Marantz  1820 (5000) Cassette Deck Motor Speed Adjustment @OldSchoolElectronics
Marantz  1820 (5000) Cassette Deck Motor Speed Adjustment  @OldSchoolElectronics
Uploaded March 2017 | Updated September 2026, 2 weeks ago
Internal speed potentiometer was adjusted to set motor speed to slightly over 3,000 Hz to compensate for future wear and tear; for example, belt wear. It was set to around 3,015 Hz; therefore still being within 1% accuracy. The 1% meaning that the acceptable frequency range is from 2970 to 3030 Hertz.

Tools and instruments: small flathead screwdriver, 3,000 Hertz test tape, and frequency counter.
Marantz  1820 (5000) Cassette Deck Motor Speed AdjustmentHeathkit IT-28   Part 1   First LookNAD Stereo Receiver 7030   No Output
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Marantz 1820 (5000) Cassette Deck Motor Speed Adjustment

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