TS440S.31 The circuit boards to work with, are called: DISPLAY UNIT (X54-1870-00) (C/4) This has the ACC 2 JACK. SWITCH UNIT (X41-1610-00) (M/14) This has the AFSK INPUT. The eaiest way is to remove these two boards 4 screws hold the ACC 2 JACK, and 2 screws hold the AFSK INPUT board in and they are located at the rear of the transceiver. If you are interested in following the SCEHMATIC in your manual, the leads you will be working with are ANI, and GROUND which is the PURPLE LEADS, and the FSI lead and GROUND, which are the GREEN leads. The problem is that when kenwood designed this rig, they brought the DATA INPUT(ANI) from the ACC2 JACK to connector J25 of the IF UNIT. This coming in after the Processor, and Microphone Amplifier does not allow sufficent amplification of the signal, thus very low, or no audio at all. What this modification does is swap at the rear of the RIG the FSI, and ANI signals, Which also could be done on the IF UNIT board, and for some may actually be eaiser. In my case the leads were just a bit too short to allow this modification to be accomplished on the IF UNIT. CONTINUED IN FILE TS440S.32