Mitsubishi Electric WS-48513 Troubleshooting Manual page 44

IR signals from a Mitsubishi Remote are directed to the
RMC input of IC7A00. The signals are filtered, pro-
cessed and directed over the IR-IN-BUSY line to the
SYS-5 µPC on PCB-DTV TUNER. If the SYS-5 cir-
cuitry is busy, it holds the IR-IN-BUSY line Low until it
is clear to receive data.
If it is a Mitsubishi command the SYS-5 µPC directs it
to the DM Module. The signal is processed and routed
back to the TV µPC over the DM-RXD line. If the
commands are for a System 5 component they are di-
rected to the SYS-5 IR Blaster Outputs.
Other manufacturers IR signals are amplified by the Wide
Band Preamp, directed through IC7C50 to the Repeater
IR Blaster Outputs. If IR signals are being output at
that time the IR-OUT-EN line disables IC7C50 until
the current IR output has ended.
4-4