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LO Gere KiUuE
7) CRT Display Circuit
Circuit Operation:
This circuit is composed as shown below in the circuit diagram. A general description of their functions and
operations is given below.
7-1)
Video amplifier: This amplifies the video signals sent from the signal processor to a level (approx.
40V) which can drive the CRT tube.
7-2)
Vertical oscillator output circuit: This allows a sawtooth wave current corresponding to the vertical
sync signal to pass to the deflection yoke.
7-3)
Horizontal oscillator output circuit: This allows a sawtooth wave current corresponding to the hori
zontal sync signal to pass to the deflection yoke.
7-4)
High-voltage generator circuit: This generates the high voltages required for CRT operation.
7)-1 Video Amplifier
Circuit Operation:
The video signals sent from the signal processor have their voltage amplified to approximately 40V by
the Q352 and Q351 cascade amplifier, after which the signals are supplied to the CRT cathode via R363
configure a circuit which protects the CRT center from shining and the phosphor from burning when the
power is off.
+90 V
HEATER
Fig. 40
7)-2 Vertical Oscillator Output Circuit
Circuit Operation:
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