Hi,

A stupid question...

The RCA pigtails are not mis-marked or re-pinned to the RCA INPUT cables are they? There are 4 OUTPUT and 2 INPUT cables on the sled.

I know it worked before, I saw that in an earlier response. It hasn't been removed after it was working, and reconnected wrong was it?

The 100 Ohm resistors could be checked with an Ohmmeter as well.

There is a way to check if the Output Amplifiers are working. This can be accomplished by shorting the inputs of the INA2137 together (preferably through a 0.1uF or a 1uF capacitor), and see if you get output at the silent Sled Output cable RCA. This would check the other side of the Dual Amplifier chip. The capacitor is used to isolate any possible additional DC or ground from causing problems at the direct coupled inputs to the INA2137.

The INA2137 uses pins 14 and 8 as inputs. Apply the capacitor or a small value resistor (100 Ohm to 1k), short across the INA2137 pins 8 and 14 and see if you get output at the Sled RCA connector that is silent. Do this for both INA2137s to check them out.

Check it out and let us know. We'll go from there.

Ross