Sony HCD-GTX777 Service Manual page 30

HCD-GTX777/GTX787/GTX888
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[RF LEVEL CHECK]
BD93 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. Confi rm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape "
be clearly distinguished at the center of the waveform.
RF signal waveform
Connecting Location: CD board
TE
L 13942296513
– BD93 Board (SIDE B) –
TP124
(VC)
51
75
TP123
50
76
(RFO)
IC101
100
26
1
25
TP106
(FE)
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oscilloscope
+
–
" can
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
±
level: 1.3 0.3 Vp-p
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