– 18 –
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
S Curve Check
Procedure :
1. Connect the oscilloscope to test points TP (FE) and TP (VC).
2. Connect TP (FEI) and GND, and TP (AGCCON) and GND of
the BD board with lead wires.
3. Press the
1
/
u
button to turn the set ON.
4. With the disc (YEDS-18) loaded, press the
·P
button and
perform focus search. (Focus search will be performed in the
same way even while the disc table is pushed in and out.)
5. Check the symmetry and peak to peak level of the oscilloscope
waveform (S curve) at this time.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD
board.
2. Connect TP (AGCCON) and GND of the BD board with lead
wires.
3. Press the
1
/
u
button to turn the set ON.
4. Put disc (YEDS-18) in and playback 5 track.
5. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
6. After check, remove the lead wire connected in step 2.
Adjustment Location :
[ BD BOARD ] — SIDE A —
Procedure:
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Press the
1
/
u
button to turn the unit ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the
·P
button.
5. Check the level B of the oscilloscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following:
• A/B x 100 = less then ± 22 (%)
• B = 1.3 ± 0.6 Vp-p
1 track jump waveform
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (FE)
TP (VC)
+
–
symmetry
A
B
Within 4
±
1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
+
–
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45
±
0.25 Vp-p
0V
Center of the waveform
B
Symmetry
A (DC voitage)
level : 1.3
±
0.6 Vp-p
oscilloscope
BD board
TP (TE)
TP (VC)
+
–
TP
(VC)
TP
(RF)
TP
(TE)
TP
(FE1)
TP (FE)
TP
(AGCCON)
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
Содержание SS-XB800AV
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Страница 37: ...HCD DR7AV XB800AV 53 54 7 11 SCHEMATIC DIAGRAM DECK SECTION Page 49 ...
Страница 38: ...HCD DR7AV XB800AV 55 56 7 12 PRINTED WIRING BOARD DECK SECTION See page 19 for Circuit Boards Location Page 41 ...
Страница 47: ...HCD DR7AV XB800AV 73 74 7 21 SCHEMATIC DIAGRAM PANEL VR SECTION See page 103 for IC Block Diagrams Page 70 ...
Страница 49: ...HCD DR7AV XB800AV 77 78 7 23 SCHEMATIC DIAGRAM TC PANEL SECTION Page 70 Page 70 Page 82 Page 81 82 Page 69 ...
Страница 51: ...HCD DR7AV XB800AV 81 82 7 25 SCHEMATIC DIAGRAM CD PANEL SECTION Page 78 Page 43 Page 77 78 ...
Страница 53: ...HCD DR7AV XB800AV 85 86 7 27 SCHEMATIC DIAGRAM CD MOTOR SECTION Page 48 ...
Страница 55: ...HCD DR7AV XB800AV 89 90 7 29 SCHEMATIC DIAGRAM JACK SECTION Page 57 65 Page 52 ...
Страница 57: ...HCD DR7AV XB800AV 93 94 7 31 SCHEMATIC DIAGRAM TRANS SECTION XB800AV model Page 65 Page 67 ...
Страница 59: ...HCD DR7AV XB800AV 97 98 7 33 SCHEMATIC DIAGRAM TRANS SECTION DR7AV model Page 57 ...
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