Hi Russ,
I have a similar issue as grimberg (not receiving the lock light) and I was wondering if you could help.

My configuration is the following:
CD transport source (s/pdif)
4:1 MUX receiver
COD dac.
Dual low current PSU

I have assembled everything and I have 7.5VDC to the DAC and 5.5VDC to the MUX.
Switch settings on the MUX are as follows:
1: -
2: +
3: +
4: -

I have a RCA coax directly connected to the 1st terminal of the input section on the PCB.
The led's "+" lead (small filament in the package) is connected to the square solder pad on the board.

For connecting the MUX to the COD I have done the following:
MCK - SCK
G - GND
BCK - BCK
LRCK - LRCK
DOUT - DIN

On the COD I have left the switches in the default position, 0-0-0-0 respectively.

I have just verified the above connections with a multimeter and they are all connected correctly.
Should I be able to receive a "lock" even if the DAC isn't connected?

I also have the TORX kit to integrate if I should need to compare test but the MUX should already be able to receive the simple s/pdif signal coming from my CD transport.

The CD transport, though a little older, still works well and other DACs have had no issues.

BTW: there was no selector switch included with the MUX order.
Thanks in advance!

photos were too large to post here.

Edited by user Thursday, April 4, 2013 3:10:29 PM(UTC)  | Reason: Not specified

Can you try posting some larger pictures? If you are having trouble uploading them, you can email them to us using the feedback@ email address.

Edited by user Wednesday, July 3, 2013 1:43:33 PM(UTC)  | Reason: Not specified