CMT-DC500MD, HCD-J300 - Sony Audio Service Manual (repair manual). Page 29

Read Sony CMT-DC500MD / HCD-J300 Service Manual online

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
 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
Procedure:
1.
Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
2.
Turned Power switch 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)
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)
Page of 93
Display

Click on the first or last page to see other CMT-DC500MD / HCD-J300 service manuals if exist.