Sony CFD-G555CP Service Manual page 22

CFD-G555CP/G555CPK
Adjustment Location:
L1,CT1 – TUNER BOARD (Component Side) –
FM TRACKNG
ADJUSTMENT
TP-ANT
L1
(JW2)
T1
T1
AM IF
ADJUSTMENT T2
T2
FM IF
ADJUSTMENT
– TUNER BOARD (Conductor Side) –
TP-ANT
JW2
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 (VC)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the u (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.
22
L3
CT3
CT1
L2
L4
IC1
L2 L4
FM FREQUENCY AM FREQUENCY COVERAGE
COVERAGE ADJUSTMENT
ADJUSTMENT
TP
(GND)
TP
(CV)
) in the
RF level :
0.85 ± 0.2 Vp-p
L3,CT3
AM TRACKING ADJUSTMENT
Test Point:
– CD/MP3 Board (Side B) –
CD/MP3 board (side B)
TP TP
(RF) (VC)
IC7