Re: hp laser printer repair group?
LOL at your last statement, Ed!? Shake that toner loose!
Years ago I worked at a start-up company that had an HP laser printer.? It worked fine, but I think the paper bail came apart.? One of our technicians was pretty handy, and he bolted it back together with some nuts and bolts we had lying around.? AFAIK, it was still running fine when that company bit the dust (a whole story in itself) about 15 years ago.
Jim Ford
------ Original Message ------
Sent: 10/8/2020 10:33:05 AM
Subject: Re: [HP-Agilent-Keysight-equipment] hp laser printer repair group?
I've owned and maintained many printers over the years, and found that it's a crap-shoot finding detailed info about the innards. There's some stuff out there on various makes and models, sometimes found in discussion groups, or from people that sell the inks and toners and such. After enough experience and disappointment with HP, Epson, Canon, et al, I long ago decided that Brother brand printers were the best for low cost, long term reliable running, and maintenance. They have been my favorites for at least a decade, and the only brand I would buy.?
About a year or so ago, my old HL-4040CN color laser crapped out, with some error code indicating the problem. It turned out that I had a pdf of the entire factory/shop service manual (several hundred pages) for it, that I had stumbled upon years earlier, while looking for something else. I dug up the manual, and determined that the laser scan motor had seized up. The manual has all the info needed to diagnose and take everything apart and replace modules, but I went a step beyond - I took the motor apart, cleaned it out, re-lubed the bearing, and it was back in business. I think normally, the entire optical scan unit (probably more expensive than a whole new printer) would have to be replaced.
More recently, it crapped out again, this time due to failures in the belt unit and other disposables. I can't really complain about this, since these consumable parts had never been replaced, and had run way past their normal life expectancy. At this point in the life of a printer, you have to weigh the cost of the replacement items versus getting a whole new printer. I decided to retire the 4040 and junked it out, even though it probably could have gone for a few more years. In its place, I have parked a HL-3040CN of similar vintage, that I've kept in reserve. When this one craps out, I'll get a brand new Brother whatever color laser. I don't know if I'll find a manual too - I guess I'll see when I get there.
Anyway, luck with keeping printers going and finding info is very variable, but since they have become such commodity items, it's not a big deal to attempt simple repairs even without much info to go on. There's not that much to lose if you make it worse. Sometimes even banging on stuff - like the the old TVs from way back - can make a difference.
Ed
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Re: hp laser printer repair group?
I've owned and maintained many printers over the years, and found that it's a crap-shoot finding detailed info about the innards. There's some stuff out there on various makes and models, sometimes found in discussion groups, or from people that sell the inks and toners and such. After enough experience and disappointment with HP, Epson, Canon, et al, I long ago decided that Brother brand printers were the best for low cost, long term reliable running, and maintenance. They have been my favorites for at least a decade, and the only brand I would buy.?
About a year or so ago, my old HL-4040CN color laser crapped out, with some error code indicating the problem. It turned out that I had a pdf of the entire factory/shop service manual (several hundred pages) for it, that I had stumbled upon years earlier, while looking for something else. I dug up the manual, and determined that the laser scan motor had seized up. The manual has all the info needed to diagnose and take everything apart and replace modules, but I went a step beyond - I took the motor apart, cleaned it out, re-lubed the bearing, and it was back in business. I think normally, the entire optical scan unit (probably more expensive than a whole new printer) would have to be replaced.
More recently, it crapped out again, this time due to failures in the belt unit and other disposables. I can't really complain about this, since these consumable parts had never been replaced, and had run way past their normal life expectancy. At this point in the life of a printer, you have to weigh the cost of the replacement items versus getting a whole new printer. I decided to retire the 4040 and junked it out, even though it probably could have gone for a few more years. In its place, I have parked a HL-3040CN of similar vintage, that I've kept in reserve. When this one craps out, I'll get a brand new Brother whatever color laser. I don't know if I'll find a manual too - I guess I'll see when I get there.
Anyway, luck with keeping printers going and finding info is very variable, but since they have become such commodity items, it's not a big deal to attempt simple repairs even without much info to go on. There's not that much to lose if you make it worse. Sometimes even banging on stuff - like the the old TVs from way back - can make a difference.
Ed
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Re: HP 853A - no CRT display at all - troubleshooting help needed
I had a 853A CRT slowly lose its vacuum.? The deflection amps roasted as
the current increased until the tube no longer showed a picture/trace.? -J-
-----Original Message----- From: "David Feldman via groups.io" <wb0gaz@...> Sent: Thursday, October 8, 2020 11:59am To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] HP 853A - no CRT display at all - troubleshooting help needed
So far - no hint of a glow, even in complete darkness. There's no beam finder control; there are position trimpots on the front which didn't bring anything into view. Verified (with power off) filament continuity (temporarily disconnect filament lines from HV board to CRT). No sign of residual light during power down. Also, sometimes when I turn on old-style oscilloscopes I hear a "crackling" sort of sound (as the HV comes up); no sign of this here. Status LEDs are lit except for the LED reflecting the 158V output of the display section power regulator - the test point where that LED is located is showing ~168V (supposed to be 158V.)
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Re: HP 853A - no CRT display at all - troubleshooting help needed
So far - no hint of a glow, even in complete darkness. There's no beam finder control; there are position trimpots on the front which didn't bring anything into view. Verified (with power off) filament continuity (temporarily disconnect filament lines from HV board to CRT). No sign of residual light during power down. Also, sometimes when I turn on old-style oscilloscopes I hear a "crackling" sort of sound (as the HV comes up); no sign of this here. Status LEDs are lit except for the LED reflecting the 158V output of the display section power regulator - the test point where that LED is located is showing ~168V (supposed to be 158V.)
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Several have asked about these boards.? ?I found a list in the box of what probably is in there¡ might have sold some years past.? ?But will if interested in specifics.?
I have¡?
8pcs-? 08753-60208 post reg 1pc -? ? ? ? ? ? ? -60108? post reg 1pc-? ? ? ? ? ? ? ?-60138 cpu 1pc-? ? ? ? ? ? ? ?-60125 cpu 8pcs-? ? ? ? ? ? ?-60957 ref assy 4pcs-? ? ? ? ? ? ?-60012 ref assy 1pc-? ? ? ? ? ? ? ?-60209 ref 5pcs-? ? ? ? ? ? ?-60170 graphics proc 7pcs-? ? ? ? ? ? ?-60068 freq N digital 1pc-? ? ? ? ? ? ? ?-60057 FN digital 5pcs-? ? ? ? ? ? ?-60013 FN Analog 6pcs-? ? ? ? ? ? ?-60162 phase lock 1pc-? ? ? ? ? ? ? ?-60082 phase lock 1pc-? ? ?5086- 7413? ?sampler 8pcs-? ? ? ? ? ? ?-60164 pulse gen
This is what I think is there.? ?Most I would guess at $40 ea? except new in bag at $75ea,? cpu's $100ea,? sampler $100ea, ¡ all plus shipping.? ?Will consider offer or trade for all¡ I hate scrapping these for the gold¡ but if no one wants them they have no value.?
Pete wa2odo?
A few pics¡ there's much more.?
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Re: Hp 8563E analyzer for sale refurbished price 1725Euro
Dear
I have sent you a PM on your address oz1lpr@...
BR
Diego Gustin
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Re: HP435 measuring head? kW's?
Bird is +/- 5% of full scale accuracy, not 10 as stated.
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I'll try downloading it again tonight. I can't use my work laptop because it will encrypt the file.
After sending the message last night, I finally got a message stating it wasn't allowing me to download because of some message stating? it's been accessed and/or downloaded too many times recently; and to try again at another point.
Also, I used a better power connection to that adapter (the 3.5" to 2.5") in case power was intermittent during booting. Unfortunately Windows is still not loading. I keep getting the same message: PXE-E61 media test failure, followed by: PKE-M0F exiting Intel PXE ROM
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It's a 52GB file compress to 23GB. I know it's huge. It took me several hours to upload it.?
I don't remember what is good and what is not. So it's hard for me to select particular things. When I had the unit, I had a backup drive with the original image, but when I sold it, I gave the drive to the buyer. If you can't download it, I can try to upload it an other way. Do you have suggestions?
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Re: ROM / EEPROM firmware dump
No problem with scrubbing - makes most sense and take your time. Thank you!
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8 okt. 2020 kl. 2:29 fm skrev Caesar Valenti <caesarv@...>:
? So much discussion on this...wow.
The program consist of an executable file (.exe) and two text files.? There is no real installation;? one just puts all three files in the same directory and then the program is run.??
I have already zipped up the files and sent it to KO4BB (Didier) and another person.? That other person had no issues with it. Let's see what Didier does with it first; I have not heard back from him yet.
It's not like this program will get continually used by the same person.? It only needs to be run once and then you have the keyword and are done.? Even if you can't run a VB program, it would be trivial to ask someone to do it for you.
For privacy reasons (names within the comments), I do not want to release the source code...I would have to first do some scrubbing of names.
P.S. Sorry, I should have renamed this tread as I am sure the original post got hijacked.
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Re: ROM / EEPROM firmware dump
Of course you can email .vbs.
Who needs Windows?
Willo
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Re: ROM / EEPROM firmware dump
So much discussion on this...wow.
The program consist of an executable file (.exe) and two text files.? There is no real installation;? one just puts all three files in the same directory and then the program is run.??
I have already zipped up the files and sent it to KO4BB (Didier) and another person.? That other person had no issues with it. Let's see what Didier does with it first; I have not heard back from him yet.
It's not like this program will get continually used by the same person.? It only needs to be run once and then you have the keyword and are done.? Even if you can't run a VB program, it would be trivial to ask someone to do it for you.
For privacy reasons (names within the comments), I do not want to release the source code...I would have to first do some scrubbing of names.
P.S. Sorry, I should have renamed this tread as I am sure the original post got hijacked.
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The slow reaction might originate from the file size. When I click the link, it says:? I (23G) is too large for Google to scan for viruses. Would you still like to download this file? , assuming that 23G is the file size. It might indeed take almost forever to download this file...
@JulienM: could you please check the actual file size? Thanks!
Chris
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Re: HP3580A Repair- Spurious Signal
Hi Bruce,? When I do an Ebay search it only shows one, that comes with 3 other units, while the price for the 4 items isnt bad, the postage to me in Australia for such a heavy package (of the 4 plugins) is way out of my budget. Its possible that other 8556s that are listed do not show up for me as they problably dont have international postage. (just a guess). Thanks for your reply. Steve.
On Thu, 8 Oct 2020, 1:28 pm Bruce, < bruce@...> wrote: There are several HP 8556s on E-bay
Cheers!
Bruce
Quoting Steve Dench <sjdench48@...>:
> Hi Bernie
>
> I have only been able to estimate the 90Hz signal by injecting a signal
> into the input from a sig gen at a high amplitude to override the spurious
> signal and see where it sits on the waveform. I actually suspect that the
> spurious signal is nothing like 90Hz but a signal close to the LO signal or
> a harmonic of it.
> Regarding the mixer, I have replaced the IC and the balance trim pot to no
> effect.
> I totally agree that the best way to fix it may be another 3850. I have for
> some time been on the lookout for a HP8556 plug in for my HP141T that would
> solve all the problems.
> Thank you for your suggestions
> Steve Dench
>
> On Thu, 8 Oct 2020, 11:07 am Ham Radio, <bernard.murphy@...> wrote:
>
>> Is the spur exactly 90 HZ?? That might be a clue.
>>
>> I would double check the mixer trim pot connections with an ohm meter on
>> low range and also reflow the solder of joints.
>>
>> You might need another 3580 to find the spur.? ?:-(
>>
>> --
>> Regards, Bernie Murphy
>>
>>
>
>
>
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Re: ROM / EEPROM firmware dump
On 10/7/20 11:29 PM, Kuba Ober wrote: Nothing disgusting about it. 99.9999% vbs traffic is malware. It¡¯d be criminal not to block it. No. What's criminal is OSs that are susceptible to BS like that being on a public network. The moment an upstream connection starts arbitrarily filtering traffic is the moment it ceases being a real network connection. End of story. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP 853A - no CRT display at all - troubleshooting help needed
Dave:
I have a couple of these myself. I suggest checking the deflection amplifier final stage resistors -- they went way off-value/open on both of my units. Check both horizontal and vertical. Also - check ALL of the high-voltage multi-megohm resistors associated with the various CRT grid voltages. These are right at the CRT itself. These commonly go open in older units and will lead to no display. You may need to buy a 10 or 20 megohm resistor to put in parallel so you can measure the higher resistance parts (i.e. above 20 megohms). Generally you will see the same failures over and over if you fix enough of these older HP displays.
One last thing - makes sure your lower-voltage DC rails are all good - I had one of these fail on a unit as well. At least make sure the status LEDs are all lit.
BR,
Ken
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of David Feldman via groups.io Sent: October 7, 2020 9:57 PM To: [email protected]Subject: [HP-Agilent-Keysight-equipment] HP 853A - no CRT display at all - troubleshooting help needed I have HP 853A mainframe with HP 8557B (the 75 ohm version) plug-in. The 853A CRT has no display light output at all, at any intensity/focus setting. If I plug an external scope set to X-Y display into the rear X-Y outputs, the analyzer plug-in appears to be functioning normally (and the same plug-in works fine in another 182 mainframe.) I've downloaded manual 00853-90010 and checked DC voltage test points on A3 (all were in spec), then went to section 5-13, and with a Tektronix P6015A 40 kV 1000:1 scope probe, I verified HV cathode (test point A4TP1) is close to the voltage marked on the module (-2467 volts). Step 5-13-8 it tells me to measure A6TP2 (which I think is a typo; there is a test point on A4 called A4TP2 and after this test point is checked, instructions tell me to put the cover of the HV section back on.) A4TP2 measures 27.3 volts at any setting of the front panel intensity control (the text in section 5-13 step 8 specifies 30.0 +/- 0.2 volts, and tells me what to do if the voltage is too high, but not too low.) I tried setting the 8557B to manual sweep to get a dot on the display, but no light seen. As the manual at this point anticipates that the CRT should be emitting light (and is mostly worried about too much intensity), I think I'm not looking in the right place. Any idea where to look next? Thanks!
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Re: ROM / EEPROM firmware dump
Nothing disgusting about it. 99.9999% vbs traffic is malware. It¡¯d be criminal not to block it. All you need to do is to zip it up if you really want to send it. Easy really. But in this case it would be a visual studio project with multiple files, not a solitary vbs file.
Cheers, Kuba
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7 okt. 2020 kl. 11:09 em skrev Dave McGuire <mcguire@...>:
?On 10/7/20 10:29 PM, John Allen wrote:
Comcast in US does it. I use pair.com in Pittsburgh as my email provider but Comcast as my ISP. I suspect most large ISPs do it. Disgusting. I hope to never be relegated to that sort of pseudo-connectivity. I'd certainly never put up with it.
You're not based in Pittsburgh, are you??
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: HP 853A - no CRT display at all - troubleshooting help needed
Check several other voltages and all will lead to no display. X or Y axis way off screen Blanking hard blanked off. I have run into all of these and the great news is its easy to find the issue when these are really bad. Also sometimes its useful to turn off all lights in a dark room any hint of a glow? Top bottom left right brightness all teh way up. Is there a beam finder? Good luck Paul
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Re: hp laser printer repair group?
On Wed, Oct 7, 2020 at 04:04 PM, Stephen Hanselman wrote:
But if you want to, get a bottle of fedron AKA Dr. Scat, or rubber roller restorer it really helps on the rollers.
Yes Fedron; but, there are other rubber cleaners/restorers. Do the others work as well as Fedron? The other cleaners/restorers have different chemical ingredients. Years ago, I heard something bad about Fedron (can't remember... maybe its was carcinogenic?)... or for some reason we couldn't buy it in the colonies...at the time. The printer techs loved it, but were down to secreting bottles of it in their kits. Maybe they changed the chemical composition of Fedron? On a more picayune note, its D-Limonene (for Dexto Limonene, the biologically preferred enantiomer of the molecule.)
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Re: ROM / EEPROM firmware dump
On 10/7/20 10:29 PM, John Allen wrote: Comcast in US does it. I use pair.com in Pittsburgh as my email provider but Comcast as my ISP. I suspect most large ISPs do it. Disgusting. I hope to never be relegated to that sort of pseudo-connectivity. I'd certainly never put up with it. You're not based in Pittsburgh, are you?? -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Dave McGuire