Read Sony BMZ-K33 / CX-BK33 Service Manual online
29
CX-BK33
Note:
1.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
2.
Use an oscilloscope with more than 10MW 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
N
button, insert an AC plug.
3. Put the disc (YEDS-18) in and press the
x
button 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.
obtain best waveform.
Checking Location: BD board (Side 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.
CD SECTION
Checking Location: CD board (Conductor side)
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.
Checking Location: BD board (Side B)
+
–
–
BD board
TP (FE)
TP (VC)
oscilloscope
S-curve waveform
A
B
symmetry
within 2
±
1 Vp-p
+
–
–
BD board
TP (RFDC)
TP (VC)
oscilloscope
RFDC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 0.6
±
0.15 Vp-p
+
–
–
BD board
TP (RFAC)
TP (VC)
oscilloscope
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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