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I would love to have a 3B3. I have been halfway looking for one to jump in my lap, but it hasn't happened yet. All I have for my 561A and R564B Mod 121 for timebases is 2 2B67's.

All suggestions a comments are help Joel, and I take them into consideration. When I hook it back up to the scope with the extender, the voltage checks will find the problem, if it is rail related.

Okay, so we know the problem is within the 3B3. I'd start by putting your two 3B3s side by side and comparing the wiring of the plugin connector. Start with the 2 wires for the horizontal output. If

Well, I must respectively disagree. My opinion is that the B Sweeps should be superimposed over the top of their respective Time Markers. My reasoning is that I believe that this is calibrating the

Hi Ozan, The 10v on TP901 is solid. Don't see any problems there. The output of U903, the OpAmp, is swinging +/-1.7v and TP911 on U900 is +/-10v, so that also looks to be ok. Since this is turning

Hi, there seems to be quite a bit of activity on e e v blog. Tam -- - - - - - With best regards Tam HANNA Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab at

Rebonjour à tous The EEVBLOG links are indeed useful. This procedure is easier to do than to discuss. Just setup and try a few times, it will soon become obvious. As each cal proceedure is

To me, with all the different symptoms that are seemingly unrelated to each other, would seem to point to a power supply rail within the plugin that is either dead or way off spec. Just my opinion,

Mark Thank you for the clear, concise information. I will start studying the schematic to fully understand the areas you speak of. The fan comes off of the Low Voltage Secondary Supply of

Measuring pin voltages is the easiest path. Keep in mind if a voltage is wrong it doesn't automatically mean the IC is bad, voltage could be off because of some external fault too. If you report the

Olá, After getting the LV rails in order on this old scope, there is no vertical deflection. The trace sweeps horizontally just fine. Looking in the service manual, and following the

Just reposting... "I upgraded my Tek 2232 scope from the X-Y plotter to GPIB, so I have a G-8688-04 plotter board with trim panel and mounting hardware. The x-y plot module is in pretty perfect

A quick off Tek topic question... I have mostly legacy Tek gear, a couple of scopes, two spectrum analyzer, a TDR and a bunch of 500 modules and frames. Archived documentation is available and this

James: I'm glad that my suggestion helped you somewhat with your 455.? Your issues with the vertical deflection could be just about anything, but start by doing a visual check (and maybe a "wiggle

Hi Harvey, Yes, that does help to clarify the situation. I've still only tried this technique on ram-packed boards, which can just blend into a blurry multitude of components if you so as much

Nice one for the heads-up. Those two were indeed at fault and were replaced today. C582 with an electrolytic and C584 with a mylar (which I had never thought of doing before). All voltages are now

As to the issue with the plugin, it has me rather baffled. Been thinking about pulling my good 3B3 from the 564B, and literally comparing them to see if anything is different. The two plugins are not

Sorry for the late response. Ozan is correct. The bottom two traces are overlayed within 0.2 divisions to 1.2 divisions per the instructions. They typically are centered on the display. That's how

I would start checking TP901 to make sure it goes to +10V quickly and stays there. TP912 should be moving around for setting each voltage but shouldn't be too far off from +/- 1.71V across all the

I believe the intention of the calibration step is to match two zoomed B-sweep waveforms on top of each other for the best calibration accuracy. That is how I calibrated my 2467B few years back and