Pioneer CX-692 Service-Handbuch - Seite 10

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CX-692

Feed kick mode jumping

The feed kick mode jumping is being executed by the

feed

kick

command

microcomputer(IC501:PD5511A).

direction and the number of jumping tracks (512 -

32,767) are being designated by the command.

Receiving the feed kick command, the servo DSP

(IC401:TC9461F) works to open the tracking servo circuit

to apply the kick signal to the rear stage of the carriage

EQ to drive the carriage motor to execute jumping.

The signals to be applied at this time are being so

profiled to carry a time constant in their leading edges

and, also, it is so designed that the voltage is lowered

when the number of remaining tracks decreases to

bring down the moving speed of the carriage.

Equalizer

Hysteresis

being

issued

the

The jumping

Feed kick jumping

Thus, the speed is being lowered just before a jump is

finished to facilitate taking-in action by the servo when

the jump has been finished.

Meanwhile, when a track jumping has been finished, in

order to stabilize the taking-in action by the servo, the

tracking servo gain will be raised for about 11 to 12mS

after a jump has been finished, or with some jumps,

hysteresis movements for about 2 to 3mS are being

employed.

11-12ms

2-3mS

GAIN UP

NORMAL

OFF

Fig. 11