Read Sony CX-JV10 / JAX-V10 Service Manual online
18
CX-JV10
SECTION 5
ELECTRICAL ADJUSTMENTS
CD SECTION
Note:
1.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
2.
Use an oscilloscope with more than 10M
Ω
impedance.
3.
Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
signal level is low than specified value with the following checks.
S-CURVE CHECK
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (FE) and TP (VC) on
the BD board.
2. While depressing the
B
key, insert an AC plug.
3. Put the disc (YEDS-18) in and press the
x
key and actuate
the focus search. (actuate the focus search when disc table is
moving in and out)
moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2
±
1
Vp-p.
Note:
•
Try to measure several times to make sure than the ratio of A : B
or B : A is more than 10 : 7.
or B : A is more than 10 : 7.
•
Take sweep time as long as possible and light up the brightness
to obtain best waveform.
to obtain best waveform.
Connecting Location: BD board (Conductor Side) (See page 19)
oscilloscope
BD board
TP (FE)
TP (VC)
+
–
–
S-curve waveform
symmetry
within 2
±
1 Vp-p
A
B
RFDC LEVEL CHECK
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (RFDC) and TP (VC)
on the BD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFDC
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.
Note:
A clear RFDC signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
Connecting Location: BD board (Conductor Side) (See page 19)
RFAC LEVEL CHECK
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (RFAC) and TP (VC)
on the BD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFAC
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
Note:
A clear RFAC signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
Connecting Location: BD board (Conductor Side) (See page 19)
oscilloscope
BD board
TP (RFDC)
TP (VC)
+
–
–
RFDC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 0.6
±
0.15 Vp-p
oscilloscope
BD board
TP (RFAC)
TP (VC)
+
–
–
RFAC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 1.0
±
0.4 Vp-p
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