28
HCD-M10
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 10MΩ 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. Turn the power 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
Procedure:
1. Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the u button. (Becomes the 1track jump mode.)
5. 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
B=1.3
±
0.6Vp-p
Record Level Check
Procedure:
1. Press FUNCTION button to select ANALOG IN.
2. Insert a tape into deck, press the z TAPE button, and then press
the X TAPE button to start recording.
3. Mode: Record
4. Mode: Playback
5. The playback output level should be –2 ±4 dBs (60 Hz),
–1 ±4 dBs (8 kHz) and –3 ±4 dBs (10 kHz) compared with 315Hz
playback level.
AF OSC
PJ301
ANALOG IN
1) 315 Hz
2) 60 Hz
3) 5 kHz
4) 10 kHz
blank tap
CS-123
set
attenuator
600
Ω
109 mV (–17 dB)
recorded
position
level meter
set
32
Ω
J301
PHONES
1.3±0.6Vp-p
A
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