This tutorial in intended to show how one may determine the test points for the onboard DC-DC converters, spindle motor, voice coil motor (VCM), and preamp supply rails of an unfamiliar HDD PCB. We also identify any protection devices. I have done as much as possible in the absence of power in order to simulate a non-functioning PCB.
Tutorial - locating the basic test points of an unfamiliar HDD PCB:
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The above is a work in progress. I expect that the completed work will eventually be moved to ...
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- Franc Zabkar