CD ROM Repairing


CD ROM
(Compact Disk Read Only Memory)

COMPONENTS OF CD ROM

  • IC’S
  • Chips
  • MICRO-RESISTANCE
  • MICRO-CAPACITOR
  • PACKAGE
  • FUSE
  • MICRO-COIL

Parts of CD Rom

  1. Lens   (+5V DC)
  2. Stepper Motor  (+12V DC)
  3. Servo motor for CD (+12V DC)
  4. Main PCB (Print Circuit board) (+5V DC)
  5. Eject Motor (+12V DC)
  6. Eject mechanism or Lens mechanism
  7. Eject motor / Eject sensor switch
  8. Switches for operate front panel
  9. Volume variable / switches
  10. Stereo pin for real audio sound out
  11. Data strip or data cable

Problems of CD Rom

  1. Dead
  2. Reading Problem
  3. Real audio read but VCD & software CD’s not read
  4. Servo motor not operate
  5. Tray IN/Out eject problem
  6. Switches not work
  7. CD Rom not detect
  8.  Lens problem

1. Dead

  1. Check the input +5V & +12V
  2. Check the main power connector
  3. Check the dry sold & resold the main power connector
  4. Check the fuse 0 & 000 Ohm’s resistance around   the main power connector
  5. Check the fuse 0 & 000 Ohm’s resistance around the all SMD chip whole the PCB
  6. Check hot, burn micro components & SMD chip whole the PCB
  7. Replace the PCB with same make & model

2. Reading Problem

  1. Clean lens with cotton bud
  2. Check the Door / Try switch is it properly work
  3. Clean the PCB
  4. Clean & resold the main interface connector
  5. Check the data cable is it properly connect on pin 1
  6. Alignment the lens variable
  7. Replace the lens with same make & model

3. Real Audio Read but Vcd & Software
    CD’s not Read

  1. Clean the all parts & it’s controller card or PCB
  2. Resold the interface connector
  3. Clean lens with cotton bud
  4. Alignment the lens variablz

4. Servo Motor not Operate

  1. Verify the +12V input the CDROM
  2. Resold the main power connector
  3. Check hot & burn SMD chip of servo motor
  4. Check & clean the SMD chip of servo motor
  5. Replace the SMD chip of servo motor with same make & model
  6. Replace the motor with same make & model
  7. Replace the controller card or main PCB

5. Try In / Out & Eject problem

  1. Check the data cable is it properly connect on pin 1
  2. Check the damage gears of mechanism
  3. Check the gears is it properly work & greasing it
  4. Replace the rubber belt of eject motor
  5. Spray & eject switch change
  6. Check, clean & replace the eject switch
  7. Spray or change eject door or tray sensor
  8. Resold the main power or eject motor connector
  9. Resold & clean the eject motor chip
  10. Replace the eject SMD chip with same make & model
  11. Change the PCB with same make & mode

6. Switches not Work

  1. Check the switch
  2. Spray the switch & clean it
  3. Replace the switch

7. CD Rom not Detect

  1. Check the interface data cable
  2. Check the jumper setting
  3. Check the BIOS setting
  4. Check the dry sold of main interface connector of CD Rom & where it connected
  5. Check the 0 & 000 OR 33 Ohm’s resistance beside the interface connector
  6. Change the PCB with same & model

8. Lens Problem

  1. Clean the lens with cotton bud
  2. Check the input +5V DC
  3. Check the stepper motor properly work
  4. Check the strip OR Data cable of lens loosing, dry sold where it connected properly buses damage

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