Pioneer PD-6050 Service Manual - Page 15

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TRACKING AND CARRIAGE SERVO SYSTEM

The above figure is a block diagram of the Tracking

and Carriage Servo System (Fig. 4-3).

The capacitor connected between Pins 14 and 15 is a

time constant that functions to drop the high-range

gain when TG2 is OFF. The peak frequency of the

Tracking Phase Compensator is also in reverse pro-

portion to the value of the resistor connected to Pin

23, and its peak value is approximately 1.2 kHz in

case of 510k 12 resistance value.

TM3 or TM4 is switched ON in order to make a

tracking jump in the FWD (forward) or REV (reverse)

direction, respectively. The peak voltage to be applied

to the tracking coil at this time is determined by the

current value of TM3 or TM4 and the feedback

resistor from Pin 18; that is:

Track Jump Peak Voltage =

TM3 (TM4) current value X feedback resistance

' TRK coil DCR

value X "

R52//R53

A FWD or REV carriage kick is . performed by

switching TM5 or TM6 to ON, respectively.

The

peak voltage to be applied to the carriage motor at

this time is determined by the current value of TM5

or TM6 and the feedback resistor from Pin 21; that

is:

Carriage Jump Peak Voltage =

TM5 (TM6) current value X feedback resistance

value X

—

R57

The current value at each SW is determined by the

value of the resistor connected to Pins 35 and 36.

When its resistance value is 120k 12, the respective

current values will be as follows:

TM3, TM4 = ±11 MA TM5, TM6 = ±22 MA

1 5