Amplifier/Summing Circuitry; Convergence Output Amplifiers - Mitsubishi Electric VS-45605 Technical Training Manual

of the analog signals, and directs them to
Amplifier/Summing circuits located in the
second stage of the same ICs.

Amplifier/Summing Circuitry

Figure 4-4 illustrates the Horizontal Cor-
rection Amplifier/Summing circuitry. The
Vertical Correction circuitry is the same
except for component notation. The Am-
plifier/Summing circuitry is within the sec-
ond stage of the ICs used in the LPF.
Referring to Figure 4-4, there is an ampli-
fier for each color, red, green and blue.
The Green Horizontal Correction signal
is applied to all three amplifiers. Resistor
R867 directs Green signal to the Red Am-
plifier Input, at pin 2 of IC806, and R872
supplies Green signal to the Blue Ampli-
fier input, at pin 2 of IC807.
All three amplifiers are stabilized by feed-
back to their non-inverting input. The am-
plified correction signals are directed to
their respective Convergence Output Am-
plifiers on the PCB-CONV.

Convergence Output Amplifiers

Figure 4-5 shows the circuitry for the Horizontal Cor-
rection Output Amplifiers. All three of the amplifi-
ers are in IC8C01. The amplified outputs are di-
rected to their respective horizontal sub yoke coil
winding.
For stabilization, feedback from the return end of
each sub coil, is direct to the inverting input of its'
amplifier.
The plus, and minus 24 Volts supplies furnish power
for IC8C01. +24 Volts is applied to pins 5 and 10,
and -24 Volts to pins 4, 8, 12, and 17.
NOTES: __________________________________________________________________________
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Q8C01, at pin 3, momentarily disables the IC when
the TV is switched ON. As the negative 24 Volt
supply is generated, the voltage at the base of Q8C01
is delayed while C8C12 charges through R8C06.
During the charging period, Q8C01 conducts, ap-
plying negative voltage the Mute input at pin 3, dis-
abling the IC.
When C8C12 has charged, Q8C01 turns OFF and
the IC is enabled. Both 24 Volt supplies are scan
derived from the Horizontal Output Circuitry. The
momentary disabling of the Convergence Output ICs,
reduces the load on the Horizontal Output stage.
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