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Text excerpt from page 25 (click to view)
HCD-HP7
CD SECTION
Note: 1. CD Block is basically constructed to operate without adjustment. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10 M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. 5. Check the focus bias check when optical block is replaced. Focus Bias Check
oscilloscope (DC range) BD board TP (RF) TP (VC)
+ �
s
Procedure : 1. Connect oscilloscope to TP (RF) and TP (VC) on the BD board. 2. 3. 4. Press the ?/1 button to turn the power on. Put disc (YEDS-18) in and press the N (CD) button to playback. Confirm that oscilloscope waveform is as shown in the figure below. (eye pattern) A good eye pattern means that the diamond shape ( ) in the center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV TIME/DIV: 500 ns
