Pioneer DEH-3770MP Bedienungsanleitung PDF herunterladen (Seite 11)

CX-3158

1.2.3 Carriage servo system

In the carriage servo system, the low frequency component from the tracking equalizer (the information on the lens

position) is transferred to the carriage equalizer, where the gain is increased to a certain level, and then sent out from

the LSI as the carriage drive signal. This signal is applied to the carriage motor via the driver IC.

During the play mode, when the lens offset reaches a certain level, it is necessary to move the pickup toward the FOR-

WARD direction. The equalizer gain is adjusted so that the output over the carriage motor starting voltage is sent out

in such a case. In actual operations, only when the equalizer output exceeds the threshold level preset in the servo

LSI, the drive signal is sent out. This can reduce the consumption power.

With an eccentric disc loaded, before the whole pickup starts moving, the equalizer output may exceed the threshold

level a few times. In this case, the drive signal applied from the LSI shows pulse-like waveforms.

Fig. 1.2.7 Block diagram for the carriage servo block

Fig. 1.2.8 Waveforms of the carriage signal

DIG.

KICK, BRAKE

REGISTERS

CONTROL

PWM

UPD63763GJ

From

TRACK EQ.

LCOP

LCOM

BA5835FP

CARRIAGE

MOTOR

105

DRIVE ON/OFF THRESHOLD

CARRIAGE MOVED AT THESE POINTS

TRACKING DRIVE

(LOW FREQUENCY)

LENS POSITION

CRG DRIVE

(INSIDE UPD63711GC)

CRG MOTOR VOLTAGE

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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