HST-D501CDM Tape Transport Mechanism

The HST-D501CDM (XO-D501) tape transport mechanism (TTM) is advanced and has auto reverse facility. It uses cogwheels for driving the tape winding spindles and therefore their performance remains the same when compared to rubber surfaces that wear out. This mechanism also has full-auto stop facility and can stop at the completion of rewind and fast-forward operations. It also has tape sensor switches and sets the bias automatically for different types of cassette tapes. Consequently, the manufacturers did not have to include manual selector switches making the hi-fi look simpler from the front.

Speed Adjustment

After changing the belts, you will need to check the speed in normal and fast modes. To do this you will need the Sony WS-48B test tape with 3 kHz (at 0 dB) sine wave tone, and a frequency counter. For normal speed, the frequency counter should read 3000 Hz ±30 Hz, and for the high-speed mode, the counter should read 6000 Hz ±60 Hz. The adjustment presets are within the motor casing through the holes marked N and H.

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