Specifications

CA10 Course Notes
Sharp Electronics (UK) Limited
CE Technical Support Group Page 37
Note that SRS is provided on some models ( 51DS05H, 59DS05H and 66DS05H ) and this system is
described in more detail in the Sound Retrieval System ( SRS ) section of these notes.
Signal sources and generation
Audio signals come from four different sources, which are listed in the table below. Note that the IF input
from the tuner is decoded within IC305 to produce the normal FM mono and stereo NICAM signals.
Signal Left Source Pin Right Source Pin IC305 Left Input IC305 Right Input
Source
SCART 6 2 Pin 49, SC2 IN L Pin 50, SC2 IN R
RGB 6 2 Pin 52, SC1 IN L Pin 53, SC1 IN R
Front AV Front AV sockets Pin 46, SC3 IN L Pin 47, SC3 IN R
Tuner ( IF ) Pin 6 of IC201 ( Video Out ) Pin 58, ANA IN1+
RF audio signals are processed from the incoming sound IF signal on pin 58 of IC305. As can be seen
from the IF signals section of these notes the incoming IF signal is split two ways, one goes to the video
demodulator, the other to the sound stages. Once inside the IC, demodulation takes place of both the FM
( mono ) and NICAM ( stereo ) signals. Other signals come from the AV SCART, RGB SCART and front
AV connectors. These are switched within the IC.
Signal switching
All audio signal switching is carried out within IC305 under control from the I C bus 2 line. The switching
2
options are controlled from the video selection menu via the remote control or my direct switching by the
SCART sockets.
Loudspeakers driver stage
Sound amplification and output is achieved by a discrete component output stage which is similar to that
of the frame output stage ( class D ). This stage will be used in the first production of the CA10 chassis,
however later chassis may be fitted with a single chip. No circuit description of this process will be given
as at the time of preparing these notes, no final decision has be received from the factory.
Note that on this receiver there are three loudspeaker channels - left, right and sub-woofer.