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SECTION 5
MECHANICAL ADJUSTMENTS
To adjust the mechanism section, enter the mechanism section adjustment mode.
For how to enter the mechanism section adjustment mode, refer to each adjustment section.
DISC SENSOR ALIGMENT
1. Make sure that there is no disc in the unit.
2. Connect an oscilloscope to TP501 of the AUDIO board.
MAIN board
TP501
GND
TEST
SENS
SENS (CH1)
TEST (CH2)
GND
oscilloscope
3. While pressing the CLEAR and PLUS ONE buttons at the same time and turn ON the power.
POWER switch
PLUS ONE button
≠
button
±
button
CLEAR button
CHECK button
4. The fluorescent indicator tube shows as follows, and the mechanism section adjustment mode is set.
PLUS ONE
5. The disc table rotates in the clockwise direction. The disc table rotation time is displayed with ‘’PLUS ONE” slit as a measuring point.
6. Press the CLEAR button, to be rotated the disc table counterclockwise.
7. Measure the waveform of the oscilloscope when the disc table is rotating.
DISC No.
Rotation time
**
3.8
DISC
51
Blinks
SEC
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