Hitachi GCR-8480B User Manual Download Page 16

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Pin No.

Pin Name

Descriptions

BHC

Bottom hold external condensor pin for checking RFAGC.

PHC

Peak hold external condensor pin for checking RFAGC.

RFAO

RF Pre AMP output

GND

RF GND

RFA-

RF Pre AMP (-) input

RFIN

RF Sum input

FIN1

Pickup output (B+D),

Fin2

Pickup output (A+C),

Pickup output (E)

Pickup output (F)

REFI

Eeternal Condensor Pin of Reference Voltage.

VREF

Reference output

LDD

APC circuit output

LDS

APC circuit input

LDON

Laser on/off.

GHS

RF signal gain control.

BHH

BH response control.

EQS

RF equalizer. PH detection control

SGC

Servo gain control

TBAL

TE balance adjust

FBAL

FE balance adjust

TSH

TS wide band control

VCC2

Servo VCC

TS output

TSS

TS wide band control

TE signal output (To DSP)

TE-

TE gain control

FE signal output (To DSP)

FE-

FE gain control

REFL

Reflection output (To DSP)

GND2

Servo GND

RHLD

RF hold control

RFSM

EFM signal output (To DSP)

VCC1

RF VCC

RF bottom hold output (To DSP)

RF peak hold output (To DSP)

Pin Description

Summary of Contents for GCR-8480B

Page 1: ...OM 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 M...

Page 2: ...C 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 7...

Page 3: ...lay LED flickers but Speaker is silent 22 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...

Page 4: ... 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 OK NG YES YES NO NO NO 170 93 94 54 A 1 A 1 ...

Page 5: ...output at IC201 pin Is the 2 5V at IC201 pin Check the pattern from IC501 pin to IC201 pin Check IC501 Replace IC102 Check the PN301 and then replace the Sled Motor YES YES YES YES NO NO Replace IC201 NO NO 34 41 25 35 107 41 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 ...

Page 6: ...113 R114 and then replace IC102 Replace IC501 YES YES NO NO 13 157 15 Does the focus search signal appear at FDO TP9 Refer to Fig D 1 Is the 2 5V at IC201 pin Replace IC102 YES YES YES NO NO Replace IC201 NO 25 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 ...

Page 7: ...ttern from pin of IC201 to pin of PN101 Check the PN101 Pick Up FFC Replace the Pick Up Replace PN101 or Pick Up FFC OK OK NG 34 35 1 4 CH1 TP9 FDO CH1 TP10 F TP11 F Fig D 1 FDO Signal Fig D 2 Focus Search Signal D 1 ...

Page 8: ... IC201 pin to PN201 YES OK 12 13 14 13 12 11 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 YES YES NO NO Replace IC501 Replace IC501 Replace Pick Up NO Do the signal appear at TP15 FEO Refer to Fig E 2 Does the signal appear at F TP10 during focus search E Disc doesn t rotate 144 ...

Page 9: ...28 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 ...

Page 10: ...O 9 YES Is TOC area on the disc read Does LED flicker Does the other disc operate normally Normal Disc is defective YES YES NO 10 NO Does RFI signal appear Is Spindle Servo ON Does SP0 signal TP25 appear YES YES NO NO NO Does RFIN signal appear at IC102 pin 6 Replace IC102 Replace IC102 Replace IC501 Replace Main Circuit Board or MD Ass y NO Refer to C The Laser of Pick Up doesn t light F TOC isn ...

Page 11: ...3 Check the IC501 pin and then replace IC501 113 Check C87 YES YES YES Are L ch R ch signals appear at JK701 and Audio Line out connector each NO Check JK701 and L701 L703 Does Audio signal appear at IC602 pin NO 1 7 Is the voltage of IC602 pin 2 5V 6 NO Replace IC602 G During Audio CD play LED flickers but Speaker is silent G 1 ...

Page 12: ...801 or Audio Line out connector and Line or Jack normal NO 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 ...

Page 13: ... 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 t...

Page 14: ... 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 B C E F D A ...

Page 15: ...4 VCC1 33 RFSM 32 RHLD 31 GND2 30 REFL 29 FE 28 FE 27 TE 26 TE 25 TSS 24 TS 23 VCC2 22 TSH 21 FBAL 20 TBAL 19 SGC 100K 8 FIN2 56K 9 E F VCC 56K 10 11 12 REFI VREF 13 LDD 14 LDS 15 LDON 16 GHS 17 BHH 18 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 Bloc...

Page 16: ...t 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 F...

Page 17: ... 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 sen...

Page 18: ...ler 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 FGCNTCMDI EXTII SW1 SW2 SW3 IOPORT 0 14 FG 16 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...

Page 19: ...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 CON...

Page 20: ... 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 ...

Page 21: ...tput 94 VDD0 P I O power supply 5V 95 FSX LRCK O Monitor port 96 EFLG CK2 O 97 TRV2 DATA B General input output port 98 TRV B 99 FLOCK CRCERR O FLOCK CRCERR C2F PCK output C2F PCK 100 EFMOUT O EFM output 101 OUTPORT O General output port 102 SW1 I Tray Close 103 SW2 I Tray open 104 SW3 I Eject Switch 105 IOPORT3 B General input output port 106 IOPORT4 B 107 IOPORT5 B 108 IOPORT6 B 109 VSSD P DRAM ...

Page 22: ...131 PCKISTP I Phase comparater charge pump control port 132 PLL2VDD P VCEC PLL VDD 3 3V 133 PLL2Vss P VCEC PLL GND 134 PDO O Charge Pump Filter 135 PDS1 O Charge Pump select port 136 PDS2 O 137 PDS3 O 138 RPO O P N Balance Adjust port 139 SVss P Servo GND 140 AD1 I AD input1 141 PH I Peak HOLD 142 BH I Bottom HOLD 143 RREC I Optical judge input port 144 FE I FE input port 145 TE I TE input port 14...

Page 23: ... 162 VDD1 P 3 3V 163 RHLD O RFAGC hold output port 164 TSH O TS select port 165 EQS O RF Equalizer select port 166 GHS O RF signnal TS signal gain 167 LDON O Laser Control port 168 TEST2 I TEST PIN GND 169 FG I FG input 170 IOPORT10 B General Input output port 171 IOPORT11 B 172 IOPORT12 B 173 IOPORT13 Debug1 B Audio Mute 174 IOPORT14 Debug2 B LED Drive port 175 ZRESET I CHIP RESET 176 VDD0 P I O ...

Page 24: ...95300 FLASH MEMORY RF Amp DSP Decoder DRAM System controller SPINDLE MOTOR FOCUS COIL SLED MOTOR LOADING MOTOR 33 86MHz I F Cable R ch L ch Line out H O S T TRACKING COIL Disc Motor unit Optical Pick up MOTOR DRIVE GND GND 12V 5V GND GND 12V 32 BLOCK DIAGRAM ...

Page 25: ...03 030 020 A02 A01 020 051 028 050 029 434 021 434 434 413 413 413 001 413 430 028 027 026 025 033 435 010 009 008 011 012 005 034 014 013 434 031 016 015 004 006 431 A B C D E F G H 1 2 3 4 5 PBF00 FRONT C B A EXPLODED VIEW 7 8 ...

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