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HP 5356 B or C frequency converter for 5345A parts needed

 

I am looking for a 5356B or C parts unit.? Working condition not important, but I'd like the connector and possibly the case to be recoverable.? Don't care about the cable.

Anybody have anything they want to get rid of?
Re: HP 3585B Spectrum Analyzer How to start diagnosing "No Horizontal sweep" problem

 

There is a fuse inside the unit on one of the boards. It supplies 12v to the horizontal oscillator. If your flyback is bad, that fuse will blow and you will have no display on the CRT. The board is accessible from the bottom so you will have to flip the unit onto its side to access it. I took my flyback out and ring tested it to verify. It failed. I think a good one has around 300 ohms DCR on the HV winding with smaller and smaller values as you move down the taps from the HV to the bottom. My bad one checked around a meg or more.?
Re: HP 3585B Spectrum Analyzer How to start diagnosing "No Horizontal sweep" problem

 

Do you have an XY monitor? There is video out connectors on the rear of the unit which you can use to obtain video. You can also probe those with an oscilloscope to check for a video waveform if nothing else. Iirc the rear XY signal is a separate signal chain from the main signal driving the display.
I have the 3585B and I use it very frequently. It’s a very good SA for doing work below 40m. I’ve had to do two repairs to mine so far. The display board, A67 I believe, had shorted tants on one of the power rails, the -15v I believe. That was an “easy” fix. The second repair occurred when the flyback transformer suffered a short on the secondary side. That one was a bit more painful as it required a bit of cash for replacement parts. Although that failure was not terminal as, like I mentioned, I had video from the rear ports making it somewhat usable albeit without the graticule. The manual has very good troubleshooting guides. I’d recommend getting familiar with it.
Request HDD image for Agilent Infiniium DCA 86100C mainframe

 

Hi guys!
Can anyone share the disk image for the 86100C?
This mainframe runs on Windows XP.

I have a disk image for the 86100A based on Windows 98 and I'm ready to share if anyone needs it.

Alex.
Re: Requesting HP 33120A VFD

 

yeah I already found some on?eBay for the entire front panel assembly.?
I was hoping someone?had just the VFD to spend a little less money.
(Believe or not but I had already?change the front panel assembly years ago, that time it fells from my workbench?table and broke the VFD)

Il giorno dom 28 apr 2024 alle ore 20:15 Ctron5890 via <apolentini=[email protected]> ha scritto:
Keysight lists this part as obsolete and cannot be purchased. Keep a lookout on eBay and pick up a front display assembly or low cost parts unit (hard to do these days).?

[rant on] Keysight has obsoleted more and more parts + restricted parts to service only. They want us to pay 3X the cost of a unit for them to just put eyes on it by their service techs. Just pushes loyal users away in my opinion [rant off]



--

Alberto Vaudagna
Re: Requesting HP 33120A VFD

 

Keysight lists this part as obsolete and cannot be purchased. Keep a lookout on eBay and pick up a front display assembly or low cost parts unit (hard to do these days).?

[rant on] Keysight has obsoleted more and more parts + restricted parts to service only. They want us to pay 3X the cost of a unit for them to just put eyes on it by their service techs. Just pushes loyal users away in my opinion [rant off]
Re: 5342A: sometimes counts, sometimes not

 

Acording to service manual, divide-by-N circuitry are ok. Found faulty component: U2 in A10, a phase detector (Motorola MC4044P). It has two inputs, divide by N signal which is present and changing period acording to CF in manual mode; and a reference input, fixed 50 kHz pulse, ok too. It's outputs are intermitent, so I think it is the faulty component which prevents A9 to sweep the synthesizers properly

I'll order new IC and try it out

Regards,
搁耻产é苍

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Re: 8711B tantalum disease

 

One was a 20 volt part on a 15 volt rail.? The other was a 10 volt part (!) on a 12 volt rail.

I replaced both with 35 volt parts.

Nice that the power supplies have current sensing and shut everything down when a tantalum shorts.? So many pieces of equipment don't have that and end up burning holes in boards.

Peter

On 4/28/2024 12:56 PM, Roy J. Tellason, Sr. via groups.io wrote:
On Saturday 27 April 2024 08:24:59 pm Mark Weedon wrote:
Peter,
I agree - tantalums are a pest.? Perhaps the problem isn't the tantalums but our fascination with equipment from the dodgy tantalum era.? We can replace tantalums, dried electrolytics, leaky backup batteries etc but who really wants to cure that fascination?
The tantalums exposed to immediate voltage at turn on are the most likely to fail. Those in timing circuits, charged via a resistor seem to be OK.
My impression is that the ones that fail are those that have voltage applied to them which is close to or at the part's rated voltage. One instrument that I'm familiar with used a *lot* of parts rated at 25V in a circuit that might under some conditions put 30V across them. Yes, there were failures...
Re: 8711B tantalum disease

 

On Saturday 27 April 2024 08:24:59 pm Mark Weedon wrote:
Peter,
I agree - tantalums are a pest.? Perhaps the problem isn't the tantalums but our fascination with equipment from the dodgy tantalum era.? We can replace tantalums, dried electrolytics, leaky backup batteries etc but who really wants to cure that fascination?
The tantalums exposed to immediate voltage at turn on are the most likely to fail. Those in timing circuits, charged via a resistor seem to be OK.
My impression is that the ones that fail are those that have voltage applied to them which is close to or at the part's rated voltage. One instrument that I'm familiar with used a *lot* of parts rated at 25V in a circuit that might under some conditions put 30V across them. Yes, there were failures...

--
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
HP3336C micro controller board

 

Is board 03326-66516 a replacement/upgrade from board 0336-66505?
Thanks
--
Joe White
KW4YW
Re: Agilent E4404B Spectrum Analyzer With Dead PSU Repair

 

Update, the unit powers on. But now is showing other errors.
I will create a new thread
Re: 5342A: sometimes counts, sometimes not

 

Following steps on service decission tree: it seems to have proper signal forms and values. As you see in the photos of my scope, signals described in the service captures attached are present, but no continously. Then the A9 board is working properly, because when reset the unit, that sawtooth-like waveform is continous for a split second. Thus, entering center frequency manually and playing with [RESET] button, the counter start counting.

A big relief that the sampler is ok. That's for sure.

I think the problem is in the A10 (phase detector/divide-by-N assembly) because the delta phase signals 1 and 2 are not continous.

If you have a 5342A and can measure TP1 at A9 for me to confirm that sawtooth must be continous while the unit is sweeping the synthesizers, would be very helpful ;)

Regards

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54620C not booting

 

My 54620C logic analyzer refused to start up after 20+ years of storage, with a suspiciously bulging M48Z08 zero-power RAM.
?
So I bit the bullet and removed the 48Z08, any data therein would be lost years ago anyway.
Lo and behold: the thing boots without any RAM, letting me know that the checksum failed and defaults were loaded instead. And being very unoperable after that: no trace, no menu, no nothing, just a rudimentary screen with a few divider lines...
Although not operable, this does tell me that there is no critical calibration data in there; please correct me if I'm mistaken here (and provide a solution).
?
I'm currently in the process of freeing the 48Z08 from its hat to see if there is a hack to be done with stuff from the junkbox.
Unfortunately, in an (ongoing) cleaning spree I just recently sold off all my SRAM chips: Murphy strikes again...
?
I see many adapter and conversion solutions, even new M48Z08 chips, but all too expensive to my taste.
Maybe someone can point me to an inexpensive ($10 max) plug-in solution...

Re: Modifying IC socket

 

开云体育

I did the NewScope LCD upgrade on my 85662A, 8757A, 8510C, and a beta test version on an 8510B. They are excellent upgrades, especially as one’s eyes get a little older. I don’t recall my 85662A having the little red clip, no idea when or why it might have been removed.?
No financial interest, just a beta tester and happy customer.?
Steve
WB0DBS
EM17iq09ao


On Apr 28, 2024, at 5:41?AM, Adrian Nicol via groups.io <Adrian@...> wrote:

? Glad you solved it!
Be interested to see what you think of the NewScope kit - I'm thinking of swapping out the slightly dim CRT display in my 8510C for a NewScope-7C

On 28/04/2024 11:00, Lou Blasco wrote:
Ooops, picture



Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 8:00?PM Lou Blasco <vk3alb@...> wrote:
Thanks Adrian, you got me back on track.

I did try bending the clips inwards but it wasn't enough. Thinking on your advice, with a dental tool I was able to get some leverage below and the clip lifted out on one side. It was then obvious the two small posts were all that was holding it in place.

Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 7:36?PM Adrian Nicol via <Adrian=[email protected]> wrote:
Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath?
Most likely just small ears catching under each end of the socket - have you tried simply gently pushing the end of the clip inwards or using a small screwdriver to lever the bottom of the red clip outwards?

On 28/04/2024 10:21, Lou Blasco wrote:
Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?


Regards

Lou
VK3ALB

Attachments:


Attachments:
Re: Modifying IC socket

 

开云体育

Glad you solved it!
Be interested to see what you think of the NewScope kit - I'm thinking of swapping out the slightly dim CRT display in my 8510C for a NewScope-7C

On 28/04/2024 11:00, Lou Blasco wrote:

Ooops, picture



Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 8:00?PM Lou Blasco <vk3alb@...> wrote:
Thanks Adrian, you got me back on track.

I did try bending the clips inwards but it wasn't enough. Thinking on your advice, with a dental tool I was able to get some leverage below and the clip lifted out on one side. It was then obvious the two small posts were all that was holding it in place.

Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 7:36?PM Adrian Nicol via <Adrian=[email protected]> wrote:
Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath?
Most likely just small ears catching under each end of the socket - have you tried simply gently pushing the end of the clip inwards or using a small screwdriver to lever the bottom of the red clip outwards?

On 28/04/2024 10:21, Lou Blasco wrote:
Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?


Regards

Lou
VK3ALB

Attachments:


Attachments:
Re: Modifying IC socket

 

Ooops, picture

image.png

Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 8:00?PM Lou Blasco <vk3alb@...> wrote:
Thanks Adrian, you got me back on track.

I did try bending the clips inwards but it wasn't enough. Thinking on your advice, with a dental tool I was able to get some leverage below and the clip lifted out on one side. It was then obvious the two small posts were all that was holding it in place.

Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 7:36?PM Adrian Nicol via <Adrian=[email protected]> wrote:
Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath?
Most likely just small ears catching under each end of the socket - have you tried simply gently pushing the end of the clip inwards or using a small screwdriver to lever the bottom of the red clip outwards?

On 28/04/2024 10:21, Lou Blasco wrote:
Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?


Regards

Lou
VK3ALB

Attachments:
Re: Modifying IC socket

 

Thanks Adrian, you got me back on track.

I did try bending the clips inwards but it wasn't enough. Thinking on your advice, with a dental tool I was able to get some leverage below and the clip lifted out on one side. It was then obvious the two small posts were all that was holding it in place.

Regards

Lou
VK3ALB


On Sun, Apr 28, 2024 at 7:36?PM Adrian Nicol via <Adrian=[email protected]> wrote:
Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath?
Most likely just small ears catching under each end of the socket - have you tried simply gently pushing the end of the clip inwards or using a small screwdriver to lever the bottom of the red clip outwards?

On 28/04/2024 10:21, Lou Blasco wrote:
Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?


Regards

Lou
VK3ALB

Attachments:
Re: Modifying IC socket

 

开云体育

Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath?
Most likely just small ears catching under each end of the socket - have you tried simply gently pushing the end of the clip inwards or using a small screwdriver to lever the bottom of the red clip outwards?

On 28/04/2024 10:21, Lou Blasco wrote:

Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?


Regards

Lou
VK3ALB

Attachments:
Modifying IC socket

 

Hi all,

I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone?know of a way to remove the red retainer clip without damaging?or desoldering the socket ?

image.png

Regards

Lou
VK3ALB

Re: Agilent E4404B Spectrum Analyzer With Dead PSU Repair

 

Exiting update, I managed to fix the PSU.

The problem was the LM339 comparator. Its output pins were connected to the LT1121 regulator reset pin and was what causing the problem.
Replaced it and the reset problem is gone, no more clicking sound and all the secondary voltage rails measured correctly.
I'll reassemble the PSU tonight and see if it works correctly when connected to the rest of the instrument.
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