13
6. Press the
H
button.
7. Check that the waveform on oscilloscope is clear, and the level
and jitter of waveform satisfy the specifications.
8. After checking, press the
x
button.
9. Repeat steps 3 through 8 for respective discs.
10. Press the
!
button to turn the power off.
Specified Value:
Disc
A
Jitter (displayed value)
SATD-S2
1.25 to 1.65 Vp-p
20 (Hex) or less
TCD-784
1.3 to 1.7 Vp-p
15 (Hex) or less
bbb
CD1
Discchk
XX
XX
Disc type (refer to Disc check list (page 11))
6. Press the
-
button and
1
button, the
-
button and
2
but-
ton, and the
-
button and
3
button on the remote commander
successively to execute the focus search.
7. Check that the waveform on oscilloscope is within the level
A
and
B
specifications.
8. After checking, press the
x
button.
9. Repeat steps 3 through 8 for respective discs.
10. Press the
!
button to turn the power off.
Specified Value:
Disc
A
B
SATD-S2
1.5 to 2.3Vp-p
- 0.1 to +0.1V
TCD-784
S Curve Check
Connection:
RF Level Check
Connection:
MAIN board
TP524 (FE)
TP501 (VC)
+
–
oscilloscope
(normal mode)
Procedure:
1. Connect an oscilloscope to the TP524(FE) and TP501(VC) on
the MAIN board.
2. Set the Adjustment-1 Mode. (See 5-2. Adjustment-1 Mode in
SECTION 5 (page 11))
3. Set a disc (SATD-S2 or TCD-784).
4. Press the
3
button and
-
button on the remote commander
to make the disc type checked.
Note:
If the disc check was made in the Adjustment-1 Mode, pressing
another button immediately after pressing the
3
and
-
buttons
on the remote commander could cause the microcomputer to run
out of control, thus requiring extreme care.
5. Confirm that the disc was checked.
A
B
S curve waveform
VC
MAIN board
TP503 (RF)
TP501 (VC)
+
–
oscilloscope
(auto mode)
Procedure:
1. Connect an oscilloscope to the TP503(RF) and TP501(VC) on
the MAIN board.
2. Set the Adjustment-1 Mode. (See 5-2. Adjustment-1 Mode in
SECTION 5 (page 11))
3. Set a disc (SATD-S2 or TCD-784).
4. Press the
3
button and
-
button on the remote commander
to make the disc type checked.
Note:
If the disc check was made in the Adjustment-1 Mode, pressing
another button immediately after pressing the
3
and
-
buttons
on the remote commander could cause the microcomputer to run
out of control, thus requiring extreme care.
5. Confirm that the disc was checked.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF signal waveform
A
bbb
CD1
+ 00
00
~00
09
Jitter value
(HEX)
not fixed
Adjustment Location : See page16.
Adjustment Location : See page16.
bbb
CD1
Discchk
XX
XX
Disc type (refer to Disc check list (page 11))
Note:
For easier observation of this waveform, extend the sweep time
and raise the brightness.
Note:
Clear RF waveform refers to the waveform where
◊
shapes should
be distinctively observed in the center.
Display example:
Содержание SCD-1/777ES
Страница 21: ...21 21 SCD 1 777ES 7 5 SCHEMATIC DIAGRAM LOAD CN LOAD MOT LOAD SW STB Boards Page 29 ...
Страница 27: ...27 27 SCD 1 777ES 7 11 SCHEMATIC DIAGRAM MAIN Board 4 7 Page 26 Page 25 Page 35 Page 32 Page 37 ...
Страница 37: ...37 37 SCD 1 777ES 7 21 SCHEMATIC DIAGRAM DISPLAY SW L SW R Boards See page 40 for Waveforms Page 27 Page 39 ...