29
HCD-J300
CD SECTION
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.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RFAC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
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
Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
Load a disc (YEDS-18) and playback the number five track.
button. (Becomes the 1track jump mode.)
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
Specification level:
x
100=less than ±22%
TP(RFAC)
TP(DVC 1.65V)
CD BOARD
oscilloscope
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.1
±
0.3Vp-p
CD BOARD
Oscilloscope
TP(TE)
TP(DVC 1.65V)
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.3
±
0.6Vp-p
A
B
RF PLL Free-run Frequency
Procedure :
1.
Connect frequency counter to TP (XPCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Test Point Location :
[CD BOARD] — SIDE B —
+
–
frequency counter
CD BOARD
TP (XPCK)
TP
(DVC 1.65V)
TP
(TE)
IC101
IC103
TP
(XPCK)
TP
(RFAC)
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