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Re: Old style oval HP power cords

 

Like others, I prefer to change these to regular IEC sockets and plugs on gear that I expect to keep for a long time. It's not too difficult to make the conversion. mostly needing a nibbling tool, a drill, and some files. That is, if there's enough room (panel area, depth, and clearance to internal parts). I think I've only had the space problem on a couple of pieces over the years, where you just have to leave it original. Another option is to just delete it and hard-wire a cord with a Heyco or grommet type attachment - the most compact and simple form of all. I prefer detachable, but I have plenty of gear that came with those dangling cords anyway, so it's not that big a deal.

I have a few of these old cords I keep for testing, and for a few pieces of gear that use them, until their turn comes up to get converted. My most recent was a HP741A, which had plenty of area, but the connector had to penetrate the outer cabinet and inner isolated shield structure, only contacting the right parts, so it was a bit tricky to work it over and get the required clearances. I always try to do it without major disassembly, relying on tricky methods instead.

Ed
Re: Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )

 

On 1/3/24 09:42, gren wrote:
-? Does anyone have a?? spare,? good condition ? or?? NOS? hp Oval receptacle ?
This one's in good shape. If you can stand the extra parts that come with it. $15 incl postage.
--
John

HP-oval-receptacle.jpg

Re: Wtb: power switch for 3335A or front panel

 

Edit: clarification¡­the aluminum casting is the panel part other than the switch that I need, as there is a chunk missing from the edge of mine. For a reasonable price I don¡¯t mind buying a whole panel and paying it forward and providing switches or keys to others cheap or free from the one it replaces.
Wtb: power switch for 3335A or front panel

 

I have a 3335A with a broken power switch. I have the key cap, and just need a compatible switch or for a reasonable price, a front panel. Does anyone have something around they¡¯d like to part with?

I¡¯m in Minnesota (US) and I can provide a prepaid shipping label you can print and tape to a box to make it quick and easy.
Re: Old style oval HP power cords

 

After you set up your pins/sockets on a nice new power cord, you can then use hot glue all around them to mold a new plug.? Coat the receptacle with a bit of grease for form release first, inject, let the hot glue solidify and then unplug your new cord....? Fairly safe, easy way to replicate unobtanium sockets for tubes, other things such as PMTs, etc.

On Wed, Jan 3, 2024 at 1:36?PM Jeremy Nichols <jn6wfo@...> wrote:
I have, in an emergency, crimped individual Molex-style female pins to the power cord wires, added shrink-tubing insulation, and then pushed the female pins onto the male pins of the connector in the HP chassis. This obviously requires knowledge of which wire goes to which pin, and I'd be nervous about letting anyone other than myself use that equipment¡ªbut it does work. I suppose you could also cast or 3D print a plug to surround those pins, thus duplicating the lost original cord.

Jeremy
N6WFO


On Wed, Jan 3, 2024 at 9:44?AM Greg Muir via <big_sky_explorer=[email protected]> wrote:

If you have the power cords with reversed hot/neutral that were commonplace for use on Friden calculators simply cut off the AC plug end and install a new one wired in reverse.? I seriously doubt if anyone will take the time to disassemble the cord and look for wire color errors in regards to the modification.

?

Simplicity at its best.

?

Way back when the word was starting to circulate that Belden was going to discontinue manufacturer of these cords I made a quantity buy.? And at that time the amount of HP and other equipment that was coming onto the surplus market was rife with these style power receptacles. Over the 45 years or so I have slowly eaten up the supply and now have only a couple left.? But the ~$6 per cord at that time was easy on the pocketbook.

?

Use of a modified IEC power cord is rather Draconian given the mis-fit of the round versus flat contacts.? Brute force when mating such an arrangement will most probably result in damage to the contacts or even break them away from their mounting inside the equipment receptacle.

?

Greg
Re: Old style oval HP power cords

 

I have, in an emergency, crimped individual Molex-style female pins to the power cord wires, added shrink-tubing insulation, and then pushed the female pins onto the male pins of the connector in the HP chassis. This obviously requires knowledge of which wire goes to which pin, and I'd be nervous about letting anyone other than myself use that equipment¡ªbut it does work. I suppose you could also cast or 3D print a plug to surround those pins, thus duplicating the lost original cord.

Jeremy
N6WFO


On Wed, Jan 3, 2024 at 9:44?AM Greg Muir via <big_sky_explorer=[email protected]> wrote:

If you have the power cords with reversed hot/neutral that were commonplace for use on Friden calculators simply cut off the AC plug end and install a new one wired in reverse.? I seriously doubt if anyone will take the time to disassemble the cord and look for wire color errors in regards to the modification.

?

Simplicity at its best.

?

Way back when the word was starting to circulate that Belden was going to discontinue manufacturer of these cords I made a quantity buy.? And at that time the amount of HP and other equipment that was coming onto the surplus market was rife with these style power receptacles. Over the 45 years or so I have slowly eaten up the supply and now have only a couple left.? But the ~$6 per cord at that time was easy on the pocketbook.

?

Use of a modified IEC power cord is rather Draconian given the mis-fit of the round versus flat contacts.? Brute force when mating such an arrangement will most probably result in damage to the contacts or even break them away from their mounting inside the equipment receptacle.

?

Greg
Re: Old style oval HP power cords

 

If you have the power cords with reversed hot/neutral that were commonplace for use on Friden calculators simply cut off the AC plug end and install a new one wired in reverse.? I seriously doubt if anyone will take the time to disassemble the cord and look for wire color errors in regards to the modification.

?

Simplicity at its best.

?

Way back when the word was starting to circulate that Belden was going to discontinue manufacturer of these cords I made a quantity buy.? And at that time the amount of HP and other equipment that was coming onto the surplus market was rife with these style power receptacles. Over the 45 years or so I have slowly eaten up the supply and now have only a couple left.? But the ~$6 per cord at that time was easy on the pocketbook.

?

Use of a modified IEC power cord is rather Draconian given the mis-fit of the round versus flat contacts.? Brute force when mating such an arrangement will most probably result in damage to the contacts or even break them away from their mounting inside the equipment receptacle.

?

Greg
Re: Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )

 

Note that these were made in grounded and ungrounded versions, there are a few that used the ungrounded variant with an inductor to the case, the 331A is one example.

Also they are used for many other brands of test equipment in the 1960s, not just HP.

David
Re: HP8510B Reading and writing A13 EEPROM, problem with Xicor x28256

 

Hi Bruce,?

Thanks for the offer! Much appreciated, but what I really would like is to make sure I write to the EEPROMs?correctly. Is your impression that all writes work immediately or do you have to do repeated writes in order for the FW to be correctly entered?

I believe you have some of Wayne's documentation, and possibly also the code he used for writing to the x28256 EEPROMs? It would be great if you could upload this here to have a look at.?

I think I'm fairly close to having working code - only a few ICs won't accept data properly. Possibly the code is OK and I only have some bad ICs.

My goal is to make sure I have a working solution and I can then upload this code for anyone to use. It would then be possible to read/write the A13 EEPROMS using an Arduino MEGA2560 and DuPont cables only.?

Regards,
? Staffan
Re: Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )

 

I have a used one - good condition - that you can have.

Thanks,
Barry - N4BUQ

From: "gren" <hrgerson@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Wednesday, January 3, 2024 10:42:18 AM
Subject: [HP-Agilent-Keysight-equipment] Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )
I have the opposite problem:

I have an instrument where the Old hp Oval Receptacle has disintegrated due to misuse or time.
It is so bad that it causes intermittent AC mains issues and is on the verge of shorting.

-? Does anyone have a?? spare,? good condition ? or?? NOS? hp Oval receptacle ?

thank you,
rick?

Re: Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )

 

That is a PH-163 connector. Here's one:



Paul

On Wed, Jan 03, 2024 at 08:42:18AM -0800, gren wrote:
I have the opposite problem:

I have an instrument where the Old hp Oval Receptacle has disintegrated due to misuse or time.
It is so bad that it causes intermittent AC mains issues and is on the verge of shorting.

-? Does anyone have a?? spare,? good condition ? or?? NOS? hp Oval receptacle ?

thank you,
rick







!DSPAM:65958e70136296053426310!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
Opposite problem: disintegrating Old style Oval HP Receptacle ( ... was Old style oval HP power cords )

 

I have the opposite problem:

I have an instrument where the Old hp Oval Receptacle has disintegrated due to misuse or time.
It is so bad that it causes intermittent AC mains issues and is on the verge of shorting.

-? Does anyone have a?? spare,? good condition ? or?? NOS? hp Oval receptacle ?

thank you,
rick?
Re: Old style oval HP power cords

 

On Tuesday 02 January 2024 01:32:46 pm Dave McGuire wrote:
On 1/2/24 13:26, John Griessen wrote:
On 1/2/24 09:57, Paul Amaranth wrote:
> I did run across a post from Dale Cook where he says you can often shave
> down a standard IEC cord to fit and it will have the correct
configuration.

On 1/2/24 11:08, Paul Amaranth wrote:
I just tried this, and not well.
Oh well, square hole, round peg...
Back to filing and drilling.
Are people really having such a difficult time finding the proper
cables? They do show up from time to time. I've never had much trouble
getting them when needed. It sure beats all this hacking about.
I know that I haven't seen them around for a good long time. OTOH I have a big box of the more standard ones around here, including a few variations in color, some right angle, etc. I *may* have one of those older style ones somewhere, I'm not sure. I am sure that I don't have anything here that uses them. Some time back I had a guy who was looking for one, offered me $40 for one that I had, and I sent it off to him. That one might have been for a music synthesizer, I'm not sure any more.

The two configurations of those is bothersome as well.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Re: HP8510B Reading and writing A13 EEPROM, problem with Xicor x28256

 

If you wind up needing help, I can write a good Eprom for you

Cheers!

Bruce
HP 54522A Firmware Re-flash Error

 

Hi,

I'm getting an error when I try to re-flash the firmware from disk on my HP 54522A oscilloscope that I purchased a year ago. The scope has been working fine for a year and started giving me trouble during the boot up check. I replaced the lithium nonvolatile ram battery and while trying to re-flash the latest firmware from the disk, I get an error during the update. The ROM image flashes successfully but after the re-flash of the System image I receive the following Message stating "Updating From File: System Failed: 4, 15, 38982". I'm wondering if this is indicating a bad flash Rom IC. Any help would be appreciated. Note: The disk read of the System image file reads successfully during the re-flash but fails on the writing to the Flash Rom (Attached picture shows error results).

Thanks in advance
DanV Fenton,MI
Re: Old style oval HP power cords

 

Hello and happy new year to the group.
I have a number of older HP test gear that has the small 3 pin cords and also have the correct cords. What I am seeing is the typical 40 year plus plastic/rubber degradation setting in.
When buying cords ask the seller the condition of the cord. You may not be happy with what you receive.
As far as changing things out it really is quite the pain. Maybe after you do a few and are committed to the effort it gets easier.
Suspect one way or another I will become an expert. Not to excited.
Regards
Paul
WB8TSL
Re: Agilent E4406A / 16700 CPU issue

 

I am not sure if this will help but my E4406A had a black screen after
power on. I removed the 2 daughter boards on the motherboard (flash
board and additional RAM board).

After this, the E4406A started. I added back the flash board and it also
worked and booted correctly the OS.

After this I added the RAM board back and again black screen. I
inspected the RAM board and I have seen on the backside some dirty area,
looks like something burned the traces near one of the connectors. I
didn't manage to fix it since I don't know where the traces should go
but now my E4406A works fine without the extra memory.

The CPU board uses a PA-RISC CPU and a stripped down version of HP-UX.

Another issue with these devices is the fan board which has some caps
failing. From what I remember it can also prevent booting and behaves
strange.

EEPROM from what I know, it has only calibration data and maybe the
ID/Model/SN of the unit but this should not prevent booting if damaged.

On 03/01/2024 09:49, Board via groups.io wrote:
The crystal and clock is fine. I measured 150 MHz on the clock generator
IC, which is the correct frequency. The ROM is soldered to the board,
and desoldering it would be a pain. I have a programmer but I'd need to
get the boot ROM code (which I can't find anywhere) and the socket.
_._,_._,_
------------------------------------------------------------------------
Re: HP8510B Reading and writing A13 EEPROM, problem with Xicor x28256

 

Hello,

Good points. I checked voltage and noticed only approx 20 mV drop during access to the ICs. Only checked one of the ones that were successful in writing. Will check the other ones also. Away from my lab right now so it will take a few days though.
Being an HP design of the 1980-ies, I would expect those issues to be taken care of, but perhaps a failing cap?

All signal lines to the EEPROMS are buffered on the board by the way and the Arduino seems to output levels well within TTL requirements.

I'm thinking if there is something with the IC itself, but wonder if there is really anything that can degrade from age? It is not that the complete IC is dead, but rather just bytes are off.

I know people have updated the firmware, but not sure if this was an immediate success or if this kind of behaviour is common - hoping there may be a workaround...

Regards,
? Staffan?
Re: Agilent E4406A / 16700 CPU issue

 

The crystal and clock is fine. I measured 150 MHz on the clock generator IC, which is the correct frequency. The ROM is soldered to the board, and desoldering it would be a pain. I have a programmer but I'd need to get the boot ROM code (which I can't find anywhere) and the socket.?
Re: 00105-6013 HP crystal oscillator wanted

 

On Tue, Jan 2, 2024 at 01:54 PM, J. L. Trantham wrote:
Thanks very much for the link. It's exactly what I was looking for!

Morris
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