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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Re: HP 853A - no CRT display at all - troubleshooting help needed
Headed over to section 8 (service) - troubleshooting - general. Paragraph 2 describes how to check analog circuitry; I temporarily removed A7 as instructed (what remains is an analog oscilloscope function) and still get no light output. A7 was put back into place.
Went back to re-measure the display regulator boad test points - the +158V test point actually reads about +168V, and it's status LED (DS3 I think - the scan isn't very good) is not lit. The other regulated and unregulated outputs (+/- 15V, 5V, 11V) are all correct.
Tks,
Dave
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Re: hp laser printer repair group?
On Wed, Oct 7, 2020 at 04:54 PM, David B wrote:
I have a bunch of HP LaserJet II, IID and III printers
I have a bunch... maybe 30... Laser Jet paper trays for II, 4, 4L, 2400. If anyone is interested PM me. (I'm not in CONUS... I'm here in the colonies.)
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Re: ROM / EEPROM firmware dump
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.?
Regards, John K1AE Sent by my iPhone
From: [email protected] on behalf of Tam Hanna <tamhan@...>
Sent: Wednesday, October 7, 2020 10:24 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] ROM / EEPROM firmware dump? We can try again. I had multiple such issues in the past, even with
clients who "whitelabeled" the GMAIL to work in their domain, and then
enabled its spam protection service.
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/
On 2020. 10. 08. 4:20, Dave McGuire wrote:
>
> ? I'd be quite surprised if gmail did it, but I don't mind being
> surprised.
>
> ? Either way, if some "provider" arbitrarily blocks content, it's time
> to move elsewhere.? Period.
>
> ???????????? -Dave
>
> On 10/7/20 10:19 PM, Tam Hanna wrote:
>> 1und1 of Germany do. So does GMAIL.
>>
>> With best regards
>> Tam HANNA
>>
>> Enjoy electronics? Join 15k7 other followers by visiting the Crazy
>> Electronics Lab at https://www.instagram.com/tam.hanna/
>>
>> On 2020. 10. 08. 4:17, Dave McGuire wrote:
>>>
>>> ? "The provider"?? What provider would that be?
>>>
>>> ? I can assure you that my mail server in particular pulls NO such
>>> shenanigans.
>>>
>>> ???????????? -Dave
>>>
>>> On 10/7/20 10:13 PM, Tam Hanna wrote:
>>>> No. The provider filters it.
>>>>
>>>>
>>>> Tam
>>>>
>>>> With best regards
>>>> Tam HANNA
>>>>
>>>> Enjoy electronics? Join 15k7 other followers by visiting the Crazy
>>>> Electronics Lab at https://www.instagram.com/tam.hanna/
>>>>
>>>> On 2020. 10. 08. 4:10, Dave McGuire wrote:
>>>>> On 10/7/20 9:56 PM, Tam Hanna wrote:
>>>>>> The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows
>>>>>> Scripting Host.
>>>>>>
>>>>>>
>>>>>> Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
>>>>>>
>>>>>>
>>>>>> Cesar: where are you based? Put it on an USB stick and mail it to
>>>>>> someone, I gladly pay the shipping fee.
>>>>>
>>>>> ? Good heavens.? This is only a problem if you run Windows. (but
>>>>> then you've got far bigger problems)
>>>>>
>>>>> ????????????? -Dave
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
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Re: HP3580A Repair- Spurious Signal
There are several HP 8556s on E-bay
Cheers!
Bruce
Quoting Steve Dench <sjdench48@...>:
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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
This usually works...
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:23, John Allen
wrote:
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How about zipping it WITH a password? The password keeps
the provider from looking inside the zip file.?
Regards, John K1AE
Sent by my iPhone
No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the
Crazy Electronics Lab at
On 2020. 10. 08. 4:10, Dave McGuire wrote:
> On 10/7/20 9:56 PM, Tam Hanna wrote:
>> The issue is YOU CANNOT EMAIL a vb / vbs file due to
Windows
>> Scripting Host.
>>
>>
>> Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs
file.*/_
>>
>>
>> Cesar: where are you based? Put it on an USB stick
and mail it to
>> someone, I gladly pay the shipping fee.
>
> ? Good heavens.? This is only a problem if you run
Windows.? (but then
> you've got far bigger problems)
>
> ????????????? -Dave
>
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Re: ROM / EEPROM firmware dump
How about zipping it WITH a password? The password keeps the provider from looking inside the zip file.?
Regards, John K1AE Sent by my iPhone
From: [email protected] on behalf of Tam Hanna <tamhan@...>
Sent: Wednesday, October 7, 2020 10:13 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] ROM / EEPROM firmware dump? No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/
On 2020. 10. 08. 4:10, Dave McGuire wrote:
> On 10/7/20 9:56 PM, Tam Hanna wrote:
>> The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows
>> Scripting Host.
>>
>>
>> Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
>>
>>
>> Cesar: where are you based? Put it on an USB stick and mail it to
>> someone, I gladly pay the shipping fee.
>
> ? Good heavens.? This is only a problem if you run Windows.? (but then
> you've got far bigger problems)
>
> ????????????? -Dave
>
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Re: ROM / EEPROM firmware dump
We can try again. I had multiple such issues in the past, even with clients who "whitelabeled" the GMAIL to work in their domain, and then enabled its spam protection service.
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
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Show quoted text
On 2020. 10. 08. 4:20, Dave McGuire wrote:
? I'd be quite surprised if gmail did it, but I don't mind being surprised.
? Either way, if some "provider" arbitrarily blocks content, it's time to move elsewhere.? Period.
???????????? -Dave
On 10/7/20 10:19 PM, Tam Hanna wrote:
1und1 of Germany do. So does GMAIL.
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:17, Dave McGuire wrote:
? "The provider"?? What provider would that be?
? I can assure you that my mail server in particular pulls NO such shenanigans.
???????????? -Dave
On 10/7/20 10:13 PM, Tam Hanna wrote:
No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:10, Dave McGuire wrote:
On 10/7/20 9:56 PM, Tam Hanna wrote:
The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. ? Good heavens.? This is only a problem if you run Windows. (but then you've got far bigger problems)
????????????? -Dave
|
Re: ROM / EEPROM firmware dump
I'd be quite surprised if gmail did it, but I don't mind being surprised.
Either way, if some "provider" arbitrarily blocks content, it's time to move elsewhere. Period.
-Dave
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Show quoted text
On 10/7/20 10:19 PM, Tam Hanna wrote: 1und1 of Germany do. So does GMAIL.
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:17, Dave McGuire wrote:
? "The provider"?? What provider would that be?
? I can assure you that my mail server in particular pulls NO such shenanigans.
???????????? -Dave
On 10/7/20 10:13 PM, Tam Hanna wrote:
No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:10, Dave McGuire wrote:
On 10/7/20 9:56 PM, Tam Hanna wrote:
The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. ? Good heavens.? This is only a problem if you run Windows. (but then you've got far bigger problems)
????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: ROM / EEPROM firmware dump
1und1 of Germany do. So does GMAIL.
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
toggle quoted message
Show quoted text
On 2020. 10. 08. 4:17, Dave McGuire wrote:
? "The provider"?? What provider would that be?
? I can assure you that my mail server in particular pulls NO such shenanigans.
???????????? -Dave
On 10/7/20 10:13 PM, Tam Hanna wrote:
No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:10, Dave McGuire wrote:
On 10/7/20 9:56 PM, Tam Hanna wrote:
The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. ? Good heavens.? This is only a problem if you run Windows. (but then you've got far bigger problems)
????????????? -Dave
|
Re: ROM / EEPROM firmware dump
"The provider"? What provider would that be?
I can assure you that my mail server in particular pulls NO such shenanigans.
-Dave
toggle quoted message
Show quoted text
On 10/7/20 10:13 PM, Tam Hanna wrote: No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 4:10, Dave McGuire wrote:
On 10/7/20 9:56 PM, Tam Hanna wrote:
The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. ? Good heavens.? This is only a problem if you run Windows.? (but then you've got far bigger problems)
????????????? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: ROM / EEPROM firmware dump
No. The provider filters it.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
toggle quoted message
Show quoted text
On 2020. 10. 08. 4:10, Dave McGuire wrote: On 10/7/20 9:56 PM, Tam Hanna wrote:
The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. ? Good heavens.? This is only a problem if you run Windows.? (but then you've got far bigger problems)
????????????? -Dave
|
Re: HP3580A Repair- Spurious Signal
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
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
|
Re: ROM / EEPROM firmware dump
On 10/7/20 9:56 PM, Tam Hanna wrote: The issue is YOU CANNOT EMAIL a vb / vbs file due to Windows Scripting Host.
Let me repeat that. _/*YOU CANNOT EMAIL A vb / vbs file.*/_
Cesar: where are you based? Put it on an USB stick and mail it to someone, I gladly pay the shipping fee. Good heavens. This is only a problem if you run Windows. (but then you've got far bigger problems) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP435 measuring head?
Hello,
this is peaceful.
I think I already entertained the Danaher mailing list of my adventures with the accountant who found out that she can play Solitaire on a TLA704...
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
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On 2020. 10. 07. 19:51, Dave McGuire wrote: On 10/7/20 1:44 PM, Wilko Bulte wrote:
Cray... I got to sit on one. At Shell here in NL. They were complaining their new Cray was less comfy than the previous model. Less padding ? ? That was real leather in the commercial machines.? But some US Gov't departments had restrictions on purchasing animal hide products, so Cray offered Naugahyde coverings over the power supply/coolant pump "bench" as an option for them.
? Now we're getting very much off-topic..
?????????????? -Dave
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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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Dave McGuire
John Allen