This forum is dedicated to discussions pertaining specifically to the Motorola ASTRO line of radios (those that use VSELP/IMBE/AMBE), including using digital modulation, digital programming, FlashPort upgrades, etc. If you have general questions please use the General or Programming forums.
02/90 = General DSP hardware failure.
Corrective action is to turn the radio off, then on. If this doesn't correct the condition, reflash the DSP. If that still doesn't correct the problem the vocon will need to be replaced.