How to calibrate a cassette power meter
It uses a pair of clock springs that get twisted by the motors and you can read off the force from the dials. This is the reading on "play" (you test play, FF & RW of course) The service manual calls for 50-100 g-cm. To calibrate it, first you'll need to inspect the belts, idler tire, and any gears that may wear or be cracked. This specification describes in decibels the difference between the two limits which confine all tape—the maximum acceptable signal (the maximum output level or MOL) and the inherent noise level of the tape (Fig. This comprehensive guide will take you deep into the world of power meter calibration.
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