Mitsubishi Electric HITACHI VS-50111 Troubleshooting Manual page 49

is directed to the HV Regulation circuitry. DF (Dy-
namic Focus) is a parabolic signal used by the DBF
(Dynamic Beam Focus Circuitry).
LPF & Summing Amps
Figure 2 illustrates the LPF and Summing Amplifi-
ers. The circuitry consists of three ICs, IC8E00,
IC8E01 and IC8E02. Each correction signal from
IC8D00 goes through two stages of amplification:
1) The first stage is part of the LPF.
2) The second stage is the Summing Amplifier.
Green horizontal and vertical correction signals are
added to the Red and Blue Summing Amplifier in-
puts.
7-3
V20 Chassis Technical Training
and Troubleshooting Guide