Sony SCD-1/777ES Service Manual page 13

S Curve Check
Connection:
MAIN board
TP524 (FE)
TP501 (VC)
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.
bbb
CD1
Discchk 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
9. Repeat steps 3 through 8 for respective discs.
10. Press the ! button to turn the power off.
Specified Value:
Disc
SATD-S2
1.5 to 2.3Vp-p
TCD-784
S curve waveform
VC
Note: For easier observation of this waveform, extend the sweep time
and raise the brightness.
Adjustment Location : See page16.
oscilloscope
(normal mode)
+
–
XX
x button.
A B
- 0.1 to +0.1V
A
B
RF Level Check
Connection:
MAIN board
TP503 (RF)
TP501 (VC)
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.
bbb
CD1
Discchk XX
Disc type (refer to Disc check list (page 11))
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
9. Repeat steps 3 through 8 for respective discs.
10. Press the button to turn the power off.
!
Specified Value:
Disc
A
SATD-S2 1.25 to 1.65 Vp-p
TCD-784 1.3 to 1.7 Vp-p
RF signal waveform
Note: Clear RF waveform refers to the waveform where ◊ shapes should
be distinctively observed in the center.
Display example:
bbb
CD1
+ 00 00 ~00 09
not fixed
Jitter value
(HEX)
Adjustment Location : See page16.
oscilloscope
(auto mode)
+
–
XX
button.
x
Jitter (displayed value)
20 (Hex) or less
15 (Hex) or less
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
A
13