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HCD-V3900/V5900
— 21 —
— 22 —
CD SECTION
Notes:
1. CD block basically constructed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
Ω
impedance.
4. Clean an object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-Curve Check
Connection:
Procedure:
1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board.
2. Connect the TP (FEI) and TP (VC) with lead wire.
3. Turned power switch on.
4. Put disc (YEDS-18) in and turned power switch on again and
actuate the focus search.
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 3.0 ± 1.0 Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure that the ratio of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the brightness
to obtain best waveform.
RF Level Check
Connection:
RF signal waveform
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
E-F Balance (Traverse) Check
Connection:
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VC) on BD board.
2. Turned power switch on.
3. Connect the SL702 and SL703 on the VIDEO board with solder.
4. Put disc (YEDS-18) in and press the
·
button, and play the
number five track.
5. Press the REPEAT button. (The tracking servo and the sledding
servo are turned off.)
6. Confirm that 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
×
100 = less than ±22 %
Traverse waveform
8. After check, remove the soldering installed in step 3.
RF PLL Free-run Frequency Check
Connection:
Procedure:
1. Connect the frequency counter to TP410 (DCLK) on VIDEO
board.
2. Turned power switch on.
3. Press the FUNCTION button to select the CD.
4. Adjust CT401 on the VIDEO board so that the frequency counter
reading 13.5 MHz ± 40 Hz at stop status.
Adjustment Location:
[VIDEO BOARD] (SIDE-B)
Frequency Adjustment
Connection:
VIDEO SECTION
+
–
BD board
TP (FE)
TP (VC)
oscilloscope
A
B
symmetry
within 3.0
±
1.0 Vp-p
+
–
BD board
TP (RF)
TP (VC)
oscilloscope
(AC range)
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
2. Turned power switch on. (stop mode)
3. Put disc (YEDS-18) in and press the
·
button.
4. Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
≈
” can be clearly
distinguished at the center of the waveform.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)
level: 1.3 Vp-p
+0.25
–0.20
+
–
BD board
TP (TE)
TP (VC)
oscilloscope
(DC range)
level: 1.3
±
0.6 Vp-p
Center of the waveform
A (DC voltage)
B
0V
7. Press the REPEAT button. (The tracking servo and the sledding
servo are turned on.) Confirm that the C (DC voltage) is almost
equal to the A (DC voltage) is step 6.
Traverse waveform
C (DC
voltage)
Tracking servo
Sled servo
ON
Tracking servo
Sled servo
OFF
0 V
+
–
TP (PLCK)
BD board
frequency counter
Procedure:
1. Connect the frquency counter to TP (PLCK) on the BD board.
2. Turned power switch on.
3. Put disc (YEDS-18) in and press the
·
button, and play the
number five track.
4. Confirm that the reading on frequency counter is 4.3218 MHz.
Connection Location:
[BD BOARD] (SIDE-A)
IC101
(FEI)
(FE)
(TE)
(VC)
(PLCK)
(RF)
IC103
+
–
TP410 (DCLK)
VIDEO board
frequency counter
TP410
(DCLK)
IC402
CT401
Содержание HCD-V3900
Страница 6: ... 6 This section is extracted from instruction manual ...
Страница 28: ...HCD V3900 V5900 35 36 6 7 SCHEMATIC DIAGRAM CD MOTOR SECTION See page 84 for IC Block Diagrams Page 47 ...
Страница 30: ...HCD V3900 V5900 39 40 6 9 SCHEMATIC DIAGRAM AUDIO SECTION See page 84 for IC Block Diagrams Page 49 Page 49 ...
Страница 42: ...HCD V3900 V5900 63 64 6 21 SCHEMATIC DIAGRAM VIDEO OUT SECTION See page 84 for IC Block Diagrams ...