Read Sony HCD-GTX66 / HCD-GTX77 / HCD-GTX77BP / MHC-GTX66 / MHC-GTX77 / MHC-GTX77BP Service Manual online
30
HCD-GTX66/GTX77/GTX77BP
[RF LEVEL CHECK]
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
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.
Connecting Location: CD board
+
–
–
TP123(RFO)
TP124(VC)
oscilloscope
BD91 board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF signal waveform
level: 1.3
±
0.3 Vp-p
IC401
– BD91 Board (SIDE B) –
TP124
(VC)
TP123
(RFO)
TP106
(FE)
IC101
1
1
14
15
28
25
26
50
51
75
76
100
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