Re: HP 3325A/B Option 002 HV output kit - who wants one?
Please add me as well, 5 boards
Thank you,
Hal
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Re: HP 3325A - with a short in board A14 negative 15V supply
Hi,
I doubt it's the PSU, I would still suspect one of th the caps on the
A14. FOr a very simple check, you can measure resistance on the -15V
input of the board, if there is a dead short, that would show up. Or
you can supply the power from external source and see if that help and
that would also enable you to measure current.
Szabolcs
Maurice Smulders <Maurice.Smulders@...> ezt ¨ªrta (id?pont: 2020.
¨¢pr. 1., Sze, 7:40):
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Is there a known issue where there is a problem either in the PSU or Board A14.
Once A14 is connected (ALL other connectors are disconnected) the unit doesn't turn on (No LEDs)
No caps look to be bad - haven't had time to dig in deep...
What currents should the PSU be able to supply on +/- 15V and +5V, so i can test it with a resistor to see if the PSU is bad?
-Maurice
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Re: HP 3325A/B Option 002 HV output kit - who wants one?
Please add me in for one board. Don't know if I can fix my broken unit yet...
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HP 3325A - with a short in board A14 negative 15V supply
Is there a known issue where there is a problem either in the PSU or Board A14.
Once A14 is connected (ALL other connectors are disconnected) the unit doesn't turn on (No LEDs)
No caps look to be bad - haven't had time to dig in deep...
What currents should the PSU be able to supply on +/- 15V and +5V, so i can test it with a resistor to see if the PSU is bad?
-Maurice
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Re: HP 3325A/B Option 002 HV output kit - who wants one?
I'd like a board. I have a 3325A - with a problem likely in board A14.
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Fixing a sick 4332A LCR meter
Hi all,
I recently purchased a very nice looking 4332A LCR meter. It's in great shape cosmetically, but does not work properly. Power rails are in spec, voltage and ripple in or well within tolerance. Inside is clean, except on the A4 amplifier board. R35 (a 100 ohm 1/8W metal film) was cremated and reading well over 1K. No other components are visibly damaged. I replaced it with a 100 ohm 1/4W metal film resistor I had on hand, which did little. The new resistor is not getting hot at all, so perhaps someone overloaded it? In any case, the signals that the service manual says should be present on the various test points are either not present or of much smaller amplitude than the service notes call for. I'm at a loss for what to try next. It seems to me someone cooked that amplifier setup pretty good.
Anyone familiar with these little units? I'd like to get it working again but I have a feeling if any of the multilegged semiconductors used in the amplifier circuits are damaged, they are unobtainable.
Thanks,
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Hi gang,
??????????? Still trying to fix my 83592A plug in with uncontrolled rf output power,
Biggest problem is trying to isolate what the actual problem is.
Initially thought it was just an ALC (A4) problem but then found that i had multiple output peaks between? 10mhz and 2 ghz but they disappeared after that up to 20ghz.
more checking revealed that the same problem appeared on the auxillary output on the rear of the plug in, where the nominal 0dbm output is only -10dbm and as far as i am aware the rear output is the output of the yig in the 3 to 6 ghz range and? should be 0 dbm.
another observation is that the yig output varies considerably as it sweeps the 3-6 ghz range.
So i am beginning to think the yig or it's controller may be faulty.
Any suggestions?
Ken
VK2TKE
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I reseated the three boards and poked around behind the display to no avail.? Not sure if anything changed but now what I get is OL on power up until I push buttons then it reverts to all zeros.? When I change ranges the number of zeros changes.? The trigger LED flashes when it should.? I push TEST and it cycles from 11 down to zero and then goes back to 'operating' such as it is.? So the display is okay, I think.? The voltages seem okay also.
On Tuesday, March 31, 2020, 08:55:22 AM PDT, Bob Albert via Groups.Io <bob91343@...> wrote:
I will look at the connectors.? The voltages are okay, at least the ones I measured.? I am thinking maybe the unit is working but the data isn't reaching the display.? I will let you know.
Bob
On Tuesday, March 31, 2020, 07:41:22 AM PDT, n4buq <n4buq@...> wrote:
I don't know how similar the 3455A is to the 3456A, but I seem to remember a similar issue I had with a 3456A where merely reseating the ribbon cable connector to the display board fixed some odd display issues.? Again, not sure if the 3455A has a similar connector but it's worth a try if it has one.
Thanks,
Barry - N4BUQ
----- Original Message ----- > From: "Bob Albert via Groups.Io" <bob91343= [email protected]> > To: [email protected]> Sent: Monday, March 30, 2020 9:23:03 PM > Subject: Re: [HP-Agilent-Keysight-equipment] HP 3455a DVM repair > > Wow Ed you are going too fast for me! > Yes I heard relays clicking.? Now I get, besides the zeros, a display LL > whatever that means. > It is sitting here with me, not yet on the bench. > Bob >? ? On Monday, March 30, 2020, 06:55:59 PM PDT, Ed Giaimo >? ? < edgiaimo@...> wrote: > > > A lot of digital things are working if self test responds and you get zeroes > on the display. if the auto cal light is on and the processor reading > inputs, you should hear a regular pattern of relay clicking. Any noises? > > > Check the power supply output voltages, including the 10V reference on the > A10 analog pcba. > > On that same A10 board, JFETS manage signal attenuation driven by open > collector 7406 ICs U4-U9 from latches U11-U17. I have found broken 7406s > that could not pull to ground and latches that were not driving the 7406 > buffers. Most common is one or more damaged JFETS Q1, Q2, Q13-Q16 exposed to > the input bus. It is fairly easy to check voltage levels when the unit is > cycling thru attenuator settings during auto cal. > > > > > > > >
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I will look at the connectors.? The voltages are okay, at least the ones I measured.? I am thinking maybe the unit is working but the data isn't reaching the display.? I will let you know.
Bob
On Tuesday, March 31, 2020, 07:41:22 AM PDT, n4buq <n4buq@...> wrote:
I don't know how similar the 3455A is to the 3456A, but I seem to remember a similar issue I had with a 3456A where merely reseating the ribbon cable connector to the display board fixed some odd display issues.? Again, not sure if the 3455A has a similar connector but it's worth a try if it has one.
Thanks,
Barry - N4BUQ
----- Original Message ----- > From: "Bob Albert via Groups.Io" <bob91343= [email protected]> > To: [email protected]> Sent: Monday, March 30, 2020 9:23:03 PM > Subject: Re: [HP-Agilent-Keysight-equipment] HP 3455a DVM repair > > Wow Ed you are going too fast for me! > Yes I heard relays clicking.? Now I get, besides the zeros, a display LL > whatever that means. > It is sitting here with me, not yet on the bench. > Bob >? ? On Monday, March 30, 2020, 06:55:59 PM PDT, Ed Giaimo >? ? < edgiaimo@...> wrote: > > > A lot of digital things are working if self test responds and you get zeroes > on the display. if the auto cal light is on and the processor reading > inputs, you should hear a regular pattern of relay clicking. Any noises? > > > Check the power supply output voltages, including the 10V reference on the > A10 analog pcba. > > On that same A10 board, JFETS manage signal attenuation driven by open > collector 7406 ICs U4-U9 from latches U11-U17. I have found broken 7406s > that could not pull to ground and latches that were not driving the 7406 > buffers. Most common is one or more damaged JFETS Q1, Q2, Q13-Q16 exposed to > the input bus. It is fairly easy to check voltage levels when the unit is > cycling thru attenuator settings during auto cal. > > > > > > > >
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I don't know how similar the 3455A is to the 3456A, but I seem to remember a similar issue I had with a 3456A where merely reseating the ribbon cable connector to the display board fixed some odd display issues. Again, not sure if the 3455A has a similar connector but it's worth a try if it has one.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Bob Albert via Groups.Io" <bob91343@...>
To: [email protected]
Sent: Monday, March 30, 2020 9:23:03 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3455a DVM repair
Wow Ed you are going too fast for me!
Yes I heard relays clicking.? Now I get, besides the zeros, a display LL
whatever that means.
It is sitting here with me, not yet on the bench.
Bob
On Monday, March 30, 2020, 06:55:59 PM PDT, Ed Giaimo
<edgiaimo@...> wrote:
A lot of digital things are working if self test responds and you get zeroes
on the display. if the auto cal light is on and the processor reading
inputs, you should hear a regular pattern of relay clicking. Any noises?
Check the power supply output voltages, including the 10V reference on the
A10 analog pcba.
On that same A10 board, JFETS manage signal attenuation driven by open
collector 7406 ICs U4-U9 from latches U11-U17. I have found broken 7406s
that could not pull to ground and latches that were not driving the 7406
buffers. Most common is one or more damaged JFETS Q1, Q2, Q13-Q16 exposed to
the input bus. It is fairly easy to check voltage levels when the unit is
cycling thru attenuator settings during auto cal.
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Re: HP 8590L 1.8GHz SA possible frequent issue ? Does not power up
The PSU's are not unknown for failing.? I've known of three 859x SA's
that have failed that way in recent years.? Never heard if any were
resurrected or not.
I think the PSU's are a bought in product, not of HP/Agilent
manufacture, from other peoples comments on this (and other) list(s)
Dave G0WBX.
--
Created on and sent from a Unix like PC running and using free and open source software:
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Wow Ed you are going too fast for me!
Yes I heard relays clicking.? Now I get, besides the zeros, a display LL whatever that means.
It is sitting here with me, not yet on the bench.
Bob
On Monday, March 30, 2020, 06:55:59 PM PDT, Ed Giaimo <edgiaimo@...> wrote:
A lot of digital things are working if self test responds and you get zeroes on the display. if the auto cal light is on and the processor reading inputs, you should hear a regular pattern of relay clicking. Any noises??
Check the power supply output voltages, including the 10V reference on the A10 analog pcba.
On that same A10 board, JFETS manage signal attenuation driven by open collector 7406 ICs U4-U9 from latches U11-U17. I have found broken 7406s that could not pull to ground and latches that were not driving the 7406 buffers. Most common is one or more damaged JFETS Q1, Q2, Q13-Q16 exposed to the input bus. It is fairly easy to check voltage levels when the unit is cycling thru attenuator settings during auto cal.
|
A lot of digital things are working if self test responds and you get zeroes on the display. if the auto cal light is on and the processor reading inputs, you should hear a regular pattern of relay clicking. Any noises??
Check the power supply output voltages, including the 10V reference on the A10 analog pcba.
On that same A10 board, JFETS manage signal attenuation driven by open collector 7406 ICs U4-U9 from latches U11-U17. I have found broken 7406s that could not pull to ground and latches that were not driving the 7406 buffers. Most common is one or more damaged JFETS Q1, Q2, Q13-Q16 exposed to the input bus. It is fairly easy to check voltage levels when the unit is cycling thru attenuator settings during auto cal.
|
Re: HP 8662A Verification Tape (08662-10001)
Have we identified someone who can read these tapes?
Quoting Wolfgang Schraml <wschraml@...>:
toggle quoted message
Show quoted text
The tape is spoken for.
Thank you, Wolfgang
On Sat, Mar 14, 2020 at 10:26 AM, Bruce wrote:
I also have a tape I'd like to get recovered.
Maybe e can make it a group special ?
Quoting Wolfgang Schraml <wschraml@...>:
I'll repost in the HP Vintage Computer group to see if anyone there
has a reliable method to read/restore old 9825 tapes.
Thank you, Wolfgang KI7PFX
------------------------------------------------------------------------
On Fri, Mar 13, 2020 at 12:53 PM, Bruce wrote:
Probably a really good idea NOT to try it. Unless you have restored
your drive it will destroy the tape. I have been told that there are
people in the HP98XX group who can recover tapes (also possibly thee
HP museum ) - I'd research that avenue B4 trying to read the tape.
Quoting Jokken Feldhaar <jochen_feldhaar@...>:
Hi all,
I have a 9825 here at home. Last time I switched it on, it worked. But
of course, I haven't tried the tape reader fpr lack of tape.
Regards Jochen DH6FAZ
Am 09.03.2020 um 00:01 schrieb Dave McGuire:
On 3/8/20 12:47 PM, Wolfgang Schraml wrote:
I got my hands on an 8662A verification tape. I posted the
booklet/manual that came with it in the files section
( /g/HP-Agilent-Keysight-equipment/files/8662A ).
I do not have the 9825 controller to read the tape. It may not be
readable at all due to age. From the outside, it appears to be unused.
Anyways - if anyone has the means to read the tape, please let me know
and I will send it to you (US preferred to limit shipping expense). The
only ask I have is - if feasible - to post the contents/files in this
forum. I do not know whether these programs are stored in a binary
format that will only work for a 9825 or in a higher-level programming
language that could be converted to a different platform (e.g. HP Basic
on HP9000/300). Wow, it would be really good if this is able to be saved!
-Dave
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Re: HP 8662A Verification Tape (08662-10001)
The tape is spoken for.
Thank you, Wolfgang
toggle quoted message
Show quoted text
On Sat, Mar 14, 2020 at 10:26 AM, Bruce wrote:
I also have a tape I'd like to get recovered.
Maybe e can make it a group special ?
Quoting Wolfgang Schraml <wschraml@...>:
I'll repost in the HP Vintage Computer group to see if anyone there
has a reliable method to read/restore old 9825 tapes.
Thank you, Wolfgang KI7PFX
------------------------------------------------------------------------
On Fri, Mar 13, 2020 at 12:53 PM, Bruce wrote:
Probably a really good idea NOT to try it. Unless you have restored
your drive it will destroy the tape. I have been told that there are
people in the HP98XX group who can recover tapes (also possibly thee
HP museum ) - I'd research that avenue B4 trying to read the tape.
Quoting Jokken Feldhaar <jochen_feldhaar@...>:
Hi all,
I have a 9825 here at home. Last time I switched it on, it worked. But
of course, I haven't tried the tape reader fpr lack of tape.
Regards Jochen DH6FAZ
Am 09.03.2020 um 00:01 schrieb Dave McGuire:
On 3/8/20 12:47 PM, Wolfgang Schraml wrote:
I got my hands on an 8662A verification tape. I posted the
booklet/manual that came with it in the files section
( /g/HP-Agilent-Keysight-equipment/files/8662A ).
I do not have the 9825 controller to read the tape. It may not be
readable at all due to age. From the outside, it appears to be unused.
Anyways - if anyone has the means to read the tape, please let me know
and I will send it to you (US preferred to limit shipping expense). The
only ask I have is - if feasible - to post the contents/files in this
forum. I do not know whether these programs are stored in a binary
format that will only work for a 9825 or in a higher-level programming
language that could be converted to a different platform (e.g. HP Basic
on HP9000/300).
Wow, it would be really good if this is able to be saved!
-Dave
|
Re: Recommendation for desoldering iron/system?
On 3/30/20 10:13 AM, Bill Ripley wrote: I bought an Aoyue 474A++ that I have been /*unhappy* /with (link
below).? Not enough suction to properly de-solder anything.? Honestly,
I've nothing better than a good supply of braid and a bottle of good
flux with a needle top.? Since I learned how to do it properly, I've
never screwed up a board with solder braid.? I cant say the same for the
vacuum pump based desoldering stations.?
I have one of these, I use it all the time and I love it. I had a Hakko (FM204 I think?) years ago and it was great, but eventually died. This little Aoyue seems not quite as well-built, but certainly close, and it works wonderfully for me. YMMV I guess. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP 8590L 1.8GHz SA possible frequent issue ? Does not power up
Check the power source first.
On March 30, 2020 at 11:02 AM garp6 <hrgerson@...> wrote:
HP 8590L SA? Does not power up.
?5A Fuse is ok, but when depress front panel power switch,? Nothing.
? ?No LEDs, No fan operation.
Before taking? this puppy apart:
Is there possibly some frequent failure issue with this instrument ?
- front panel power switch failure ?
- Main PS Capacitor(s) or? Rifa mains filter Cap(s)? ?
- Dead battery hidden inside ?
thank you,
rick
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Re: Recommendation for desoldering iron/system?
I once dealt in Aoyue equipment, and their SMD rework
stuff is quite good, but their desoldering equipment is
pathetic.
They copied the Hakko gear quite thoroughly, but they
didn't quite understand that when dealing with small
vacuum systems you have to avoid all leaks... and boy
didn't they do that! The pump is a diaphragm pump, and
the cast bits they made the pump out of were treated
poorly in their handling, leaving sealing surfaces with
dents and chips from being banged about in a large drum,
as they were trucked from the supplier to the factory.
Prior to the Aoyue desoldering station, I had been
using a PACE MPT100, 200, and afterwards, I upgraded to
a PACE MBT215(?), and it much faster, and has a better
pump than the 100 series. The MBT210 and up have closed
loop heating systems, and as such react very quickly to
increases in load, such as happen the instant the solder
melts and makes super good thermal contact with the tip.
Use a good desoldering station, and you will wonder why
you were punishing yourself, and why you butchered all
those poor multilayer boards.
Chipquick is based on a faulty premise from the start.
The alloy renders the solder it mixes with unsuitable
for recycling. You start with two products that are
reasonably pure, and make a product that is hopelessly
mingled... suited for nothing but the landfill.
Don't count on it being around for very long.
-Chuck Harris
Clif Holland wrote:
toggle quoted message
Show quoted text
I have used Pace desoldering equipment since the 90's and wouldn't have anything else. I use the self contained and no air supply needed. Once you figure out how to maintain it all is well. I used solder suckers and chipquik before that and there is no comparison.
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Re: Maximum depth of HP rack mountable gear?
The deepest HPAK kit I know of is the 8922/23/24 series of radio test sets. They are 63cm (25") deep plus cable allowance.
800mm will be enough for any test kit.
I have a 8924C and it does not get moved much ;-). They are cellphone test sets but the 8924 is unique that it retains the functionality of the 8920B anlogue radio test set. more than twice the size but less than a quarter of the cost.
Robert G8RPI.
?
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HP 8590L 1.8GHz SA possible frequent issue ? Does not power up
HP 8590L SA? Does not power up.
?5A Fuse is ok, but when depress front panel power switch,? Nothing.
? ?No LEDs, No fan operation.
Before taking? this puppy apart:
Is there possibly some frequent failure issue with this instrument ?
- front panel power switch failure ?
- Main PS Capacitor(s) or? Rifa mains filter Cap(s)? ?
- Dead battery hidden inside ?
thank you,
rick
|
Harold Foster
Maurice Smulders
Dave McGuire