What to do if the Toa MA-725F's fuse is okay, but the power light isn't on and it doesn't work?
If the fuse is working, but the blue power light is off and the Toa Amplifier isn't working, check the STB PCB.
What to do if my Toa MA-725F Amplifier doesn't work at all?
If the Toa Amplifier doesn't work, remove the rainbow cable from BGM BOARD CN7303. Then, measure Pin 5 to chassis voltage; it should be 3.3V. Also, measure Pin 7 to chassis voltage; it should be 5V.
Why does my Toa MA-725F have no output, even though the startup process seems fine?
If the Toa Amplifier starts up fine but has no output and the POWER SUPPLY BOARD red LED is off, remove the red and black lines of the POWER STB BOARD CN202 and measure the voltage at both ends to ensure it's 16.8V. Also, remove the rainbow cable of BGM BOARD CN7303 and measure the voltage of Pin2 to the chassis to check for +12V and Pin 4 to the chassis for -12V.
What to do if the Toa MA-725F Amplifier has no output after powering on, and the BGM BOARD red LED is off or doesn't flash continuously?
If there's no output after powering on the Toa Amplifier, and the BGM BOARD red LED isn't on or doesn't flash continuously, the cause may be a faulty BGM PCB.
What to do if the Toa MA-725F Amplifier's blue power light doesn't flash and the machine doesn't work after turning on?
If, after turning on the Toa Amplifier, the blue power light doesn't flash continuously and the machine doesn't work, the cause may be a faulty ETHERNET (ETH) PCB.
What to do if the Toa MA-725F's fuse is open and there is no response?
If the Toa Amplifier's fuse is open and there is no response, remove the POWER SUPPLY BOARD heat sink. Then, measure Q1A, Q2A, Q8, and Q10 to check for any short circuits.
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