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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
• 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
1. MODEL: GCR-8480B
1) SUPPORTED SYSTEM
• IBM Compatible 486SX or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/'2000/Me/XP
3) GENERAL PERFORMANCE
• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate
• Data Buffer Capacity.....................................................................................................................128 kbytes
• Average Access Time ........................................................................Random Access Time : 75 ms Typical
4) POWER REQUIREMENTS
• Voltage ......................................................................................................................................+5V DC +5%
• Ripple ..................................................................................................................+5V : Less than 100mVp-p
• Current .......................................................................................................................+5V : 0.9A (Maximum)
5) AUDIO PERFORMANCE
• Frequency Response.....................................................................................................20Hz~20KHz(+3dB)
• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................75 dB (Typical at 1 KHz 0dB)
• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)
• Channel Separation (IHF-A+20 KHz LPF) .............................................................................75 dB (Typical)
• Output Level (1kHz 0dB) 47KΩ Load ..................................................................................0.75Vrms + 10%
• Headphone Level (1kHz 0dB) 33Ω Load...............................................................................0.7Vrms + 20%
INTRODUCTION
GENERAL FEATURE

SPECIFICATIONS

• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
form. This CD-ROM Drive was manufactured and
assembled under our strict quality control standards
and meets or exceeds industry specifications and
standards.
• 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
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
22Times Speed (Inner side) : 3,300 kbytes/sec
48 Times Speed (max., Outer side) : 7,200 kbytes/sec
+12V DC +5%
+12V : Less than 100mVp-p
+12V : 1.5A (Maximum)
70 dB (Limit at 1 KHz 0dB)
0.15% (Limit at 1 KHz 0dB)
70 dB (Limit)
3

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   Summary of Contents for Hitachi GCR-8480B

  • Page 1: Specifications

    • Software Volume Control • Internal 5.25 inch, halfheight CD-ROM Drive • 8 Times Digital Filter for CD Audio • Max 7,200KB/sec Sustained Transfer rate (GCR-8480B) • Built-in MODE-1 ECC/EDC • Max 7,800KB/sec Sustained Transfer rate (GCR-8520B) • MTBF 125,000h POH (at 10% Utilization) •...

  • Page 2

    2. MODEL: GCR-8520B 1) SUPPORTED SYSTEM • IBM Compatible 486SX or Above (With PIO mode 4 recommended) 2) SUPPORTED OS • MS-DOS Version 3.1 or Higher • Solaris Ver 2.4 or Higher • Windows NT 4.0 or later • Windows '95/'98/’2000/Me/XP •...

  • Page 3: Troubleshooting Guide

    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) Rotate disc. Focus Servo On (FEO(TP15) signal generation) Tracking Servo On (TEO(TP14) Signal generation) Spindle Servo On (SPO(TP25) Signal generation) Read TOC Area (LED Flickers)

  • Page 4

    3. Troubleshooting Guide A. LED doesn’t light. Check Power Voltage (TP1:3.3V, TP2:12V) Check the power input Reference Voltage pattern. [TP3:VC(2.5V) and GND.] Is the CLOCK Frequency of IC501 pin Does “H” output in IC501 pin 33.86MHz? Check and replace R105, R106, Q12 Check IC501.

  • Page 5

    B. Pick-Up doesn’t move to the inner track. Do the signals appear at IC501 Check IC501. (Refer to Fig. B-1.) Check the pattern from Does “H” output at IC201 IC501 pin to IC201 Is the 2.5V at IC201 pin Replace IC102. Do the signals appear in PN301 pin? Replace IC201.

  • Page 6

    C. The Laser of Pick-Up doesn’t light. Does “Low” output at IC102 Replace IC501. Check Q10, C10, C32, Is the voltage of IC102 pin R113, R114 and then (LDD) 2V? replace IC102. Check Pick-Up FFC, PN101. D. The Pick-UP lens doesn’t move up and down. Check the pattern from Does the focus search signal IC501 pin...

  • Page 7

    Check the pattern from of IC201 to of PN101. Replace PN101 or Pick-Up Check the PN101, Pick-Up FFC. FFC. Replace the Pick-Up. TP10(F+) TP11(F-) (FDO) Fig. D-1. FDO Signal Fig. D-2. Focus Search Signal...

  • Page 8

    E. Disc doesn’t rotate. Does the signal appear at Does the signal appear at FEO (TP15) when the Replace Pick-Up. F + (TP10) during focus IC501 pin opened? search? (Refer to Fig. E-1.) Replace IC501. Do the signal appear at Replace IC501.

  • Page 9

    TP15: TP15: S-Curve Fig. E-1. S-Curve Fig. E-2. FEO Signal TP25: Fig. E-3. SPO Signal...

  • Page 10

    F. TOC isn’t read. Is the Focus Servo ON? Does A, B, C, D signal (Does FEO (TP15) signal appear at IC102 pin appear?) Replace IC102. Refer to C. (The Laser of Pick-Up Is the Tracking Servo ON? Does E, F signal appear doesn’t light.) (Does TEO (TP14) signal at IC102 pin...

  • Page 11

    G. During Audio CD play, LED flickers, but Speaker is silent. Does Audio signal appear Replace IC501. at IC501 pin (Refer to Fig. G-1.) Does “H” signal appear at Check the IC501 pin and then replace IC501? IC501 pin Does Audio signal appear Is the voltage of IC602 Replace IC602.

  • Page 12

    Is the connection between JK801 (or Audio Check the JK801 and Line out connector) and Audio line pattern. Line (or Jack) normal? Check your sound card, Audio Cable, Speaker, Volume and Headphone Jack. PIN87 of IC501 PIN90 of IC501 Fig. G-1. Audio Signal...

  • Page 13

    DISASSEMBLY 1. CABINET and CIRCUIT BOARD 1-3. Cabinet and Main Circuit Board A. Remove the Cabinet in the direction of arrow (4). DISASSEMBLY (See Fig. 1-3) 1-1. Bottom Chassis B. Release 2 hooks (a) and remove the CD Tray. A. Release 4 screws (A) and remove the Bottom C.

  • Page 14

    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 –>...

  • Page 15

    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 PH-CONTROL EQ-CONTROL 7_MODE VCC1 RFAO RFSM...

  • Page 16

    Pin Description Pin No. Pin Name Descriptions Bottom hold external condensor pin for checking RFAGC. Peak hold external condensor pin for checking RFAGC. RFAO RF Pre AMP output RF GND RFA- RF Pre AMP (-) input RFIN RF Sum input FIN1 Pickup output (B+D), Fin2...

  • Page 17

    • 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 023/026 FG x1 024/027 FG x3...

  • Page 18

    • IC501 (HMS895300) : DSP+ATAPI DECODER+DRAM + µ-COM Block Diagram Driver TDO, FDO LC895300 SLDO, SPDO LC895299 DRAM VCEC Data bus[0.7] Data bus[0.15] Adress bus[0.18] Sub-code I/F LA9238 de-interleve Adress generator CD-DSP Each Block Bus control siganl SRAM Audio Sub-code ECC Circuit Address generator Arbiter...

  • Page 19

    • IC501 HMS895300 TYPE Pin Description I:INPUT B:BIDIRECTION NC:NOT CONNECT O:OUTPUT P:POWER Pin No. Signal Type COMMENT Logic GND PROM ADDRESS Wstrobe Write Strobe 128K DATA0 PROM DATA DATA1 DRAM VDD 5V 3.3V DD 1 Logic GND DRAM GND DATA2 PROM DATA DATA3 DATA4...

  • Page 20

    Pin No. Siganl Type COMMENT TEST0 TEST PIN (GND) WRQ/HFLO/DIR/TLOCK Monitor Pin FSEQ/DEF Frame Sync/DEFECT DOUT/TESO Digital OUT I/O 5V power supply Logic GND PLL1 System Clock PLL PLL1V Logic PLL VDD 3.3V PLL1V logic PLL GND CSEL ATAPI I/F ZHRST ZDASP ZCS3FX...

  • Page 21

    Pin No. Siganl Type COMMENT DD11 ATAPI I/F DD10 I/O power supply 5V DD 0 TEST1 TEST Pin (GND) ROUT DAC output DAC VDD 5V AUVss DAC GND LOUT DAC output Logic GND XTALCK XTALCK input XTAL XTALCK output I/O power supply 5V DD 0 FSX/LRCK Monitor port...

  • Page 22

    Pin No. Siganl Type COMMENT IOPORT9 General input/output port DSLB SLC PWM output Slice Level VDD 3.3V SLCIST1 EFM Slice Level Control port SLCIST2 SLCO0 EFM Slice level output SLCO1 SLCO2 SLCO3 EFMIN EFM input pin EFMIN2 AVss Slice Level GND JITC Jitter output PWM0...

  • Page 23

    Pin No. Siganl Type COMMENT Servo VDD 5V SVss Servo GND Tracking output Focus output SLDO Sled output SPDO Spindle output A/D & D/A 5V DD 0 Logic GND 3.3V DD 1 RHLD RFAGC hold output port TS select port RF Equalizer select port RF signnal , TS signal gain LDON...

  • Page 24

    BLOCK DIAGRAM LA9246T RF Amp. 33.86MHz Optical Disc Pick-up Motor unit HMS895300 I/F Cable DSP+Decoder+DRAM +System controller SPINDLE FOCUS TRACKING SLED LOADING MOTOR COIL COIL MOTOR MOTOR M63026FP R-ch MOTOR DRIVE FLASH L-ch MEMORY Line-out 3.3V Reg. +3.3V +12V +12V...

  • Page 25

    EXPLODED VIEW PBM00 (MAIN C.B.A) PBF00 (FRONT C.B.A)

This manual also for:

Gcr-8520b

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