21
RCD-W10
SECTION 5
ELECTRICAL ADJUSTMENTS
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent
when the 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 (DVC) on
the BD board.
2. Turn the power on.
3. Load the disc (YEDS-18).
4. Enter the test mode, select the BU Test asd press the
l
AMS
L
(DECK B) knolo to display “bdt S CURVED”.
5. Press the
l
AMS
L
(DECK B) knob. “LD AL” is
displayed and playback starts automatically.
6. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3.6
±
0.5 Vp-p.
7. Press the MENU/NO button to stop playback.
8. Exit fromthe test mode.
(Refer to the TEST MODE Section)
Note:
Try to measure several times to make sure than the ratio of A
: B or B : A is more than 10 : 7.
RF Level Check
Connection :
Procedure :
1. Connect an oscilloscope to TP (RFAC) and TP (DVC).
2. Turn the power on.
3. Load the disc (YEDS-18) and playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
CD SECTION
(DECK A)
Note:
A 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
Connection :
Procedure:
1.
Connect an oscilloscope to TP (TE) and TP (DVC).
2.
Turn the power on.
3.
Load the disc (YEDS-18) and playback the number five track.
4.
Press the CD
X
(DECK A) button.
(Becomes the 1 track jump mode.)
5.
Confirm the level B and A (DC voltage) on the oscilloscope
waveform.
Specification level:
x
100=less than
±
22%
[BD BOARD] — SIDE A —
A
B
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.1
±
0.3Vp-p
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.1
±
0.6Vp-p
IC101
IC103
IC104
TP (DVC)
TP (TE)
TP (RFAC)
TP (FE)
+
–
BD
board
TP (FE)
TP (DVC)
oscilloscope
(DC range)
A
B
symmetry
within 3.6
±
0.5 Vp-p
+
–
BD board
TP (RFAC)
TP (DVC)
oscilloscope
(AC range)
+
–
BD board
TP (TE)
TP (DVC)
oscilloscope
(DC range)
Содержание RCD-W10 - Cd/cdr Recorder/player
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