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It quickly became my primary oscilloscope due to small size and big features and soon it was my only scope as I sold off the others. Then 'some day' became today. The fancy blinky-lights and buttons on the CPU-controlled 1590A are spazzing. Some buttons don't work and those that do activate totally unrelated functions. Soul Assassins Intermission Rar Extractor on this page.

I'm left wishing for mechanical switches. Where do we start? I'll tell you. A few years ago I found this wonderful Tektronix manual on (analog) oscilloscope diagnostics appropriately titled Troubleshooting Your Oscilloscope []. Blocks and Their Functions How does an Oscilloscope work?

By plotting voltages versus time. Oscilloscopes are designed and built in blocks of circuits. If you know what the blocks are and what they do, you can identify which block is causing problems.

Turbotax Business 2012 Rapidshare Downloader here. While other sites () provide more detail, here's a quick overview of the blocks and their functions. Referenced here from for educational purposes Vertical Pre-Amp Oscilloscopes draw a voltage waveform on a cathode ray tube (CRT) by sweeping an electron beam in the X and Y directions. The vertical pre-amplifier takes the voltage of the signal and scales it. When you manipulate the volts-per-division knob, the vertical position knob, the mode (CH1, CH2, DUAL, ADD), you're controlling the vertical pre-amp. Vertical Amplifier The vertical output amplifier converts the output of the vertical pre-amp signal into a high voltage that vertically deflects the electron beam in the CRT. Sweep Generator The beam also sweeps left to right at selected intervals, thanks to the sweep generator block.

When you change the time/division knob or the horizontal position, you are controlling the sweep generator. It generates a sawtooth sort of waveform that's amplified to hundreds of volts by the horizontal amplifier to deflect the CRT electron beam left to right. Power Plant System Design Ebook Cover. Blanking Circuit When the sweep reaches the maximum (the beam reaches the far right), a blanking circuit turns off the beam until the sweep waveform returns to zero. Horizontal Amplifier The output of the sweep generator is fed into the horizontal amplifier to generate a high enough voltage to deflect the electron beam horizontally. Trigger To make sure you see the same shape every time the scope sweeps the electron beam, a trigger block makes the sweep generator wait at zero until the input signal reaches the trigger voltage level you've set. The blanking circuit is then disabled and the beam begins tracing at the same input voltage as last time. In other words, the trigger circuit synchronizes the sweep generator to the waveform.

Power Supply As with many electronics, if the power supply goes bad, all sorts of problems occur. That's what was, for example. And an analog CRT oscilloscope has several power supplies: logic level 5V supply, medium voltage supplies for pre-amps, and high voltage supplies for the CRT. Diagnosis After messing with the malfunctioning scope haphazardly, scratching my head, and being overwhelmed by the circuit diagram (these are steps -2, -1, and 0, respectively), my 'first' step was to systematically take detailed notes on the oscilloscope's symptoms and behavior, what was working, and what wasn't working. Basically you use the front panel controls to determine with what major block the problem lies.