Read Sony CMT-C7NT / HCD-C7NT Service Manual online
43
HCD-C7NT
14. ERROR RATE CHECK
14-1. CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the .
1. Load the check disc (TDYS-1).
2. Press the .
“R”
or >
“R”
button and display “CPLAY 2
MODE” (C36).
3. Press the
ENTER/YES “R”
button and display “CPLAY 2
MID”.
4. The display changes to “C = AD = )”.
5. Check that the C1 error rate is below 20.
6. Press the
5. Check that the C1 error rate is below 20.
6. Press the
MENU/NO “R”
button to stop playback, then press
the
MD
Z button and take out the check disc.
14-2. MO Error Rate Check
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING THE
1. Load the continuously-recorded disc. (Refer to “5. USING THE
CONTINUOUSLY RECORDED DISC” (See page 37))
2. Press the .
“R”
or >
“R”
button to display “CPLAY 2
MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY 2MID”.
4. The display changes to “C1 = AD = )”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
MENU/NO “R”
button to stop playback, then press
the
MD
Z button and take out the disc.
15. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 37))
2. Press the .
“R”
or >
“R”
button to display “CPLAY 2
MODE” (C36).
3. Press the
ENTER/YES “R”
button twice to display “CPLAY
2 MID”.
4. Press the
MENU/NO “R”
button when “C1 = AD =
)” is displayed.
5. Press the .
“R”
or >
“R”
button to display “FBIAS
CHECK” (C16).
6. Press the
ENTER/YES “R”
button to display “ / c =
”.
The first four digits indicate the C1 error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
after “/ ” indicate ADER, and the 2 digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7. Press the
ENTER/YES “R”
button and display “ / b
= ”.
Check that the C1 error is about 100 and ADER is below 2.
Check that the C1 error is about 100 and ADER is below 2.
8. Press the
ENTER/YES “R”
button and display “ / a
= ”.
Check that the C1 error is about 100 and ADER is below 2
Check that the C1 error is about 100 and ADER is below 2
9. Press the
MENU/NO “R”
button, then press the
MD
Z button
and take out the disc.
Note:
If the C1 error and ADER are above other than the specified
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust from the beginning again.
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust from the beginning again.
C1 error
about
220
220
B
C
A
Focus bias value
13. FOCUS BIAS ADJUSTMENT
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 37))
2. Press the .
“R”
or >
“R”
button to display “CPLAY 2
MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY 2MID”.
4. Press the
MENU/NO “R”
button when “C = = ” is
displayed.
5. Press the .
“R”
or >
“R”
button to display “FBIAS
ADJUST” (C09).
6. Press the
ENTER/YES “R”
button to display “ / a =
T”.
The first four digits indicate the C1 error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “a =” indicate
the focus bias value.
after “/ ” indicate ADER, and the 2 digits after “a =” indicate
the focus bias value.
7. Press the >
“R”
button and find the focus bias value at
which the C1 error rate becomes about 220 (refer to Note 2).
8. Press the
ENTER/YES “R”
button to display “ / b =
T”.
9. Press the .
“R”
button and find the focus bias value at
which the C1 error rate becomes about 220.
10. Press the
ENTER/YES “R”
button to display “ / c =
T”.
11. Check that the C1 error rate is below 20 and ADER is 00. Then
press the
ENTER/YES “R”
button.
12. If the “( )” in “ - - ( )” is above 20, press the
ENTER/YES “R”
button.
If below 20, press the
MENU/NO “R”
button and repeat the
adjustment from step 2.
13. Press thet
MD
Z button and take out the disc.
Note 1:
The relation between the C1 error and focus bias is as shown in
the following figure. Find points A and B in the following figure
using the above adjustment. The focal point position C is auto-
matically calculated from points A and B.
the following figure. Find points A and B in the following figure
using the above adjustment. The focal point position C is auto-
matically calculated from points A and B.
Note 2:
As the C1 error rate changes, perform the adjustment using the
average value.
average value.
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