DVP-NW50 (serv.man2) - Sony DVD Service Manual (repair manual). Page 15

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3-3. Control signal input

SYSTEM 

CONTROLLER

(U1)

IR REMOTE

IR IN

(J7)

REMOTE

CONTROL

RECEIVER

(U1)

IR REMOTE

IR OUT

(J8)

PHYSICAL

LAYER

TRANSCEIVER

(U26)

NAND (U2),

TIMER (U25)

IR REMOTE

IR OUT

(J8)

TX signals

RX signals

TX+/TX-

RX+/RX-

KEY SW (S1-S23),

DECODER (U11)

Please refer to Block diagram on page 25 in the Service manual.

When SYSTEM CONTROLLER (U1) boots up, SYSTEM CONTROLLER starts to check 
control inputs of four sources in DVP-NW50.

1.  Key SW input on the set 

DECODER (U11) converts the key input detection signal and output to SYSTEM 
CONTROLLER (U1).

2. Wired IR REMOTE input

The input signal is wired SIRCS signal. The IR input signal is transferred to IR OUT terminal for 
next device automatically.

3. Remote commander input with Infrared signal

REMOTE CONTROL RECEIVER (U1) convert the Infrared signal to electrical signal.

4. Ethernet line input

The Ethernet line input is received and processed physically by PHYSICAL LAYER 
TRANSCEIVER (U26). Then, the signal is transferred to SYSTEM CONTROL (U1) and 
decoded logically.

While communicating with Ethernet line, one blue LED(D21) continue flashing by data 
communication and two red LEDs are lit continuously.