Sony MDX-C800REC (serv.man3) Service Manual ▷ View online
5
Mode No.
(Focus Bias Adj.)
(Focus Bias Adj.)
Represents the
point B measurement
point B measurement
Indicates the C1 error rate
Mode No.
(Focus Bias Adj.)
(Focus Bias Adj.)
Represent the
point A measurement
point A measurement
Indicates the C1 error rate
Mode No.
(EF-B Adj.)
(EF-B Adj.)
Represents
EF adjustment
EF adjustment
Initial set value Value after
automatic
adjustment
adjustment
TRAVERSE ADJUSTMENT
Connection:
Procedure:
1. Connect an oscilloscope between TP (TE) and TP (VC).
2. Set the test mode. (See page 2.)
3. Insert the test disc TDYS-1 and press 5 key.
4. Press 3 key.
1. Connect an oscilloscope between TP (TE) and TP (VC).
2. Set the test mode. (See page 2.)
3. Insert the test disc TDYS-1 and press 5 key.
4. Press 3 key.
LCD display
5. The traverse is automatically adjusted. Verify that the waveform
of the oscilloscope meets the specified value.
6. If outside the specified value, use DISC + or DISC – to adjust
the waveform.
Pressing of DISC + or DISC – will cause the value after
automatic adjustment to be varied.
Pressing of DISC + or DISC – will cause the value after
automatic adjustment to be varied.
7. Press + > M key for 2 seconds to save the data set in steps
5 and 6.
After saving the data, verify that the initial set value is equal to
the value after automatic adjustment.
After saving the data, verify that the initial set value is equal to
the value after automatic adjustment.
8. Press 3 key. The traverse adjustment is completed.
+
–
–
oscilloscope
V: 0.5 V/div H: 10 ms/div
Input: DC mode
Input: DC mode
MD servo board
TP (TE)
TP (VC)
A
B
VC
(Traverse waveform)
Specification: A = B
FOCUS BIAS ADJUSTMENT
Procedure:
1. Set the test mode. (See page 2.)
2. Insert the continuously recorded disc (see page 3.) and press 5
1. Set the test mode. (See page 2.)
2. Insert the continuously recorded disc (see page 3.) and press 5
key.
3. Press 4 key and check the error rate in the current focus bias
setting.
LCD display
<Setting the focus bias point A>
4. Verify that the first digit of the C1 error rate are “0”. Then,
4. Verify that the first digit of the C1 error rate are “0”. Then,
press 4 key.
LCD display
5. Press DISC + key until the C1 error rate value reaches “1.00”
(Note 1).
6. Press + > M key for 2 seconds to save the data set in step
5.
<Setting the focus bias point B>
7. Press 4 key.
7. Press 4 key.
LCD display
8. Press DISC – key until the C1 error rate value reaches “1.00”
(Note 1).
9. Press + > M key for 2 seconds to save the data set in step
8.
10. Press 4 key.
LCD display
Mode No.
(Focus Bias Adj.)
(Focus Bias Adj.)
Represents the
initial measurement
initial measurement
Indicates the
C1 error rate
C1 error rate
Mode No.
(Focus Bias Adj.)
(Focus Bias Adj.)
Represents the
calculated
point C measurement
calculated
point C measurement
Indicates the C1 error rate
6
11. Verify that the calculated point C error rate is “0.30” or less.
If more than “0.30”, adjust again from step 1.
12. Press 4 key. The focus bias adjustment is completed.
Note 1) Since the C1 error rate varies, the average should be read to
perform this adjustment.
Note 2) The relationship between C1 error rate and focus bias amount
is shown in the figure below.
Find out the points A and B in the above adjustment. The
total focus point C is automatically calculated from the
points A and B.
Find out the points A and B in the above adjustment. The
total focus point C is automatically calculated from the
points A and B.
CD ERROR RATE CHECK
Procedure:
1. Set the test mode. (See page 2.)
2. Insert the test disc TDYS-1 and press 5 key.
3. Press 6 key to set the PLAY mode.
1. Set the test mode. (See page 2.)
2. Insert the test disc TDYS-1 and press 5 key.
3. Press 6 key to set the PLAY mode.
(Verify that the “SHUF1” indication is lit on the display.)
4. Verify that no number is displayed at the disc No. indicator.
If any number is displayed, repeatedly press DSPL key until
the number disappears (only two digits are displayed).
the number disappears (only two digits are displayed).
5. Press ENTER key and verify that the disc No. indicator shows
“3”.
If “7” is shown or there is no display, repeatedly press ENTER
key until “3” is displayed.
If “7” is shown or there is no display, repeatedly press ENTER
key until “3” is displayed.
LCD display
6. Verify that the C1 error rate is “0.30” or less.
7. Press 5 key. The CD error rate check is completed.
7. Press 5 key. The CD error rate check is completed.
MO ERROR RATE CHECK
Procedure:
1. Set the test mode. (See page 2.)
2. Insert the continuously recorded disc (see page 3.) and press 5
1. Set the test mode. (See page 2.)
2. Insert the continuously recorded disc (see page 3.) and press 5
key.
3. Press 6 key to set the PLAY mode.
(Verify that the “SHUF1” indication is lit on the display.)
4. Verify that no number is displayed at the disc No. indicator.
If any number is displayed, repeatedly press DSPL key until
the number disappears (only two digits are displayed).
the number disappears (only two digits are displayed).
5. Press ENTER key and verify that the disc No. indicator shows
“3”.
If “7” is shown or there is no display, repeatedly press ENTER
key until “3” is displayed.
If “7” is shown or there is no display, repeatedly press ENTER
key until “3” is displayed.
LCD display
6. Verify that the C1 error rate is “0.30” or less.
7. Press 5 key. The MO error rate check is completed.
7. Press 5 key. The MO error rate check is completed.
100
B
C
A
C1 error rate
Focus bias amount
(F. BIAS)
(F. BIAS)
SHUF 1
Disc No. indicator
C1 error rate
PLAY mode
SHUF 1
Disc No. indicator
C1 error rate
PLAY mode
7
I+3V
IOP
VC
TE
Measurement points:
— MD SERVO BOARD (SIDE A) —
8
MDX-C800REC
Sony Corporation
Audio Entertainment Group
9-870-144-81
2000F0455-1
Printed in Japan ©2000. 6
Published by ME General Engineering Dept.
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