SECTION 4
ELECTRICAL ADJUSTMENTS
Note : Clear RF signal waveform means that the shape O E � can be
CD SECTION
clearly distinguished at the center of the waveform.
Note :RF signal waveform
1. CD Block is basically designed to operate without adjustment.
VOLT/DIV : 200mV
Therefore, check each item in order given.TIME/DIV : 500ns
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M& impedance.
4. Clean the object lens by an applicator with neutral detergent
Level : 1.45 ? 0.3Vp-p
when the signal level is low than specified value with the
following checks.
S-Curve Check
E-F Balance (1 Track jump) Check
OscilloscopeOscilloscope
BD boardBD board
TP(FEO)TP(TEO)
TP(VC)TP(VC)
Procedure :Procedure :
1. Connect oscilloscope to TP (FEO).1. Connect oscilloscope to TP (TEO) and TP (VC).
2. Connect between TP (FEI) and TP (VC) by lead wire.2. Turned ?/1 button on.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.3. Load a disc (YEDS-18) and playback the number five track.
4. Turn ?/1 button on.4. Press the 7 button. (Becomes the 1 track jump mode.)
5. Load a disc (YEDS-18) and actuate the focus search. (In5. Confirm that the level B and A (DC voltage) on the oscilloscope
consequence of open and close the disc tray, actuate the focuswaveform.
search)1 track jump waveform
Center of
6. Confirm that the oscilloscope waveform (S-curve) is
waveform
symmetrical between A and B. And confirm peak to peak level
within 4 ?1 Vp-p.
B
S-curve waveform
SymmetryA (DC voltage)
0 V
ALevel=1.3 ?0.6 Vp-p Symmetry
Wthin 4 ?1Vp-p
A
BSpecified level: � 100 = less than ? 22 %
B
6. After check, remove the lead wire connected in step 1.
7. After check, remove the lead wire connected in step 2 and 3.Adjustment Location:
Note : Y Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.[BD BOARD] (Conductor Side)
Y Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
Oscilloscope
BD board
TP (RF)
TP(RF)
TP (VC)
TP(VC)
Procedure :TP (AGCCON)
1. Connect oscilloscope to TP (RF).
TP (TEO)
2. Connect between TP (AGCCON) and TP (GND) by lead wire.TP (FE0)
3. Turned ?/1 button on. TP IC103
4. Load a disc (YEDS-18) and playback.(GND)
5. Confirm that oscilloscope waveform is clear and check RF signalIC101
level is correct or not.
6. After check, remove the lead wire connected in step 2.
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ACEC
SONY
