Thread: Source for 1GC1-4210 Chip for E4436B FRAC-N Board


Permlink Replies: 15 - Pages: 2 [ 1 2 | Next ] - Last Post: Jun 12, 2013 9:04 AM Last Post By: AndyC
swperk


Posts: 86
Registered: 01/11/08
Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Aug 21, 2011 9:59 PM
Click to report abuse...   Click to reply to this thread Reply
After determining that the loss of phase lock of my E4436B is due to a defective 1GC1-4210 SSOP chip on the FRAC-N board, I am now looking for a replacement chip. Does Agilent still stock this chip? If so, is it possible for me to purchase just the chip from Agilent, or do I have to send my board into Agilent to have them replace the chip?

If Agilent no longer stocks this chip, does anyone know of a reliable source for them? I have been in contact with a number of chip suppliers (all of whom seem to be in China), but am concerned about the likelihood of getting a usable, in-spec chip, given that I have no familiarity with any of these companies and therefore have no basis upon which to pick any one supplier over any other.

Regards,
Stan
tabbott


Posts: 1,427
Registered: 07/24/09
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Aug 24, 2011 9:54 AM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
Hi Stan,

Agilent does have this part - I will contact you with details.

Thanks for participating in the Agilent Forums -
swperk


Posts: 86
Registered: 01/11/08
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Aug 24, 2011 10:23 AM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
I got your PM, but your account has PM receipt blocked, so I can't reply. What way works best for you to get my reply?

Regards,
Stan
martine1212

Posts: 26
Registered: 05/30/07
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Oct 27, 2011 8:35 PM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
We also have a fractional N board with a failed 1GC1-4210
Is is still possible to get the part?
The board is no longer available and the instrument is out of support. E4423B
What do we have to do to buy 1pc or 2 of the divider?
Or if it is no longer available, is there any pinout diagram because there are a few frequency dividers that could potentially work....
But there is no information about whether the part is programmed serially or parallel.

Thank you.
tabbott


Posts: 1,427
Registered: 07/24/09
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Nov 7, 2011 3:56 PM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
Hi martine1212 -
I was able to find and ship to you the last of these support parts. I am sorry to say that I have no more to share.
Enjoy your part - and thank you for utilizing the Agilent Discussion Forum.


Hi Stan -
You and martine1212 got my last two support parts, sorry I have no more to offer.
Per your feedback on this Forum string - I have opened my private messaging.
Thanks for the feedback - and thanks for participating in this Forum!

Regards -
ann

Posts: 1
Registered: 04/15/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Apr 15, 2013 1:40 AM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
dear ,
i think i can help you . Would you like to add my skype to talk more . My skype is ann199110 . Send me E-mail is also ok , ann@czehk.com . Hope to hear from you soon .
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: May 28, 2013 12:45 AM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
Sadly it appears that my E4437B has suffered from failure of the divider chip on the Frac-N board.
The error in this case is a YIG unlock , and the output appears to be band limited noise ( which looks sensible after reviewing the block diagrams ).

Note: the part fitted is an Agilent part - but the board is an E4423-60019 not E4423-69019

So - is there anywhere to get hold of one of these devices ( 1GC1-4210 )

None of the bands in the range result in a lock - so I suspect total failure of the 1GC1-4210 , or at least the firs stage divide by 2.

I shall attempt to confirm all is well with the 500-1000Mhz output from the Frac-N board , if that's the case I think I can be certain ?

Any advice gladly taken.
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: May 31, 2013 7:30 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
Okay so I checked the 500-1000Mhz into the sample board - that looks good.
Also checked the 1Ghz into the sample - again looks okay.

So - I guess the next thing is to check the YIG driver output , unfortunately I have nothing capable of the 4-8Ghz range.

What sort of signal should I expect from the YIG driver ? Spectrally pure ?

I guess I could feed 1Ghz from my other sig gen into the frac-n divider chain and see what I get at the output.
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 1, 2013 3:53 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
Okay - well it might not be the divider after all (phew).
I have access to a spectrum analyser which goes upto 4.3Ghz , and didn't see any output from the YIG.
To try and confirm this I injected 1Ghz +6dbM into the frac-n divider.
The RF output now looks a lot better , frequency peaks rather than wide spectrum noise.
( noise floor drops right down rather than being around -50dbM )

So looks more and more like a YIG/Driver problem.

Is it possible that a YTO pretune adjustment might help ? Or is it looking like an actual fault in either the YIG or the driver ?

Again - advice from this totally dead forum appreciated.
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 1, 2013 4:55 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
The M+ terminal of the YTO/YIG seems stuck at -15V.

So sound like a pretune problem ? Current source /DAC / Calibration?
Does this YTO have a permanent magnet ? Or is the resonance purely dependant on the current through the main and fm coils ? ( sorry this is my first time with YIG related items )

So - I've downloaded the calibration software - and ordered a GPIB interface.
jvandewalker

Posts: 6
Registered: 02/06/12
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 1, 2013 7:46 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
Hi
The software you need is called the Falcon Software. Do not use N7800A software for alignment. I believe N7800A only offers power level alignments.
The Falcon software is used for testing and aligning the old ESG series signal generators. Alot of times I have seen people try to align these units with a defective frac n
chip , the Unit afterwards gives a host of strange errors even after replacing the 1GC1-4210. The people aligning( it all with good intent ) did not realize the problems
this was cause. So replace your 1GC1-4210 , check a full sweep of the unit for wierd Noise, If this passed and looks good , And You Know the Frac N was the culprit
to begin with , then do the alignments via the Falcon Software. Good Luck and be patient with this software. I believe you can ask Agilent or get the old ESG support CD
that contains these alignments. Also sometimes you have to replace the 1GC1-4210 a couple of times , going on the market for these are a gamble, and also use a
hot air gun to flow the back plain on the chip ( very important).

John
jvandewalker

Posts: 6
Registered: 02/06/12
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 1, 2013 7:46 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
Hi
The software you need is called the Falcon Software. Do not use N7800A software for alignment. I believe N7800A only offers power level alignments.
The Falcon software is used for testing and aligning the old ESG series signal generators. Alot of times I have seen people try to align these units with a defective frac n
chip , the Unit afterwards gives a host of strange errors even after replacing the 1GC1-4210. The people aligning( it all with good intent ) did not realize the problems
this was cause. So replace your 1GC1-4210 , check a full sweep of the unit for wierd Noise, If this passed and looks good , And You Know the Frac N was the culprit
to begin with , then do the alignments via the Falcon Software. Good Luck and be patient with this software. I believe you can ask Agilent or get the old ESG support CD
that contains these alignments. Also sometimes you have to replace the 1GC1-4210 a couple of times , going on the market for these are a gamble, and also use a
hot air gun to flow the back plain on the chip ( very important).

John
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 8, 2013 1:29 PM   in response to: swperk in response to: swperk
Click to report abuse...   Click to reply to this thread Reply
Well - I did some further tests via the Falcon software - and it does seem to confirm that the pre-tune DAC has a problem. Setting the pretune DAC has no effect on the yto pretune abus reading ( always sits around -0.018 volts. ( even a DAC setting of 4095 is the same )

So either a dac failure or one of the op-amps prior to the abus monitoring point.

Oh how I wish I had a schematic for the yto driver board.
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 10, 2013 11:54 AM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
A little more progress.

The dac seems okay - and the opamp after it seems okay ( because the output of the op27 varies nicely from -4v to -2v when tuning from 4ghz to 2ghz , then back to -4v at just under 2ghz )

After this the signal enters an AD797 opamp - but the output of this opamp seems stuck at -13.7v.
The output of this opamp appears to drive the gate of a motorola 23p06 fet which controls the current flowing in the yto.

So the fault is either the AD797 or passives around it.
Presumably the ad797 and 23p06 form a voltage to current convertor.

ANYONE have a schematic of this section?
AndyC

Posts: 11
Registered: 05/28/13
Re: Source for 1GC1-4210 Chip for E4436B FRAC-N Board
Posted: Jun 10, 2013 1:54 PM   in response to: AndyC in response to: AndyC
Click to report abuse...   Click to reply to this thread Reply
Okay - somewhat better news - I sketched the schematic for the current driver - and I had come to the conclusion that it had to be the driver fet.

So - I was just looking at desoldering it when I noticed that it wasn't securely soldered :-) , resoldering the fet and now I have signal output !.

The yto is still not locked - but we're progressing. ( the falcon software yto driver tests all pass ).

Point your RSS reader here for a feed of the latest messages in all forums