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1. Circuit Diagram and Pattern

DEH-59,52,525,49,42,425,225,523,323,223

[Function and Operation

[GND forthe analogcircuit.

— CCi'"'CSC*CSCSC'idzC

Output pin for the spindle drive

Output pin for the sled drive

Output pin for the tracking drive

Output pin for the focus drive

Output pin for the focus balance control

Output pin for the tracking balance control

| Supplies current of positive voltage tothe analogcircuit ==

| Switches coefficient banks forthetracking filter, ==

[Pin No. [Pin Name _

BCK

«GND

finputpinfortheEFMsignal

linput pin forthe holdcontrolsignal =

[InputpinfortheRFOKsignal

linputpinforthe MIRRsignal

GND for the analog circuit

The signal input through these pins is digitized to 8-bit by the A/D converter,

OLD

74,75

VR2,1

which by operation of the assigned register, can be read into the microcomputer

inputs a focus-error signal fromthe RF amplifier ==

inputs a tracking-error signal fromthe RF amplifier

linput pin forthe trackingcomparator,

CCS

| Output point for midpoint potential for the A/D converter for the LSIportion _|

| Supplies current of accurate voltage tothe analogcircuit

EFOUT

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*UPD63702GF

IC's marked by* are MOS type.

Be careful in handling them because thty are very

liable to be damaged by electrostatic inducton.