Specifications

CA10 Course Notes
Sharp Electronics (UK) Limited
CE Technical Support GroupPage 40
Signal sources and switching
Video signals can either be obtained from the tuner ( RF channels from 20 to 69 ), front AV, rear S-VHS
or the two SCART sockets located on the rear of the receiver - one of these is designated RGB. RGB
signals also come from the teletext processor for text and for the on screen display, these are discussed
further in the Teletext , RGB switching and On screen display sections of these notes. All these inputs
are fed into IC201 ( see table below ), which switches to the required source under instruction from the
main system microprocessor, IC101.
Source Pin of Source Pin of IC401 Pin of IC201
RGB Video 20 17 10
RGB 7/11/15 - 23/24/25
Tuner/IF Pin 6 of IC201 - 13
Front AV - 12 11
Teletext IC106 8/9/10 - 23/24/25
OSD IC106 8/9/10 - 23/24/25
SCART Y 20 13 11
SCART C 15 1 10
When the receiver is switched to the S-VHS input, it will select the rear AV SCART socket on pins 20 for
luminance and 15 for chrominance and connects these to pins 11 and 10 of IC201 respectively.