High Voltage Circuit
Figure 31
The High Voltage module is an integrated High Voltage supply with its own switching power supply.
When the set is turned On, 11.5 volts from the Sweep Failure detection circuit is fed to diode 6913
and to Pin 8 of the High Voltage module. A supply voltage of 130-volts is also fed to Pin 10 of the
module. The Module then outputs High voltage to the three CRTs. It also outputs Focus voltage to the
Focus G2 block. Output on Pin 4 is rectified by 6917 to produce a negative 200-volt source for the
CRT G1 voltage. The voltage is also rectified by 6919 to produce a 375-volt source for the Dynamic
Focus drive. The Dag line along with the output on Pin 2 is connected to 7903 to produce the ABL
voltage for the set. If an overcurrent condition should develop with the drive, the ABL voltage will go
Low, turning 7905 On, latching 7904, which will remove drive to Pin 8 of the HVG. This will cause the
High voltage to shut Off. Vertical Parabola drive is fed to 7901 to produce the Vertical component of
the Dynamic Focus drive.