That's PIC17C42A 33MHz PLCC in Industrial or Extended Temperature range

Must be unused as they are OTP parts.

Thanks
David

Hello everyone.

My ESG 3000A became faulty (unlevel indicated) some 20 (!) years ago but I finally now have time to repair it. Relatively fixed frequency output noise (broadband peaks at circa 200 MHz and 700 MHz) was associated with one of the 1GG3 4205 (SOP-8 packaged) amplifers in the output module. Removing the amplifer fixed that problem but, and with no surprise with an amplifier removed, the output level remains out of specification.

Does anyone have access to, or can point me in the direction of, a datasheet for 1GG3 4205? Ideally, I'd have data for all the 1GG-series devices (1GG3-4206 output amp and 1GG7-4225 modulator). I've seached but can find no information.


Thanks.

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I am gathering the test equipment needed and looking for information to make up the Special Test Cables. I should be able to make them and test the characteristics but don't know how long they are. I suspect the lengths are chosen to allow the two signals measured to line up on the scope screen if the pulse delay between the two signals is set correctly.?

Regards
Tony

The repair would be very hard and questionable reliability as the potting must be vacuum to avoid air voids.

Try Walter at Sphere Research in BC CA, he may have a clew.

Finally look for a junker unit at a ham flea, I think many similar HP SA used the same HV module in the display.

Bon Chance,

Jon

Bonjour, I have these types of HP bridges since 1980s. The manuals are readily available and have troubleshooting flow charts.

I have not looked into my 4262A in 20 years ...my memory.

I think it has many PCB on edge connectors. Oxidation on the card edges can cause intermittents.

Remove, and clean all PCB card edges and main board connectors, iso alc or Deoxit. This often fixes it!

The relays can be easily checked and cleaned (except reed relays, which seldom fail).

Bon chance,

Jon

Hello avvidclif,
option 704 adds 4kx16-bit of vector memory (whew! :-) ), everything else is standard.
Chris

I have a HP-1345A display unit that is bad. It is in a pristine HP-3577A. I purchased a working display. My dead unit has Option 704 and the working unit doesn't. Would I be able to put the 704 in the working display w/o any problems? I can't seem to find installation instructions.

I just repaired a HP 4271B
The problems were mostly in the relays. The relays switch function from L to C and also control the ranges 1,2,3 ....etc
I think the 4262 also uses relays for some these purposes, I think it does for Ranges.
See what Ranges work, I think there are four relays that in different combinations are engaged in different ranges.
Also, you might be missing a test freq,
SelfTest can apparently be done with different settings. Maybe help to isolate the problem.
There are several Ranges on your LCR, you have either 7 or 8 ranges. 5 of these ranges are used with C.
There are 3 test freq, 120 Hz, I KHz and 10 KHZ, should be easy to find on the H Cur BNC Terminal. P37 Service, maybe you are missing one.
I am guessing that the 120 Hz is only used in the highest C range on Auto, try other Freq with your .95 cap.
After that,
I would start with page 195/264 of the service manual.


Wally KC9INK

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hi Phil?

you might look in the file?Above 10000 to 89999 as there are bits of information relating to the 89441

Regards Paul

Hi, all,
Well, hallowe'en may have been yesterday, but this AM my trusty 98441A
(S/N 3416A01840, options 1C2, AY7, AY9, AYA, AYH, and UFG
seems to have passed beyond the veil:

The RF unit is not connected.

It passes POR fine,

but then falls over as the main app is starting.

Suggestions?

Thanks

Phil Hobbs
ElectroOptical Innovations LLC
Briarcliff Manor NY

Hi all

just returning to doing a bit of electronics as I have been out of it long before covid due to health reasoned but hopefully 90 % sorted now?
as Part of a hands on Lab area for giving hands on testing experience to those new out of collage and university i want to set up a bench for Optical work?
already set up RF & optical TDR but now want to look at path loss? so have acquired? a few bits most not Hp but
just won a HP 8156? with a fault 0040 can any one help with service manual as the operators manual does not have the fault 0040 listed also any information on the plug in
also looking for a optical transmitter hopefully 1.31 or 1.55 um such as a HP 83430
Pictures of work dun earlier this year on the hands on Lab area can be Sean in the pictures on this site labelled ghs
noting the area did not exist in February 2021 and took 25 days to complete including populating 10 off 19 inch? racks out of shot at Zero cost / budget?

Regards Paul?

Hi,
Does anyone have a spare A6A1 HV assembly for a HP8563A spectrum analyser available that they don't need? I've read this topic

/g/HP-Agilent-Keysight-equipment/topic/hp8563_hv_supply_repair/30316093

and it appears that these can not be repaired easily. Or does someone know of someone who CAN repair these units? Thanks.

David.

Hello,
I am currently working on a 54121A Test Set for my 54120A Sampling Scope. The problem: R108 in channel 4 on the Vertical PCA is burnt out completely, leaving a charred PCB and heavily burnt adjacent resistors. From what I could figure out is that it likely is a voltage drop/decoupling resistor. Thanks to three other channels having R107, R106 and R105 in the same circuitry location, I could figure out the value of this resistor (6R8). I swapped it for a new one, put an amp meter in between and powered up the unit with a FLIR camera in place to check if it would heat up again. But no problems detected, the unit works. Lacking a component-level SM, the function of R108... is not entirely clear, thus I cannot find out the reason why it burned in the first place. Could be a temporarily conductive tantal cap downstream (lots of these three-legged beasts are used in this unit for filtering +/-15V), but who knows. Before I start to re-engineer the schematic: is anybody out there in possession of a CLIP or at least a schematic of this unit? I bought the full set of manuals from Dave already, but it actually does not contain a CLIP for the Test Set.
Funny enough: the unit from another forum member I am in contact with shows exactly the same burnt R108 resistor. Coincidence? Did anybody else have the same problem in the past?
Thanks
Chris

On Sun, Oct 31, 2021 at 10:10 PM, Fuqua, Bill L wrote:

HP200CD

Hi Folks,

I have done my best not to stretch out this thread, but have decided to do a very brief “HP 200CD - biography”.

From 1966 to 1970, I was part of a USAF contingent assigned to NATO. ?I was on a mobile Maintenance Team with Allied Forces Central Europe, based out of Maastricht, NL. ?We used the 200CD to check voice channels on Lenkhurt Frequency Division Multiplex.
All 6 of our MW sites (Belgium, Germany and The Netherlands) had 1 or more 200CDs in regular use. (We used Sierra Frequency Selective Voltmeters to check the Baseband level of channels at each end of a MW link.)

I regularly carried a set of HP TE across International borders - sometimes 3-4 crossings in a single day.

Larry
AC9OX

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