SONY DF411
Manual de Servicio

SECTION 5 ADJUSTMENTS
CD SECTION
Precautions for Adjustment 1. Before beginning adjustment, set the equipment to service mode. After the completion of adjustment, be sure to reset the service mode. For more information, see �Service Mode (service program)� on page 8. 2. Perform adjustments in the order given. 3. Use the disc (YEDS-18. Part No. 3-702-101-01) unless otherwise indicated. 4. Power supply voltage requirement : DC 4.5 V HOLD switch : OFF VOLUME : Minimum BASS BOOST switch : NORM AVLS switch : OFF Before Beginning Adjustment Set the equipment to service mode (See page 8) and check the following. If there in an error, repair the equipment. � Checking of the sled motor 1. Open the upper panel. 2. Press the + and = keys and check that the optical pick-up can move smoothly without sluggishness or abnormal noise from innermost periphery to outermost periphery then to innermost periphery. + : The optical pick-up moves outwardly = : The optical pick-up moves inwardly � Checking of focus searching 1. Open the upper panel. 2. Press the ^ key. (Focus searching operation is activated continuously). 3. Check the object lens of the optical pick-up for smooth up/down motion without sluggishness or abnormal noise. 4. Press the p key. Check that focus searching operation is deactivated. If not, again press the p key slightly longer.
+ �

Focus Bias Check Condition : � Hold the set in horizontal state. Procedure : [MAIN BOARD] (Side B)
oscilloscope (AC range) 2k � IC501 @£ pin (RFO)

IC501 #º pin (VC)

23 30

IC501

1. Set the equipment to service mode stop state (See page 8). 2. Connect the oscilloscope between IC501 @£ pin (RF0) and #º pin (VC) on the MAIN board. 3. Move the optical pick-up by Pressing the + and = keys. 4. Put the disc (YEDS-18). 5. Press the ^ key. From focus searching, focus is turned ON while entering CLV drawing-in mode. Tracking and sled are turned OFF.

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6. Press the PLAY MODE key. (Both tracking and sled are turned ON). 7. Check the oscilloscope waveform is as shown below. A good eye pattern means that the diamond shape (�) in the center of the waveform can be clearly distinguished.

RF level 0.85 � 1.15V

� RF Signal Reference Waveform (eye pattern) To watch the eye pattern, set the oscilloscope to AC range and increase the vertical sensitivity of the oscilloscope for easy watching. 8. Stop removing of the motor by pressing the p key. 9. After the completion of adjustment, reset service mode. (See page 8 )

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