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ii
2-3 Power/ stand-by circuit
O Power On/stand-by
The power on/stand-by
signal is output from pin 7 of the CPU.
When the stand-by mode is selected the voltage of pin 7 changes from Hi(5V) to Low(OV)
to turn off Q682. Q682 turning off causes Q683 and Q684 to turn off. +24V supply for ver-
tical and horizontal output circuit, +7.8V supply for lF/Video/Chroma
circuit and +12V for
tuner circuit are all cut off, resulting in the TV set going into the stand-by mode.
When the TV is switched back into the power on mode, Q683 and Q684 are turned on
and the relevant voltages are supplied back to each circuit.
, -.,-.,-.,-.
. . . ..
Q683
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supply
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R681
15k
7
AAA
7
5v --------
Power On
t
""sEd'by-""-"'"o'
~
Q682
CPU
-1o-
Traming
Manual
AC I Chassis
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