Sony CDP-557ESD - Focus Bias Adjustment; E-F Balance Adjustment

CDP-557ESD/707ESD
Focus Bias Adjustment E-F Balance Adjustment
This adjustment should be made when replacing This adjustment should be made when replacing
Optical Pick-up. Optical Pick-up.
Procedure: Procedure:
oscilloscope . Connect oscilloscope to test points TE and GND.
(DC range) : :
. Put set into adjustment mode. (See page 7.)
digital board . Turn POWER switch on.
(mac EN.
TP (RF) . Put disc (YEDS-18) in and press ® button.
TP (GND) ¢ | 0 . Adjust RV101 so that the traverse waveform is
symmetrical above and below.
_ Connect oscilloscope to test points RF and GND. . After adjustment, cancel the adjustment mode.
(See page 7.)
. Put set into adjustment mode. (See page 7.)
. Turn POWER switch on.
. Put disc (YEDS-18) in and press > button.
. Adjust RV104 for an optimum waveform eye pat-
tern or so that the peak is maximum. Optimum
eye pattern means that shape “©” can be clearly VOLT/DIV: 1V
ae ; TIME/DIV: ims
distinguished at the center of the waveform. :
Adjustment Location: digital board
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Adjustment Location: digital board
TP (GND) TP (RF)