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  1. HP-Agilent-Keysight-Equipment
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Re: Help to repair my HP654A Test Oscillator

 

¿ªÔÆÌåÓý

Almost certainly 50Hz AM modulation - 20msec per cycle. ?Does touching the 645 chassis change the amplitude of the modulation, if so check the chassis ground at the power cord input, you may have an open ground pin. ?If not check the power supplies for 50/100 Hz modulation, percentage of voltage of the supply, the worst looking supply is probably the culprit.
Don Bitters
Re: 8350B w/83590A repair advice

 

Mark:

Hi...Shift 92 and Shift 93 allow the RPG on the plug in to tune through some of the constants in the output tuning. See if you can find a number on the display that solves the output issues. be careful to test band edges and the high end at 20 GHz as these drop out when the mid of a band is peaked.

Really helps to have a network analyzer so you can see the whole power output vs frequency trace. In fact, I'd never attempt to align one of these plug-ins with out a network analyzer (scaler is fine.

The manual has instructions for aligning the A6, A7 abnd A8 card sets that run the YIG and YTO. I'd suggest you start with the -10V adjustment and do everything in order through FREQUENCY ACCURACY.

Dan in Chandler AZ
Re: 8350B w/83590A repair advice

 

On Sun, 15 Dec 2019, Paul Bicknell wrote:

Eh... As I said I have a fully working/refurbished/calibrated 83570A but
that is a single-band 18-26.5 GHz plug-in, not a wide range one.

As a matter of fact I would recommend to get several narrow-band plug-ins
instead of single all-over-the-range one. Those are much easier to
adjust/calibrate as they don't have to make compromises for very low ranges
and very high frequencies at the same time and they are simpler. At the very
least, if you want a full coverage from 10MHz to high GHz do _NOT_ buy a 20
or 26.5GHz plugins going down to 10MHz like e.g. 83592x ones. Better get a
same one _WITHOUT_ the lowest band (e.g. 83590x) and get a separate 83522A
for that lowest band.

Hi looking for a working 26.5 Ghz plug in for a 8350
Regards Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sergey
Kubushyn
Sent: 15 December 2019 01:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.
It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.
---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: 8350B w/83590A repair advice

 

meant "scan + post"

ug
Re: 8350B w/83590A repair advice

 

On Sun, 15 Dec 2019, Paul Bicknell wrote:

Put it on my web site at:



Not of stellar quality but pretty decent, with schematics, drawings, parts
lists and so on.

Hi do you have the service manual for the Wiltron 6669B
As I have a 6669A
Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sergey
Kubushyn
Sent: 15 December 2019 01:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.
It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.
---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: 8350B w/83590A repair advice

 

Hi Paul. I wish the scanned copy of this manual was better.
If I get a "real" one, I will sac and post.

mark
Re: 8350B w/83590A repair advice

 

¿ªÔÆÌåÓý

Hi Mark

?

You have to understand the history behind manuals and the gentleman¡¯s agreement we have with HP

A lot of the manuals on this HP site have been supplied by members of this group ?/ before? Groups IO

So if we get a better scan we can offer it to HP as a replacement

Hope you understand? Regards Paul ?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Mark Bielman
Sent: 15 December 2019 02:34
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

?

Hello Serge,

Good but somewhat discouraging info. Agree that the mainframe is straight forward and of no concern. But those plug-ins look problematic.
I have a service manual for the 83592 (in OK pdf) and the cal procedures are challenging, especially w/o specific (HP) test equipment.
Will do the best I can with what I have. Will check RF levels 1st to hopefully point to the affected block(s).

Hoping (mentioned previously) that the service manual I bought is the real thing. The Keysight one sucks.

Mark in Oregon
KJ7CYN

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: 8350B w/83590A repair advice

 

Hello Serge,

Good but somewhat discouraging info. Agree that the mainframe is straight forward and of no concern. But those plug-ins look problematic.
I have a service manual for the 83592 (in OK pdf) and the cal procedures are challenging, especially w/o specific (HP) test equipment.
Will do the best I can with what I have. Will check RF levels 1st to hopefully point to the affected block(s).

Hoping (mentioned previously) that the service manual I bought is the real thing. The Keysight one sucks.

Mark in Oregon
KJ7CYN
Re: 8350B w/83590A repair advice

 

Hi looking for a working 26.5 Ghz plug in for a 8350
Regards Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sergey
Kubushyn
Sent: 15 December 2019 01:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.
It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*






-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: 8350B w/83590A repair advice

 

Hi do you have the service manual for the Wiltron 6669B
As I have a 6669A
Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sergey
Kubushyn
Sent: 15 December 2019 01:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.
It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*






-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: 8350B w/83590A repair advice

 

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.
It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: 8350B w/83590A repair advice

 

No other plug-in right now. Not afraid of diving in. Work on HP stuff all the time.
These plug-ins look like a challenge in the way they are packed full.

Just noticed that the frequency is moving slightly (CW mode). Within a minute or two,
changes by 1 MHz or so... pretty large in my book. Did not notice at fisrt as my SA span
was large initially. Maybe the YTO or driver. Not sure what locks this in. Just the YTO current?

Have only had the unit 1/2 day so still troubleshooting. And hoping the manual I
ordered is not just a print of the pdf offered by Keysight, which is terrible.
Re: 8350B w/83590A repair advice

 

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which is the bad unit.
Re: Help to repair my HP654A Test Oscillator

 

Hi, over the weekend I spent some time to calibrate my 654A oscillator, as I was suggested to.
Beginning from pag. 5-12 of OP&Service manual, I did
1. POWER SUPPLY VOLTAGE ADJUSTMENTS -> OK
2. POWER SUPPLY REGULATION AND RIPPLE CHECK -> OK
3. FEEDBACK LEVEL ADJUSTMENT -> OK
4. DISTORTION ADJUSTMENT -> KO. I can't reach -46 dB in X100 range, even changing?A2R9*. On my distortion meter (UPA3 R&S) the best distortion I achieved was - 40 dB

I decided to go ahead anyway.

5. Frequency Dial and 1 K Range Adjustment -> OK
6.?X10 RANGE ADJUSTMENTS -> KO. This is the range where waveforms are bad (attached two pics as examples) but DIAL is AMAZINGLY calibrated as far as frequency is concerned. The frequency is Ok but waveforms are ugly, especially from 30 Hz to the end of the range.
Funny situation: at exactly 50 Hz (Mains frequency in Italy) the sine is perfect! I wonder if there may be a connection.

At this moment I completely lack any idea of how to overcome this issue. The other ranges are ok, both in level and frequenciy.

Any hints?


Thank you for your help.

Marco

I.jpg
II.jpg

Re: 2401C Integrating Digital Voltmeter and 2410B AC - Ohms Converter

 

Hi Terry -?

Yes, I believe that we did get the 'twin' 3460Bs that were listed a few years ago.

I guess whichever of us gets the time to do the boards will then have to share with the other.? I'll be happy to if I get to them first, for sure.? They're on my 'to reproduce' list, as I mentioned, and one of these years I'll get them laid out in OrCAD unless you get to it first.? I have the manual buried here somewhere, too, and anticipated working from the schematics and images therein.? All the more motivation now knowing are others who would benefit, too.? The option 29 sounds like a good one, too - go big or go home!

-Pat

On December 14, 2019 at 5:17 AM Terry Gains <terry.waihi@...> wrote:

Hey Pat,

What good fortune to find you here. On behalf of many, thanks for your photo essay on the?and other fine HP instruments. Your work is no-doubt preserved as the screen saver or desktop image of choice by many HP fans. Maybe your?2410B might get the same treatment one fine day?

If I recall correctly, we once bought?HP 3460B digital voltmeters from the same source?

Re: "I'll need to fabricate some boards to integrate them, though, as they weren't a set and the 2401C is not equipped with the boards needed to let it talk to the 2410B".
Magic! You might be speaking of the A9 Units Coupling and the A3 Delay Gate boards. I'm not expecting to find those installed when I open the 2401C and will need to look at getting some PBCs made to order and share them with folk like yourself.?

I'd also like to have Option 29 Frequency Measurement to 1.2 MHz, so this is another PCB to be ordered and shared. If you have to go to extent of making option 29, then you might as well look at pushing the frequency.?

Please let me know if you were thinking of additional options.

I'll be re-producing the PCBs from images using the service manual as a reference, so there's no telling how long this might take.

Re: "Gotta love a full rack width, 20+ inch deep, 13-1/2" tall nearly 100 lb stack of gear that will measure DC and AC voltage, and resistance.? One of these years, in my spare time (so called because I have so little of it...)? Cool old boat anchors - it's nice to know others are keeping them alive, too.".?
Absolutely. HP certainly believed this when placing them prominently in a number of late 60's advertisements.?




Hello Dave,

Thank you for taking the time to reply.

It's amazing to hear that you keep both a 2401C and an working order?2402A. I've never heard of a 2402A for sale, so you have an?ultra rare part of HP history on your hands. Well done. I've seen two 2410Bs and one?2410A?on eBay in the last ten years and was lucky enough to win a?2410B.


Some of my Christmas leave will be devoted to at least getting the?2401C?operational and recalibrated. That and reproducing some PCBs to interface the 2401C and 2410B.


I apologise for a quality of the picture below (1. I'm no Patrick Manning, and 2. it was taken with an old phone just now) but if you've never seen a?2410B, my?2410B is between the 2401C?and the 3460B?at the bottom.



Let's stay in touch.?If you ever want some options for the?2401C,?I'm looking at reproducing some.

Kind regards,
Terry
Re: 8350B w/83590A repair advice

 

Unit just arrived. Initial testing does not agree with original complaint: "Output at 2Ghz is -10db below what it should be. Won't produce a signal much past 10Ghz and at 10Ghz it is -30db below the RF output level setting. No output past this frequency"

Output is approximately 5 dB below stated level, from 2 to 20 GHz. At the AUX output, I measure also 5 dB low, or -5 dBm, rather than 0 dBm.

With the ALC disabled, output is around 18 dBm, which might also be low (not sure).

So it seems I'm about 5 dB low across the board. Maybe YIG output is weak OR perhaps the MOD/Coupler...?

At any rate, may not be as bad as expected.

Next, open 'er up!

Mark
Re: 2401C Integrating Digital Voltmeter and 2410B AC - Ohms Converter

 

Yeah, that's a rare one apparently - have had it in my evilbay watch list for years now with no hits other than an occasional manual for it.

-Pat

On December 14, 2019 at 12:05 PM Jeremy Nichols <jn6wfo@...> wrote:

Gentlemen,

There is also a 3461A, which is the AC-Ohms converter for the 3460A. It¡¯s the equivalent of the 2410, I believe. I¡¯ve never seen a 3461 outside of a catalog.

Jeremy?


On Fri, Dec 13, 2019 at 10:39 PM Patrick Manning < pbmanning@...> wrote:

I have also a set in the repair queue.? My 2401C sounds to be a bit older than yours, Terry, as it's the Dymec-labeled version, s/n 622-01154.? The 2410B is 644-01052, and despite having a lower serial number than yours, mine has an HP-labeled front panel.

I'll need to fabricate some boards to integrate them, though, as they weren't a set and the 2401C is not equipped with the boards needed to let it talk to the 2410B.

Gotta love a full rack width, 20+ inch deep, 13-1/2" tall nearly 100lb stack of gear that will measure DC and AC voltage, and resistance.? One of these years, in my spare time (so called because I have so little of it...)? Cool old boat anchors - it's nice to know others are keeping them alive, too.

Some photos of the 2401C are at?

-Pat

On December 13, 2019 at 6:37 PM Terry Gains < terry.waihi@...> wrote:

Who here, runs these find beasts?

My HP 2401C Integrating Digital Voltmeter (SN 811-02807 opt 21,31,146) and HP 2410B AC - Ohms Converter Dymec (SN 644-01126) are about to be restored, interconnected and calibrated.

They don't appear to have been mentioned in this forum before, but I'm betting someone out there is also keeping these in working order.

Incidentally, they are both in pristine condition, remarkable for their age, and the?2410B has a asset sticker from a previous owner, the NASA? Goddard Space Flight Center, which will be left on the instrument.?

Kind regards,
Terry

?

?

--
Jeremy Nichols
6.

Re: 8350B w/83590A repair advice

 

True my manual and equipment are 83592c, but that leaves still the YTM as a cause
Re: Does anyone have any PIC17C42A-16I/L to spare (ideally in UK)

 

Hi David,

Avnet (AKA Farnell these days?) claim to be able to get the PIC17C42A-25I/L (44 pin, -40 +85, 25 MHz part) in 4 weeks with an MOQ of 1 at ~11 Euro but other than that - as I guess you found - all the usual suspects can still get them for half that amount but with an MOQ of 108!

A caveat though, I have ordered oddball parts (ie panel-mount encoders for HP 66xx series system power supplies) from Avnet in the past and they do eventually arrive but in 4/6 times the initially quoted leadtime!

Adrian

On 12/14/2019 6:08 PM, David C. Partridge wrote:
Extended temperature range PIC17C42A version in PLC44 ...

Thanks David
Re: Dead 54720D

 

So far, no cigar. Simply changing the string from 54712A to 54717A leads to an "Unknown" module detection. There's some checksum involved, I need to look close to that binary. I've uploaded the 54712A_EEPROM.bin in the file area /g/HP-Agilent-Keysight-equipment/files/54712A_EEPROM.bin in case somebody else wants to take a look.
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