Specifications

CA10 Course Notes
Sharp Electronics (UK) Limited
CE Technical Support Group Page 41
RGB Switching
Figure 38 : RGB Input and Switching Circuit
It is possible to feed in a RGB signal ( computer, games console, etc. ) to this receiver via the RGB
SCART socket located on the rear of the receiver. Switching for this input is either via direct selection on
the remote control or by automatic switching using the fast switching pin on the socket, pin 16.
D103/4/5/6 prevent IC106 loading any of the input signals should they be present and D810/11/12/13
prevent any large voltage spikes that may appear on the inputs from damaging IC201. R810/11/12/13
are for impedance matching. Note that each signal input is coupled via a 10uF capacitor ( C816/7/8 ) this
is to ensure that the signals do not contain a dc level which may upset the processing stages. The fast
switch input is DC coupled as this will be a voltage level used to switch IC201 to this input.
IC201 internally generates a RGB signal from the incoming video, this RGB signal and that generated by
the RGB socket/teletext IC/on screen display are then switched internally to feed into IC901 to drive the
CRT.