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Hi Jaap, This is Rogerio from Brazil. I own some 271x SA's that seem to have errors in the Display storage boards (most of them I could buy for a very low price from users (not companies) so there was

Look for a signal called x/y shutdown. It originates on the readout board (J2138), goes via coax to the horiz amp (J503), then a 2-pin ribbon (P504) to the main interface board (P38) and then pin BC

Attilio, That looks like there is a fault related to the vertical channel switch, U214 (schematic 3 - Vertical Interface). There is an input to U214 labelled 'X-Y shutdown', this disconnects the

Sorry, I wanted to add that moving the track only horizontally with the Position command of the 7B70 time base the readout does not move. -- Cheers Attilio

Thank you so much Tom, I will follow your precious advice, acting with the utmost caution. Excellent idea of ??taking a picture of the position of the filter adjustments before acting. --Cheers

thank you all I discovered an important thing: if I move the track vertically with the position command of the 7A16A plug-in also the readout moves as if it were a single screen, instead the readout

Hi Jeff, 5103N appears to be only the module mainframe, separate from the CRT unit. However I found the CRT circuit to be similar (if not identical) among the 5000 series models, so no problem there.

Mark: Doubt it is the A5 SMD cap, BUT that MUST be checked and fixed on any old 2465B. Any relation to the mains voltage, Check turn on with a variac? Suggest to open it and fix, and NOT exercise

Hi Mark, I would start by recapping the PS, the intermittend not starting makes me feel it's in there. The SMD caps on the A5 board would cause all sorts of funtions on the frontpanel not working as

I have a tek 2465B (serial# B077725, so could have the infamous SMD cap issues) that sometimes does not start. Typically, this is in the morning, and after I hit the switch 2-3 times, it starts. This

It is a pretty well known phenomenon... well discussed on this group over the years... often by me. Around about the time the 547/545B scopes got designed, tektronix decided to make a universal HV

Chuck, Please tell me more about the 564B HV transformer epoxy disease! Thanks! Pete On Sunday, January 3, 2021, 8:07:20 a.m. EST, Chuck Harris <cfharris@...> wrote: It is a cute little scope,

If I remember the threads properly, the thermal compensation (dancing readouts) fixed a small wobbling problem.? This sounded like a much larger deviation, and the picture I was thinking of was, say,

and I must be thinking of another 7K frame as I couldn't find it in the manual I have. It's also been called thermal compensation, or it may not be there on this model. But the symptom was dancing

No problem, Attilio! :) As to tuning the filter, it's very important to take a good picture (or several) showing clearly the initial state of all of the adjustments before you started adjusting them.

There is a low frequency compensation adjustment on the vertical output amplifier. If your power supplies are ok, check that next. -ls-

Thanks Tom, sorry, but I'm a little old and sometimes I miss something. I have read the cavity filter tuning procedure, the note that warns me that if you lose the signal it becomes almost impossible

Thanks Harvey, I have not yet tested the voltages and their ripple on the power supply, I thought it was a fault on the Readout board, but I replaced it and the defect remained. Tomorrow I'll check

Have you checked power supply voltages and ripple with the two sets of plugins inserted?? Wandering across the screen suggests both X and Y problems, and changing with load suggests power supply.?

Hi Attilio, I encourage you to read the article I linked you to earlier. You do have to retune the filter only a few percent. You cannot skip that step—the filter has a very steep rolloff so a few