good day all, was hoping someone could help me with a problem im trying to fix on a older stryker 447 hpc the big chasis version..my problem is that the speaker jacks act if the are dead but I can hear my talkback and the pa jack also works..just have absolutely no white noise from receive.. I know the receiver section is working right as I can see the meter climbing as I increase the power from my signal generator.. no sound at all for receive. rf gain and squelch and volume pots have all been ohmed out and are working.. also changed audio chip with new one..still nothing.. im not the best with schematics so if someone would be kind enough to look at the 447 schematic and possibly point me in the right direction I would be very thankful.