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

 

Here's an example:



If you make a replacement circuit that provides the same or close enough shunt regulator specs, it should drop in OK? without changing anything else. I think you can perform the surgery all from the component side without removing the PS board.

One nice thing about using a modern reference circuit is that the voltage won't overshoot. I'm convinced that many 141 failures were caused by temporary over-voltage while the gas tube had to reach striking voltage - significantly higher than running voltage.

Ed
Re: Wanted: HP Laserjet 4

 

I'd get a 4050 or 4100. These printers are REAL workhorses, has parallel port, network port, lots of memory, duplex option, cartridge for 15000 prints, can use 2/3 paper drawers and the whole works. I have some here and just can't let it go. Usually locks up a solenoid on paper pickup assembly, but after fix (I have a video on youtube with hundreds of thousands of views describing the repair but in portuguese) it wil work **forever**. I do love this printer <3

---

----- Original Message -----
From: "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
To: <hp_agilent_equipment@...>
Sent: Wednesday, July 12, 2017 5:20 PM
Subject: [hp_agilent_equipment] Wanted: HP Laserjet 4


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


---
Este e-mail foi verificado quanto a v??rus pelo AVG.
Re: Wanted: HP Laserjet 4

 

The rated monthly page duty cycle of the 8100 series is higher than
the total life expectancy of many consumer-grade printers.
I LOLed :D
Re: Wanted: HP Laserjet 4

 

On 07/12/2017 05:08 PM, Norm n3ykf normanlizeth@...
[hp_agilent_equipment] wrote:
I'll keep your suggestions in mind. Some pieces of gear were made better
and because of it, lasted longer. Looking for exactly what you're
describing.
Yes. I love my big non-cheap-consumer-crap printers. We put them
through far less abuse here than most big companies (but far more than
most individuals) and they don't even break a sweat.

Only reason I'm staying with the legacy product is I still have one (in
the moving truck, stored) and plenty of toner and parts.
That's a good situation to be in. :-)

Real estate droid (listing agent) stole mine at the old house. Can you
say "cancel my contract"?
Wow...! Sounds more to me like "call the cops!"

Missed a free 8150N.
Oh, that sucks. :-(

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Replace Neon NE-2 with Zener in 141T PSU?

 

Hi Gary, Denis, Ed, and Alan,

You are all correct, I read the value wrong. My printed schematic looks poor on paper!

Ok, so an 82 volt zener (or equivalent) would do the trick.?

Yes, that "bulb" does look rather large, perhaps an inch long or so.?

I will order a few from digikey next time I place an order.?

Thanks all,

--E
Re: Wanted: HP Laserjet 4

Norm n3ykf
 

Dave,

I'll keep your suggestions in mind. Some pieces of gear were made better and because of it, lasted longer. Looking for exactly what you're describing.

Only reason I'm staying with the legacy product is I still have one (in the moving truck, stored) and plenty of toner and parts.

Real estate droid (listing agent) stole mine at the old house. Can you say "cancel my contract"?

Missed a free 8150N.

Thanks,

Norm n3ykf

On Wed, Jul 12, 2017 at 4:56 PM, Dave McGuire Mcguire@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

On 07/12/2017 04:45 PM, Norm n3ykf normanlizeth@...
[hp_agilent_equipment] wrote:
> HP used to make awesome printers. Now? Just plastic junk. Send a wally
> world special 100 pages? It croaks.

 Their non-consumer printers are still top notch, but if you're not
prepared to drop $4,000 on one, forget it.

Personally, I use HP's older enterprise-grade printers, like the
8150DN (mono) and 8550DN (color). They are indestructible,
maintainable, and trivial to get supplies for. And 11x17 support,
duplexing, and 32 pages per minute is really, really nice.

The rated monthly page duty cycle of the 8100 series is higher than
the total life expectancy of many consumer-grade printers.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Replace Neon NE-2 with Zener in 141T PSU?

 

¿ªÔÆÌåÓý

I have two 141¡¯s. One with the infamous VR tube, which consistently blows fuses on the IF¡¯s, and one with a more recent power supply. I¡¯ve not used the older unit in years, but I have purchased a zener, in case I ever get back to that unit.
?
The zener came from digikey - 1N5375BGOS-ND
?
It¡¯s an 82 volt, 5W zener.
?
Gary Appel
?

Sent: Wednesday, July 12, 2017 9:12 AM
Subject: [hp_agilent_equipment] Replace Neon NE-2 with Zener in 141T PSU?
?
?

Hi All,


I have recently acquired an HP-141T with the 8554B and 8552B plugins. Over the past month, the fuses in the plugins have blown three times. I've heard this can be an indication of an issue with the display section's PSU.


Looking at the schematic and the board I have, I appear to have the older revision which uses neon lamps as a voltage reference. The lamp in my PSU board is pretty black looking -- that may be normal, I don't know.


At any rate, I wonder if I can replace the V1 neon with a 62 volt zener diode? Part number 2EZ62D5/TR8CT-ND from digikey, for example? I think any difference in the absolute level could be trimmed out using the +100V adjust pot. The biasing for the neon is a 5.6k resistor, I think that would work ok for the zener, but I could change it presumably.


Thoughts?


Thanks,


--E



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

 

Are you sure it's a 62V zener that's needed?

My HP141T neon was 82V. ?I ?have recently replaced the Neon in mine with two series connected 1W Zeners of 39V and 43V. ?It drifts slightly for about 20 minutes but then stays in spec. ?I did make a PCB to put a stack of 6.2V Zeners in series to give a better tempco but the two series connected Zeners seem fine.

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

 

If the part you're looking at is the voltage reference for the power supply, I believe you have some things to figure out. As I recall, the proper reference voltage is around 83-85V, produced by a miniature gas regulator tube that looks like a neon bulb, but much bigger. It's normally very stable, but does wear out eventually. I forget the part number, but it may be like Z1000, or 83A-something-something. It's definitely not supposed to be an NE-2, although someone may have put one there as an emergency substitute.

Once you figure out what's supposed to be there, you can replace it with a Zener or 431 circuit. This has been discussed a number of times over the years, so you may be able to find some info searching back, if it's possible anymore with this yahoo stuff - I think the last time the subject came up may be two years or so ago, so you'll have to dig pretty deep.

Ed
Re: Wanted: HP Laserjet 4

 

On 07/12/2017 04:45 PM, Norm n3ykf normanlizeth@...
[hp_agilent_equipment] wrote:
HP used to make awesome printers. Now? Just plastic junk. Send a wally
world special 100 pages? It croaks.
Their non-consumer printers are still top notch, but if you're not
prepared to drop $4,000 on one, forget it.

Personally, I use HP's older enterprise-grade printers, like the
8150DN (mono) and 8550DN (color). They are indestructible,
maintainable, and trivial to get supplies for. And 11x17 support,
duplexing, and 32 pages per minute is really, really nice.

The rated monthly page duty cycle of the 8100 series is higher than
the total life expectancy of many consumer-grade printers.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Replace Neon NE-2 with Zener in 141T PSU?

 

?
I have that circuit out in front of me trouble shooting that 100v supply on anothe system. My thought is that a 62v "zener" is not close enough to the 82v neon. You need another 20v?"zener" in series to make up the difference. R118 only has a swing of about 9v so not enough to make up for the lower voltage.?The 5.6k would deffinitely need increasing as the 62v?zener will be dissipating 400mW.
Good luck taking that pcb out is not a job to be undertaken lightly!!
?
Alan
G3NYK

----- Original Message -----
Sent: Wednesday, July 12, 2017 8:12 PM
Subject: [hp_agilent_equipment] Replace Neon NE-2 with Zener in 141T PSU?

Hi All,


I have recently acquired an HP-141T with the 8554B and 8552B plugins. Over the past month, the fuses in the plugins have blown three times. I've heard this can be an indication of an issue with the display section's PSU.?


Looking at the schematic and the board I have, I appear to have the older revision which uses neon lamps as a voltage reference. The lamp in my PSU board is pretty black looking -- that may be normal, I don't know.


At any rate, I wonder if I can replace the V1 neon with a 62 volt zener diode? Part number?2EZ62D5/TR8CT-ND from digikey, for example? I think any difference in the absolute level could be trimmed out using the +100V adjust pot. The biasing for the neon is a 5.6k resistor, I think that would work ok for the zener, but I could change it presumably.&n bsp;


Thoughts??


Thanks,


--E



?
Re: Wanted: HP Laserjet 4

Norm n3ykf
 

Rebuild kits are el-cheapo for the LJ-4. Fixes error 13.

Toner (OEM) can be had on Craigslist. Offices cleaning out the closet. Bought a closet full. (like 10 OEM toner cartridges). Have two rebuild kits in stock.

Think the rebuild kits minus the fuser is 75$ This takes care of all the paper handling stuff inside the printer. (rollers and gears, too).

HP used to make awesome printers. Now? Just plastic junk. Send a wally world special 100 pages? It croaks.


Norm n3ykf

On Wed, Jul 12, 2017 at 4:41 PM, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

I am quite satisfied with my printer but don't have a cheap source of? toner.? Further, HP has a reputation of paper feed problems due to broken plastic gears.? Yes duplex is an add on but it's a good one.

I have a model 5000 too and it sucks.? My Brother and Savin units are fast and great but the Savin is out of toner.

I really don't like inkjet printers.? The ink isn't waterproof, and they gobble it up in expensive style.? Clogged heads too.

I want a color laser.? I have two but they don't work, both HP 1500.? My daughter lets me use her HP but it's a cheapie and I don't want to use it up.

Bob


On Wednesday, July 12, 2017 1:35 PM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" <hp_agilent_equipment@yahoogroups.com> wrote:




Bob,

The duplexer is a mechanical add-on. It won't natively do duplex.

These things are great. Easy to work on. Awesome for printing manual pages when doing a project.

Hit control+P and give it 100 pages. Spits it out and asks for more.

Norm

On Wed, Jul 12, 2017 at 4:30 PM, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com> wrote:
?
I have one of these.? It was used by someone who couldn't figure out how to make it do duplex; that's why I got it very cheaply.


On Wednesday, July 12, 2017 1:20 PM, "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


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


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

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Re: Wanted: HP Laserjet 4

Bob Albert
 

I am quite satisfied with my printer but don't have a cheap source of? toner.? Further, HP has a reputation of paper feed problems due to broken plastic gears.? Yes duplex is an add on but it's a good one.

I have a model 5000 too and it sucks.? My Brother and Savin units are fast and great but the Savin is out of toner.

I really don't like inkjet printers.? The ink isn't waterproof, and they gobble it up in expensive style.? Clogged heads too.

I want a color laser.? I have two but they don't work, both HP 1500.? My daughter lets me use her HP but it's a cheapie and I don't want to use it up.

Bob


On Wednesday, July 12, 2017 1:35 PM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]"




Bob,

The duplexer is a mechanical add-on. It won't natively do duplex.

These things are great. Easy to work on. Awesome for printing manual pages when doing a project.

Hit control+P and give it 100 pages. Spits it out and asks for more.

Norm

On Wed, Jul 12, 2017 at 4:30 PM, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?
I have one of these.? It was used by someone who couldn't figure out how to make it do duplex; that's why I got it very cheaply.


On Wednesday, July 12, 2017 1:20 PM, "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


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


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

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Re: Wanted: HP Laserjet 4

Norm n3ykf
 

Bob,

The duplexer is a mechanical add-on. It won't natively do duplex.

These things are great. Easy to work on. Awesome for printing manual pages when doing a project.

Hit control+P and give it 100 pages. Spits it out and asks for more.

Norm

On Wed, Jul 12, 2017 at 4:30 PM, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

I have one of these.? It was used by someone who couldn't figure out how to make it do duplex; that's why I got it very cheaply.


On Wednesday, July 12, 2017 1:20 PM, "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


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


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

Yahoo Groups Links

<*> To visit your group on the web, go to:
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<*> To unsubscribe from this group, send an email to:

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Re: Wanted: HP Laserjet 4

Bob Albert
 

I have one of these.? It was used by someone who couldn't figure out how to make it do duplex; that's why I got it very cheaply.


On Wednesday, July 12, 2017 1:20 PM, "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


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


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

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<*> To visit your group on the web, go to:
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Wanted: HP Laserjet 4

Norm n3ykf
 

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

 

Hi All,


I have recently acquired an HP-141T with the 8554B and 8552B plugins. Over the past month, the fuses in the plugins have blown three times. I've heard this can be an indication of an issue with the display section's PSU.?


Looking at the schematic and the board I have, I appear to have the older revision which uses neon lamps as a voltage reference. The lamp in my PSU board is pretty black looking -- that may be normal, I don't know.


At any rate, I wonder if I can replace the V1 neon with a 62 volt zener diode? Part number?2EZ62D5/TR8CT-ND from digikey, for example? I think any difference in the absolute level could be trimmed out using the +100V adjust pot. The biasing for the neon is a 5.6k resistor, I think that would work ok for the zener, but I could change it presumably.?


Thoughts??


Thanks,


--E



?
Re: HP 8566B / 8568B bus interconnect cable

 

What sort of problems are you looking to have with it?
It is simply a parallel connection at HSWP In/Out, Pin 44, wire is white with black/green tracer.
Connector is $15 outside world option (not used), unless you have an actual piece of equipment to connect it to. It stops the sweep during a band change. If you have that particular cable acting funny, open it and look at the solder connections. I have several cables -60094 and -60220 that look like they were used for carcass hangers with pulled wires broken inside of housing.

Dennis



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

On Wed, 7/12/17, rastr0@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: [hp_agilent_equipment] Re: HP 8566B / 8568B bus interconnect cable
To: hp_agilent_equipment@...
Date: Wednesday, July 12, 2017, 12:55 PM


I have an HP 8566B working using a 85662-60220 cable.? What
are the failure symptoms when you use this cable on your
8566?

-rastro
Re: HP 8566B / 8568B bus interconnect cable

 

I have an HP 8566B working using a 85662-60220 cable.? What are the failure symptoms when you use this cable on your 8566?

-rastro
Re: HP 8745ES

 

You might get more help if you provide the proper model number.? I assume it is an 8714ES.
67241 - 67260 of 151414