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Start by checking the emitter resistors (very low value resistors by the output transistors. They open in case of a short in the output transistors. If they are good, you need to look up "dim bulb tester". It's a lightbulb in series with the hot lead of an extension cord. If you have a variac, much better. Like mentioned earlier, a simple DVM in diode check mode can find gross faults in transistors. I have repaired many Pioneer receivers and I have no problem with that model.
Look for the output inductor (one per channel) and check from ground to the inductor with a DVM for voltage. A few millivolts is OK, volts are going to keep the speaker relay from closing. Look also for blown fuses.
A schematic can be very helpful.
Do not use output transistors from EBAY. You will get counterfeit devices that will fail and you will go in circles. As mentioned earlier, ON semiconductors work in that receiver.
Go slow and be careful and you will get it going. Be careful reading about "rebuilding" the power supply. Output failure rarely damages the power supply.
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