Sony CFD-G500 Service Manual page 14

CFD-G500/G500L
Adjustment Location:
– MAIN board (component side) –
TP (FM IN)
(CONDUCTOR SIDE)
T1
T2
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 4 and pin qa
(or TP (RF) and TP (VREF)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the NX (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 : 50 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.
14
L3-2
L1
CT1
L2
IC1
) in the
RF level :
0.85 ± 0.2 Vp-p
L3-1
CT5
CT3
L4
Test Point:
– CD board (conductor side) –
R706
R701
C739
C707
C732
TP
(VREF)
TP (VT)
(CONDUCTOR SIDE)
IC2
TP
(RF)
R711
R710
R713
C731
JW726
C705
C703
C709
R729
C711