Pioneer CX-692 Service-Handbuch - Seite 4

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CX-692

Focus-jumping circuit

IC401

FOO

Described below are the explanations of the basic

movements.

When the focus-jumping command is issued from the

mechanism controller (IC501:PD5511A), the input to the

focus equalizer is changed over from the AD converter

output (FOO) to the DC hold filter output and DC

holding is effected.

Simultaneously, the focus search drive signals are

output through the TESIO0 pin and the TESIO1 pin. By

the circuit shown in Fig. 4, these signals are made to

apply drive signals to the focusing servo loop which

work to drive the focusing actuator to complete the

layer jump.

Normal state

FOJ

While focus-jumping

is in progress

Q401

Q402

IC304

BA6797FM

IC402

NJM2904M

Fig. 4