Sony MHC-DX50 Service Manual page 20

HCD-DX50/RG80
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
BD board
TP(TEO)
TP(DVC)
Procedure :
1. Connect an oscilloscope to TP (TEO) and TP (DVC).
2. Turn Power switch on.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the gG button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
DVC
level=1.0 ±0.5Vp-p
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e. A=0V)
18
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65 ±0.15Vp-p (RFDC)
1.1 ±0.4Vp-p (RFAC)
oscilloscope
center of
waveform
B
A (DC voltage)
symmetry
Adjustment Location:
[BD BOARD] (Conductor Side)
TP (DVC)
TP
15 1
(RFAC)
IC103
21
16 30
TP (FEO)
40
IC101
TP (TEO)
41
TP
(FEI)
TP
(RFDC)
60
RV101
20
1
80
61