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Re: Part Needed Ge Diode HP 1910-0016

David C. Hallam
 

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This part is used in a HP 606B signal generator in the A4 oscillator amplifier assembly.? It's in the cathode circuit of the differential amplifier.? The differential amp provides a DC signal to the output meter for each step of the output attenuator depending upon the setting of a level control potentiometer.? I'm shaky on the the operation of this circuit but it seems that this diode sets the cathode bias on the 6AW8A differential amp.

David
KW4DH

On 2/23/2016 1:33 PM, edbreya@... [hp_agilent_equipment] wrote:
?

What is the function of this diode in the circuit? If it's just a rectifier or low speed signal diode, you should be able to replace it with silicon easily, or with a Shottky diode or rectifier if particularly low forward voltage is needed.

Ed


-- 
The very essence of a free government consists in considering offices as public trusts, 
bestowed for the good of the country, and not for the benefit of an individual or party.
John C. Calhoun 1835
Re: Part Needed Ge Diode HP 1910-0016

 

What is the function of this diode in the circuit? If it's just a rectifier or low speed signal diode, you should be able to replace it with silicon easily, or with a Shottky diode or rectifier if particularly low forward voltage is needed.

Ed
Part Needed Ge Diode HP 1910-0016

David C. Hallam
 

Is there a commercial/milspec equivalent for the HP 1910-0016 which is listed as a Ge diode 100mA/0.85V 60 PIV. Sphere has them @ $6 each, but the shipping from Canada is so expensive. This part is not listed in their cross reference of HP parts.

David
KW4DH

--
There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement.
If the result is contrary to the hypothesis, then you've made a discovery.
Enrico Fermi


--
The very essence of a free government consists in considering offices as public trusts,
bestowed for the good of the country, and not for the benefit of an individual or party.
John C. Calhoun 1835
Re: HP3585A repair of RAM board

 

On Tue, Feb 23, 2016 at 5:56 PM, multanova@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:


I replaced both SN74S02N and SN7410N by new ones and everything went back to normal.


However strange.... suddenly 2 IC's dead together. I must say the boards were quite dusty

and perhaps it might be due to dust and moist that these died....that still puzzles me.
I don't know that particular schematic, but I always try to test logic
ICs out of circuit after I remove them, to be sure I'm not missing
something else bad into the board I'm repairing.
Indeed a double fault is strange, unless for some reasons, the first
fault caused the second.
I once replaced a 7406 with a small hole in the case, all internal
gates but two were still working :-)

Best regards
Frank IZ8DWF
HP3585A repair of RAM board

 

Hi all readers,


Just wanted to inform that I have managed to repair my HP3585A 40 MHz spectrum analyzer?

with :?

keyboard no reaction (all LEDS lit) and no display on CRT.


Following the manual Fault instruction tree to section C (processor and RAM /ROM debug).

I had no signature analyzer nor extension boards, so not at all straightforward to?proceed.

After some debugging with RAM and ROM boards removed, the processor board looked OK but?

RAM refresh lines became dead after I reinserted the RAM board. Apparently some lines?

(clock and refresh LSTM) were shorted to earth by a malfunctioning input structure of a NOR?

gate.I could see with an oscilloscope that U35 and U36 (RAM board) were completely dead and the?

gate outputs were at approx. 2.5V iso pulsing between 0 or 5V.

I replaced both SN74S02N and SN7410N by new ones and everything went back to normal.


However strange.... suddenly 2 IC's dead together. I must say the boards were quite dusty?

and perhaps it might be due to dust and moist that these died....that still puzzles me.


Now I get a CAL error 28 however I have a small error in amplitude only. So I will proceed?

to solve this. Possibly some contact resistance increase in one of the input attenuator?

relays but clearly a minor issue....


Only to say that one better not give up too early on a complex malfunctioning and a ?

signature analyzer and extension ?boards are not always necessary. Guess my HP3585A is ?

quite an early model (no 1750A00558) from end of the seventies...however the CRT is still in great condition.

Of course I was lucky none of the critical components such as the uP or ROM's were?damaged.


I am quite happy I got this magnificent instrument back to work.


regards?

from Felix
Re: Part Needed

 

A small OT hint: The same goes for the output amplifier in the old 8640B.
I replaced that one with a MiniCircuit MMIC. Had to disconnect
the +40V and use an external voltage regulator though.
Just watch up for PSU ripple.

Ulf - SM6GXV
Re: Part Needed

 

Maybe more suitable NEC UPC1654 but still rolls off rapidly above 1.1GHz. You could try your luck with recently discussed China sourced products. :(

Dennis



--------------------------------------------

On Tue, 2/23/16, g4gjl@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: Re: [hp_agilent_equipment] Re: Part Needed
To: hp_agilent_equipment@...
Date: Tuesday, February 23, 2016, 11:19 AM


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I believe this device is a GPD from the AVANTEK range in the
late 1970s and early 80s.?
See datasheet at:
?
There were three and four pin
devices made as the datasheet shows. Does this help in
identifying the device?
PeteG4GJL
Re: 8594e front panel buttons not responding

 

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IIRC, the 859x series uses the rubber membrane style keyboard, Peter.? I¡¯m still betting on a disconnect at the keyboard end.? At least most of the keyboards are fairly easy to access.

?

Daun

?

Daun E. Yeagley, II, N8ASB

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Tuesday, February 23, 2016 11:34 AM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] Re: 8594e front panel buttons not responding

?

?

I assume you checked the power supplies with a ¡®scope?

I have some spare buttons and springs for other front panels. I will check, contact me off line.

PeterB

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: February-23-16 11:24 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8594e front panel buttons not responding

?

?

From the manual, hitting [CONFIG] [(LOCAL)] should bring it back to local if it's it remote mode, and [CONFIG] does nothing, so I don't think that's it.

I think Daun is correct, the keyboard is defective or disconnected.? The cable seems intact at the CPU end, so now I'll have to disassemble the front panel.

Dave
Re: 8594e front panel buttons not responding

 

¿ªÔÆÌåÓý

I assume you checked the power supplies with a ¡®scope?

I have some spare buttons and springs for other front panels. I will check, contact me off line.

PeterB

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: February-23-16 11:24 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8594e front panel buttons not responding

?

?

From the manual, hitting [CONFIG] [(LOCAL)] should bring it back to local if it's it remote mode, and [CONFIG] does nothing, so I don't think that's it.

I think Daun is correct, the keyboard is defective or disconnected.? The cable seems intact at the CPU end, so now I'll have to disassemble the front panel.

Dave
Re: 8594e front panel buttons not responding

 

From the manual, hitting [CONFIG] [(LOCAL)] should bring it back to local if it's it remote mode, and [CONFIG] does nothing, so I don't think that's it.

I think Daun is correct, the keyboard is defective or disconnected.? The cable seems intact at the CPU end, so now I'll have to disassemble the front panel.

Dave
Re: Part Needed

 

I believe this device is a GPD from the AVANTEK range in the late 1970s and early 80s.?

See datasheet at: ?http://www.rf-microwave.com/en/shop/0/393-high-performances-professional-mmic/4168-GPD-401.html

There were three and four pin devices made as the datasheet shows. Does this help in identifying the device?

Pete
G4GJL
Re: 8594e front panel buttons not responding

 

¿ªÔÆÌåÓý

Part of the IEE-488 standard was a function called ¡°local lock out¡±? (LLO) which does prevent local operation or even going to local (GTO), but I don¡¯t recall that it survives a power cycle.

?

Daun

?

?

?

Daun E. Yeagley, II, N8ASB

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Tuesday, February 23, 2016 10:40 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8594e front panel buttons not responding

?

?

From memory, doesn't this thing have a 'Hold' function key that locks out the keys, keypad and encoder knob? It hasn't got stuck in that mode somehow has it?
HP 8355X mm wave module with HP 8673B/C/D signal generator

 

Hi,

The HP 8355X millimeter-wave source module is used with an HP 8673B/C/D signal generator and an HP 8349B amplifier to generate mm wave signals. The manual notes that the 8355X requires the signal generator to have an output of 0.5V / GHz. The manual also notes that early models of these signal generate 1V / GHz and they must be modified with a retrofit kit to change this to 0.5V / GHz. For example, the retrofit kit for the 8673B is P/N 08673-60130.

As I assume these retrofit kits are not available, does anyone know details of what they contain and how they are to be installed?

Thanks!

Ray VE3FN
Re: Part Needed

 

Hi David,


I was able to review the MAR-3+ MMIC datasheet, and I believe that I may need an add-on board. I posted some pictures of the 5335A A9 board, especially in the vicinity of the U1 amplifier IC. See album "".


The existing four-pin configuration that I mentioned earlier in this string is actually a thru-hole bottom arrangement. I will need to adapt from the Minicircuit's surface mount arrangement to the thru-hole arrangement. I can?build a prototype board to do this.


The original attachment was solderless, using the plug-in holes on the circuit board in conjunction with mechanical flanges, screws, and nuts?to hold the IC tight to the board. I will likely need to solder the four pins with the new configuration.


I am relatively new at SMT, so any comments or suggestions would be very helpful.


Thanks,


Joe / KN5U
Re: 8594e front panel buttons not responding

 

From memory, doesn't this thing have a 'Hold' function key that locks out the keys, keypad and encoder knob? It hasn't got stuck in that mode somehow has it?
Re: 8594e front panel buttons not responding

 

¿ªÔÆÌåÓý

It should power up in local if the board is OK.? You might also try just removing the GPIB card for a test.? It senses what if any interface card is present on power up.? I think it is most likely that the keyboard is disconnected (or defective).

?

Daun

?

Daun E. Yeagley, II, N8ASB

?

From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Tuesday, February 23, 2016 10:09 AM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 8594e front panel buttons not responding

?

?

It does have GPIB.? Could that happen spontaneously?? Would that persist through a power cycle?

I haven't been controlling this with GPIB.? I have a GPIB interface, so I suppose I could try to query it remotely and put it back to local control if that's the case.
Re: 8594e front panel buttons not responding

 

It does have GPIB.? Could that happen spontaneously?? Would that persist through a power cycle?

I haven't been controlling this with GPIB.? I have a GPIB interface, so I suppose I could try to query it remotely and put it back to local control if that's the case.
Re: 8594e front panel buttons not responding

 

Does the instrument have GPIB option?? Front panel could be locked out by remote...
-rastro


On Monday, February 22, 2016 11:17 PM, "dfnr2@... [hp_agilent_equipment]" wrote:


?
I just powered up my 8594e to find that it's not responding to any front panel buttons, soft buttons, or the jog dial.? The intensity knob works.? The unit passes the self tests and starts sweeping just fine.

The last time I powered it up, about a year ago, I had just replaced the battery and checked to make sure the calibration constants and DLPs were all still there.? The buttons worked fine then.

I thought perhaps I didn't replace all the cables as securely as possible, so I pulled off the cover and checked the cabling to make sure nothing obvious is loose.? No luck.?? I guess the next thing is to pull off the front panel assembly and work my way backward to the CPU board.? Has anyone here seen this happen before??? Any suggestions?

Thanks,

Dave
Re: How do you clean buttons on HP uWave gear?

 

See my earlier post on this thread, but on all the instruments I listed, it was trivial - basically drop the front panel out (see your manual - but generally a few screws through the top and bottom of the front frame), remove the PCB from it and away you go.
Re: How do you clean buttons on HP uWave gear?

 

The recent thread about switch cleaning morphed into a learned in-depth discussion of Isoprop alcohol (IPA) and its kin. If you search for the thread back in December entitled 'HP 8568B - Very Sick help please' you'll find it

As a first-time HP Switch cleaning operative on an 8566A my input was:-
**
Having removed the PCB I flood sprayed the switches with IPA and operated each a few times, within just three or four operations they freed up like magic going from clunky 'feels-like-something-is-about-to-bust' to almost silky smooth! Then blew it off with an air-gun and gave it another dose for luck.

Turned my attention to the weak and feeble key, it was the 'MHz' one so dead easy to get to (not the way Mr Murphy's law usually works?) and found the problem was the steel spring was not missing but busted, about 3mm shorter than one pulled from the spare pcb.

Fitting was simple and as people here have said, no need to pull the key-cap. Just slide the spring back in through the key body with one hand and use a very fine point - I used SMT fine tweezers - to guide the end 'up' the key stem as it reaches it. It is important to ensure the spring is central and both ends sit correctly in the tiny recesses made for them, one in the stem the other is a lip in the body molding - a glance at good key makes it clear.
****
I would add that it was so effective and transformed the switch action to as-new I have now worked my way through all switches on, HP3455, 3456, 8112 and 438 and the clunky old action has gone and they are a joy to use! (I know - I should get out more...)
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