CDP-CE275/CE375
Ver 1.1 2001.07
SECTION 5
ELECTRICAL ADJUSTMENTS
Note:Procedure:
1. CD Block is basically designed to operate without adjustment. 1.Set the test disc (PThere-ATD-012). Disc chucking operation is
fore, check each item in order given.complete, then press the [POWER] button to turn the power
2. Use PATD-012 disc (4-225-203-01) unless otherwise indicated.
off.
3. Use an oscilloscope with more than 10M& impedance.
2. Connect an oscilloscope to test point TP (RFDC) and TP (VC)
4. Clean the object lens by an applicator with neutral detergent when the
on the BD board.
signal level is low than specified value with the following checks.
3. Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.
S Curve Check
4. Press the [POWER] button to turn the power on and enter the
Connection:
ADJ mode, then playback the number two track automatically.
oscilloscope
5. Confirm that oscilloscope waveform is clear and check the level
BD boardof between RFDC top and VC is correct or not.
Note:A clear RFDC signal waveform means that the shape E� can beO
TP (FE1)+clearly distinguished at the center of the waveform.
TP (VC)�
RFDC signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
Procedure:
1. Set the test disc (PATD-012). Disc chucking operation is
complete, then press the [POWER] button to turn the power
off.
2. Connect an oscilloscope to test point TP (FE1) and TP (VC)level: 1.15 ? 0.35 Vp-p
on the BD board.
3. Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.
4. Press the [POWER] button to turn the power on and enter the
ADJ mode.VC
Then playback the number two track automaticallyChecking Location: , press theBD board
xbutton to stop the playback.
5. Press the [CHECK] button actuate the focus search. (actuaRFAC Level Chectek
the focus search when disc table is moving in and out)Connection:
6. Check the oscilloscope waveform (S-curve) is symmetrical
oscilloscope
between A and B. And confirm peak to peak level within 2 ? 1
Vp-p.BD board
TP (RFAC)+
S-curve waveform
TP (VC)�
symmetry
Procedure:
A1. Set the test disc (PATD-012). Disc chucking operation is
within 2 ? 1 Vp-pcomplete, then press the [POWER] button to turn the power
off.
B
2. Connect an oscilloscope to test point TP (RFAC) and TP (VC)
on the BD board.
Note: Y Try to measure several times to make sure than the ra3.Connect between test point tio of A : BTP (ADJ) on the MAIN board and
or B : A is more than 10 : 7.GND by lead wire.
Y Take sweep time as long as possible and light up the4. Press the [POWER] button to turn the power on and enter the
brightness to obtain best waveform.
ADJ mode, then playback the number two track automatically.
5. Confirm that oscilloscope waveform is clear and check RFAC
Checking Location: BD board
signal level is correct or not.
Note:A clear RFAC signal waveform means that the shaE� can be pe O
RFDC Level Check
clearly distinguished at the center of the waveform.
Connection:
oscilloscope RFAC signal waveform
VOLT/DIV: 200 mV
BD boardTIME/DIV: 500 ns
TP (RFDC)+
TP (VC)�
level: 1.35 ? 0.4 Vp-p
Checking Location: BD board
13 |
ACEC
SONY
