Hitachi GCR-8520B User manual

Brand: Hitachi

Model: GCR-8520B

Type: User manual

This manual is also suitable for

GCR-8480B

Hitachi GCR-8520B is a CD-ROM Drive with an enhanced IDE interface and a built-in ATAPI Interface Controller. It supports IBM Compatible 486SX or Above systems and various operating systems, including MS-DOS, Windows, Solaris, Linux, Windows NT, and OS/2 Warp. The device features a 128k buffer and supports PIO Mode 4 & Multi DMA Mode 2. It has a sustained data transfer rate of 7,800KB/sec and an average access time of 80 ms. The drive offers various features such as power tray loading/ejection, 3-way eject support, and a closed enclosure.

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. MODEL: GCR-8480B

1) SUPPORTED SYSTEM

• IBM Compatible 486SX or Above (With PIO mode 4 recommended)

2) SUPPORTED OS

3) GENERAL PERFORMANCE

• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate

22Times Speed (Inner side) : 3,300 kbytes/sec

48 Times Speed (max., Outer side) : 7,200 kbytes/sec

• Data Buffer Capacity.....................................................................................................................128 kbytes

• Average Access Time ........................................................................Random Access Time : 75 ms Typical

4) POWER REQUIREMENTS

• Voltage ......................................................................................................................................+5V DC +5%

+12V DC +

• Ripple ..................................................................................................................+5V : Less than 100mVp-p

+12V : Less than 100mVp-p

• Current .......................................................................................................................+5V : 0.9A (Maximum)

+12V : 1.5A (Maximum)

5) AUDIO PERFORMANCE

• Frequency Response.....................................................................................................20Hz~20KHz(+3dB)

• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................75 dB (Typical at 1 KHz 0dB)

70 dB (Limit at 1 KHz 0dB)

• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)

0.15% (Limit at 1 KHz 0dB)

• Channel Separation (IHF-A+20 KHz LPF) .............................................................................75 dB (Typical)

70 dB (Limit)

• Output Level (1kHz 0dB) 47KΩ Load ..................................................................................0.75Vrms +

10%

• Headphone Level (1kHz 0dB) 33Ω Load...............................................................................0.7Vrms +

20%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight CD-ROM Drive

•

Max 7,200KB/sec Sustained Transfer rate (GCR-8480B)

• Max 7,800KB/sec Sustained Transfer rate (GCR-8520B)

• Photo-CD Multisession Disc Spec compliant

• Multimedia MPC-3 Spec compliant

• Power Tray Loading/Ejection Mechanism

• 3 Way Eject support

(Software, O/C Button, Emergency Eject)

• Closed Enclosure

• Built-in ATAPI Interface Controller

• Software Volume Control

• 8 Times Digital Filter for CD Audio

• Built-in MODE-1 ECC/EDC

• MTBF 125,000h POH (at 10% Utilization)

• PIO Mode 4 & Multi DMA Mode 2 support

• Horizontal or Vertical Mounting

• Digital audio output connector

• Digital audio through ATAPI Interface

• Subcode (P-W) through ATAPI Interface

• Spin-down Mode for energy saving

• MS-DOS Version 3.1 or Higher

• Windows '95/'98/’2000/Me/XP

• Solaris Ver 2.4 or Higher

• Linux slackware Ver 2.3

• Windows NT 4.0 or later

• OS/2 Warp (Ver 3.0)

This service manual provides a variety of service

information. It contains the mechanical structure of

the CD-ROM Drive together with mechanical

adjustments and the electronic circuits in schematic

form. This CD-ROM Drive was manufactured and

assembled under our strict quality control standards

and meets or exceeds industry specifications and

standards.

2. MODEL: GCR-8520B

1) SUPPORTED SYSTEM

• IBM Compatible 486SX or Above (With PIO mode 4 recommended)

2) SUPPORTED OS

3) GENERAL PERFORMANCE

• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate

22Times Speed (Inner side) : 3,300 kbytes/sec

52 Times Speed (max., Outer side) : 7,800 kbytes/sec

• Data Buffer Capacity.....................................................................................................................128 kbytes

• Access Time......................................................................Random Access Time(Max 52x) : 80 ms Typical

4) POWER REQUIREMENTS

• Voltage ......................................................................................................................................+5V DC +5%

+12V DC +5%

• Ripple ..................................................................................................................+5V : Less than 100mVp-p

+12V : Less than 100mVp-p

• Current .......................................................................................................................+5V : 0.9A (Maximum)

+12V : 1.5A (Maximum)

5) AUDIO PERFORMANCE

• Frequency Response.....................................................................................................20Hz~20KHz(+

3dB)

• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................75 dB (Typical at 1 KHz 0dB)

70 dB (Limit at 1 KHz 0dB)

• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)

0.15% (Limit at 1 KHz 0dB)

• Channel Separation (IHF-A+20 KHz LPF) .............................................................................75 dB (Typical)

70 dB (Limit)

• Output Level (1kHz 0dB) 47KΩ Load ..................................................................................0.75Vrms +

10%

• Headphone Level (1kHz 0dB) 33Ω Load...............................................................................0.7Vrms + 20%

• MS-DOS Version 3.1 or Higher

• Windows '95/'98/’2000/Me/XP

• Solaris Ver 2.4 or Higher

• Linux slackware Ver 2.3

• Windows NT 4.0 or later

• OS/2 Warp (Ver 3.0)

2. Trouble List (Circuit)

A. LED doesn’t light.

B. Pick-Up doesn’t move to the inner-track.

C. The Laser of Pick-Up doesn’t light.

D. Pick-Up lens doesn’t move up and down.

E. Disc doesn’t rotate.

F. TOC isn’t read. (The LED turns on, but doesn’t flicker.)

G. During Audio CD Play, LED flickers, but Speaker is silent.

TROUBLESHOOTING GUIDE

1. Initial Lead-in Operation

Reset or Power-On.

LED Flickers.

Pick-Up moves to the inner-Track.

Laser on the Pick-Up lights.

Focus Search (through moving up and down the lens of Pick-Up)

Focus Servo On (FEO(TP15) signal generation)

Rotate disc.

Tracking Servo On (TEO(TP14) Signal generation)

Spindle Servo On (SPO(TP25) Signal generation)

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

3. Troubleshooting Guide

A. LED doesn’t light.

Check Power Voltage (TP1:3.3V, TP2:12V)

Reference Voltage

[TP3:VC(2.5V) and GND.]

Does “H” output in IC501 pin ?

Check and replace R105, R106, Q12

and LED701 (LED702 for NECCI).

Is the CLOCK Frequency of

IC501 pin ,

33.86MHz?

Check the power input

pattern.

Check IC501.

Check and replace X10;

33.86MHz.

Is the CLOCK Frequency of IC501 pin

33.86MHz?

Check and replace IC501.

YES

170

A-1

B. Pick-Up doesn’t move to the inner track.

Do the signals appear at IC501

pin , ?

(Refer to Fig. B-1.)

Do the signals appear in PN301

pin?

(Refer to Fig. B-2.)

Does “H” output at IC201

pin ?

Is the 2.5V at IC201 pin ?

Check the pattern from

IC501 pin to IC201

Check IC501.

Replace IC102.

Check the PN301, and then

replace the Sled Motor.

YES

Replace IC201.

107

CH1

PIN34

DA0

CH2

PIN35

DA1

CH1 TP4

(/A)

(A)

(/B)

(B)

CH2 TP5

CH3 TP6

CH4 TP7

Fig. B-1. DA0 and DA1 Signals

Fig. B-2. TP4, TP5, TP6 and TP7 Signals

Check the pattern from

IC501 pin to R42

and then replace IC501.

Does “Low” output at IC102

pin ?

Is the voltage of IC102 pin

(LDD) 2V?

Check Pick-Up FFC, PN101.

Check Q10, C10, C32,

R113, R114 and then

replace IC102.

Replace IC501.

YES

157

Does the focus search signal

appear at FDO (TP9)?

(Refer to Fig. D-1.)

Is the 2.5V at IC201 pin ?

Replace IC102.

YES

Replace IC201.

Does the focus search signal

appear between F+ (TP10)

and F- (TP11)?

(Refer to Fig. D-2.)

C. The Laser of Pick-Up doesn’t light.

D. The Pick-UP lens doesn’t move up and down.

D-1

Check the pattern from

pin , of IC201 to

pin , of PN101.

Check the PN101, Pick-Up

FFC.

Replace the Pick-Up.

Replace PN101 or Pick-Up

FFC.

CH1

TP9

(FDO)

CH1

TP10(F+)

TP11(F-)

Fig. D-1. FDO Signal

Fig. D-2. Focus Search Signal

D-1

Does the signal appear at

the SP0 (TP25)?

(Refer to Fig. E-3.)

Do the signals appear at

IC201 pin (W), (V),

and (U)?

Replace IC501.

Replace IC201.

YES

Check the pattern from

IC201 pin , , to

PN201 , , .

YES

Check Spindle Motor FFC

and then replace the

Spindle Motor.

Does the signal appear at

FEO (TP15) when the

IC501 pin opened?

(Refer to Fig. E-1.)

YES

Replace IC501.

Replace Pick-Up.

Do the signal appear at

TP15 (FEO)?

(Refer to Fig. E-2.)

Does the signal appear at

(TP10) during focus

search?

E. Disc doesn’t rotate.

144

Fig. E-2. FEO Signal

CH1

TP15:

FEO

Fig. E-3. SPO Signal

CH1

TP25:

SPO

Fig. E-1. S-Curve

CH1

TP15:

S-Curve

Is the Focus Servo ON?

(Does FEO (TP15) signal

appear?)

Does A, B, C, D signal

appear at IC102 pin ,

YES

Is the Tracking Servo ON?

(Does TEO (TP14) signal

appear?)

Does E, F signal appear

at IC102 pin , ?

YES

Is TOC area on the disc

read? (Does LED flicker?)

Does the other disc

operate normally?

Normal Disc is defective.

YES YES

Does RFI signal appear?

Is Spindle Servo ON?

(Does SP0 signal (TP25)

appear?)

YES YES

Does RFIN signal appear

at IC102 pin ?

Replace IC102.

Replace IC501.

Replace Main Circuit

Board or MD Ass’y.

Refer to C.

(The Laser of Pick-Up

doesn’t light.)

F. TOC isn’t read.

Does Audio signal appear

at IC501 pin , ?

(Refer to Fig. G-1.)

YES

87 90

Replace IC501.

Does “H” signal appear at

IC501 pin ?

YES

113

Check the IC501 pin

and then replace IC501?

113

Check C87.

YES

Are L-ch, R-ch signals

appear at JK701 and

Audio Line out connector

each?

Check JK701 and

L701,L703.

Does Audio signal appear

at IC602 pin , ?

1 7

Is the voltage of IC602

pin 2.5V?

Replace IC602.

G. During Audio CD play, LED flickers, but Speaker is silent.

G-1

Is the connection

between JK801 (or Audio

Line out connector) and

Line (or Jack) normal?

Check the JK801 and

Audio line pattern.

YES

Check your sound card,

Audio Cable, Speaker,

Volume and Headphone

Jack.

Fig. G-1. Audio Signal

CH1

PIN87 of

IC501

CH2

PIN90 of

IC501

G-1

1. CABINET and CIRCUIT BOARD

DISASSEMBLY

1-1. Bottom Chassis

A. Release 4 screws (A) and remove the Bottom

Chassis in the direction of arrow (1). (See Fig. 1-1)

1-2. Front Bezel Assy

A. Insert and Press a rod in the Emergency Eject

Hole and then the CD Tray will open in the

direction of arrow (2).

B. Remove the Tray Door in the direction of arrow (3)

by pushing it outward.

C. Release 3 stoppers and remove the Front Bezel

Assy.

1-3. Cabinet and Main Circuit Board

A. Remove the Cabinet in the direction of arrow (4).

(See Fig. 1-3)

B. Release 2 hooks (a) and remove the CD Tray.

C. Remove the Soldering of the LD- and LD+ (B) for

the Loading Motor, and then remove the Main

Circuit Board.

D. At this time, be careful not to damage the 3

connectors of the Main Circuit Board.

2. MECHANISM ASSY

A. Separate the Pick-Up Unit from the Mechanism

Assy.

B. Release 1 screws (C) and then remove the Pick-

Up ( ).

DISASSEMBLY

(A)

(1)

Bottom Chassis

(3)

(2)

Tray Door

Stoppers

CD Tray

Emergency Eject Hole

Front Bezel Assy

(4)

Cabinet

Main

Circuit Board

(B)

Hooks (a)

Mechanism Assy

Pick-up Unit

(C)

Fig. 1-1

Fig. 1-2

Fig. 1-3

Fig. 1-4

PHOTO DIODE STRUCTURE OF THE PICK-UP

(1) Focus Error Signal –> (A+C)-(B+D)

(Control the Pick-up’s up and down to focus on the Disc)

(2) Tracking Error Signal –> (E-F)

(Control the Pick-up’s left and right shift to find the track on the Disc)

(3) RF Signal –> (A+B+C+D)

(

RF Signal is converted to Data Signal in One Chip IC (IC501))

Three signals (Focus Error Signal, Tracking Error Signal and RF Signal) above are I-V converted and

amplified at the IC102, and then are transmitted to One Chip IC (IC501) to generate the Servo Control

Signal and Data Signal.

Red laser

Pick-Up module

Tracking

Focusing

REF

REFREF

REF

VCC

APC

EQ-CONTROL

PH-CONTROL

7_MODE

39K

33K

7_MODE

100K

BHC

PHC

RFAO

GND1

RFA-

RFIN

FIN1

VCC1

RFSM

RHLD

GND2

REFL

FE-

TE-

TSS

VCC2

TSH

FBAL

TBAL

SGC

100K

FIN2

56K

VCC

56K

REFI

VREF

LDD

LDS

LDON

GHS

BHH

EQS

IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION

• IC102 (LA9246T) : RF Amplifier IC

I-V converts and amplifies the signal received from the pick-up and then applies to DSP part of one-

chip IC (IC501).

Block Diagram

Pin No. Pin Name Descriptions

1 BHC Bottom hold external condensor pin for checking RFAGC.

2 PHC Peak hold external condensor pin for checking RFAGC.

3 RFAO RF Pre AMP output

4 GND RF GND

5 RFA- RF Pre AMP (-) input

6 RFIN RF Sum input

7 FIN1 Pickup output (B+D),

8 Fin2 Pickup output (A+C),

9 E Pickup output (E)

10 F Pickup output (F)

11 REFI Eeternal Condensor Pin of Reference Voltage.

12 VREF Reference output

13 LDD APC circuit output

14 LDS APC circuit input

15 LDON Laser on/off.

16 GHS RF signal gain control.

17 BHH BH response control.

18 EQS RF equalizer. PH detection control

19 SGC Servo gain control

20 TBAL TE balance adjust

21 FBAL FE balance adjust

22 TSH TS wide band control

23 VCC2 Servo VCC

24 TS TS output

25 TSS TS wide band control

26 TE TE signal output (To DSP)

27 TE- TE gain control

28 FE FE signal output (To DSP)

29 FE- FE gain control

30 REFL Reflection output (To DSP)

31 GND2 Servo GND

32 RHLD RF hold control

33 RFSM EFM signal output (To DSP)

34 VCC1 RF VCC

35 BH RF bottom hold output (To DSP)

36 PH RF peak hold output (To DSP)

Pin Description

• IC201 (M63026FP) : Drive IC (Spindle/Servo Actuator)

Rotates the Spindle Motor by receiving MDP signal from IC501.

Generates the signal to drive Focus Actuator Coil, Tracking Actuator Coil, Sled Motor, and Stepping

Motor by Control Signal input from DSP and u-COM.

Block Diagram

HU+

HU-

HV+

HV-

HW+

HW-

SPIN

REF

SL1IN

SL2IN

FOIN

TOIN

023/024

026/027

X12

TO+

TO-

FO+

FO-

GND

LO+

LO-

VM3

LOIN+

5Vcc

OSC

MU1

MU2

VM1

RSP

RSL1

RSL2

SL1+

SL1-

SL2+

SL2-

VM2

023/026 FG x1

024/027 FG x3

Reverse

Detect

120˚

MATRIX

Hall Bias

CTL

amp

Direction

comp

Direction

comp

Direction

comp

Current

comp

Current

comp

Current

comp

CTL

amp

CTL

amp

Logic

TSD

BIAS

Brake select

Frequency

generator

VM1

Regulator

Reg

5V power supply

023/024

026/027

X12

Pin Description

Pin No.

Symbol Description

Pin No.

Symbol Description

1 SL1IN Slide control voltage input 1

2 SL2IN Slide control voltage input 2

3 VM2 Motor Power Supply 2 (for Slide)

4 RSL2 Slide current sense 2

5 SL2+ Slide non-inverted output 2

6 SL2- Slide inverted output 2

7 GND GND

8 RSL1 Slide current sense 1

9 SL1+ Slide non-inverted output 1

10 SL1- Slide inverted output 1

11 GND GND

12 W Motor drive output W

13 V Motor drive output V

14 U Motor drive output U

15 RSP Spindle current sensie

16 HW- HW- sensor amp. input

17 HW+ HW+ sensor amp. input

18 HV- HV- sensor amp. input

19 HV+ HV+ sensor amp. input

20 HU- HU- sensor amp. input

21 HU+ HU+ sensor amp. input

22 VM1 Motor Power Supply 1 (for Spindle)

23 HB Bias for Hall Sensor

24 FG Frequency generator output

25 REF Refernce voltage input

26 SPIN Spindle control voltage input

27 FOIN Focus control voltage input

28 TOIN Tracking control voltage input

29 GND GND

30 TO- Tracking inverted output

31 TO+ Tracking non-inverted output

32 5VCC 5V Power Supply (for FS, TS)

33 GND GND

34 FO+ Focus non-inverted output

35 FO- Focus inverted output

36 LO+ Loading non-inverted output

37 LO- Loading inverted output

38 MU2 Mute/break select terminal 2

39 VM3 Power supply 3(for Loading)

40 LOIN+ Loading control input( + )

41 MU1 Mute/break select terminal 1

42 OSC PWM carrier oscilation set

Driver

VCEC

PLL

TDO, FDO

SLDO, SPDO

*11

*12

*14

LA9238

CD-DSP

Data bus[0.7]

DRAM

Data bus[0.15]

LC895300

LC895299

Adress bus[0.18]

Sub-code I/F

de-interleve

Adress generator

Sub-code ECC

Address generator

ATAPI I/F

Data output input I/F

Microcontroller

RAM access

De-scramble &

Buffering

ECC & EDC

SRAM

CD-DSP I/F

& SYNC

Detector

Merge

EXT10

CMDI

Each Block

FGCNT

Audio

Circuit

ZRESET

HOST

decoder

*10

*13

XTALCK

Each Block

XTAL

Micro

controller

1.5K

RAM

Clock

generator

Buffer

DRAM

Bus

Arbiter

DRAM

controller

Each Block

Bus control

siganl

128K

EEPROM

A0~A16

D0~D7

ZOE, ZWE, ZCE

Gray Block si characteristic of LG895300.

Interrupt

Controller

Timer

FGCNT CMDI

EXTII

SW1

SW2

SW3

IOPORT

0~14

• IC501 (HMS895300) : DSP+ATAPI DECODER+DRAM + µ-COM

Block Diagram

*1 EFMIN,EFMIN2,PH,BH,FE,TE,TES,RREC

*2 RHLD,TSH,EQS,GHS,LDON,FBAL,TBAL,TOFST,SGC

*3 LOUT,ROUT,DOUT

*4 DD~DD15,ZDASP,ZPDIAG

*5 ZCSIFX,ZCS3FX,DA0~2,ZDIOR,ZDIOW,ZDMACK,ZHRST,CSEL

*6 DMARQ,HINTRQ,ZIOCS16,IORDY

*7 ZRD,ZWR,ZCS,MCK,SUA0~7

*8 D0~7

*9 CRCERR/FLOCK,HFLO/WRQ/DIR/TLOCK,FSEQ,FSX/LRCK/FV,EFLG/ CK2/PRF,C2F/PCK,EFMOUT

*10 TEST0~2

*11 PCKISTF,PCKIFTP,PDO,POS1~3,RF

*12 SLCO0~3,JITC,DSLB,PHC,BHC

*13 PLL1

*14 SLCIT1~2,AD1,VREF,CSS

• IC501 HMS895300

Pin Description

Pin No. Signal Type COMMENT

1 Vss P Logic GND

2 A11 O PROM ADDRESS

3A9 O

4A8 O

5 A13 O

6 A14 O

7 Wstrobe O Write Strobe

8 A16 O 128K

9 A15 O 64K

10 A12 O

11 A7 O

12 A6 O

13 A5 O

14 A4 O

15 A3 O

16 A2 O

17 A1 O

18 A0 O

19 DATA0 B PROM DATA

20 DATA1 B

21 VDDD P DRAM VDD 5V

22 VDD1 P 3.3V

23 Vss P Logic GND

24 VSSD P DRAM GND

25 DATA2 B PROM DATA

26 DATA3 B

27 DATA4 B

28 DATA5 B

29 DATA6 B

30 DATA7 B

31 ZCE O Chip Enable Signal

32 A10 O PROM ADDRESS

33 Psen O Access Enable Signal

34 IOPORT0 B General Input/Output Port

35 IOPORT1 B

36 IOPORT2 B

TYPE

I:INPUT B:BIDIRECTION NC:NOT CONNECT O:OUTPUT P:POWER

Pin No. Siganl Type COMMENT

37 TEST0 I TEST PIN (GND)

38 WRQ/HFLO/DIR/TLOCK O Monitor Pin

39 FSEQ/DEF O Frame Sync/DEFECT

40 DOUT/TESO O Digital OUT

41 VDD0 P I/O 5V power supply

42 VSS P Logic GND

43 PLL1 O System Clock PLL

44 PLL1VDD P Logic PLL VDD 3.3V

45 PLL1VSS

P logic PLL GND

46 CSEL I ATAPI I/F

47 ZHRST I

48 ZDASP B

49 ZCS3FX I

50 ZCS1FX I

51 Vss1 P I/F GND

52 VDD0 P I/O 5V power supply.

53 DA2 I ATAPI I/F

54 DA0 I

55 ZPDIAG B

56 DA1 I

57 ZIOCS16 O

58 Vss1 P I/F GND

59 HINTRQ O ATAPI I/F

60 ZDMACK I

61 IORDY O

62 ZDIOR I

63 ZDIOW I

64 DMARQ O

65 VDD0 P I/O 5V power supply.

66 VDD1 P 3.3V

67 Vss1 P I/F GND

68 DD15 B ATAPI I/F

69 DD0 B

70 DD14 B

72 DD13 B

73 DD2 B

74 DD12 B

75 DD3 B

76 Vss

1 P I/F GND

Page is loading ...

Hitachi GCR-8520B User manual

Brand: Hitachi

Model: GCR-8520B

Type: User manual

This manual is also suitable for

GCR-8480B

Download PDF

report

Hitachi GCR-8520B User manual

This manual is also suitable for

Hitachi GCR-8520B User manual

Related papers

Other documents