Radio Make and Model: connex 4800 dxl
PCB Number: ept690010z
PLL Number: dont know
Test gear available: multi meter basic bench equipment.
Symptoms: annoying talk back i want to disable it.
What is working: every thing is a1 working
What has been tried: nothing new radio
Did it suddenly happen ?: no it came as is
Anything else that may be of help?: not that i know of.