Cd Section - Sony PHC-ZW770L Service Manual

Adjustment Location: main board
FH1
ANTENNA
TERMINAL
CT3
MW
TRACKING
L3-1
ADJUSTMENT
FREQUENCY
COVERAGE
ADJUSTMENT
FM
TRACKING
ADJUSTMENT

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 RFO) and
GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the ^ 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.
L2
FM
CT1
L1
RF level :
1.3 ± 0.5 Vp-p
– MAIN BOARD (COMPONENT SIDE) –
Test Point:
TP (RFO)
) in the
– 14 –
LW
L3-2
TRACKING
ADJUSTMENT
CT5
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
TP (VT)
JW17
T1
MW IF
ADJUSTMENT
– CD board (conductor side) –
TP (RFO)