[ptl]

Hi Ken,

The BCR-NWU3 dock has the full complement of 22 pins. The line-out function seems to operate perfectly well without anything attached to the dock (i.e. no USB cable or power attached) and immediately overrides the headphone out.

If you look at Page 25 or 26 of the Service Manual, there is a breakdown of the WM-PORT pin connections (pins 14 and 17 are highlighted for obvious reasons):

1 GND
2 RESERVE (OTG)
3 D+
4 D-
5 GND
6 RESERVE
7 VIN
8 RXD/WAKE
9 CRD_AD
10 TXD/SLEEP
11 USB_DET
12 UNREG_OUT
13 AU_L_IN
14 AU_L_OUT
15 AU_COM
16 AU_R_IN
17 AU_R_OUT
18 VIDEO-GND/GND
19 VIDEO_IN/OUT/OPEN
20 DCIN
21 DIGITAL_OUT/OPEN
22 GND



If anyone wants to attempt a DIY cable using the supplied USB cable (Sony WMC-NW20MU), the pins are ordered as follows:
Pin 1 ---------------> Pin 22
______________________
/1011101010100000010001\

As far as I can tell, connecting pins 14 and 17 up to a 3.5mm jack or pair of RCA connectors should work (however, I don't know how the other pins will affect a DIY cable). The Sony WMC-NWR1 looks like a possible alternative cable which could be modded for purpose.