Shure Wireless Receiver Repair

[Yamin]

Hi guys,
I have got faulty Shure BLX4 wireless system in for repair. The wireless microphone does not 'lock' to the receiver and hence no audio (the ready LED is not illuminated).
I have checked the wireless microphone whether it transmits. I was able to see and hear transmission using my SDR.So I'm assuming the issue is with the receiver.I couldn't find schematic for this model and have checked out schematics of other models which are from Shure and they are not similar.
I'm pretty new to RF electronics though its something I am really interested in.
I was hoping to get some idea on how to go on troubleshooting with this.

Thanks in advance
P.S I wasn't sure if I should have posted in the RF section of the forum.

[Vicus]

I can't help you much but I suggest you to find another working system and try to swap transmitter and receiver. The fact that it trnasmit something doesn't mean it transmit the right signal. There is some pilot tone that receiver use to recognise the right signal from the noise and if it don't work rf led not light up.