Read Sony ICF-CD555TV Service Manual online
15
ICF-CD555TV
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. Set the CD TEST MODE. (Refer to CD TEST MODE (See
page 9))
3. Insert the test disc (YEDS-18). (Part No. 3-702-101-01) (CD)
4. Press the
4. Press the
7
key. (LPC ON)
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. Press the
7
key. (LPC OFF)
7. Perform confirmation in the same manner as step 5.
8. Press the
8. Press the
s
key.
9. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
10. Perform confirmation in the same manner as step 4 to 7.
•
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:
1.1
1.1
±
0.2 Vp-p (LPC ON)
1.1
±
0.3 Vp-p (LPC OFF)
CD-RW:
1.0
1.0
±
0.2 Vp-p (LPC ON)
0.9
±
0.3 Vp-p (LPC OFF)
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
TP
(RF)
TP
(TE)
TP
(VREF)
IC701
IC702
– CD BOARD (Conductor Side) –
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