Read Sony HCD-DX70 Service Manual online
19
HCD-DX70
Note: Clear RF signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
Procedure:
1.
1.
Connect oscilloscope to TP (TEO) and TP (DVC) board.
2.
Turned Power switch on.
3.
Load a disc (LUV-P01) and playback the number nine track.
4.
Press the bB button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
1 track jump waveform
6.
Adjust RV101 so that A (DC voltage) becomes 0.
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 0.65
± 0.15Vp-p (RFDC)
1.1
± 0.4Vp-p (RFAC)
oscilloscope
BD board
TP (TEO)
TP (DVC)
TP (DVC)
+
–
–
DVC
Center of
waveform
waveform
B
Symmetry
A (DC voltage)
level=1.0
±0.5Vp-p
Checking Location:
[BD BOARD]
DVC
RFAC
RFDC
FEO
TEO
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