Mitsubishi Electronics WS-65513, WS-48613, WS-48513, WS-55513 manual Chapter Convergence Circuitry

Chapter 7

Convergence Circuitry

Figure 7-1: Convergence Circuitry - Overall Block Diagram

The Overall Block Diagram in Figure 7-1shows the the V23 Convergence Circuitry.. A Waveform Gen- erator generates the convergence correction signals timed from horizontal and vertical sync pulses. The correction signals from the Waveform Generator are in a serial digital format.

The following Digital/Analog Converter changes the digital signals to analog signals. The analog signals from the D/A Converter are directed LPF (Low Pass Filter) and Summing Amplifiers. Any remaining high frequency digital signals are removed and the analog correction signals are amplified. Green cor- rection signals are added to the red and blue signals in the Amplifiers, hence the name Summing Ampli- fiers.

The correction signals are amplified by Output Am- plifiers and are directed to the sub coils in their re- spective Deflection Yokes.

This is the same basic circuitry used in the last few chassis types. There are only two major differences in V23 Convergence circuitry compared to that in the V21.

1)In the V23, the Waveform Generator is on the PCB-SIGNAL, not on a separate plug-in PCB.

2)Two Convergence Output ICs are used in the V23, only one was used in the V19.

7-1