
shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the original material was
(stainless? a
nickel alloy?) but given the age of the equipment and the use it will likely get,
I don't
think it would matter a lot.? I think some have made up contacts from a
piece of stainless
steel feeler gauges (like you would use in auto repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros wrote:
> hello , have a nice working spectrum 8558b with electron beam memory?
, all is correct have checked , but the issue the time division switch does not
work , in auto mode, , opened it and found a missing part in the switch , from
the service manual sent with this spectrum analyser from new only 40 years ago
part number is 5061-5425 pronger switch , it is the metal leaf part which is
missing , checked and did not find it anywhere , so question is does anyone
have or make these ? thanks
>
>
>
>
>
> !DSPAM:5d6ee55b212076544458839!
--
Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI,
USA
Aurora Group of Michigan, LLC? |? Security, Systems & Software
paul@...? ? ?
? ? ? ? |? Unix & Windows? ? ?
? ? ? ?
|
Yes that is exactly the issue after time they fall out and get lost. If found they can be epoxied back in. Then be careful using the switch. You can also home brew a new leaf. Its very hard to do. Of course you also don't have the right finger material. But I have a number of working units and all seemed to have lost one or another of these switch fingers. I was lucky in that they were typically in the unit some place. Good luck and its worth the effort to home brew if you have to. Regards Paul WB8TSL
|
Exact replacement finger stock in strip form: Tech Etch part number 75RE
https://www.tech-etch.com
The problem is obtaining it in small quantities.? They only normally stock it in the the Beryllium copper material.? Stainless steel is a special order. Greg
|
Thanks ,
I did have the feeling that issu was comon looking at the plastic
studs ment to hold the leaf , I have about a meter of thin
screaning shield made of phosphore bronze coming from big Cisco
7000 I kept knowing how usefull it may become , however I don't
have the profile , dimensions , of the original part , and don't
want to bust the gold contacts with a wrong design....
thanks again
John
Le 04/09/2019 à 05:03, paul swedberg a
écrit?:
toggle quoted message
Show quoted text
Yes that is exactly the
issue after time they fall out and get lost.
If found they can be
epoxied back in. Then be careful using the switch. You can
also home brew a new leaf. Its very hard to do. Of course you
also don't have the right finger material.
But I have a number of
working units and all seemed to have lost one or another of
these switch fingers. I was lucky in that they were typically
in the unit some place.
Good luck and its worth
the effort to home brew if you have to.
Regards
Paul
WB8TSL
|
Thanks ,
have searched for a long time in the analyser , with no finding ,
went back to the old lab where we with died stepfather worked ,
but many years and probably vaccum clean as been passed, so
definitevely lost...
Thanks again John
Le 04/09/2019 à 03:59, Brian a écrit?:
toggle quoted message
Show quoted text
Hello
Dan,
?
Thanks
for keeping Paul’s description of his repair work.
?
And
Paul, Great job. Clearly, you have the patience of a saint.
I get you on the skills transfer from motor vehicle repairs
to HP switches –
when I did my elec eng degree, I was the ‘go-to’ guy for
motor vehicle power
train repairs.
?
This
evening, I have a friend’s HP-8640B coming to me for
servicing, and I suspect some of the switch fingers will be
missing. When I get
that far into the diagnosis, I’ll be looking for help.
?
73
de Brian, VK2GCE.
?
On
Wednesday, 4
September 2019 10:39 AM, Dan said:
?
?
?Some time ago (2 years or more?) I repaired one of
these contact fingers
*in-situ*, without taking the instrument apart.? I
posted pictures in one
of the photo albums.? Look back through the messages
with my name in
them.? You might get lucky if you find the finger and
can manipulate it
well enough to epoxy it back into place.
On
Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul
Amaranth
<paul@...> wrote:
This
is a really common
problem.? Generally, the contacts fall off somewhere
inside
the unit, but they may go missing.? You can fabricate
some from suitable
shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the
original material was
(stainless? a
nickel alloy?) but given the age of the equipment and
the use it will likely get,
I don't
think it would matter a lot.? I think some have made
up contacts from a
piece of stainless
steel feeler gauges (like you would use in auto
repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros
wrote:
> hello , have a nice working spectrum 8558b with
electron beam memory?
, all is correct have checked , but the issue the time
division switch does not
work , in auto mode, , opened it and found a missing
part in the switch , from
the service manual sent with this spectrum analyser
from new only 40 years ago
part number is 5061-5425 pronger switch , it is the
metal leaf part which is
missing , checked and did not find it anywhere , so
question is does anyone
have or make these ? thanks
>
>
>
>
>
> !DSPAM:5d6ee55b212076544458839!
--
Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI,
USA
Aurora Group of Michigan, LLC? |? Security, Systems
& Software
paul@...? ? ?
? ? ? ? |? Unix & Windows? ? ?
? ? ? ?
|
Hello , the link to Paul's fix is great help , exactly same issu
I have with the switch !!
this was bad design...
thanks
Le 04/09/2019 à 03:59, Brian a écrit?:
toggle quoted message
Show quoted text
Hello
Dan,
?
Thanks
for keeping Paul’s description of his repair work.
?
And
Paul, Great job. Clearly, you have the patience of a saint.
I get you on the skills transfer from motor vehicle repairs
to HP switches –
when I did my elec eng degree, I was the ‘go-to’ guy for
motor vehicle power
train repairs.
?
This
evening, I have a friend’s HP-8640B coming to me for
servicing, and I suspect some of the switch fingers will be
missing. When I get
that far into the diagnosis, I’ll be looking for help.
?
73
de Brian, VK2GCE.
?
On
Wednesday, 4
September 2019 10:39 AM, Dan said:
?
?
?Some time ago (2 years or more?) I repaired one of
these contact fingers
*in-situ*, without taking the instrument apart.? I
posted pictures in one
of the photo albums.? Look back through the messages
with my name in
them.? You might get lucky if you find the finger and
can manipulate it
well enough to epoxy it back into place.
On
Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul
Amaranth
<paul@...> wrote:
This
is a really common
problem.? Generally, the contacts fall off somewhere
inside
the unit, but they may go missing.? You can fabricate
some from suitable
shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the
original material was
(stainless? a
nickel alloy?) but given the age of the equipment and
the use it will likely get,
I don't
think it would matter a lot.? I think some have made
up contacts from a
piece of stainless
steel feeler gauges (like you would use in auto
repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros
wrote:
> hello , have a nice working spectrum 8558b with
electron beam memory?
, all is correct have checked , but the issue the time
division switch does not
work , in auto mode, , opened it and found a missing
part in the switch , from
the service manual sent with this spectrum analyser
from new only 40 years ago
part number is 5061-5425 pronger switch , it is the
metal leaf part which is
missing , checked and did not find it anywhere , so
question is does anyone
have or make these ? thanks
>
>
>
>
>
> !DSPAM:5d6ee55b212076544458839!
--
Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI,
USA
Aurora Group of Michigan, LLC? |? Security, Systems
& Software
paul@...? ? ?
? ? ? ? |? Unix & Windows? ? ?
? ? ? ?
|
While I appreciate the credit, it wasn't my fix. I just posted the link.
As to a source of material to make your own, you can get a nice assortment
handily packaged for $4-5. Here's just one example:
I haven't measured the fingers, but I think 4-5 thousandths is about right.
Paul
toggle quoted message
Show quoted text
On Wed, Sep 04, 2019 at 02:04:26PM +0200, johnlegros wrote: Hello , the link to Paul's fix is great help , exactly same issu I have with
the switch !!
this was bad design...
thanks
Le 04/09/2019 à 03:59, Brian a écrit?:
Hello Dan,
Thanks for keeping Paul’s description of his repair work.
And Paul, Great job. Clearly, you have the patience of a saint. I get you
on the skills transfer from motor vehicle repairs to HP switches – when I
did my elec eng degree, I was the ‘go-to’ guy for motor vehicle power
train repairs.
This evening, I have a friend’s HP-8640B coming to me for servicing, and I
suspect some of the switch fingers will be missing. When I get that far
into the diagnosis, I’ll be looking for help.
73 de Brian, VK2GCE.
*On*Wednesday, 4 September 2019 10:39 AM, Dan said:
Hi John,
?Some time ago (2 years or more?) I repaired one of these contact fingers
*in-situ*, without taking the instrument apart.? I posted pictures in one
of the photo albums.? Look back through the messages with my name in
them.? You might get lucky if you find the finger and can manipulate it
well enough to epoxy it back into place.
Dan
On Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul Amaranth
<paul@...> wrote:
This is a really common problem.? Generally, the contacts fall off
somewhere inside
the unit, but they may go missing.? You can fabricate some from suitable
shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the original material was
(stainless? a
nickel alloy?) but given the age of the equipment and the use it will
likely get, I don't
think it would matter a lot.? I think some have made up contacts from a
piece of stainless
steel feeler gauges (like you would use in auto repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros wrote:
hello , have a nice working spectrum 8558b with electron beam memory , all is correct have checked , but the issue the time division switch does
not work , in auto mode, , opened it and found a missing part in the
switch , from the service manual sent with this spectrum analyser from new
only 40 years ago part number is 5061-5425 pronger switch , it is the
metal leaf part which is missing , checked and did not find it anywhere ,
so question is does anyone have or make these ? thanks
--
Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI, USA
Aurora Group of Michigan, LLC? |? Security, Systems & Software
paul@... <mailto:paul@...> ? ? ? ? |? Unix & Windows
!DSPAM:5d6fa85b228901465018402!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows
|
OK ,
thanks anyway , I will not use steel , have some very thin phosphore bronze , from shielding of routers , just have to cut it at correct dimension
Thanks
John
toggle quoted message
Show quoted text
Le 04/09/2019 à 14:46, Paul Amaranth a écrit?: While I appreciate the credit, it wasn't my fix. I just posted the link.
As to a source of material to make your own, you can get a nice assortment
handily packaged for $4-5. Here's just one example:
I haven't measured the fingers, but I think 4-5 thousandths is about right.
Paul
On Wed, Sep 04, 2019 at 02:04:26PM +0200, johnlegros wrote:
Hello , the link to Paul's fix is great help , exactly same issu I have with
the switch !!
this was bad design...
thanks
Le 04/09/2019 à 03:59, Brian a écrit?:
Hello Dan,
Thanks for keeping Paul’s description of his repair work.
And Paul, Great job. Clearly, you have the patience of a saint. I get you
on the skills transfer from motor vehicle repairs to HP switches – when I
did my elec eng degree, I was the ‘go-to’ guy for motor vehicle power
train repairs.
This evening, I have a friend’s HP-8640B coming to me for servicing, and I
suspect some of the switch fingers will be missing. When I get that far
into the diagnosis, I’ll be looking for help.
73 de Brian, VK2GCE.
*On*Wednesday, 4 September 2019 10:39 AM, Dan said:
Hi John,
?Some time ago (2 years or more?) I repaired one of these contact fingers
*in-situ*, without taking the instrument apart.? I posted pictures in one
of the photo albums.? Look back through the messages with my name in
them.? You might get lucky if you find the finger and can manipulate it
well enough to epoxy it back into place.
Dan
On Tuesday, September 3, 2019, 07:32:13 PM EDT, Paul Amaranth
<paul@...> wrote:
This is a really common problem.? Generally, the contacts fall off
somewhere inside
the unit, but they may go missing.? You can fabricate some from suitable
shim stock.
Here's one person who did that:
It's a bit of a ways down.? I'm not sure what the original material was
(stainless? a
nickel alloy?) but given the age of the equipment and the use it will
likely get, I don't
think it would matter a lot.? I think some have made up contacts from a
piece of stainless
steel feeler gauges (like you would use in auto repair).
good luck
On Tue, Sep 03, 2019 at 02:56:08PM -0700, johnlegros wrote:
hello , have a nice working spectrum 8558b with electron beam memory , all is correct have checked , but the issue the time division switch does
not work , in auto mode, , opened it and found a missing part in the
switch , from the service manual sent with this spectrum analyser from new
only 40 years ago part number is 5061-5425 pronger switch , it is the
metal leaf part which is missing , checked and did not find it anywhere ,
so question is does anyone have or make these ? thanks
--
Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI, USA
Aurora Group of Michigan, LLC? |? Security, Systems & Software
paul@... <mailto:paul@...> ? ? ? ? |? Unix & Windows
!DSPAM:5d6fa85b228901465018402!
|
John,
If yo ever succeed in obtaining the Tech Etch finger stock, it is of the exact dimensions as the HP part.? The only difference is in thew bend angle of the fingers in relation to the mounting portion of the stock which will require a little bending to match.
You are correct in your view of the poorness of the switch design.? HP should not have relied upon such a tiny dimension of the heat staked plastic to secure the fingers to the switch rotor.? We all know that plastic will become brittle over the years as the plasticizer slowly disperses over time.
Greg
|
Oh joy! The wonders of 20:20 hindsight!
I suspect that the HP engineers who designed these components
did not have the benefit of your 500 years experience in the design and
manufacture of plastics components.
When I did my engineering degree, plastics were looked down on
as cheap Japanese rubbish. But since then, scientists have done a great deal of
work to develop better plastics. Just look at the development of poly-vinyl-chlorides.
They’ll keep electricians in business for years as the old PVC wiring fails.
73 de Brian, VK2GCE.
?
On Thursday, 5
September 2019 2:53 AM, Greg chuntered:
John,
If yo ever succeed in obtaining the Tech Etch finger stock, it is of the exact
dimensions as the HP part.? The only difference is in thew bend angle of
the fingers in relation to the mounting portion of the stock which will require
a little bending to match.
You are correct in your view of the poorness of the switch design.? HP
should not have relied upon such a tiny dimension of the heat staked plastic to
secure the fingers to the switch rotor.? We all know that plastic will
become brittle over the years as the plasticizer slowly disperses over time.
Greg
|
Brian