Mitsubishi Electric 1786FD2 Service Manual page 48

MEA 1786FD2 CRT Monitor Service Guide
Circuit Operation Theory
2. Autosync Deflection Controller (TDA4856)
2.1 pin 1 is AFC feedback .
2.2 pin XRAY: if V XRAY > threshold (6.25V typical) switches the whole IC into protection mode.
2.3 pin 3,4,5,6,8 for B+ control function block.
2.4 pin 11(EWDRV) is a parabolic waveform used for pincushion correction
2.5 pin 16 generates video claming & blanking pulse.
2.6 pin 18,19 is I2C data.
2.7 pin 21 V-regulation.
2.8 the resistor from pin 28 (HREF) to ground determines the maximum oscillator frequency.
2.9 the resistor from pin 27 (HBUF) to pin 28 defines the frequency range.
2.10 pin 31 H-regulation.
2.11 pin 32 focus.
Fig 2 Autosync Deflection Controller Circuit
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