Excerpt from Prospectus: Pioneer SX-102 , SX-202 R, SX-702 RDS
If the gold cap for storing the transmitter decreases over the years, you can also replace it yourself. The defective goldcap has the number C707 on the board (located directly next to the speaker output in the direction of the power cord) and has the shape of a small black block (0.047F / 5.5V). You can safely install another capacitor, as long as it can withstand at least 5.5 V.