Read Sony ICF-CD7000 Service Manual online
14
ICF-CD7000
CD SECTION
Perform all CD section check in the test mode.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
CD board.
2. Insert the test disc (PATD-012). (Part No. 4-225-203-01) (CD)
3. While playing the CD, set the CD test mode (Refer to CD
3. While playing the CD, set the CD test mode (Refer to CD
TEST MODE (See page 11)) (Automatic adjustment value is
held at this time).
held at this time).
4. Set the FOCUS 2 MODE.
5. Confirm that the oscilloscope waveform is as shown in the
5. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
6. Release the CD test mode.
7. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
7. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
8. Perform confirmation in the same manner as step 3 to 6.
• RF signal reference waveform (eye pattern)
Connecting Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
CD:
1.0 to 1.6 Vp-p
CD-RW:
1.2
1.0 to 1.6 Vp-p
CD-RW:
1.2
±
1.8 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
– CD BOARD (Conductor Side) –
IC701
TP (RF)
TP (VREF)
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