Sony HCD-MD1DX / HCD-MD1EX (serv.man2) Service Manual ▷ View online
– 29 –
6-9.
ERROR RATE CHECK
6-9-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Press the
1. Load a check disc (MD) TDYS-1.
2. Press the
[VOLUME+/–]
button to display “CPLAY MODE”.
3. Press the
p (CD) button to display “CPLAY MID”.
4. “C =
AD =
” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the
6. Press the
^ (CD) button to stop playback. Then press the
6 (MD) button, and remove the check disc (MD).
6-9-2. MO Error Rate Checking
Checking Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the
1. Load a continuously recorded disc (Refer to 6-4. Creating the
Continuously Recorded Disc”).
2. Press the
[VOLUME+/–]
button to display “CPLAY MODE”.
3. Press the
p (CD) button to display “CPLAY MID”.
4. “C =
AD =
” is displayed.
5. Check that the C1 error rate is below 50 and ADER is 00.
6. Press the
6. Press the
^ (CD) button to stop playback. Then press the
6 (MD) button, and remove the disc.
6-10. FOCUS BIAS CHECK
Change the focus bias value and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the
1. Load a continuously recorded disc (Refer to 6-4. Creating the
Continuously Recorded Disc”).
2. Press the
[VOLUME+/–]
button to display “CPLAY MODE”.
3. Press the
p (CD) button to display “CPLAY MID”.
4. When “C =
AD =
” is displayed, press the
^ (CD)
button.
5. Press the
[VOLUME+/–]
button to display “FBIAS CHECK”.
6. Press the
p (CD) button to display “
/
c =
”.
The first four digits indicate the C1 error, the two digits after
the “/” indicate ADER and the two digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 50 and ADER is 00.
the “/” indicate ADER and the two digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the
p (CD) button to change the display to “
/
b
=
”.
Check that the C1 error does not drop below about 200 and
ADER does not remain above 00.
ADER does not remain above 00.
8. Press the
p (CD) button to change the display to “
/
a
=
”.
Check that the C1 error does not drop below about 200 and
ADER does not remain above 00.
ADER does not remain above 00.
9. Press the
^ (CD) button, press the 6 (MD) button next,
and remove the continuously recorded disc.
Note 1:
If the C1 error is above about 200 or ADER is above 00 only for
point a (step 8 above) and point b (step 7 above), the focus bias
may not adjusted properly. In this case, adjust again.
point a (step 8 above) and point b (step 7 above), the focus bias
may not adjusted properly. In this case, adjust again.
– 30 –
6-11. ADJUSTING POINTS AND CONNECTING POINTS
[BD (MD) Board] (Side A)
D101
IC192
IC171
IC101
Q102
IC121
IC316
Q163
TP (IOP)
TP1003
(VC)
(VC)
TP69
(TEO)
(TEO)
TP (I + 3V)
[BD (MD) Board] (Side B)
– 31 –
Procedure:
1. Connect oscilloscope to test point TP (RF).
2. Turn 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. Turn 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.)
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
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
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.
0.7 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 brightness to
obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD (CD) board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF
1. Connect oscilloscope to test point TP (RF) on BD (CD) board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in 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.
distinguished at the center of the waveform.
RF signal waveform
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 10 M
3. Use an oscilloscope with more than 10 M
Ω
impedance.
4. Clean the object lens by an applicator with lens cleaning liq-
uid when the signal level is low than specified value with the
following checks.
following 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 re-
placed or repaired.
placed 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)
level : 1.3
±
0.3 Vp-p
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
– 32 –
Procedure :
1. Connect oscilloscpe to test point TP (TEO) on BD (CD) 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 (CD) board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
^ (CD) (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
6. Remove the lead wire connected in step 1.
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] (Side B)
–
+
oscilloscope
BD (CD) board
TP (TEO)
TP (VC)
TP (VC)
A
B
0V
LEVEL : 300
±
100 mVp-p
RF
RV101
(Focus Bias
Adjustment)
Adjustment)
(Focus/Tracking Gain Adjustment)
RV103
TEO
VC
FEO
RV102
TEI
FEI
FOK
IC101
IC104
GND
PCK
IC102
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