Sony CMT-SD1 / CMT-SD3 / HCD-SD1 Service Manual ▷ View online
– 13 –
SECTION 5
TEST MODE
AGING MODE
This unit is equipped with an aging mode.
Use this mode for analyzing defects and for checks after completing repairs.
After repairs, perform aging 100 times and check that the unit is normal.
The aging mode is executed in the following sequence.
The aging mode will continue as long as the unit is normal.
If the unit becomes abnormal, it will display the state and number of cycles, and operations will stop. (Refer to Table 1.)
Use this mode for analyzing defects and for checks after completing repairs.
After repairs, perform aging 100 times and check that the unit is normal.
The aging mode is executed in the following sequence.
The aging mode will continue as long as the unit is normal.
If the unit becomes abnormal, it will display the state and number of cycles, and operations will stop. (Refer to Table 1.)
Sequence of Aging Mode:
CD TOC OK?
NO
YES
OK?
NO
OK?
NO
NO
YES
OK?
OK?
NO
OK?
NO
YES
NO
YES
YES
YES
OK
YES
NG
Start
Sets the CD function and reads the CD TOC.
Message
1
Message
2
Message
3
Message
4
Message
5
Message
6
Message
4
Pauses first song.
Last song search paused state
Starts last song playback
Is CD playing?
End playback?
Opens the CD tray
Closes the CD tray
Power OFF
Display of number of aging cycles
Power ON
Optical defect, spindle defect (including motor), cannot read
Q data, disc defect (scratches, etc.), bad focus, bad GFS, etc.
Disc defect (scratches, etc.), cannot read Q data, etc.
Q data, disc defect (scratches, etc.), bad focus, bad GFS, etc.
Disc defect (scratches, etc.), cannot read Q data, etc.
Optical defect, sled, tracking defect (including motor), cannot
read Q data, disc defect (scratches, etc.).
Optical defect, cannot read Q data, disc defect (scratches, etc.),
etc.
LOAD OUT SW defect
LOAD IN SW defect
read Q data, disc defect (scratches, etc.).
Optical defect, cannot read Q data, disc defect (scratches, etc.),
etc.
LOAD OUT SW defect
LOAD IN SW defect
No
Error Messages
Details of Error
1
2
3
4
5
6
6
CD No Disc NG
CD Pause NG
CD Search NG
CD Play NG
CD Open NG
CD Close NG
CD Close NG
Cannot read CD TOC.
Cannot set CD pause in
CD synchro mode.
Cannot search last track on CD.
CD synchro mode.
Cannot search last track on CD.
Cannot play last track on CD.
Cannot open CD tray.
Cannot close CD tray.
Cannot close CD tray.
Main Causes
Procedure:
1. Press the DISPLAY button and
1. Press the DISPLAY button and
=/TUNING/0 button together.
2. To end aging, press the
u button and end.
Table-1 Messages and Main Reasons for Stop of Aging
– 14 –
Procedure:
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
S Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.
Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
• RF signal
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
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
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with lens cleaning liquid
when the signal level is low than specified value with the fol-
lowing checks.
lowing checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
Perform this adjustment when the optical pick-up has been replaced
or repaired.
or repaired.
–
+
oscilloscope
BD (CD) board
TP (RF)
TP (VC)
TP (VC)
level : 1.3
±
0.3 Vp-p
–
+
oscilloscope
BD (CD) board
TP (FEO)
TP (VC)
TP (VC)
symmetry
A
B
within 2.4
±
0.7 Vp-p
–
+
oscilloscope
BD (CD) board
TP (RF)
TP (VC)
TP (VC)
SECTION 6
ELECTRICAL ADJUSTMENTS
level : 1.3
±
0.3 Vp-p
– 15 –
Procedure :
1. Connect oscilloscpe to test point TP (TEO) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
1. Connect oscilloscpe to test point TP (TEO) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
P (Pause)” button. (Becomes the 1 track jump mode)
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
1 track jump waveform
E-F Balance (1 Track Jump) Check
(Without remote commander)
(Without remote commander)
Specified level: • x 100 = less than ± 7%
• A + B = 300 ± 100 mVp-p
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
A – B
2 (A + B)
Adjustment Location:
[BD (CD) BOARD] — Component Side —
–
+
oscilloscope
BD (CD) board
TP (TEO)
TP (VC)
TP (VC)
A
B
0V
LEVEL : 300
±
100 mVp-p
RF
RV101
(Focus Bias Adjust)
RV103
TEO
VC
FEO
RV102
TEI
FEI
FOK
IC101
IC104
GND
PCK
IC102
– 16 –
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
PANEL-SW board
MAIN board
TRANS board
SUB-TRANS board
BD board
LOADING board
PANEL board
REG board
AMP board
CHEMI-CON board
CONNECTOR board
VOLUME board
HP board
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