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Re: Thin black air filter foam

 

¿ªÔÆÌåÓý

Darn! Thank you, that¡¯s the stuff!? The magic incantation seems to be computer dust filter!

?

Thanks again

Dave

?

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: 14 July 2017 07:23
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Thin black air filter foam

?



Something like this?

Neil G4DBN

?

On 14 Jul 2017, at 07:10, 'David C. Partridge' david.partridge@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.

Used on the air inlet where the fan exhausts the unit.

What's this darn stuff called and where to get it (in UK ideally)?

?
Re: Thin black air filter foam

 

¿ªÔÆÌåÓý

Something like this?
Neil G4DBN

On 14 Jul 2017, at 07:10, 'David C. Partridge' david.partridge@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.

Used on the air inlet where the fan exhausts the unit.

What's this darn stuff called and where to get it (in UK ideally)?
Thin black air filter foam

 

About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.

Used on the air inlet where the fan exhausts the unit.

What's this darn stuff called and where to get it (in UK ideally)?

Thanks
Dave
8757C mother board

 

I am in need of a 08757-60066 mother board for a 8757C.
The 8757C that I bought cheap had a CPU battery leak and has made a mess
of the motherboard.
Before I remove, clean and rebuild the traces on this damaged mother
board, I though That I would ask the community if one is available from
a scrapped unit.

Appreciate any help.

Thanks
73
Glenn
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
---------------------------------------------------------------------------
Re: Replace Neon NE-2 with Zener in 141T PSU?

 

Replacing the ZZ1000 - My Summary.

A high-voltage zener will add a lot of drift.

It's a hassle to ovenize it.

Nine 9V zeners is better but still pretty bad.
To meet spec you have to use what HP used, the 1N938, a special temperature-compensated part which costs over $10 each today.

That's too expensive.

It's a hassle to rework the board to use a single 1N938 the way HP did.

Ed Breya's TL431 suggestion is the only one that's cheap, easy, and pretty good.
That's a TL431 plus a 65-75V zener.
150k and 4.7k in the divider gets you 82V.
No other changes needed.

That's how I see it.

Dave Wise
Re: Replace Neon NE-2 with Zener in 141T PSU?

arie schellaars
 

Hi from down under.
From memory I used an 8.2K 1 watt resistor as that is what I had on hand.
Also placed 68V and 14V zeners in series to make the necessary 82V level and again this is what was in
junk box.
Hope that helps.
Cheers and 73's
Arie
VK3DBF
--------------------------------------------

On Fri, 14/7/17, w7qed@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: Re: [hp_agilent_equipment] Replace Neon NE-2 with Zener in 141T PSU?
To: hp_agilent_equipment@...
Received: Friday, 14 July, 2017, 3:30 AM


?









Hi Arie,
I will
definitely try that first, removing the board does look like
a hassle.?
What value
of resistor did you end up with for R21 (5.4k is
stock)??
Thanks very
much,
--E









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Re: Wanted: HP Laserjet 4

 

Hi:

My HP 4050N with Duplex option got erratic so, after some research, got an HP LaserJet Pro M501DN (with Duplex and Networking). After some problems that were fixed by upgrading the printer firmware (I bought it new) and upgrading the drivers, it's very much like the 4050.

PS the problem was poor seating of the LAN card in the 4045. Removing it and reinstalling fixed the problem.



--
Have Fun,

Brooke Clarke

-------- Original Message --------
Re: Wanted: HP Laserjet 4
Re: Wanted: HP Laserjet 4

 

Always thought it was funny that the HP 8150 and the Lexmark Optra N are almost exactly the same - only the control panel is different.

On Thu, Jul 13, 2017 at 9:41 AM, Norm n3ykf normanlizeth@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

Have parts and toner. Just like having several of one piece of test gear. Swap parts, keep it running. As others have concurred, commercial equipment used in a home business lasts and lasts and lasts. Cheep to run and service.

LJ4's have gone sky high on the bay. 200$+! Most have 200k+ page count. Not willing to take a risk for that price.

Took Dave's advice. Bought an 8150DN, low page count. (26k) Seeing these units for sale with 1M+ imprints is common.

My choice was based on what would be supported in 10 years. LJ4's are 20 years old now. Nothing wrong with age. Parts are becoming difficult to find at a reasonable price, however.

Still have a rehabbed LJ4 (new fuser and total consumable parts PM) with all the extra parts and toner. This one cost 60$ with 5 new OEM toner cartridges. That's a metric ton of printing.

It's in a storage trailer. Due to the new abode, I'll see that stuff shortly before the snow flies. No use to me now.

Compare the cost (including consumables) of a rehabbed commercial printer with a wally world special or one aimed at small offices, (assuming that you're capable and willing to do the work yourself ), makes these an affordable alternative.

On Thu, Jul 13, 2017 at 12:16 PM, Daniel Koller kaboomdk@... [hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com> wrote:
?

Hi Norm,

Why (do you need a laserjet 4), may I ask?

? Dan



On Wednesday, July 12, 2017, 4:20:13 PM EDT, Norm n3ykf normanlizeth@... [hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com> wrote:


?

Title says it all. Reasonalbe page count, please. Must be working.

Will pick up in the northeast.

Have jetdirect cards, so that is not necessary.

Norman J McSweyn
Re: Wanted: HP Laserjet 4

Norm n3ykf
 

Depends on whether it's been rehabbed. Think the fuser is rated for 60k. Service manual shows intervals.

The bay shows many units for sale with 200k+. Starting at $200. Think I paid 75$ for a complete consumables kit minus the fuser. (rollers, gears, pads, etc.) Takes 45 minutes to do. (took me an hour prep time to make sure I knew what to do.)

Most well made things run for a long, long time if the prescribed preventative maintenance is done.

On Thu, Jul 13, 2017 at 1:59 PM, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

Okay I got the page count.? It's 56110.? Is that a high or low figure?

Bob


On Thursday, July 13, 2017 10:49 AM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" <hp_agilent_equipment@yahoogroups.com> wrote:


This one does a better job with the sub models, including the second test page:



On Thu, Jul 13, 2017 at 1:19 PM, Norm n3ykf <normanlizeth@...> wrote:
>
>
> Take care! One of the settings in this menu tells it to continue printing
> test pages forever............................
>
> Check your printer for it's actual part number. Some are slightly different,
> so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were
> produced for more than a few years and saw high penetration into the
> gov/biz/edu market.
>
> IIRC there are two test pages. One gives setup info, the other gives printer
> engine details and installed option data.
>
> Playing in our "Obsolete world" gives me hours and hours of quality
> entertainment.
>
> Norm
>


------------------------------------
Posted by: Norm n3ykf <normanlizeth@...
>
------------------------------------


------------------------------------

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Re: Wanted: HP Laserjet 4

Bob Albert
 

Okay I got the page count.? It's 56110.? Is that a high or low figure?

Bob


On Thursday, July 13, 2017 10:49 AM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" wrote:


This one does a better job with the sub models, including the second test page:



On Thu, Jul 13, 2017 at 1:19 PM, Norm n3ykf <normanlizeth@...> wrote:
>
>
> Take care! One of the settings in this menu tells it to continue printing
> test pages forever............................
>
> Check your printer for it's actual part number. Some are slightly different,
> so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were
> produced for more than a few years and saw high penetration into the
> gov/biz/edu market.
>
> IIRC there are two test pages. One gives setup info, the other gives printer
> engine details and installed option data.
>
> Playing in our "Obsolete world" gives me hours and hours of quality
> entertainment.
>
> Norm
>


------------------------------------
Posted by: Norm n3ykf <normanlizeth@...>
------------------------------------


------------------------------------

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Re: Asymmetric trace "dot" on Hp 141-T display section

 

¿ªÔÆÌåÓý

????????? Its been many years since I worked on a 141 but it seems to me it has an astigmatism adjustment in it. Listed in the handbook somewhere. Correcting this effect is what its for. You need to juggle between it and the focus to find the sharpest dot.

On 7/13/2017 10:39 AM, w7qed@... [hp_agilent_equipment] wrote:

Hi All,


On my recently acquired HP-141T,???8554B and 8552B plugins, I noticed that the trace has a sort of vertical thickness to it, as though someone is drawing the traces using a calligraphy pin oriented vertically. Horizontally, the trace is very sharp. Adjusting the focus makes it possible to bring the "dot" to a symmetric and round but fuzzier shape. I am using the "manual sweep" mode to judge the shape of the dot. The total height of the dot, vertically, is probably 4 or 5 mm.???


I then connected a tek 475 scope to the Vertical and Scan outputs. With the scope in XY mode, the trace is super crisp and does not have a vertical elongation to it. I think this test exonerates the plugins from causing the issue, but leaves the display section in question.


Thanks for any insights you may have,???


--Elliott

W6EL



???


-- 
Richard Knoppow
dickburk@...
WB6KBL
Asymmetric trace "dot" on Hp 141-T display section

 

Hi All,


On my recently acquired HP-141T,?8554B and 8552B plugins, I noticed that the trace has a sort of vertical thickness to it, as though someone is drawing the traces using a calligraphy pin oriented vertically. Horizontally, the trace is very sharp. Adjusting the focus makes it possible to bring the "dot" to a symmetric and round but fuzzier shape. I am using the "manual sweep" mode to judge the shape of the dot. The total height of the dot, vertically, is probably 4 or 5 mm.?


I then connected a tek 475 scope to the Vertical and Scan outputs. With the scope in XY mode, the trace is super crisp and does not have a vertical elongation to it. I think this test exonerates the plugins from causing the issue, but leaves the display section in question.


Thanks for any insights you may have,?


--Elliott

W6EL



?
Re: Replace Neon NE-2 with Zener in 141T PSU?

 

Hi Arie,

I will definitely try that first, removing the board does look like a hassle.?

What value of resistor did you end up with for R21 (5.4k is stock)??

Thanks very much,

--E
Re: Wanted: HP Laserjet 4

Norm n3ykf
 

This one does a better job with the sub models, including the second test page:

On Thu, Jul 13, 2017 at 1:19 PM, Norm n3ykf <normanlizeth@...> wrote:


Take care! One of the settings in this menu tells it to continue printing
test pages forever............................

Check your printer for it's actual part number. Some are slightly different,
so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were
produced for more than a few years and saw high penetration into the
gov/biz/edu market.

IIRC there are two test pages. One gives setup info, the other gives printer
engine details and installed option data.

Playing in our "Obsolete world" gives me hours and hours of quality
entertainment.

Norm
Re: Wanted: HP Laserjet 4

Norm n3ykf
 



Take care! One of the settings in this menu tells it to continue printing test pages forever............................

Check your printer for it's actual part number. Some are slightly different, so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were produced for more than a few years and saw high penetration into the gov/biz/edu market.

IIRC there are two test pages. One gives setup info, the other gives printer engine details and installed option data.

Playing in our "Obsolete world" gives me hours and hours of quality entertainment.

Norm
Re: Wanted: HP Laserjet 4

Bob Albert
 

How do you find the page count on an LJ4?

Bob


On Thursday, July 13, 2017 9:47 AM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" wrote:




Have parts and toner. Just like having several of one piece of test gear. Swap parts, keep it running. As others have concurred, commercial equipment used in a home business lasts and lasts and lasts. Cheep to run and service.

LJ4's have gone sky high on the bay. 200$+! Most have 200k+ page count. Not willing to take a risk for that price.

Took Dave's advice. Bought an 8150DN, low page count. (26k) Seeing these units for sale with 1M+ imprints is common.

My choice was based on what would be supported in 10 years. LJ4's are 20 years old now. Nothing wrong with age. Parts are becoming difficult to find at a reasonable price, however.

Still have a rehabbed LJ4 (new fuser and total consumable parts PM) with all the extra parts and toner. This one cost 60$ with 5 new OEM toner cartridges. That's a metric ton of printing.

It's in a storage trailer. Due to the new abode, I'll see that stuff shortly before the snow flies. No use to me now.

Compare the cost (including consumables) of a rehabbed commercial printer with a wally world special or one aimed at small offices, (assuming that you're capable and willing to do the work yourself ), makes these an affordable alternative.

On Thu, Jul 13, 2017 at 12:16 PM, Daniel Koller kaboomdk@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?
Hi Norm,

Why (do you need a laserjet 4), may I ask?

? Dan



On Wednesday, July 12, 2017, 4:20:13 PM EDT, Norm n3ykf normanlizeth@... [hp_agilent_equipment] <hp_agilent_equipment@ yahoogroups.com> wrote:


?
Title says it all. Reasonalbe page count, please. Must be working.

Will pick up in the northeast.

Have jetdirect cards, so that is not necessary.

Norman J McSweyn
Re: Wanted: HP Laserjet 4

Norm n3ykf
 

Have parts and toner. Just like having several of one piece of test gear. Swap parts, keep it running. As others have concurred, commercial equipment used in a home business lasts and lasts and lasts. Cheep to run and service.

LJ4's have gone sky high on the bay. 200$+! Most have 200k+ page count. Not willing to take a risk for that price.

Took Dave's advice. Bought an 8150DN, low page count. (26k) Seeing these units for sale with 1M+ imprints is common.

My choice was based on what would be supported in 10 years. LJ4's are 20 years old now. Nothing wrong with age. Parts are becoming difficult to find at a reasonable price, however.

Still have a rehabbed LJ4 (new fuser and total consumable parts PM) with all the extra parts and toner. This one cost 60$ with 5 new OEM toner cartridges. That's a metric ton of printing.

It's in a storage trailer. Due to the new abode, I'll see that stuff shortly before the snow flies. No use to me now.

Compare the cost (including consumables) of a rehabbed commercial printer with a wally world special or one aimed at small offices, (assuming that you're capable and willing to do the work yourself ), makes these an affordable alternative.

On Thu, Jul 13, 2017 at 12:16 PM, Daniel Koller kaboomdk@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

Hi Norm,

Why (do you need a laserjet 4), may I ask?

? Dan



On Wednesday, July 12, 2017, 4:20:13 PM EDT, Norm n3ykf normanlizeth@... [hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com> wrote:


?

Title says it all. Reasonalbe page count, please. Must be working.

Will pick up in the northeast.

Have jetdirect cards, so that is not necessary.

Norman J McSweyn
Re: Wanted: HP Laserjet 4

 

Hi Norm,

Why (do you need a laserjet 4), may I ask?

? Dan



On Wednesday, July 12, 2017, 4:20:13 PM EDT, Norm n3ykf normanlizeth@... [hp_agilent_equipment] wrote:


?

Title says it all. Reasonalbe page count, please. Must be working.

Will pick up in the northeast.

Have jetdirect cards, so that is not necessary.

Norman J McSweyn
HP 8082A Calibration

 

Has anyone here done a Calibration on a 8082A, the manual says it needs a 15265 test box ?


Gary Neilson
Re: ifr 2390 analyser

Bob Ocallaghan
 

hi cliff,,,,good to hear from you...both numbers are in my phone now,,not too good last few days so will get back to you..with mail
info on 10 ghz,,,soon as poss...have stopped ..yahoo groups...i had loads of e mails,,,none to do with my request,,,50 each day nearly.
keep well and xyl..

bob.ocall


From: "Cliff Barber g4bgp@... [hp_agilent_equipment]"
To: "hp_agilent_equipment@..."
Sent: Tuesday, 11 July 2017, 11:49
Subject: Re: [hp_agilent_equipment] ifr 2390 analyser

?
Hello Bob,
Please call me on either landline or mobile. Tnx
Cliff G4BGP


On Tue, 11 Jul 2017 at 10:57, Bob Ocallaghan bob.g1epl@... [hp_agilent_equipment]
wrote:
?
hi am looking for software to operate a marconi ifr spec anl..model 2390...and info on applying to analyser,or where i can get? installed..many thanks bob..uk.

Virus-free.


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