AIWA CSDMD50EZ
Service Manual

2-8. Checking Servo Operation
� Checking the focus search and spindle kick: 1 1) When the MD 2 button is pressed while the machine is in the �ALL SV OFF� status without inserting a disc, focus search and spindle kick are performed continuously. The message �FOCUS SRCH� appears on the display. 2) After the check is completed, press the 9 button to show the message �ALL SV OFF� on the display. � Checking the focus search and spindle kick: 2 1) When the �TUNER/BAND� button is pressed while the machine is in the �ALL SV OFF� status with a disk inserted or without inserted, focus search and spindle kick are performed continuously . The message �FOCUS CHECK� appears on the display. The S curve characteristics can be checked when a disc is inserted. 2) After the check is completed, press the 9 button to show the message �ALL SV OFF� on the display. � 1) 2) 3) Checking the focus servo Insert a test disc. Move the laser pickup to the center of a disc using the 6 button and 5 button. Press the TAPE 1 2 button, and set the servo mode of the inserted disc as follows. MO disk (MO) ................................... Select the �SELECT GRV� display. PIT disk (CD) .................................... Select the �SELECT PIT� display. 4) Press the MD 2 button. When the focus servo has no problem, the messages �FOCUS SRCH� appears then �FOCUS ON!� appears on the display. 5) After the check is completed, press the 9 button to show the message �ALL SV OFF� on display. � Checking that all servos are turned ON 1) When the �ENTER� button is pressed while the machine is in the �FOCUS ON!� status, the tracking and sled servos are turned on and all servos start moving. When the all servos have no problem, the message �ALL SV ON� appears on the display. 2) After the check is completed, press the 9 button to show the message �ALL SV OFF� on display.

3. ADJUSTMENT (MD)
3-1. Temperature Compensation Adjustment
Test point: Adjustment result is shown on the display Jig: Thermometer Adjustment method: 1) After activating the MD TEST mode, press the 9 button to display the �ALL SV OFF� . 2) Press the �DISP� button to change the display to �TEMP=$���. 3) Press the �EDIT� button to change the display into �TMP+**c:±## �. 4) Place a thermometer near MD mechanism to measure the room temperature. 5) Perform adjustment by pressing the 6 and 5 buttons until the thermometer reading and the value ** that is shown on the display agree. Press the �ENTER� button. 6) After the adjustment is completed, press the 9 button to display �ALL SV OFF�. 7) When the setting is completed, display the �TMP+**c:+##� again and check the value that is calculated by adding or subtracting the ## value to and from ** must be the room temperature. Note: Don�t perform the above adjustment if the room temperature cannot be measured.

3-2. Laser Power Adjustment
Test point: Pick up laser output Jig: Laser power meter Adjustment method: 1) Press the �TIMER/CLOCK� button three times in the �ALL SV OFF� state to change the display to �LASER WRITE�. 2) Press the �EDIT� button once to display �LASER=$**�. 3) Measure the pick up laser output using the laser power meter, and perform adjustment so that the measuring value is 6.8± 0.03mW by pressing the 6 and 5 buttons. After the adjustment is completed, press the �ENTER�button. 4) Press the 9 button to display �ALL SV OFF�. Note: If laser output exceeds 7.0mW, the pick up may be damaged.

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