Sony UP895 Service Manual - Page 23
Electrical Alignment, 3-1. AGC Adjustment, 3-2. Video Level Adjustment
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Section 3 Electrical Alignment [Equipment Required] . Oscilloscope . Digital voltmeter . 10 steps signal generator Tektronix 1410 or equivalents (For NTSC signal) Tektronix 1411 or equivalents (For PAL signal) 3-1. AGC Adjustment Machine condition for adjustment . Input signal: 10 steps signal . No monitor is connected. . Set rear panel DIP switch 9 to up. (AGC-ON) Specification TP5 (AMP IN)/MA-99 (C-3) Output waveform Vs Adjustments AGC REF adjustment 1RV3/MA-99 (C-2) AGC GAIN adjustment 1RV2/MA-99 (C-2) MA-99 Procedure 1. Input a 10 steps signal and set DIP switch != to DOWN. Adjust RV3 (AGC REF) so that Vs is 700 mV. 2. Set DIP switch != to UP and adjust RV2 (AGC GAIN) so that Vs is 630 mV. . Adjust so that Vs is 700 mV when AGC is ON and 75 Z terminator is on. . Adjust so that Vs is 630 mV when AGC is ON and 75 Z terminator is off. 1RV3 1RV2 TP5 3-2. Video Level Adjustment Machine condition for adjustment Specification . Input signal: 10 steps signal . In case, monitor is not connected, set DIP switch != on the rear panel to ON, if connected, set to OFF. . Adjust RV4 (AGC OFF CONT) using 10 steps signal input. TP5 (AMP IN)/MA-99 (C-3) Output waveform 1.0 V Adjustments AGC OFF CONT adjustment 1RV4/MA-99 (C-2) MA-99 Adjust so that video signal level is 1.0 V. 1RV4 TP5 UP-895/(E) 3-1
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