Notes on CD Technology and Repair of CD players and CDROM drives INDEX V2.50 (3/26/96)

	Table of Contents
	Chapter 1) About the Author & Copyright
	Chapter 2) Introduction
	2.1) Compact discs and the digital audio revolution
	2.2) Repair or replace?
	Chapter 3) CD Digital Audio Technology
	3.1) General Introduction to CD Technology
	3.2) CD information storage and playback
	3.3) CD (disc) construction
	3.4) And you thought driving on a narrow winding country road was tough!
	3.5) CD optical pickup operating principles
	3.6) For more information on CD technology
	Chapter 4) CD Player Placement, Preventive Maintenance, and CD Care
	4.1) General CD player placement considerations
	4.2) Preventive Maintenance (PM)
	4.3) CD protection and handling
	4.4) CD cleaning
	4.5) Rental or library CD considerations
	4.6) Repairing a scratched CD
	4.7) CD enhancers
	Chapter 5) CD Player and CDROM Drive Troubleshooting Guide
	5.1) Safety
	5.2) Troubleshooting tips
	5.3) Test equipment
	5.4) Test CDs
	5.5) Getting inside a CD player or CDROM drive
	Chapter 6) CD Player and CDROM Drive Fundamentals
	6.1) Parts of a CD player or CDROM drive
	6.2) Power supply
	6.3) Electronics board
	6.4) The optical deck
	6.5) Components of the optical pickup
	6.6) Classification of CD player problems
	6.7) Most common CD player problems
	6.8) General inspection, cleaning, and lubrication
	6.9) Lubrication of CD players
	Chapter 7) General System Problems
	7.1) Unit is totally dead
	7.2) CD player is operational but there is no display
	7.3) CD player ignores you
	7.4) Drawer does not open or close
	7.5) Drawer operation is erratic
	7.6) Drawer does not close completely
	7.7) Intermittent operation
	7.8) CD player or CDROM drive overheats
	Chapter 8) Startup Problems
	8.1) What is a startup problem?
	8.2) Startup sequence
	8.3) Procedure for validating the startup sequence
	8.4) Disc spins in wrong direction or overspeeds and is never recognized
	Chapter 9) Tracking (Play and Seek) Problems
	9.1) Description of these types of failures
	9.2) Short distance skipping
	9.3) Playback gets stuck (rapid repeat)
	9.4) Occasional long distance skipping or repeating
	9.5) Player gets stuck at approximately same time on multiple discs
	9.6) Search or seek operations take too long or fail to complete
	9.7) Search, seek, or play starts at proper place but then loses time or position
	9.8) Repetitive noise at disc rotation rate (500-200 rpm depending on track)
	9.9) Testing the sled for mechanical problems
	Chapter 10) Miscellaneous Problems
	10.1) Audio problems
	10.2) Problems with the digital circuitry
	10.3) Problems with the analog circuitry
	10.4) Boomboxes and compact stereo systems
	10.5) CD player was dropped or got wet
	10.6) Repairing flexible printed cables
	10.7) Testing the optical pickup
	Chapter 11) Servo Systems and CD Player Adjustments
	11.1) Servo systems
	11.2) Play adjustments
	11.3) Adjustment procedure for noise or skipping
	11.4) Repetitive noise at disc rotation frequency
	11.5) Short distance skipping or sticking
	11.6) General servo adjustment procedure
	11.7) Low laser power
	11.8) Optical alignment
	Chapter 12) Motors and Spindles
	12.1) Small motors in CD players
	12.2) Problems with small PM motors
	12.3) Testing of motors
	12.4) Reviving a partially shorted or erratic PM motor
	12.5) Motor bearing problems
	12.6) Spindle motor problems
	12.7) Spindle motor replacement
	Chapter 13) Notes on Specific Equipment
	13.1) Pioneer PDM series test mode
	13.2) Pioneer spindle motor voltage (operating normally)
	13.3) Pioneer spindle motor problems
	13.4) Pioneer PD-M400/500/600 etc. servo adjustment procedure
	13.5) Notes on Sony CDU31/33A CDROM drives
	13.6) Disassembling the Sony CDU31/33A CDROM drive
	Chapter 14) Testing of Optical Pickup Assemblies
	14.1) Introduction
	14.2) When and why to test the pickup
	14.3) Required tools, documentation, and test equipment
	14.4) Precautions
	14.5) Basic description of optical pickup
	14.6) Testing the laserdiode while in the player
	14.7) Testing the laserdiode with an external power supply
	14.8) Laser power adjustment
	14.9) Testing the focus and tracking actuators
	14.10) Testing the photodiode array
	Chapter 15) Items of Interest
	15.1) What is oversampling?
	15.2) Golden ears and technohype
	15.3) That last little decimal point
	15.4) Can a CDROM disc damage a CD player?
	15.5) Converting a CD player into a CDROM drive
	15.6) Using a CDROM drive as a stand-alone CD player
	15.7) Interesting CD player signals
	15.8) The CD player 'eye' pattern
	15.9) Focus and tracking drive or error signals
	15.10) Focus, tracking, and error correction performance
	15.11) CD technology basic specifications
	15.12) IR detector circuit
	15.13) Laserdiode fundamentals
	15.14) CW Laser Light (reverse engineered from commercial unit)
	Chapter 16) Service Information
	16.1) Advanced CD troubleshooting
	16.2) Suggested references
	16.3) Rubber belts in CD players
	16.4) Interchangeability of electronic and mechanical components
	16.5) Interchangeability of components in the optical pickup
	16.6) Recommended parts suppliers