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LG CRD-8480M Service Manual

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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
• Fast 75ms Average Access Time
• Max 7,200KB/sec Sustained Transfer rate
• 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. SUPPORTED SYSTEM
• IBM Compatible 486SX or Above (With PIO mode 4 recommended)
2. SUPPORTED OS
• MS-DOS Version 3.1 or Higher
• OS/2 Warp (Ver 3.0)
• Windows '95/'98
3. GENERAL PERFORMANCE
• Data Transfer Rate..........................................................................................Sustained Data Transfer Rate
• Data Buffer Capacity .....................................................................................................................128 kbytes
• Access Time ...................................................................................................Random Access Time : 75 ms
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)........................................................................85 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)..............................................................................80 dB (Typical)
• Output Voltage (1kHz 0dB) 47KΩ Load .................................................................................0.7Vrms + 10%
• Headphone Level (1kHz 0dB) 33Ω Load ...............................................................................0.7Vrms + 20%
INTRODUCTION
GENERAL FEATURE

SPECIFICATIONS

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
• Front panel Volume Control for Headphone Output
• 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
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
20Times Speed (Inner side) : 3,000 kbytes/sec
48 Times Speed (max., Outer side) : 7,200 kbytes/sec
+12V DC + 5%
+12V : Less than 100mVp-p
+12V : 1.5A (Maximum)
80 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 LG CRD-8480M

  • Page 1: Specifications

    INTRODUCTION This service manual provides a variety of service form. This CD-ROM Drive was manufactured and information. It contains the mechanical structure of assembled under our strict quality control standards the CD-ROM Drive together with mechanical and meets or exceeds industry specifications and adjustments and the electronic circuits in schematic standards.
  • Page 2: Location Of Customer Controls

    LOCATION OF CUSTOMER CONTROLS FRONT COMPACT Figure 1. Front View Headphone Jack Play/Skip Button 3.5mm jack for monitoring the audio signal from audio When an Audio CD is in the Disc Drawer, pressing CDs. this button will start playing audio CDs from the first track.
  • 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) Focus Servo On (FEO(IC501 Pin 12 ) signal generation) Rotate disc.
  • 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. [TP5:V13(1.3V) and GND.] Is the CLOCK Frequency of Does “H” output in IC501 pin IC501 pin 33.86MHz? Check and replace R705, R706, Q701 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 1.3V at IC201 pin Check IC501. Do the signals appear in PN301 pin? Replace IC201.
  • Page 6 C. The Laser of Pick-Up doesn’t light. Is the voltage of IC501 pin Check Q101, C101, C102 and then replace IC101. (LD0) 1V? 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 to R225...
  • 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-) (FAO) Fig. D-1. F0S0 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(IC501 pin ) when Replace Pick-Up. F + (TP10) during focus the R126 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: DMS0 Fig. E-3. DMS0 Signal...
  • Page 10 F. TOC isn’t read. Is the Focus Servo ON? Does A, B, C, D signal (Does FEO(IC501 pin appear at IC501 pin signal appear?) Replace IC501. Refer to C. (The Laser of Pick-Up Is the Tracking Servo ON? Does E, F signal appear doesn’t light.) (Does TEI (IC501 Pin at IC501 pin...
  • Page 11 G. During Audio CD play, LED flickers, but Speaker is silent. Does Audio signal appear Replace IC501. at IC501 pin 110 112 (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 IC701 Replace IC701.
  • 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. PIN3 of IC601 PIN12 of IC601 Fig. G-1. Audio Signal...
  • Page 13: Cabinet And Circuit Board Disassembly

    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 • IC201 (M63022FP) : 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.
  • Page 16 • IC501 (MT1199E) : RF+DSP+ATAPI DECODER+µ-COM Block Diagram RFOP IPLLVDD RGND R E F P D M Mega Interface DGND & and GPIO Control SVDD P W M SGND D A C Data PLL Reset R F R P A P C a n d Circuitry Data Slicer...
  • Page 17 • IC501 MT1199E Pin Description Pin Numbers Symbol Type Description RF Interface RGND Ground Ground pin for RF and related analog circuitry. RVDD Analog Power for RFand related analog circuitry. Power(3.3V) Analog Input RF signal input. SVDD Analog Power for servo signal generator and related analog circuitry. Power(3.3V) Analog Input Main beam I-V amplifier (A+C) input.
  • Page 18 Data Slicer & Data PLL Interface PLLVSS Ground Ground pin for data PLL and related analog circuitry. SPDOP Analog Output Vco dac positive output. SPDON Analog Output Vco dac negative output. LPFON Analog Output The negative output of loop filter amplifier. LPFOP Analog Output The positive output of loop filter amplifier.
  • Page 19 UP1_0 TTL I/O, Slew rate Programmable bi-directional I/O. / UA16 50K pull_up Alternate function : A16. Address bit 16 output. Input 3.3V/5V tolerance, output 3.3V 44,45,46,47, UP2_[7:0] TTL I/O, Slew rate Programmable bi-directional I/O. 48,49,51,52 / UA[15:8] 50K pull_up Alternate function : A[15:8]. Upper address bus input/output. Input 3.3V/5V tolerance, output 3.3V UPSEN_ TTL I/O...
  • Page 20 CASH_ TTL Output Column Address Strobe High / RAM Write Enable High. When a 16-bit DRAM is used, this pin functions as Column address Strobe / RWEH_ Slew rate High for accessing the upper bytes of a two-CAS_ DRAM if TWE 63h.RW6 is 0, or as Write Enable High for writing the upper bytes of a two-WE_ DRAM.
  • Page 21 CS3FX_ TTL Input, SMT Device Chip Select 1. This is the chip select signal from the host to 50K pull_up select the Control Block Registers. CS1FX_ TTL Input, SMT Device Chip Select 0. This is the chip select signal from the host to 50K pull_up select the Command Block Registers.
  • Page 22 136~137 DD[15:0] Device Data. This is the 8-bit or 16-bit bi-directional data bus to the TTL I/O host. The lower 8 bits, DD0—D D7, are used for 8-bit data transfers. 139~143 pull_up Note : All pins except DD7 may be selectively pull up/down with 20k 145~148 / pull_down resistant.
  • Page 23 Motor and Actuator Driver Interface TTL Input, SMT Motor Hall sensor input. 50K pull-up DVDD Power(5V) Power pin for internal digital circuitry. ENDM TTL Output Enable/disable disk motor. A logical high enables disk motor. DGND Ground Ground pin for internal digital circuitry. HRFZC Digital Input High speed mirror signal input...
  • Page 24 BLOCK DIAGRAM DRAM 33.86MHz Optical Disc Pick-up Motor unit MT1199E I/F Cable RF+DSP+Decoder+ System controller SPINDLE FOCUS TRACKING SLED LOADING MOTOR COIL COIL MOTOR MOTOR M63022FP 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)