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71
6-7. WAVEFORMS CHECK
This set performs automatic adjustment for each disc, and there-
fore the set need not be adjusted when parts are replaced, but it
requires checking following the description in this section, 6-1.
IC AND FLUORESCENT DISPLAY TUBE CHECK and 6-2.
AUTO CHECK.
For the check, the test mode is used. Wrong setting causes a trouble,
thus requiring extreme care.
fore the set need not be adjusted when parts are replaced, but it
requires checking following the description in this section, 6-1.
IC AND FLUORESCENT DISPLAY TUBE CHECK and 6-2.
AUTO CHECK.
For the check, the test mode is used. Wrong setting causes a trouble,
thus requiring extreme care.
BU Electrical Adjustment Mode
The BU electrical adjustment mode is used to check the S curve
waveform, traverse waveform and RF waveform. After a disc is
placed on the tray, each time the
waveform, traverse waveform and RF waveform. After a disc is
placed on the tray, each time the
[ AMS ]
dial is pressed,
the check mode is switched in order for S curve waveformt
traverse waveformtRF waveform.
traverse waveformtRF waveform.
Setting Method:
After setting the test mode, rotate the
After setting the test mode, rotate the
[ AMS ]
dial to select
“9C BU DENCHO” and press the
[ AMS ]
dial to enter.
“BU MEASURE” will be displayed if the BU electrical adjustment
mode becomes active.
mode becomes active.
S Curve Check
Connection:
Checking Method:
1. After setting the BU electrical adjustment, place the test disc
1. After setting the BU electrical adjustment, place the test disc
(PATD-012 or SATD-S4) on the tray and close the tray, then
press the
press the
[ AMS ]
dial.
2. At the completion of disc type check, “CD DETECT” will be
displayed (for PATD-012 or YEDS-18).
Note:
For the SATD-S4, “SACD DETECT“ is displayed.
3. Press again the
[ AMS ]
dial, and the S curve waveform
check mode will become active and “S-J1 MODE” will be
displayed.
displayed.
4. Connect an oscilloscope to the TP506 (FE) and TP504 (AVC)
on the MAIN board.
5. Check that the level A and B of waveform on the oscilloscope
satisfy the specification.
Specified Value:
Disc
A
B
SATD-04
PATD-012 or
0.7 to 1.7 Vp-p
- 0.1 to +0.1V
YEDS-18
Note:
For easier observation of this waveform, extend the sweep time
and raise the brightness.
and raise the brightness.
Checking and Connecting Location : See page 73.
MAIN board
TP506 (FE)
TP504 (AVC)
+
–
–
oscilloscope
A
B
S curve waveform
VC
Traverse Check
Connection:
Checking Method:
1. Under the condition of S curve waveform check mode in step
1. Under the condition of S curve waveform check mode in step
5, press the
[ AMS ]
dial.
2. After “WAIT” is displayed, the traverse waveform check mode
will become active and “TRAVERSE MODE” will be
displayed.
displayed.
3. Connect an oscilloscope to the TP513 (TE) and TP504 (AVC)
on the MAIN board.
4. Check that the level A and B of waveform on the oscillo-
scope satisfy the specification.
Specified Value:
Disc
A
B
SATD-04
PATD-012 or
0.9 to 1.5 Vp-p
- 0.1 to +0.1V
YEDS-18
Checking and Connecting Location : See page 73.
MAIN board
TP513 (TE)
TP504 (AVC)
+
–
–
oscilloscope
A
B
VC
Center fo the waveform
Traverse waveform
l
L
l
L
l
L
l
L
l
L
l
L
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