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I would start working through the Performance Check and Adjustment sections A (power supply) and B (z-axis and display) of the service manual. Do you have a high voltage probe so you can check the

OK a complete electrolytic replacement job includes the two Sprague 36D7560 950uF, 200V main input filter caps - the ones with the 3/4" spacing screw connectors. What do you use to replace

Thanks David and Tom- Any idea about where to start looking for why there's no trace/BF? I did as Tom suggested and tweaked the R1513 to put it at exactly -50V. Now the readings are: +15V =

The 7904 I just got and one of my 7834s sort of do the same thing. With the 7904, the more power the plug-ins draw the more likely it will tick a couple times when cold starting. The 7834

Adjust the -50 to exactly -50.00 volts. All the other voltages depend on the -50. Note the exact x10 relationship with your -49.4 to the +4.94 measurements. Tom

More news on this ongoing project. Short story- after replacing a cap in the -54V circuit (C1364) the PS would finally start working. This is with the PS connected normally to the mainframe. That's

like For 50 ohms explanation you need to read Tek's Concepts and Circuits books on this topic. The two probe books are downloadable from here http://www.slack.com/concepts.html There is one on

Hey guys, I am still pretty new to this forum, as well as my understanding of the inner workings of oscilloscopes. I've been following Kent Lundberg's "Reading Jim Williams" blog and found it very

With the BW of the 2247, this is correct. With higher BW scopes, such as the 2265 and TDS 3000 series more than just the input C matching needs to be considered. The probe series compensation

Bob Check your E-mails. I have an xfmr for you.

To kill two birds with one stone if you will I will reply here: “Rob can you confirm if the 7704A shows any dot without plugins installed?” After alignment the 7K scopes in general do not

The horizontal U700 shown a CTO in pin 7 cap made in PCB, I suppose for the fastest sweep,could for any reason this cap increase his value..dirt perhaps..? Can I remove the heat-sink of U700 to see

Hi Nick!. The 2246 input channel has a X10 & X100 att controlled by K102 & K103 at the front end of U112. At the back end of U112 you have an other att X1,X2,X5 controlled by K104 & K105 . There may

I found that my cheap Chinese AideTek x1/x10 100MHz probes which are rated from 15pF to 35pF actually managed to barely make it to 47pF on my 7A22. For best performance, the probes used for

Thank you for your input. Even into the 7103 the 7A26 limited to 20MHz shows a thin trace. As for the 7A22 input capacitance, I have two of them recently acquired, and only one old (cheap) 60MHz

My 7603 (100 MHz) CRT has a lot of hours on it but comparing it to my faster 7000 series oscilloscopes, I find that the plug-in matters more than the mainframe as far as noise which is what I would

A "meshless" CRT would have to be much longer to achieve the same deflection (screen display size) at the bandwidths of the upper 7000 series. The fuzziness and other abberations due to the electron

Thanks for the replies. iglesia_cristiana_arpas_eternas, I am not sure what you mean by the "back attenuator works with the front one" I do see where there is a cascading arrangement, meaning, the

From time to time, people will attach pictures to their Tekscopes emails and it becomes a mystery to me as to where the attachments go. If you log into yahoo groups, (this is the link I used,