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6-4 G2 CONTROL CIRCUIT SECTION
G2 control circuit complements operations of auto bias circuit and when replacing CRT, it is
not necessary to adjust screen voltage. For circuit operations, R. G. B cathode voltage of
CRT is detected through R936, R931 and R933. When the voltage is applied to Q904 base,
Q904 automatically controls screen voltage to maintain screen brightness at a constant
level.
6-5 AUTO BIAS CIRCUIT SECTION
Auto bias circuit automatically controls BIAS voltage by detecting the separation between
cathode of CRT and grid 1, and compensates for color changes in warm-up to maintain
them constantly. Also, when using CRT for a long period, the circuit lengthens life of CRT
by compensating for deterioration of emission and helps to replace CRT without any other
adjustment in A/S. SUB PCB Pin 4 is connected to cathode of CRT.
KT-XX03NA
KORTEK Corporation
