4. Spindle Circuit

4-1-1. Block Diagram(FGCAV Servo)

 

 

 

 

 

 

 

Optical

 

 

 

 

 

 

 

Pick-up

 

 

 

 

 

Disc

 

HOP-7632TS

 

 

 

 

 

 

 

 

 

 

 

Motor unit

 

 

 

 

 

X301

 

 

 

 

 

 

 

 

 

IC301

 

VCK4M

 

XCO

33.8688MHz

 

 

 

 

106

 

 

 

 

Control Clock

 

 

 

R8J32007

 

 

 

 

 

 

Generator

107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XCI

 

SPD

SPD

 

 

 

 

 

SFG

P

M

CAV FD

 

213

 

 

211

 

 

 

W

U

+

 

 

 

 

R349

M

X

CAV PD

 

VCK4M

R361

 

R375

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Motor Kick

 

 

 

 

 

C349

 

REG

 

 

 

3.3V

 

 

 

 

 

 

 

1.65V

 

 

 

 

SPIN

 

 

 

 

 

 

 

SPD

 

 

 

 

U

12

1

 

 

 

 

 

IC601

DAVC

 

 

 

 

 

 

13

 

 

 

 

 

V

42

1.65

 

 

 

 

 

R2S30202FP

 

 

 

 

 

 

W

14

20

CTL1

 

 

 

 

 

CTL1

 

 

 

 

 

CTL2

21

CTL2

 

 

 

 

 

 

19

SFG

 

 

 

 

 

 

FG

 

 

4-1-2. FG CAV Servo

 

 

 

 

 

 

1) CD 48x CAV : CD-ROM, CD-R

 

 

 

 

 

2) CD 40x CAV : CD-RW

 

 

 

 

 

 

3) DVD 8x CAV : DVD+RW

 

 

 

 

 

 

4) DVD 10x CAV : DVD+R

 

 

 

 

 

 

5) DVD 12x CAV : DVD-ROM DL

 

 

 

 

 

6) DVD 16x CAV : DVD-ROM

 

 

 

 

 

 

7) DVD 16x PCAV : DVD+R

 

 

 

 

 

 

When drive read PRESS CD, Closed Session CD-R/RW, the spindle motor is controlled using FG CAV Spindle Servo. FG signal(R2S30202FP 19pin) input to SFG in DSP IC(R8J32007 213pin).

The spindle controller in DSP IC uses SFG as spindle rotation frequency feedback, therefore the FG CAV Spindle Servo doesn't work well if FG generation is abnormal.

The spindle controller PWM output signal SPD(R8J32007 211pin) input to SPIN in Drive IC(R2S30202FP 1pin) after Low-Pass Filtering.

The PWM output signal U, V, W signal(R2S30202FP 12, 13, 14pin) drives Spindle Motor without using a sensor, and FG pulse output is generated as 18 pulses/rotation.

53

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Image 49
LG Electronics GSA-4165B, GSA-4168B, GSA-4167B Spindle Circuit, FG CAV Servo, Optical Pick-up Disc HOP-7632TS Motor unit

GSA-4167B, GSA-4165B, GSA-4168B specifications

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