Hi Bob, My comments are below: This could be a side effect of +15V issue, their opamp uses +15V. I recommend fixing the +15V first to see if they recover. This is probably why your +22V is showing

Added oscillograms to "photos" data base just now. ...

Hi Ozan, thanks for the help , I really appreciate it . I and add images of the voltages but it seems indirect in this forum. Q: Which supplies have the 60Hz dips? It could point to a bad rectifier

I think the finger of blame points very much to failure of one of the rectifier diodes. The bulk smoothing capacitors often have the electrolyte dry out with age and they go low capacitance, high ESR

Which supplies have the 60Hz dips? It could point to a bad rectifier diode as you also mentioned. How low does +55V supply dip? Another possibility for +22V to supply too much current is if input to

Hi Dave, after some serious procrastination, I decided to check the calibrator voltage and current output to see how it looked ... it was unstable in both the time and voltage domains but nominally

Yepp!! That's what happened to me too... the physical power switch was off and all I've heard was the sound of opening a shaken soda can before the breaker tripped, the smell of nasty chemicals filled

There is already a full blueprint available for this in the uploads section as I recall. I downloaded one from there done time ago with the intention of making a few to help some fellows out who might

Hi Gregg, You can upload pictures to the groups.io site for this group. I managed to repair my broken collet but a new one would be nice. I wish I had a lathe and a milling machine... Welcome to

Hi Guy, This is the link: https://www.eevblog.com/forum/repair/csa7404b-tds7404b-repair/ Greetings, Egge Siert

I mentioned in my intro that I had made a new collet to replace the one which secures the fan impeller on my 2465, which is the same as those found on many Tek scopes. I tried sending a picture of

Hi Egge, I've not seen a TDS7000B Acq. board, so I can't comment. If you can send me a link to a hi-res image I can compare to the TDS7000 Acq. boards I have here. What bandwidth are you looking for

Hi Guy, Thank you for your reply. Yes, I am aware of the Trigger Chip (156-8278-00) problem and looking at some TDS7000B Acquisition Board Pictures (eevblog) I don't see these anymore. A reason to

si_emi_01 <wellington@...> added folder */ITU-T G.703 Specification - 1PPS Specification* --- The following files and folders have been uploaded to the Files area of the TekScopes@groups.io

Hi Egge, I've repaired both types without drama. If the NVRAM is separate to the battery, check the leakage current and if necessary replace the NVRAM too. It's easier to de-solder than a

Is this where we insert the public service message from the Talking Heads? https://www.youtube.com/watch?v=_3eC35LoF4U -- Chris Elmquist

Luca, I had never had a RIFA go out on me before either until I had one in an HP signal generator burn up while the generator was turned off. That was an eye opener: I had not considered that the

Thanks for mentioning the thread.. it just confirms my suspicions that there is a possible hazard and I already had one of these things (not Schaffner branded, but still) stink up my apartment, so I'm

Thank you for accepting me into this group. I'm a retired electronics design engineer; that is, "retired" to the extent I no longer go to a job. I do however stay very active with my own small

I just happened to notice this cross over between groups. There's a conversation going on in the HP/Agilent/Keysight group regarding RIFA caps, and the question Schaffner filters is broached there as