DVD P.W.BOARD OPERATION. Sanyo FISHER DVD-S1500, FISHER DVD-1500 AU

DVD P.W.BOARD OPERATION

General operation diagram

This is a basic explanation.

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DVD P.W.BOARD OPERATION

(Actuating description)

1. After turning on the power or inserting a disk, this DVD Assy starts to perform a disk identification operation.

1) Sets the circuit to the DVD mode, returns the pickup, lowers the lens an lights the LASER lamp.

The pickup return, lens operation and LASER lamp illumination are visuall recognizable.(spindle kick)

2) In PU mode (CD), raises the lens.

Focus level measurement (A), judges the FE pulse whether to be 1 or 2.

3) In PU mode (DVD), lowers the lens.

Focus level measurement (B).

4) Judgment pulse 2 : DVD two-layer disk,

(B)/(A)>1.5 : DVD one-layer disc.

Other than the above condition : CD

5) Sets the circuit to the PU mode (based on the above disk judgment, the circuit is set to the PU mode)

6) Servo attracting operation (servo turns on):CLV turns on in the same way as a CD player.

FOCUS DRV.

IC601 25pin

The orientation that optical lens

Focus error signal （ lens distant → near ）

Image

Focus point

① ② ③

⑤ ⑥

DiskDistinction

④

Don’t Servo on

FE

TP513

TE

TP512

FServoCLV ON

TServo ON

SLED

IC601 20pin

Servo on

VRA pick return play (If there is pick in perimeter of a circle, there is it, and time of bottom gets longer)

Disc distinction

Disc distinction

CD

Disc distinction

Disc distinction

DVD one-layer disk

Zoom level difference

Disc distinction

Disc distinction

DVD t w o - l a y e r disk

Two Focus err.

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DVD P.W.BOARD OPERATION

2. Automatic servo alignment

Contents of the servo alignment and the alignment method

1) Tracking balance

Performed automatically by the TC9461 based on the command

2) Focus balance given by the micon (microcomputer)

3) Focus gain

4) Tracking gain

5) RF gain

Set by the command the micon, reading the correction value of the TC9461, gives to the TA1254.

6) RF equalizer (DVD only)

The micon, monitoring the error rate (TC90A41), sets a PWM data (TC90A41) and provides a voltage for the TA1254.

FOCUS DRV.

IC601 25pin

FE

TP513

TE

TP512

SLED

IC601 20pin

DiskDistinction

Fsearch

Inner

ServoAdjust.

From Exter From inner

Data read

INIT Attention

Exter

ServoAdjust.

VRA

TC90A41F

Micon Setting to PU Equalize voltage

An automatic alignment method (e.g.

automatic alignment sequence) varies with the version of the micon. In any case, it is important to recognize that the abovementioned alignments are conducted regardless of the version.

P1FN

49

P1FP

50

LDP1

51

P1DI

52

P1CI

53

P1BI

54

P1AI

55

GNDR 56

LDP2

57

P2AI 58

P2BI

59

P2CI

60

P2DI 61

GNDS 62

P2FP

63

P2FN 64

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

APC1

32

DPDB

31

VccR

30 NC

29

NC sel-RF

R-gain

Adjustment

F-gain

Adjustment sel-PD

F-gain

Adjustment

T-gain

Adjustment

APC2 mode-IC sel-FE

FE

Generation sel-TE sel-DPD

DPDTE

Generation sel-LVL

3BTE

Generation

EQ

RF Ripple

Generation

28 RFO

27 RPP

26

RPB

25 RPO

FTE-gain

Adjustment

24 RPZ

23 VssS

22

DFTN mode-TE

TE-gain

Adjustment

Level

Detection

BUS

21

20

FEO

TEO

19 LVL

Time

Constant

Adjustment

18

VccP

17 VCKF

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

DVD : TC90A41F

CD : TC9461F

TC9461F

DVD : PLCK (27MHz)

CD : BCK (1.4MHz)

Amp mode setting focus gain: F-gain, FE-gain tracking gain : T-gain, TE-gain

RF gain : R-gain

TE : mode-TE (DPD or 3beam)

Micon I / F

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DVD P.W.BOARD OPERATION

3. Data reading

(1) The SLED control is performed by the control output "FMO" (TC9461, pin 48), which reaches the IC601 via the

IC605 and drives the SLED motor.

(2)The SPINDLE control is performed by the control output "DMO CD" (TC9461) in the case of a CD, and "DMO DVD" (TC90A41AF) in the case of a DVD, which reaches the IC602 via the IC605, whose reference voltage is set by the DVD/CD* of the micon, and drives the SPINDLE motor (brushless motor).

The reference voltage is 1.65 V for a DVD, and 2.1 V for a CD.

(3) The PLL control is conducted by the TC9461 for a CD, and by the TC90A41AF for a DVD.

(4) An output is in accordance with the respective disks.

CD :TC9461 serial data (BCK, CDDATA, LRCK, C2PO) output (CN802)

DVD:TC9461 serial data (BCK, CDDATA, LRCK, C2PO) and this are inputted into the ROM decoder (IC802), converted to the

MPEG decoder signals (parallel data) and then outputted (CN801).

DVD:TC90A41AF MPEG data:parallel signals (SD0-7, SERR, SBGN, SENB, SDCK and SREQ) are inputted into the ROM decoder (IC802), decode the digital copy protection and are converted to the MPEG decoder signals (parallel data) and then outputted (CN801).

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DVD P.W.BOARD OPERATION

(GENERAL FLOW)

Turn on power.

Depress open/close switch.

Tray opens.

Place a disk on tray.

FE pulses; one or two

1

(b)/(a)>1.5

YES

One-layer DVD

2

NO

Sets one-layer

DVD circuit to pickup mode.

Sets CD circuit to pickup mode.

Depress open/close switch.

Tray close/closed

"LASER" lights.

Lowers lens

(approx. 400 ms).

Pickup returns.

SPINDLE motor turns on.

8/12 cm identification.

FG confirmation

Rotates at a speed of approx. 0.7 time that of CD

Lowers lens with each IC in DVD mode

Measures FE level (a)

FE pulse 1 or 2

Lowers lens with in

LCD and DVD mode

Rotates at a speed of two times that of CD

Measures FE level (a)

Two-layer DVD

Sets two-layer

DVD circuit to pickup mode

This is a basic flowchart.

INIT processing of

TC9461

Laser off 20 ms

Laser on.

Lowers lens

Rotates SPINDLE at a speed of twice that of CD.

Waits for prescribed number of rotations to be completed.

Checks FG.

Raises lens.

FOCUS OK?

YES

NO

Waits for approx. 500 ms.

New disk?

Old

New

Layer jump

Tracking balance alignment

Rotates at a speed of twice that of CD.

Waits for 100 ms.

DVD/CD

DVD

TRACKING ON

SLED OFF

200ms wait

CD

Sets to normal speed.

100ms wait

ADDRESS CHECK

Focus balance alignment

Focus gain alignment

Tracking gain alignment

SLED ON

OK

Error judgement

NG

Aligns tracking balance

OK

Error judgement

NG

TIME OUT:ERR.

CD

One-layer

One-layer or two-layer

Two-layer completed

Two-layer completed

Measures p

Pickup moves outward.

Optimization

DVD/CD

CD

DVD

Measures error rate

OK

Error judgement

NG

Aligns tracking balance

OK

Error judgement

NG

EQB

OK

Error judgement

NG

EQF oor playability varlue

READ-IN play

CD : TOC READ

DVD : CSS processing

DVD

CD/DVD

CD

STOP

RF gain alignment

Optimization

Wait to PLAYBACK

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