Pioneer CX-692 서비스 매뉴얼 - 페이지 12

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CX-692

1.5.3 CARRIAGE SERVO

To drive the carriage servo, the outputs from the

tracking equalizer will be input into the carriage

equalizer and, after adding a certain gain to the low

frequency component (lens position data), drive signals

will be output from the servo DSP (IC401:TC9461F).

More specifically, when the lens offset reaches a certain

level while being played back, it becomes necessary to

move the whole pickup unit toward the forward

direction and the equalizer gains are so preset that

higher voltage than the carriage motor starting voltage

may be outputted at that time.

Meanwhile, as the actual movements, a certain

threshold level for the equalizer output is being preset

inside the servo DSP and the drive voltage will be

Carriage Servo Circuit

T EQ.

C EQ.

IC401

TC9461F

TRO

IC304

BA6797FM

DRIVER

outputted from the servo DSP only when the equalizer

output level exceeds the threshold level.

The above movement works to suppress the power

consumption.

Also, depending on the eccentricity of

the disc, the equalizer output voltages may cross the

threshold level for some times before the whole pickup

starts movement.

In such case, the output waveform

of the drive voltage coming from the servo DSP will

become pulse form.

CARRIAGE

MOTOR

Fig. 13