Cd Section - Sony PMC-R30L Service Manual

Adjustment Location:
– MAIN board (component side) –
CNP2
LW L4
TRACKING
CT1
ADJUSTMENT
TU1
TP (VT) (conductor side)

CD SECTION

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin #£ (TP RF) and
GND on CD board.
2. Set the Test Disc YEDS-18 (CD). (Part No. : 3-702-101-01)
3. Press the ^ (CD) 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 (
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
CFT1
AM IF
ADJUSTMENT
) in the
RF level :
1.2 ± 0.1 Vp-p
– 14 –
L3 MW
TRACKING
CT2
ADJUSTMENT
FREQUENCY
COVERAGE
ADJUSTMENT
IC1
Test Point:
– CD board (conduction side) –
C709
52
C707
1
40
IC701
13
39
14
27
C723
26
C737
C738
TP (RF)
CT3
LW
MW
CT4
FREQUENCY
COVERAGE
L5
ADJUSTMENT
1
C706
R704
R701
R706
16
CNP701
C711
R721
C712
R720