Sony HCD-GTX88 Service Manual page 30

HCD-GTX88
[RF LEVEL CHECK]
BD91 board
TP123(RFO)
TP124(VC)
Procedure :
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape " ◊ " can be
clearly distinguished at the center of the waveform.
RF signal waveform
Connecting Location: CD board
– BD91 Board (SIDE B) –
TP124
(VC)
51
75
TP123
76
(RFO)
IC101
100
1
25
TP106
(FE)
30
oscilloscope
+
–
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.3 ± 0.3 Vp-p
15
28
IC401
1
14
50
26