| 摘要 |
PURPOSE:To attain the adjustment of stylus lift-down position, the adjustment of inter-music sensor sensitivity, the adjustment of music selection circuit and the adjustment of stylus drop-off position for a record disc by constituting an inter- music part positioned before and after at least one part of the inter-music parts with plural concentric grooves on which different frequencies are recorded. CONSTITUTION:When a player is started and the stylus tip is dropped onto a groove 2d, since a change from the specified stylus tip drop position is recognized by recognizing the frequency of a signal recorded on the groove 2d, the stylus tip drop position is adjusted. Then the sensitivity of the inter-music sensor is adjusted so that an output of the inter-music sensor becomes a specified value on the flat part 3. The stylus tip is dropped on grooves 2c, 2b for adjusting stylus tip drop position at music selection finally at the music selection mode and the position of stylus tip is adjusted so as to obtain the specified stylus drop position at the music selection. |
