Yamaha RX-797: Replace the device fuse

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The Yamaha RX-797 is a high-quality hi-fi receiver that has a powerful power amplifier. But even such devices are sometimes affected by a defect.

The Yamaha RX-797 receiver no longer gives any sign of life

As with any other technical device, the Yamaha RX-797 receiver can also have a defect in which the device no longer gives any sign of life.

  • This description of the error suggests that the device fuses have blown. However, it remains to be seen whether simply replacing the same fixes the error.
  • In most cases it is the case that a device fuse has blown due to another fault that is the actual cause of the defect.
  • Before opening the device, you should always disconnect it from the power supply and from all other connections. Immediately observe the relevant safety precautions when repairing such devices. The repair is at your own risk.

Replacing the device fuse (s)

  1. First open the housing of the Yamaha RX-797 receiver by unscrewing the housing screws and removing the cover from the device.
  2. Find the cause of a problem with cable television

    Are you annoyed by a cable television disruption? Find the cause and ...

  3. The device fuses are located on the circuit board in the rear left area of ​​the device (behind the mains transformer). Replace the device fuses with ones with exactly the same values. Never use fuses with higher amperage values.
  4. You can then close the device again and connect it on a trial basis. In most cases, however, the device fuses will be activated immediately after connection to the Blow the power supply again, as the fuses are not the actual cause of the defect should.

Defective electronic components are often the cause of device fuses blowing. In many cases, the defect can be remedied by replacing components IC252 (integrated circuit), transistor Q254 and capacitor C254 with new parts. Of course, the fuses also have to be changed again. Please note, however, that such repairs will invalidate any existing guarantee and that such interventions should only be carried out by experienced specialists.

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