DSC-F1 (serv.man2) - Sony Digital Camera Service Manual (repair manual). Page 35

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When the WIRELESS setting is set to OFF at the PLAY menu, the IrDA circuit cannot be used.
(IrDA communication cannot be performed with the PC.)
However, when executing print/transfer, the IrDA circuit can be used even if the WIRELESS setting is OFF.

The compressed image data read from the image memory (IC771) is output from the main microprocessor (IC602) to the

buffer (IC701). In the buffer, the 3V microprocessor output signal is converted to 5V, and output to the IrDA interface
(IC706).

Likewise, control signals such as XIRSD signal and XIRCS signal output from the address decoder (IC607) are converted

from 3V to 5V by the inverter (IC702, IC703, IC705) and level converter (Q701). IC704 is an inverter which oscillates X701
(36.864 MHz).

The image data is converted to the IrDA signal by the IrDA interface (IC706). The IrDA signal is output to the IrDA (T)

board and transmitted from the infrared unit (IC801). When the infrared unit operates, the power shutdown signal (CN801, Pin
5 PSD) becomes L, the power switch (Q801) turns ON, and Pin 6 of IC801 becomes H.

When the IrDA function is not used, the XIRSD signal becomes L, Q701 turns ON, and the clock for IC706 (36.864 MHz,

X701) stops.

The data read from the image memory is data-expanded by the JPEG decoder (IC503) and sent from the main

microprocessor to the buffer (IC701).

The following operations are the same as (i).