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HP 8568B bandpass filter alignment.

 

Hello, can anyone explain me how can i align the bandpass filters of the HP8568B to have it on SPEC?
My rig passes the self test but the values reported are a little out of spec. Non bad but i would like to have it in the<1db range.
But i don't' know what is the correct procedure to align the instrument.
?
Re: HP8568B HT BASIC and GPIB NI

 

i will try!
Re: 85662A CRT

 

Hi, Don,
Thanks for replying.? I've got a near perfect one coming from Vladan, but I'm glad to know there are some out there available to the group, as there were others who also had some available, in varying states of life.? If the shipper ruins this one, we'll be in touch.
Regards,
Matt
?
Trigger BOX E5818A

 

¿ªÔÆÌåÓý

Hi,

?

I have an E5818A, and I'm trying to find the procedure to send a SCPI command via LAN so that the E5818A sends a pulse on the BNC TTL1 or TTL2 port, is anyone familiar with this trigger BOX.
Re: 85662A CRT

 

Matt,
??? Where are you located? I have 4 good 85662A CRT,s that have been stored properly for the last 20+ years.? They were pulls from 85662A's that had an arc over issue in the post lead - poor insulation issue. They were factory warranty repairs. I have known good post leads with each one. If interested call me, or email me.? I am in the Chicago, IL, USA metro area.

Don Bitters
donbitters@...
cp 224-406-4059
Re: 8566B Performance Verification with 8620C

 

If it is any consolation, I also cannot afford an 83650A/B/C/D/E/L.? I did work with/use them when I was gainfully employed. I do have an 8341B, but have to repair the? output first.

Don Bitters?

Re: HP8568B HT BASIC and GPIB NI

 

With my limited experience with both HT Basic and NI GPIB portal, I found that the default main bus ID was 7xx on HT Basic and the NI GPIB portal defaulted to 14xx main bus ID.
It is possible than you need address 1418 instead of 718.

Don Bitters

Re: 35665A PSU disassembly

 

Hi Jeff,

I realize this is a 3 year old post but I found your message while
writing the hp wiki entry for the device.

The service manual (which I have a paper copy of now) doesn't talk
about the power supply in detail. It has 3 or 4 RIFA capacitors and
you will want to replace them. To separate the halves you need a set
of medical forceps to squeeze a plastic PCB standoff that is used to
hold the thing together internally. They were really worried about
vibration with this thing.

-Evan

On Mon, Jul 5, 2021 at 9:19?PM Jeff Keyzer <jeff@...> wrote:

What is the trick to getting the case halves apart? There¡¯s a plastic standoff that holds one of the PCBs to the case. This prevents the case halves from separating and I haven¡¯t figure out how to release it.



In the absence of a service manual, any tips?



By chance I was reading the memory upgrade procedure (35665-90060) which mentions a screw in the location of the standoff and says ¡°the power supply assembly will be damaged if the center screw is removed¡± which is a bit unnerving. However, on my PSU there is no screw, just what appears to be a solid metal press fit insert.



Jeff



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Re: Artek Manuals and HP 3325B

 

Yes, Artek finally came thru and I was able to repair the unit. ?Root cause of the errors was the 30MHz crystal in the VCO was not oscillating. ?Injecting external signal at the test point restored operation. ?I then removed the crystal and tested it with my 3585A. ?It looked good, so I put it back in and the unit started working. ?I am guessing that the heat of removal caused it to start being a crystal again, weird. ?Either way it has been stable for several weeks now thru multiple power cycles.
--
Tim Wright
Senior Engineer
Cumulus Media Chicago - WLS-AM
AL7DS
Re: 8563EC LCD problem

 

If I stare at it cross-eyed long enough, it reveals the secret of the universe in a 3 dimensional form!
;)

Maybe a small butane torch will make short work of Loctite on the screw threads?
Re: Anyone able to do GC or GC-MS on Hp ThinkJet Black ink ( for the Hp ThinkJet 2225 printer; Hp 9226a Or Hp 51604a ink cartridges ) ?

 

?
Yup:?
??? Anyone have access to a GC-MS lab that might want to elucidate the ThinkJet ink adventure ?
?
Expected major components in the? Hp 51604A ?Thinkjet black ink cartridge:
? ?( ?3.0mL to 3.7mL ; 0.13 fOz)
?
2-Pyrrolidone
Ethelyne Glycol
Food Back 2
Acid Salt 3
water
?
UFI: 6UE7 - CQTV -A205 - GHXV
?
Possibly the MSDS ?(Materials Safety) data sheet ( inserted into product box ), might have additional information ?
?
.... but would be nice to have the GC-MS results,? so that one could make one's own ink, ? as a DIY project !
?
thank you,
rick
?
?
Re: 8131A Error F500

 

¿ªÔÆÌåÓý

?

Hi,

?

I have an 8133A, I can imagine how it is built inside the 8131A.

?

In the service manual you have the electrical diagrams.

The error E304 concerns channel#1, so channel#2 should work fine.

By comparing the two channels it would be possible to follow the path and find the faulty section.

?

I don't know if you have already attempted this repair, but there is a lot of information in the service manual.

?

Yves

?

?

?

De?: [email protected] <[email protected]> De la part de vee-dub565 via groups.io
·¡²Ô±¹´Ç²â¨¦?: 2 octobre 2024 01:36
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] 8131A Error F500

?

Well after 6 months on sale on various platforms with no interest. I've now picked up another 8131a, dual output this time hoping to at least make one good one out the two.

?

Powered it on annnnd..... E304 error, exactly the same as the one I already have.?

?

So now I have two doorstops. No wonder nobody wants them.?
Re: 8350A RPG 5060-9444 questions

 

¿ªÔÆÌåÓý

Hi,

This was a fun little project to fix this RPG.

The reflector serves as a support for the lamp and also to deflect more light into the tunnels, the amount of light can be controlled by blocking the tunnels towards the photodetectors with two screws.

The reflector was just a lightly polished piece of metal, so it was an easily replaceable part if needed.

?

When I replaced the lamp with an LED, I didn't need the reflector anymore since the LED covered the tunnel entrances enough.

?

I've fixed two of these RPGs, and I've never had a problem since.

?

Happy repair.

?

Yves

De?: [email protected] <[email protected]> De la part de bumbo.chinelo@...
·¡²Ô±¹´Ç²â¨¦?: 2 octobre 2024 11:06
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] 8350A RPG 5060-9444 questions

?

Thank you Yves

Precious feedback yours. The detail of the 45 degree piece of metal is interesting; in both of mine it was missing. Wonder if it is a peculiarity of 8350A or maybe someone else was in there before me and forgot? it.? From your foto now I understand how the lamp is kept in place

cheers
Re: 8350A RPG 5060-9444 questions

 

Thank you Yves
Precious feedback yours. The detail of the 45 degree piece of metal is interesting; in both of mine it was missing. Wonder if it is a peculiarity of 8350A or maybe someone else was in there before me and forgot? it.? From your foto now I understand how the lamp is kept in place
cheers
Re: Looking for a copy of the 4263B Adjustment Program, part number 04263-65005

 

Still looking a few months later.... Anyone happen to know of the whereabouts of a copy of this cal software?
Re: 8131A Error F500

 

Well after 6 months on sale on various platforms with no interest. I've now picked up another 8131a, dual output this time hoping to at least make one good one out the two.
?
Powered it on annnnd..... E304 error, exactly the same as the one I already have.?
?
So now I have two doorstops. No wonder nobody wants them.?
8563EC LCD problem

 

I was given one of these spectrum analysers presumably because the owner didn't think it could or was worth getting fixed. After fixing the power supply, which was a fault caused by two small electrolytics developing a high ESR, the unit powered on and all voltages were as specified.
?
But now I am confronted by a LCD display problem that I can't find a way to progress. Hopefully someone has seen a similar issue and can point me to a solution. Connecting external VGA monitors did not produce any type of display. The best I got was a monitor saying the mode was unsupported.
?
Trying to pull the 8563EC apart to access the LCD itself has proved difficult. I suspect some thread lock glue has been used.
?
?

PXL_20240930_025324833.jpg

Re: Artek Manuals and HP 3325B

 

Were you able to get the schematic you need for the HP 3325B repair? I
have the paper copy if you need a few pages scanned or something while
you wait for the artek copy.

On Mon, Sep 16, 2024 at 11:11?AM Tim Wright via groups.io
<al7ds@...> wrote:

I have an HP 3325B on the bench that has some issues. The service manual is very detailed, and gives a logical and easy to follow troubleshooting procedure. Problem is, the SM download from the HP site is so low resolution that the board layout and chip locations are impossible to read. I ordered the manual from Artek for digital download last week via their website, and have heard nothing back on the download link. Emails and calls have gone unanswered. Anybody know what is up?
--
Tim Wright
Senior Engineer
Cumulus Media Chicago - WLS-AM
AL7DS


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Re: HP 3310A Repair Advice

 

Hi Antonio,
?
Thank you for the thought.? I did see a mention of this in an old posting here from around 2016 IIRC.? I did check all of the PCB connections around the previous repair to the board in case someone was sloppy but I could not find any issues.
?
I'm sure there is a clue from the behavior of the unit presently -- specifically how the triangle generator ramps up but then edges down when it (A1TP4) hits +6.5V (should be +5V).? And how the bottom of the waveform varies in voltage depending on the frequency dial setting (current source/sink setting).
?
If you're curious, I've uploaded waveforms from various test points over on eevblog where I've another thread on the unit: ?
?
Re: HP8595E - SYTF

 

Haha, that looks a lot like my collection of Lauer tips. Hope you have the right size already. Good luck.?? Ed
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