Sony dvp-s530d 사용자 설명서

The three beams of light are reflected from the disc and returned to the
optical assembly.  They land on the photodetectors within these three
groups.

E

F

A

D

C

B

G

H

KHM - 220AAA

P H O T O   D E T E C T O R S

The voltages from these detectors are matrixed by RF Amplifier IC001
that follows (on the TK-51 board) into servo correction and disc identifica-
tion signals.

Photo Detector Manufactured Signals

Photo

Detectors

Signals

Produced

Purpose

A – D

TE (DVD only)

FE, PI, Mirr., RF
(eye pattern)

TE – DVD tracking error

FE – Focus error

PI – “Pull In” is the analog sum of A-D
detectors used to ID the disc and
create MIRR.

MIRR – mirror signal goes high (4V) if
PI is above a threshold. MIRR is used
to count tracks and ID the disc.

RF – Audio and Video Data

E, F *

TE +, TZC

CD Tracking error, track count.

G,H *

TE –, TZC

CD Tracking error, track count

*In CD and older DVD players, there are only two outer tracking error
detectors (E & F).  In this new laser assembly, two outer detectors were
added but they are not used in this player.

The extra detectors are to permit this laser assembly to read DVD-R discs
in future players.  This DVD player cannot play DVD-Recordable discs
even though the laser has the ability to do so.  Detectors E & F are added
together and treated as one.  G & H detectors are also added in the matrix
/ RF amp IC001 that follows (not shown).