This is my initial work with developing a digital modem board for RF use. I have various digital modulations working on this prototype. The AVR32 isn’t quite enough to do everything on board.
I came across a DR-635 that was dead. After removing the panels it was clear that the pre amp IC had failed. Note that the heatsink comes out of the board thru a slot for cleanup. Below are pictures of the repair. I used solder paste and a hot air station to repair the unit after initial trace and PCB repair using superglue (Don’t breath fumes). Parts were purchased from Alinco.