----- Original Message -----

From: DON CRAMER

To: HP Agilent Group

Sent: Monday, November 01, 2004 2:06 AM

Subject: [hp_agilent_equipment] E4411A spectrum analyzer low gain fixed

I thought I should document repair to an E4411A (alias ESA-L1500A) 1.5Ghz spectrum analyzer in the event anyone here might find the information useful.

 

The symptom was low gain (~28dB low) but with flat response and all other functions ok.  The HP service manual only goes down to the module level, which is doubly unfortunate for this instrument because the one RF assembly module contains everything from the front panel input connector all the way back to the 2nd IF input.  The manual helped confirm the fault was in the RF assembly module, but at that point they say don't service it, get a replacement instead.  That would be ok except the replacement price is $6120 exchange.  For an analyzer that probably went for $8K new, I bet they don't get too many takers.  As the SA was initially free, I didn't have too much to lose by violating the recommendation and taking a peek inside the RF assembly.

 

The clever RF assembly comprises one PCB, with castings that sandwich the board in between providing circuit isolation.  The service manual does give some information as to what's in there via a coarse block diagram and a page or two of explanation.  I was able to find a shorted transistor (Q6) in what I believe is the 2nd mixer (could be the tail end of the 1st IF).  This was located using the diode function of a DMM; I did not have to power up the assembly.  Normal was about a 0.45V diode drop from "dot" (I thought base, but turned out to be gate) to the other leads.

 

The transistor is a "pill package" 4 lead part with "211" as the sole ID marking.  Some hunches lead to the identity of the part being most likely an HP (Agilent) ATF-21186 GaAs FET, which is used in numerous locations in the front end of the RF assy.  Regarding the 0.45V drop, what I was measuring I believe is a schottky barrier gate structure.  I don't work in RF; FETs in my line are all insulated gate (enhancement mode) devices, so this has been an interesting experience.

 

The bad news was the ATF-21186 was discontinued in 2001.  Newer parts don't use the pill package.  However, I did find a small lot of '21186 parts (9805 lot code) via a helpful broker at about $14 each, with a required lot buy of 16 pieces.  My analyzer is SN prefix "US37.." so the parts are less than a year apart in manufacture date.  Upon arrival I was pleased to find the new parts looked identical to the old.  BTW, a "-STR" suffix on the ATF-21186 designates the part packaged in a strip of 10. 

 

I did not attempt to "match" devices or anything--I just replaced the bad part with one of the new ones.  Input welcome if someone knows better.

 

One tool I found helpful in putting the RF assy castings back together with the zillion M3 screws used is a good torque screwdriver to get everything down evenly.  The tightening torque is 9 in-lbs on everything (casting screws, casting to instrument screws, and instrument case screws).  As there is no give to the housings, it is crucial all screws get tightened down the same amount.  Over tightening one screw will make the adjacent one loose for instance.  It takes two of three passes around them all to get to final torque.  I used a Proto 6106 (now apparently owned by Stanley) driver which supposedly will not over torque screws even with multiple attempts to retighten them.

 

The replacement transistor seems to have solved the problem.

 

One other hint.  The one piece rubber membrane key pad has thin walls where the raised key caps drop down to the sheet.  They are easily torn if you do something silly like drive the key cap sideways through overzealous cleaning for instance.  I found a reasonable fix was to build a "hinge" between the torn key cap and base sheet using a flowable silcone product made for car windshield gasket sealing: Permatex Windshield and Glass Sealer.  I found a 1.5oz tube of the stuff available at the local hardware store.

 

Don C

Beaverton, OR

 

 

 

 

Dear All,
I have a HP 8690B, the mainframe is in a very bad condition but the plug-in
unit works well.
I think about making my own power supply and ramp generator to drive the
plug-in module.
I found a military calibration manual but no schematic or indication about
the voltages/signal which are send to the plug-in module.

Does anyone has information, schematic ??

Regards
David / F1URI

Which plugin do you have?   The BWO ones used a large regulated high
voltage supply but the solid state ones only used the smaller low
voltage supply.  Probably not worth the effort if it's a BWO plugin
but if solid state may well be.

73
  Dave,  ZL3FJ



----- Original Message -----
From: "Lecroy" <lecroy2607@...>
To: <test-equipment@...>;
<hp_agilent_equipment@yahoogroups.com>
Sent: Tuesday, November 02, 2004 7:04 AM
Subject: [hp_agilent_equipment] HP 8690 sweep generator


>
> Dear All,
> I have a HP 8690B, the mainframe is in a very bad condition but the
> plug-in
> unit works well.
> I think about making my own power supply and ramp generator to drive
> the
> plug-in module.
> I found a military calibration manual but no schematic or indication
> about
> the voltages/signal which are send to the plug-in module.
>
> Does anyone has information, schematic ??
>
> Regards
> David / F1URI
>
>
>
> ------------------------ Yahoo! Groups
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

At 11:13 AM 11/1/2004, Harlan Gustafson wrote:
>Does anyone know where I could find schematics for my HP 54510A digital
>oscilloscope?  I've looked in a few places without luck.
>Thanks,
>Gus

Harlan

It is unlikely you will ever find schematics ( not impossible...but unlikley)

Hp ( and (Tektronix too for that matter) stopped issuing schematic level
service info for most of their scopes from the early 1990's on. The boards
in these units contain a large number of large pin out custom IC's which
even if you could trouble shoot and find a replacement for today it takes
special soldering equipment to remove them. HP and Tek both took the
position that you had to buy a new repayment cad and that the boards
themselves were not field repairable.

My conspiracy theory version of this is that the schematics exist and are
being held in the basement in vault at some obscure HP location guarded by
evil lawyers and mutant accountants.





Dave
NR1DX
nr1dx@...

"A man who picks a cat up by the tail learns a lesson he can learn no other
way" .... Mark Twain

NR1DX wrote:
> HP and Tek both took the position that you had to buy a
> new repayment cad ...

What's that?

Fred
--
<><
--
Outgoing checked by eTrust EZ AV

--- In hp_agilent_equipment@yahoogroups.com, "Harlan Gustafson"
<accellodyne@n...> wrote:
> Does anyone know where I could find schematics for my HP 54510A
digital oscilloscope?  I've looked in a few places without luck.
> Thanks,
> Gus

could you be more specific about what it is you're looking for? are
you looking for board level diagrams or actual circuit schematics.
most of the older service/troubleshooting manuals at least had board
level troubleshooting diagrams. if you could give me some more info i
might be able to help you.

Fred

What that is a really bad typo

Shuda been

"replacement card"

Dave

At 10:14 PM 11/1/2004, Fred Olsen wrote:

>NR1DX wrote:
> > HP and Tek both took the position that you had to buy a
> > new repayment cad ...
>
>What's that?
>
>Fred
>--
><><
>--
>Outgoing checked by eTrust EZ AV
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>

Dave
NR1DX
nr1dx@...

"A man who picks a cat up by the tail learns a lesson he can learn no other
way" .... Mark Twain

>>>new repayment cad ...

NR1DX wrote:
> What that is a really bad typo
> "replacement card"

That's OK, I understand.  The hour was getting late, the bottle was
getting low ...  ;<))

Fred
--
<><
--
Outgoing checked by eTrust EZ AV

Fred Olsen wrote:

>NR1DX wrote:
>
>
>>HP and Tek both took the position that you had to buy a
>>new repayment cad ...
>>
>>
>
>What's that?
>
>Fred
>
>
That's where you have to take out a home loan to pay for the replacement
card  :)

John
<http://jlkolb.cts.com>

----- Original Message -----

From: factory_peasant

To: hp_agilent_equipment@yahoogroups.com

Sent: Monday, November 01, 2004 11:38 PM

Subject: [hp_agilent_equipment] Re: Schematics for HP 54510A scope

--- In hp_agilent_equipment@yahoogroups.com, "Harlan Gustafson"
<accellodyne@n...> wrote:
> Does anyone know where I could find schematics for my HP 54510A
digital oscilloscope?  I've looked in a few places without luck.
> Thanks,
> Gus

could you be more specific about what it is you're looking for? are
you looking for board level diagrams or actual circuit schematics.
most of the older service/troubleshooting manuals at least had board
level troubleshooting diagrams. if you could give me some more info i
might be able to help you.

Hi all,
I have a Tek 2432 which fails the following;
1: 7000 CCD
2: 8000 PA
3: 9000 TRIGS

I also have a Tek 2432A which fails;
1: 5000 WP
2: 8000 PA    -- no pass/fail message
3: 9000 TRIGS -- no pass/fail message

Is this an almighty going round in circles job or has anyone been
through this before? Before you suggest it - the batteries are ok.
I may donate these if they require a lot of time to fix to somebody
who has the time.

Regards

Gearoid Loughnane
Dublin

It takes to much time to fix it and/or too much money. I am willing to take
them from you.
Regards
frank

-----Original Message-----
From: gearoidloughnane [mailto:echelon@...]
Sent: Wednesday, November 03, 2004 10:43 AM
To: hp_agilent_equipment@yahoogroups.com
Subject: [hp_agilent_equipment] 2430A & 2433 Power up Failures



Hi all,
I have a Tek 2432 which fails the following;
1: 7000 CCD
2: 8000 PA
3: 9000 TRIGS

I also have a Tek 2432A which fails;
1: 5000 WP
2: 8000 PA    -- no pass/fail message
3: 9000 TRIGS -- no pass/fail message

Is this an almighty going round in circles job or has anyone been
through this before? Before you suggest it - the batteries are ok.
I may donate these if they require a lot of time to fix to somebody
who has the time.

Regards

Gearoid Loughnane
Dublin








Yahoo! Groups Links

You might have better luck on a tektronix group.

-Chuck

gearoidloughnane wrote:
>
> Hi all,
> I have a Tek 2432 which fails the following;
> 1: 7000 CCD
> 2: 8000 PA
> 3: 9000 TRIGS
>
> I also have a Tek 2432A which fails;
> 1: 5000 WP
> 2: 8000 PA    -- no pass/fail message
> 3: 9000 TRIGS -- no pass/fail message
>
> Is this an almighty going round in circles job or has anyone been
> through this before? Before you suggest it - the batteries are ok.
> I may donate these if they require a lot of time to fix to somebody
> who has the time.
>
> Regards
>
> Gearoid Loughnane
> Dublin
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

Gearoid,

I believe if the 7000 CCD error comes up the CCD is faulty and the scope is
a right off as the CCD 's are unobtainable. There are lots of these scopes
laying around  because there are no replacement parts.

David

At 01:42 AM 4/11/2004, you wrote:


>Hi all,
>I have a Tek 2432 which fails the following;
>1: 7000 CCD
>2: 8000 PA
>3: 9000 TRIGS
>
>I also have a Tek 2432A which fails;
>1: 5000 WP
>2: 8000 PA    -- no pass/fail message
>3: 9000 TRIGS -- no pass/fail message
>
>Is this an almighty going round in circles job or has anyone been
>through this before? Before you suggest it - the batteries are ok.
>I may donate these if they require a lot of time to fix to somebody
>who has the time.
>
>Regards
>
>Gearoid Loughnane
>Dublin
>
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>

David Hopkins (VK4ZF)
Queensland
AUSTRALIA
davhop@...
S 27, 22.294  E153, 11.008

Hi,

I recently picked up a used 141t with a 8552 if and a 8553 rf front
end.  the anlayzer works, but the center frequency is about 24 mhz
off.  Does any one know a procedure recal the center frequency?  I
have tried to adjust the "tuning range" adjustment, that had no
effect.

Thanks

john

That's pretty far off for an 8553.  How are the power supply voltages?

www.manualsplus.com will most likely have the book.

-- john KE5FX


>
> Hi,
>
> I recently picked up a used 141t with a 8552 if and a 8553 rf front
> end.  the anlayzer works, but the center frequency is about 24 mhz
> off.  Does any one know a procedure recal the center frequency?  I
> have tried to adjust the "tuning range" adjustment, that had no
> effect.
>
> Thanks
>
> john
>
>
>

John,

Thanks for the note.  I will check them out, I did not even think to
check the supply voltages.  I have an electronic version of an US
military manual and go look.

Thanks

John--- In hp_agilent_equipment@yahoogroups.com, "John Miles"
<jmiles@p...> wrote:
> That's pretty far off for an 8553.  How are the power supply
voltages?
>
> www.manualsplus.com will most likely have the book.
>
> -- john KE5FX
>
>
> >
> > Hi,
> >
> > I recently picked up a used 141t with a 8552 if and a 8553 rf
front
> > end.  the anlayzer works, but the center frequency is about 24
mhz
> > off.  Does any one know a procedure recal the center frequency?
I
> > have tried to adjust the "tuning range" adjustment, that had no
> > effect.
> >
> > Thanks
> >
> > john
> >
> >
> >

I am looking for information for programming NTIA and FCC Spectral masks
into the HP89440A Vector Signal Analyzer.
Any help with this would be appreciated. Any information on a .sdf files
would be good also. I have a file for one mask, if I can rename and edit
that mask for a new mask that would be nice.

_________________________________________________________________
Get ready for school! Find articles, homework help and more in the Back to
School Guide! http://special.msn.com/network/04backtoschool.armx

I am looking for manual for hp counter 5321B. Any help would be appritiated.

Regards

Miroslav Pokorni

Greetings, I am looking for a HP 3406A manual, that hopefully is
cheaper than the actual unit was. PDF is plenty fine.
Thanks
Dave Robbins

The manual on LOGSA includes the A8 board schematic (see page 8-53):

https://www.logsa.army.mil/etms/data/A/059359.pdf

Hi Dave,
I think I have a PDF of the HP3406a I will confirn later when I get home

regards

Gary Beech VK2KYP

	 -----Original Message-----
	 From: daveolla [mailto:grobbins@...]
	 Sent: Tue 9/11/2004 10:17 PM
	 To: hp_agilent_equipment@yahoogroups.com
	 Cc:
	 Subject: [hp_agilent_equipment] HP 3406A manual needed



	 Greetings, I am looking for a HP 3406A manual, that hopefully is
	 cheaper than the actual unit was. PDF is plenty fine.
	 Thanks
	 Dave Robbins





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Hello,

If you do have that PDF, I would also really appreciate a copy!

Great group!!

Thanks in advance,

Mitch

--- In hp_agilent_equipment@yahoogroups.com, "Gary Beech"
<gbeech@m...> wrote:
> Hi Dave,
> I think I have a PDF of the HP3406a I will confirn later when I
get home
>
> regards
>
> Gary Beech VK2KYP
>
>  -----Original Message-----
>  From: daveolla [mailto:grobbins@n...]
>  Sent: Tue 9/11/2004 10:17 PM
>  To: hp_agilent_equipment@yahoogroups.com
>  Cc:
>  Subject: [hp_agilent_equipment] HP 3406A manual needed
>
>
>
>  Greetings, I am looking for a HP 3406A manual, that
hopefully is
>  cheaper than the actual unit was. PDF is plenty fine.
>  Thanks
>  Dave Robbins
>
>
>
>
>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
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Greetings to all.I have a manual for the 8600A (LED display version) Digital
Marker but it lacks the schematics and PCB layouts.Can anyone help with a
scan or photocopy? All costs gratefully prepaid.
Brian Goldsmith.

Hi all,
Im looking for the following:

Make:           Agilent
Model:          6814B
Description:    AC Power Source/Analyzer
Part Required:  Board A8 DSP

Will make a good offer if anyone has one available.
Thanks

Gearoid Loughnane

Hello Gary,

I am not sure if my Yahoo address can accept a file this large. I am
quite sure that it can

As an alternative, can you post it to the Files section on this
group?

If these options don't work, I have another address which I can send
to you off line that can accept the file.

Appreciate the effort!!

Cheers,

Mitch

--- In hp_agilent_equipment@yahoogroups.com, "Gary Beech"
<gbeech@m...> wrote:
> Hi all I have a PDF of the HP3406a, it is 4MB can you accept a
file this
> large
>
> regards Gary Beech VK2KYP
>
>   _____
>
> From: aquaman8_2001 [mailto:aquaman8_2001@y...]
> Sent: Thursday, 11 November 2004 1:04 AM
> To: hp_agilent_equipment@yahoogroups.com
> Subject: [hp_agilent_equipment] Re: HP 3406A manual needed
>
>
>
> Hello,
>
> If you do have that PDF, I would also really appreciate a copy!
>
> Great group!!
>
> Thanks in advance,
>
> Mitch
>
> --- In hp_agilent_equipment@yahoogroups.com, "Gary Beech"
> <gbeech@m...> wrote:
> > Hi Dave,
> > I think I have a PDF of the HP3406a I will confirn later when I
> get home
> >
> > regards
> >
> > Gary Beech VK2KYP
> >
> >       -----Original Message-----
> >       From: daveolla [mailto:grobbins@n...]
> >       Sent: Tue 9/11/2004 10:17 PM
> >       To: hp_agilent_equipment@yahoogroups.com
> >       Cc:
> >       Subject: [hp_agilent_equipment] HP 3406A manual needed
> >
> >
> >
> >       Greetings, I am looking for a HP 3406A manual, that
> hopefully is
> >       cheaper than the actual unit was. PDF is plenty fine.
> >       Thanks
> >       Dave Robbins
> >
> >
> >
> >
> >
> > Yahoo! Groups Sponsor
> > ADVERTISEMENT
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Hi all I have a PDF of the HP3406a, it is 4MB can you accept a file this large
 
regards Gary Beech VK2KYP

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the hp_agilent_equipment
group.

   File        : /3406a.pdf
   Uploaded by : vk2kyp <gbeech@...>
   Description :  HP3406a Wideband Voltmeter

You can access this file at the URL:
http://groups.yahoo.com/group/hp_agilent_equipment/files/3406a.pdf

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/help/us/groups/files

Regards,

vk2kyp <gbeech@...>