Sony Walkman D-F20, Руководство по обслуживанию

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8
D-F20
TP629
RF
– MAIN BOARD (SIDE B) –
Adjustment Location:
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 TP629 (RF) and GND on
main board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
N X 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 ( ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Test Point:
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
CN501
IC61
TP81
VT
TP3
RF-IN
– MAIN BOARD (SIDE A) –
CT3 L4
L3
L1
CT1
L2
FM TRACKING ADJ
AM IF ADJ
T1
AM TRACKING
ADJ
RF level :
0.45
±
0.1 Vp-p
VOLT/DIV : 20 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
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