Denon DVM-4800 Service Manual

Also see for DVM-4800: Specifications Operating instructions Service manual Operating instructions

Contents

5DVM-48002. OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENTPROCEDURE2.1 Self-diagnosisThe optical pickup self-diagnosis function and tilt adjustment check function have been included in this unit. When repairing,use the following procedure for effective Self-diagnosis and tilt adjustment. Be sure to use the self-diagnosis function beforereplacing the optical pickup when "NO DISC" is displayed. As a guideline, you should replace the optical pickup when thevalue of the laser drive current is more than 55.Note:Press the power button to turn on the power, and check the value within three minutes before the unit warms up.(Otherwise, the result will be incorrect.)"NO DISC" is displayed, unit doesnot play smoothly, etc.Check the laser drive current.Value is 70 (DVD),55 (CD) or lessValue is more than70 (DVD), 55 (CD)Replace the optical pickup (Referto the section "OPTICAL PICKUPREPLACEMENT PROCEDURE"in this Guide.)Check the laser drive current afterreplacement.Write the present value into theunit if it is 60 (DVD), 45 (CD) orless.Do the optical pickup tilt adjust-ment. (Refer to the section "TILTADJUSTMENT" in this Guide.)Use the tiltadjustment checkfunction.Initialize the player.Use the optical pickup self-diagnosis function.Method: With no disc in the player:• Press the "DISPLAY" button on theremote control unit while pressing the"PAUSE" and "OPEN/CLOSE" buttons onthe player.[Display content]Factory setting Present valueReplace with a new optical pickup if the presentvalue is more than 60 (DVD), 45 (CD).Cause: Damage due to static electricity duringreplacement.Method: With no disc in the player:• Press the "DISPLAY" button on the remotecontrol unit while pressing the "PAUSE" and"OPEN/CLOSE" buttons on the player.Writing Method:• Press the "PAUSE" button on the remotecontrol unit while pressing the "PAUSE" and"OPEN/CLOSE" buttons on the player.Write the present valueinto the player if it is 45or less.