ALINCO DR-605 Investigation & Repair
This nice little rig from Alinco is on the bench for repair. Initial checkes showed it pretty much dead on arrival, except for the LCD backlight on one side. It was understood that it may have suffered lightning damage. First checks with the covers off showed IC206 (7808 voltage regulator) to be open circuit. I have to say that this rig is a nice piece of kit to work on, with easy dissasembly. So removing this pcb was pretty straight forward and a new 7808 was fitted. But there was still no life from the set. Next step was to remove the front panel assembly and check the voltage rails for the logic system. Here R446 was found to be high in value and when applying power direct to the 7805 voltage regulator, it was running hot. So I replaced the resistor and the voltage regulator. Now the logic rails are correct and the processor runs at switch-on, with the display text appearing - but the info on the display flashes. There is also no audio. The UHF board with the regulator on...