Pioneer CX-3195 Посібник з експлуатації - Сторінка 12

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1.2.3 Carriage servo system

The carriage servo system inputs the output of the low frequency component from the tracking equalizer (information on

the lens position) to the carriage equalizer, and, after the gain is increased to a certain level, outputs the drive signal from

the CD of the LSI. This signal is applied to the carriage motor via the driver IC.

Specifically, since it is necessary to move the whole pickup to the FORWARD direction when the lens offset reaches a

certain level during the play mode, the equalizer gain is set to output higher voltage than the carriage motor starting

voltage at this time. In actual operations, a certain threshold level is preset in the servo LSI for the equalizer output, and

only when it exceeds the threshold level, the drive voltage will be output. This can reduce the power consumption. Also,

before the whole pickup starts moving, the equalizer output voltage may exceed the threshold level a few times, due to

such causes as eccentricity of discs. In this case, the output waveform of the drive voltage from the LSI assumes a

pulse-like form.

IC201 PE5547A

From

TRACK EQ.

KICK, BRAKE

Fig.1.2.7 Block diagram for the carriage servo block

Fig.1.2.8 Waveforms of the carriage signal

DIG.

CONTROL

REGISTERS

TRACKING DRIVE

(LOW FREQUENCY)

LENS POSITION

DRIVE ON/OFF THRESHOLD

CRG DRIVE

(INSIDE UPD63711GC)

CRG MOTOR VOLTAGE

IC301 BA5839FP

PWM

111

CARRIAGE MOVED AT THESE POINTS

CX-3195

LCOP

LCOM

CARRIAGE

MOTOR