Traverse Adjustment; Focus Bias Adjustment - Sony MDX-C800REC Service Manual Supplement

TRAVERSE ADJUSTMENT

Connection:
MD servo board
TP (TE)
TP (VC)
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.
LCD display
Mode No. Represents
(EF-B Adj.) EF adjustment
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.
(Traverse waveform)
VC
Specification: A = B
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.
8. Press 3 key. The traverse adjustment is completed.
oscilloscope
+
–
V: 0.5 V/div H: 10 ms/div
Input: DC mode
Initial set value Value after
automatic
adjustment
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
key.
3. Press 4 key and check the error rate in the current focus bias
setting.
LCD display
Mode No. Represents the
(Focus Bias Adj.) initial measurement
<Setting the focus bias point A>
4. Verify that the first digit of the C1 error rate are "0". Then,
press 4 key.
LCD display
Mode No. Represent the
(Focus Bias Adj.) point A measurement
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.
LCD display
Mode No. Represents the
(Focus Bias Adj.) point B measurement
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. Represents the
(Focus Bias Adj.) calculated
point C measurement
Indicates the
C1 error rate
Indicates the C1 error rate
Indicates the C1 error rate
Indicates the C1 error rate
5