Sony ICF-CD523 Service Manual page 14

ICF-CD523
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
Connection:
MAIN board
TP513 (RF)
TP568 (GND)
Procedure:
1. Connect the oscilloscope to TP513 (RF) and TP568 (GND)
on the MAIN board.
2. Insert the CD test disc (PATD-012). (Part No. 4-225-203-01)
3. Press the CD u button.
4. Confirm 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.
• RF Signal Reference Waveform (Eye Pattern)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
Connecting Location: MAIN Board (See page 15)
14
oscilloscope
(AC range)
+
–
1.2 ± 0.3 Vp-p