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- HP-Agilent-Keysight-Equipment
- Messages
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2430A & 2433 Power up Failures
gearoidloughnane
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 |
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Re: Schematics for HP 54510A scope
Harlan Gustafson
¿ªÔÆÌåÓýI'm giving this second hand so I'll
find out more and get back.? There is supposed to be a 15v supply to the
crt circuitry which is down.? Which schematics do we need?
Thanks,
Gus
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Re: Schematics for HP 54510A scope
NR1DX
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:DaveHP and Tek both took the position that you had to buy aWhat's that? NR1DX nr1dx@... "A man who picks a cat up by the tail learns a lesson he can learn no other way" .... Mark Twain |
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Re: Schematics for HP 54510A scope
--- In hp_agilent_equipment@..., "Harlan Gustafson"
<accellodyne@n...> wrote: Does anyone know where I could find schematics for my HP 54510Adigital oscilloscope? I've looked in a few places without luck. Thanks,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. |
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Re: Schematics for HP 54510A scope
NR1DX
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.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 |
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Re: HP 8690 sweep generator
Dave Brown
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.
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73 Dave, ZL3FJ ----- Original Message -----
From: "Lecroy" <lecroy2607@...> To: <test-equipment@...>; <hp_agilent_equipment@...> Sent: Tuesday, November 02, 2004 7:04 AM Subject: [hp_agilent_equipment] HP 8690 sweep generator
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HP 8690 sweep generator
Lecroy
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 |
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Schematics for 54510A
Harlan Gustafson
¿ªÔÆÌåÓýDoes anyone know where I could find
schematics for my HP?54510A digital oscilloscope?? I've looked in a
few places without luck.
Thanks,
Gus
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E4411A spectrum analyzer low gain fixed
DON CRAMER
¿ªÔÆÌåÓýI 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.
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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.
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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.
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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.
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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.?
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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.
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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.
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The replacement transistor seems to have solved the problem.
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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.
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Don C
Beaverton, OR
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Re: Can't ID Equipment
gerbo04
I have looked at pictures of the 5345A and the dimensions all match
up. Thanks for the ID JM. I got so many google hits on 05345-XXXXX that I was led to believe that was a generic prefix for HP boards. It appears that it does not have the HPIB option, there is one slot open and there are two aluminum blank cover plates on the back where perhaps the connector would likely be. A couple of the boards have many custom gold cover HP ICs, all socketed. Anyone wants parts let me know. (Never heard it called a 'hot rock box', I like that.) It also has: 05345-60031 88802F PLL Buffer Multiplier 05345-60045 88802F 05345-60007 PS 05345-60006 PS (I need a knob or two for a 1720A-family scope and an 8620C generator if anyone wants to swap stuff.) Thanks again, Gerry W. --- In hp_agilent_equipment@..., Scott Newell <newell@c...> wrote: At 04:30 AM 10/30/2004 +0000, gerbo04 wrote:as the A12follows:As JM explained, it's certainly a 5345A. (HPIB) board (which you may not have--it's not on the list youposted), a couple of EECL chips to fix my 5370, and maybe the hot rock box. |
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Re: 3406A sampling meter/peeling faces
¿ªÔÆÌåÓýYou
could use a paint on mask that you can get at hobby shop to protect the
mirror.
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Re: 3406A sampling meter/peeling faces
Greetings, recieved a 3406A sampling meter free, now I need toThe advantage of the sampler is that it has good linearity over a wide dynamic range, unlike a diode detector, which goes from approximately linear to approximately square law. I don't have any advice on the meter face. Maybe it would be best to connect a DPM in place of the analog meter. David DiGiacomo |
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3406A sampling meter/peeling faces
Greetings, recieved a 3406A sampling meter free, now I need to
brushup on what it is good for, and what benefits from sampling as opposed to regular RF meters. The question is concerning those Hp meter faces from a certain era that peel and crack at the mirror ends (glued so well to brass mirrored back and contraction forces). There is a clear film that flakes up and off over the lettering and scale, the flaking stops at the letters, as if that helps hold it down. The stuff is water soluable, so if it is wiped it smears. My 428B meter also had this same problem except letters below also were flaking, had to photo copy a new one, a pain since I tried dozens of copiers around town and found most could not copy at 100%,(laid ruler along side meter face when copied so as to compare ), also cutting out a nice mirror slot again is shunned. The flaking has been nicely brushed off and I would like to overspay (masking the mirror) with something (even water will remelt the film) fast drying to prevent trouble below, wrinkling etc. Anyone else have ideas to save face. Iron on films are out of the question since heat on my 428B meter face caused fine cracks everywhere like fine art paintings. Hopefully that is all that is wrong with this meter since the lifting film stopped the needle from moving......... unless this occurred after the probe was found to be bad. Dave Robbins And In the Halloween spirit, might I say, BOO |
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Re: Can't ID Equipment
John Miles
Hi, Scott --
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What do you need for the 5370? I have a 5370B parts mule around here. -- john KE5FX -----Original Message----- |
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Re: Can't ID Equipment
Scott Newell
At 04:30 AM 10/30/2004 +0000, gerbo04 wrote:
As JM explained, it's certainly a 5345A. If you do decide to part it out, let me know...I'd be interested in the A12 (HPIB) board (which you may not have--it's not on the list you posted), a couple of EECL chips to fix my 5370, and maybe the hot rock box. -- newell N5TNL |
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Re: Can't ID Equipment
John Miles
That's a 5345(A?) counter. Reciprocal (computing) counter, one of the best
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ever made. Good to 500 MHz, 18 GHz+ with plugins. Crystal oscillator will be a 10545 or 10811; either are very good-quality standards. Unit as a whole is not good for anything without the front panel. -- john KE5FX -----Original Message----- |
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