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The amplifier keeps blowing the mains fuse and i found R145,R170 are melted on the pcb can you help me fix this problem?

Step 1: check output stage. 2:power supply components. 3: check board for any leaking cap’s.

If these are glass fuses chances are you have a output transistor or transistors that has went bad. These devices are in place to provide sound in the speakers through a chain of other components. It will need to be looked at and diagnosed by a professional tech. This is something you may not be able to do yourself for reason of LETHAL HIGH VOLTAGES and lack of equipment and or knowledge.