Sony hcd-tb20, Руководство по обслуживанию

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HCD-TB20
Note: Clear RF signal waveform means that the shape “ ‡ ” can be
clearly distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1. Connect an oscilloscope to TP (TE1) and TP (DVC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number nine track.
4. Press the
BX button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e. A=0V)
Adjustment Location:
[BD BOARD] (Conductor Side)
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65
±
0.15Vp-p (RFDC)
1.1
±
0.4Vp-p (RFAC)
TP(TE1)
TP(DVC)
BD board
oscilloscope
level=1.0
±
0.5Vp-p
symmetry
A (DC voltage)
center of
waveform
B
DVC
1 track jump waveform
TP (TE1)
TP
(RFAC)
TP
(RFDC)
TP (FE1)
IC101
IC103
RV101
TP (DVC)
1 15
30
1
20 21
40
60
80
41
61
16
TP
(FEI)