SECTION 4
ELECTRICAL ADJUSTMENTS
Note:
1. CD block is basically designed to operate without adjustment.E-F Balance (Traverse) Check
Therefore, check each item in order given.Connection:
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwiseoscilloscope
(DC range)
indicated.
3. Use the oscilloscope with more than 10 MW impedance.SERVO board
4. Clean an object lens by an applicator with netural detegeent
TP (TE)+
when the signal level is low than specified value with the fol-
TP (VC)�
lowing checks.
S-Curve CheckProcedure:
Connection1. Connect TP (ADJ: CN105 3 pin) on Servo Board to GND,
oscilloscopeand TP3 (TEI: IC105 @? pin) to TP (VC: CN108 2 pin) with
lead wires respectively.
SERVO board
2. Connect on oscilloscope to TP (TE: CN108 1 pin).
TP5 (FE)+3. Turn ON the POWER switch.
TP (VC)�4. Load the disc (YEDS-18) and press á (PLAY) button.
5. Confirm that a waveform on oscilloscope is vertically sym-
Procedure:
metric to A[Vdc], and also its level is proper.
1. Connect an oscilloscope to TP5 (FE:!° pin) on SER IC107 VO
board.
Traverse waveform
2. Connect TP4 (FEI: IC105 @? pin) and TP (VC: CN108 2
pin) on Servo board with a lead wire.
B
3. With the disc (YEDS-18) loaded, turn ON the POWER switch
A
to execute focus searching.0Vdc
4. In such a case, confirm the symmetry and level (p-p value) of
symmetric
the waveform (S-curve) on the oscilloscope.
level: 1.3 ? 0.6 Vp-p
S-curve waveformsymmetric
At this time,´ 100 = ? 22 (%) or less A/B
6. After check, remove the lead wire connected in step 1.
A
within 3.0 ? 1.0 Vp-p
RF PLL Free-run Frequency Check
B
Frequency counter
5. After check, remove the lead wire connected in step 2.SERVO board
Note:Y Try to measure several times to make sure that the ratio
TP (XPLCK)+
of A: B or B: A is more than 10: 7.
�
Y Take sweep time as long as possible and light up the
brightness to obtain best waveform
1. Connect a frequency counter to the TP (XPLCK:1 CN106
RF Level Checkoscilloscope
pin).
Connection:(AC range)
2. Turn ON the POWER switch.
SERVO board3. Load the disc (YEDS-18) and press á (PLAY) button.
Confirm that the frequency at TP (XPLCK) is 4.3218MHz.
TP (RFO)+
TP (VC)�
FOCUS/TRACKING AUTO GAIN DATA SETTING
Procedure:
Refer to 1-1. Writing focus/tracking auto gain data on page 3.
1. Connect an oscilloscope to the TP (RFO:3 pin) CN108
2. Turn ON the POWER switch.
3. Load the disc (YEDS-18), and play the 5th music with á
(PLAY) and AMS Keys.
4. Confirm that a waveform and RF level on the oscilloscope are
proper.
Note:Clear RF signal waveform means thaAt the shape � canO
be clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
+0.25
level: 1.2 �0.20Vp-p
� 14 � |
ACEC
