The CG-3000 is a clone of a SCG tuner. It uses a PI network for tuning. There are many schematic diagrams on the Internet. However 95% of those have so low resolution that they are not readable when you zoom in. I finally found a schematic with enough resolution to show the component values. It is the output circuit that receives the highest voltages when matching a high impedance antenna and those are the most likely to be damaged. To be proactive I changed mine to 6KV types low loss Vishay Cera Mite and TDK CC45SL3 types. Below you can find the schematic, should you need to repair your tuner.
If you need to change components in the output circuit and want quick info, all the capacitors are either 100pF or 50pF ceramic. There are series and combinations of from right to left 4x100pF par, 2x100pF par, 2 x 50pF par, 2 x 100pF ser, 2 x 50pF ser. This gives the values 400pF, 200pF, 100pF, 50pF and 25pF. The relays can then switch in several combinations from 25pF to 775pF. Note that the schematic does not show that the 100pF cap is two 50pF in parallel, that the 50pF is two 100pF in series, that the 25pF is two 50pF in series. I may have an older or newer hw version than the schematic.
