Re: 8590B power supply problem
Hi George,
Thanks for your kind advices, I know the difficulties of working on
switching power supply...have been in electronics the past 44 years, and
sure, I do prefer repairing linear ps!
Now, I am retired, but always trying to repair equipments for
friends...sometimes, it's a real challenge!
73,
Roland F8CHK
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-----Message d'origine-----
De?: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
Envoy¨¦?: lundi 17 juillet 2017 15:56
??: hp_agilent_equipment@...
Objet?: Re: [hp_agilent_equipment] Re: 8590B power supply problem
Hi Roland
I have been following this thread from the start.
In my experience you stand little or no chance of finding a true schematic,
what you need to do is to find someone who knows how to repair SMPSU's and
has the facilities for doing so. You can only really fault find on them
when they are fully energised by the incoming mains supply. This requires
specialist skills and precautions coupled with a safe working environment.
There are lethal voltages present (370VDC at very low impedance) also a
simple mistake can result in the SMPSU going into total self destruct mode.
73 George G6HIG
________________________________________
From: hp_agilent_equipment@...
<hp_agilent_equipment@...> on behalf of roland.etienne@...
[hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 17 July 2017 11:42
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8590B power supply problem
Hi Tom,
I have the same power supply as yours and it's a faulty one also...I wonder
if you sojve your problem and if you could identify fhe HP900 component ? I
also think that it is an optocoupler, but not sure at all! It's a pity we
can't find the exact schematics of this power supply!
My primary circuitry looks fine, have made some tests connecting 12 v from
an external power supply so the NE5560 is running, signals seem to be OK on
the buck regulator and the DC-DC converter.
So may be the problem is in the feedback??
If you have any infos, I thank you in advance!
73,
Roland F8CHK
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Yahoo Groups Links
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I am looking for a copy of Safety Service Note 8757C/E-02-S? This is referenced by Bench Briefs 2ND Quarter 1990.
Does anyone have a copy of this that they would share?
Thanks
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: 8590B power supply problem
Hi Roland
I have been following this thread from the start.
In my experience you stand little or no chance of finding a true schematic, what you need to do is to find someone who knows how to repair SMPSU's and has the facilities for doing so. You can only really fault find on them when they are fully energised by the incoming mains supply. This requires specialist skills and precautions coupled with a safe working environment. There are lethal voltages present (370VDC at very low impedance) also a simple mistake can result in the SMPSU going into total self destruct mode.
73 George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of roland.etienne@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 17 July 2017 11:42
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8590B power supply problem
Hi Tom,
I have the same power supply as yours and it's a faulty one also...I wonder if you sojve your problem and if you could identify fhe HP900 component ? I also think that it is an optocoupler, but not sure at all! It's a pity we can't find the exact schematics of this power supply!
My primary circuitry looks fine, have made some tests connecting 12 v from an external power supply so the NE5560 is running, signals seem to be OK on the buck regulator and the DC-DC converter.
So may be the problem is in the feedback??
If you have any infos, I thank you in advance!
73,
Roland F8CHK
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Re: mini SMB connector type?
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While doing some work to my 140B recently, it was necessary to remove the slide-in connectors along one edge of the A602 board (to enable it to be lifted up a bit). It had been apart for a couple of weeks and, yesterday, I went to reconnect the wires.
The wires are color-coded and the color codes are labeled on the board so it's not too difficult to tell which wire connectes where; however, when I had all the connectors installed, I noticed there was an empty slot on the board. I didn't recall that when I took it apart but I might have overlooked that (or forgot it in the interim).
Anyway, after searching for the "missing" wire, I finally concluded that a wire was not initially connected to that slot. The scope seems to work okay as-is so I think I was right; however, it does have me curious.
The empty slot is labeled "924" (white,red,yellow). Looking at the schematic, there are two 924 connections to that board; however, there are three 924 slots. The picture of that board in the manual clearly shows three slots as well.
After a bit of checking, I determined where the two 924 wires that do exist should go into which 924 slots. On further examination, I discovered that the empty 924 slot is connected (via trace on the underside of the board) to the adjacent 945 slot/wire.
BTW, 945 is the connection to the EXT/INT Z AXIS INPUT switch. One of the 924 wires is the UNBLANKING signal from one of the plugins and the other 924 connects to one of the transformer secondaries on the HV board.
Anyone know why there'd be an extra 924 slot that's connected to the 945 slot that way? I thought it might be for a test configuration or an option but don't know. Just curious...
Thanks,
Barry - N4BUQ
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Hi, I had a couple of intermittent faults on mine (E14 & 35) which could never be induced to appear when the top two PCBs were 'unfolded' to their service position. One was tracked down to one of the ribbon cables that, when the PCBs were folded down and the ribbon was tucked under the board had damaged insulation which looked it was caused by the ends of its own PCB connector tails on the underside of the board. Clipping the tails and a bit of Kapton tape fixed that. The other took an age to find and turned out to be one of the big plug-in ICs with heatsinks (U302?) on the bottom board had one of its legs curled under itself rather than plugged into the socket and thus contact was intermittent depending what was pressing on it - or not!
The moral of the story was just the act of opening the thing up (and closing it) could induce faults (and clear them!) it doesn't have to be anything to do with the bit you worked on!
Good luck! Adrian
On Monday, July 17, 2017 12:07 PM, "'David C. Partridge' david.partridge@... [hp_agilent_equipment]" wrote:
?
This pulse generator *was* working, but the NiCd battery was dead, so I
removed it. After repairing the track damage on the CPU board I powered it
back on, to find it was displaying E11.
Odd, since I went nowhere near the main board.
Has anyone hit E11 on these before? If so any hints and tips would be
welcome.
Thanks
Dave
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So I opened it up to take a look with the CPU and control board propped up
at the sides, powered it on and the error was gone!!
Looks like a connector not making properly? Anyway I re-seated all the
connectors and closed it up and it still works!
Oh well, you do get the odd easy one.
Dave
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
Sent: 17 July 2017 12:07
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] 8112A error code E11
This pulse generator *was* working, but the NiCd battery was dead, so I
removed it. After repairing the track damage on the CPU board I powered it
back on, to find it was displaying E11.
Odd, since I went nowhere near the main board.
Has anyone hit E11 on these before? If so any hints and tips would be
welcome.
Thanks
Dave
------------------------------------
Posted by: "David C. Partridge" <david.partridge@...>
------------------------------------
------------------------------------
Yahoo Groups Links
|
Re: 8590B power supply problem
Hi Tom,
I have the same power supply as yours and it's a faulty one also...I wonder if you sojve your problem and if you could identify fhe HP900 component ? I also think that it is an optocoupler, but not sure at all! It's a pity we can't find the exact schematics of this power supply!
My primary circuitry looks fine, have made some tests connecting 12 v from an external power supply so the NE5560 is running, signals seem to be OK on the buck regulator and the DC-DC converter.
So may be the problem is in the feedback??
If you have any infos, I thank you in advance!
73, Roland F8CHK
|
I have noticed that the damage done by nicads in
electronic gear often goes far beyond the location
of the nicad. For instance, on the 8350B, the
nicad pack is screwed to the frame on the side
of the plugin slot. The nicad damage destroys
the battery pack and its socket, of course, but
it also causes corrosion on the circuitry in the
plugin, and on the main frame's motherboard, and
the HPIB board.
I suspect that your failed nicad did similar
damage in your 8112A. When you removed or moved
connectors, you broke what little connection they
had, and the corrosion prevents reconnection.
-Chuck Harris
'David C. Partridge' david.partridge@... [hp_agilent_equipment] wrote:
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This pulse generator *was* working, but the NiCd battery was dead, so I
removed it. After repairing the track damage on the CPU board I powered it
back on, to find it was displaying E11.
Odd, since I went nowhere near the main board.
Has anyone hit E11 on these before? If so any hints and tips would be
welcome.
Thanks
Dave
------------------------------------
Posted by: "David C. Partridge" <david.partridge@...>
------------------------------------
------------------------------------
Yahoo Groups Links
|
This pulse generator *was* working, but the NiCd battery was dead, so I
removed it. After repairing the track damage on the CPU board I powered it
back on, to find it was displaying E11.
Odd, since I went nowhere near the main board.
Has anyone hit E11 on these before? If so any hints and tips would be
welcome.
Thanks
Dave
|
I have been trying to get a second 141T mainframe going but have been seeing
some rather odd traces on it. I'm using a pair of known good
8554B and 8552A? plug-ins from my other 141T to drive it. The trace has
an odd kink in it midway across it which changes on changing the astig and
brightness controls and there seems to be a dc offset on the trace as I cannot
position it to the bottom of the screen only upwards using the vertical position
controls on the IF unit. The amplitude 10dB increments are only about 1-2dB?
when I adjust the rf and If controls. The focus, astig., intensity and trace
rotation controls besides controlling what they are meant to control in a sort of way,?
also produce a dc shift moving the trace up and down the screen. I have
carefully set up the 4 voltages +/-100,? 12.6 and 248volts to no avail. I've a short video here showing the effects I'm getting on the 30MHz calibration signal:- Anyone shed any light? ?
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HP HIL system to lend or buy?
Hello Folks,
just made the decision - I am going forward with the HP keyboard emulator.
Sadly, I dont have any HP HIL equipment in house. My question is, if anyone of you is willing to sell or lend anything? I would gladly pay shipping both ways for lending, and a lend fee.
Tam
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Re: mini SMB connector type?
I recently picked up some telco equipment that turned out to have N to SMZ adapters. Maybe you can Google and compare your connectors.
Dennis
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On Sun, 7/16/17, Peter Gottlieb hpnpilot@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: [hp_agilent_equipment] mini SMB connector type?
To: hp_agilent_equipment@...
Date: Sunday, July 16, 2017, 10:30 PM
I have a piece of gear which uses coaxial
connectors which look like push-on SMB
but are somewhat smaller.
Does anyone happen to know what they
are called?
Peter
------------------------------------
Posted by: Peter Gottlieb <hpnpilot@...>
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? ? (Yahoo! ID required)
? ? hp_agilent_equipment-fullfeatured@...
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Re: mini SMB connector type?
MCX?
Glenn
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On 7/16/2017 10:30 PM, Peter Gottlieb hpnpilot@... [hp_agilent_equipment] wrote: I have a piece of gear which uses coaxial connectors which look like push-on SMB
but are somewhat smaller.
Does anyone happen to know what they are called?
Peter
------------------------------------
Posted by: Peter Gottlieb <hpnpilot@...>
------------------------------------
------------------------------------
Yahoo Groups Links
--
-----------------------------------------------------------------------
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"
---------------------------------------------------------------------------
|
I have a piece of gear which uses coaxial connectors which look like push-on SMB but are somewhat smaller.
Does anyone happen to know what they are called?
Peter
|
Re: 141T reference replacement..a cure??
My Faux Pas, This should work: <<<
Dennis -------------------------------------------- On Sun, 7/16/17, 'Thomas S. Knutsen' la3pna@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote: Subject: Re: [hp_agilent_equipment] Re: 141T reference replacement..a cure?? To: "hp_agilent_equipment@..." <hp_agilent_equipment@...> Date: Sunday, July 16, 2017, 7:43 PM That link ain't gonna work, its to a file local on your computer! FWIW, there is no metal film resistors in the 141T, but there is a lot of carbon film resistors! Those should not be mixed up, as their preformance is quite different. BR.Thomas. 2017-07-17 1:25 GMT+02:00 Dennis Czelusniak czelusniakd@... [hp_agilent_equipment] <hp_agilent_equipment@...>: These tubes were designated as Z82R7. Spec sheet is at folowing link. >>> file:///C:/Documents%20and% 20Settings/Administrator/My% 20Documents/Downloads/ Signalite-Hivac%20neon% 20regulators-LM317.pdf <<< Who would think replacing this obsolete tube would cause such an upstir! Dennis ------------------------------ -------------- On Sat, 7/15/17, Jeremy Nichols jn6wfo@... [hp_agilent_equipment] <hp_agilent_equipment@ yahoogroups.com> wrote: Subject: Re: [hp_agilent_equipment] Re: 141T reference replacement..a cure?? To: hp_agilent_equipment@ yahoogroups.com Date: Saturday, July 15, 2017, 11:16 PM There might be some NOS parts somewhere but neither Google nor eBay brings up anything for "Signalite 82R7." Jeremy? Visit Your Group New Members 8 ? Privacy ? Unsubscribe ? Terms of Use
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Re: 141T reference replacement..a cure??
The file 'Signalite-Hivac neon regulators-LM317.pdf' is available from this link:
in a thread called '120V, 400mW Zener Diodes?' on the UK Vintage Radio Repair and Restoration Discussion forum at
?.
I saved a copy on my hard drive.
?
But the real gem is buried in the discussion.? The Philips PM3266 scope switched from a V116R2 to a zener/transistor circuit.
See the "Unit 7 - Focus" schematic on page 29.? Scans of the manual are out there.
?
They used a BZX79-C7V5 zener, whose tempco is +4mV/K, and a BF422 darlington pair whose tempco is -4.2mV/K.? The transistor pair?is stacked on top of the zener, cancelling the tempco's, and the base is driven by a resistive voltage divider which multiplies
(Vz + Vbe) by (R1+R2)/R2.? For?82V, we'd use .? Any quiet low-current zener with +4.2mV/K tempco would do.
?
However, the actual tempco of the zener is loosely controlled, +4 is just the typical value.? We're better off (and one component less) with a multiplied TL431.? This is in my opinion still the only approach that is simultaneously easy, cheap, and good.
?
Since it's the ratio and not the individual value that's important, any pair of thermally-coupled resistors with similar tempco's would work.? Metal film, carbon film, as long as the value is stable over time.
Best Regards,
Dave Wise
?
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From: hp_agilent_equipment@... on behalf of 'Thomas S. Knutsen' la3pna@... [hp_agilent_equipment]
Sent: Sunday, July 16, 2017 4:43 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: 141T reference replacement..a cure??
?
That link ain't gonna work, its to a file local on your computer!
FWIW, there is no metal film resistors in the 141T, but there is a lot of carbon film resistors! Those should not be mixed up, as their preformance is quite different.
BR.
Thomas.
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HP 8752C Calibration Issue - Help or Advice!
Hi all....I'm working on a 3 GHz 8752C network analyzer. It's like an HP 8753 but only does half of the S parameters. It has a Reflection port where the source comes out and a Transmission port where the output of the DUT would attach.
The issue is that it fails test 27 - Sys Ver Tests. It fails the Source Match (Trans Mode) test. I have replaced or moved all three samplers and replaced the coupler and source. None of these altered the failure. The trace always is about the same crossing the limit at about 600MHz and rising to about 12dB out of limit at 3 GHz.
I could use a better understanding of what the test is, and what affects it. So far, I have not been able to affect it much at all.
Note that all the adjustments were made and were successful. I have re-run test 53 - Freq Response Adj after every sampler change....
Help! help!
Dan in Chandler, AZ.
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Re: 141T reference replacement..a cure??
That link ain't gonna work, its to a file local on your computer!
FWIW, there is no metal film resistors in the 141T, but there is a lot of carbon film resistors! Those should not be mixed up, as their preformance is quite different.
BR. Thomas.
?
These tubes were designated as Z82R7. Spec sheet is at folowing link.
>>> file:///C:/Documents%20and%20Settings/Administrator/My%20Documents/Downloads/Signalite-Hivac%20neon%20regulators-LM317.pdf <<<
Who would think replacing this obsolete tube would cause such an upstir!
Dennis
--------------------------------------------
On Sat, 7/15/17, Jeremy Nichols jn6wfo@... [hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com> wrote:
Subject: Re: [hp_agilent_equipment] Re: 141T reference replacement..a cure??
To: hp_agilent_equipment@yahoogroups.com
Date: Saturday, July 15, 2017, 11:16 PM
There might be some NOS parts somewhere but
neither Google nor eBay brings up anything for "Signalite
82R7."
Jeremy?
On Sat, Jul 15, 2017 at
7:09 PM Doug dmcgarrett@...
[hp_agilent_equipment] <hp_agilent_equipment@yahoogroups.com>
wrote:
?
On 07/15/2017 05:00 PM, Bob Goodrich bobgoodrich84@...
[hp_agilent_equipment] wrote:
> Signalite 82R7
Wonder if it's still available. That was a l o n g
time ago!
--
4.
-- With Best regards, Thomas S. Knutsen.
?Please? avoid sending? me? Word? or? PowerPoint? attachments.
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David C. Partridge