Philips PTV800, Service Manual

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corrections signals for red, green, and blue horizontal and vertical. The dac outputs are
approximately 2 volts peak to peak with a 2.5 volt dc offset. The CSP also supplies a 375 KHz
5 volt peak to peak WS or word select signal to select the proper channel on the dac for
horizontal or vertical.
If for some reason the set needs to be converged in the field, the CSP generates a crosshatch
pattern with an intensified cross. Control for IC13 is done by the microcomputer on the Small
Signal Panel. The R, G, B, Fast Blanking, and intensity signals used to display the pattern, are
output on pins 29, 30, 31, 25, and 26 of IC13.
The convergence correction waveforms may be disabled for set up procedures by shorting the
set up connector TP4.
The output of the dac's are amplified by and filtered by IC100, IC200, and IC300 before being
fed to the Yoke drive amplifiers.