5-3. CD SECTION
Focus Bias Check This check is to be done when the optical block replaced. Check Procedure: 1. Connect the oscilloscope to test point TP (RF) on CD board. Insert disk (YEDS-18 (3-702-101-01)). 2. Press the u button. 3. Check that the 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. 4. Release test mode after adjustment is completed. � RF signal reference waveform (eye pattern)
VOLT/DIV : 50mV TIME/DIV : 500 ns (With the 10:1 probe in use) 1.1- 1.3 Vp-p
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.
