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First, try other CDs to be sure the problem isn't with the particular CD you are playing. If it's just the one CD, try cleaning the CD with soap and warm water, then drying lightly with a soft cloth. If it has trouble playing ALL CDs, it the lens on the CD player may be dirty. This is especially likely if the device is in an area where it is exposed to cigarette smoke or heavy dust. If you're technical, the lens can be cleaned VERY GENTLY with a cotton swab dampened with a tiny amount of isopropyl (rubbing) alcohol. If you are not technical, you will need to have a technician clean the lens. There are also various lens cleaning kits available at your local electronics store or music store which have special lens cleaning CDs, many of which are effective.
The error 4 in most Sony stereos is an error that comes up when the laser pickup doesn't read the disc correctly. This happens most of the time because of a dirty lens in the laser pickup. If anyone smokes in the vehicle the smoke may be on the lens causing the error code. Try a wet type CD cleaning disc to see if it helps.
Please try to put in an ordinary audio CD track and see if this is detected. If yes the optical is working, if not there is no laser scanning ,then the possibility of the head being faulty is high. Now certain cleaner disks are not read and so will not be tracked. Hence it could reject but the best is do a cleaning manually of the laser head eye with a cotton bud very softly and without any pressing of the lens eye. If there is still no result then watch the CD if it spins or tries to spin. If the head unit moves up or down to focus or in and out of the drive, if so the board seems to work correctly and the possibility of the optical head being the suspected fault is closer. But if any of the above seems otherwise we must recheck with possibilities of the processor board
The CD motor could be faulty if you cannot hear any spinning noises from it from it loading or the lens could be faulty resulting in not enabling the dvd to register its prescence in the player to spin the disk.
Your code means an electrical/mechanical failure. Follow this:
1. If the cartridge is stucked try to force it out slowly with a fine screwdriver.
2. Once is out or if already out without forcing it, remove all remaining CD's.
3. Insert a laser lens CD cleaner.
4. Clean it at least 3 times.
5. The unit must be disconnected from the 12V signal to be reset it at least 5 minutes, then reconnect.
6. If problem re-appears repeat procedure once more. If problems still, your laser lens is damaged and need replacement. Probably from $40.00 to $55.00.