Symptoms: display after pressing the power switch worked, characters, secondary electrical disconnect after about ten seconds, the power led is flashing. That has entered the State protection.PNTservice manual download site
Amplifier repair process: measurement standby inverter rectifier voltage and output voltage is normal,PNTservice manual download site
PNTservice manual download site
General machine protection level after the first point of failure is to check zero point output, after the main converter step-down power circuit after work, zero-point measurement for each channel, quickly found potential offset the left surround output to 3.5 v, this channel after disconnecting power is no longer protected, repaired machine back to normal after the channel amplifier.PNTservice manual download site