Centering Circuit - Mitsubishi Diamond Plus 93SB Service Manual

3.2.7 Centering Circuit

The horizontal raster centering circuit is inserted between the horizontal deflection source circuit and the
horizontal deflection output circuit (H_DY). This circuit is used to assure a current flow of the DC current bias
component in order to shift the deflection current waveform toward the horizontal deflection circuit.
The inflow current is controlled through the adjustment of VR501.
The raster centering circuit uses about 5VDC generated by the rectifier circuit of D507 and C518, using the
power from the secondary winding of T501 in the horizontal deflection source circuit. As a result, a raster
centering correction current is fed from the current circuit that is composed of Q505, R529, R530, VR501,
C519 and L501.
The correction current value is determined by the synthetic impedance (approx. 10Ω) of R530 and L501.
To H_DY of the horizontal deflection circuit
Horizontal deflection raster centering circuit
Horizontal deflection source +B voltage
(Fig. 3.2.7) Centering Circuit
7-12