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Yamaha RX-797

AM/FM Stereo Receiver (2005-10)

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Yamaha RX-797

Specifications

Tuning range: FM, MW

Power output: 100 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.019%

Damping factor: 240

Input sensitivity: 2.5mV (MM), 200mV (line)

Signal to noise ratio: 87dB (MM), 110dB (line)

Channel separation: 50dB (line)

Output: 200mV (line), 1V (Pre out)

Speaker load impedance: 4Ω (minimum)

Video Connections: composite

Dimensions: 435 x 151 x 389mm

Weight: 10.9kg

Accessories: remote control

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Comments

re: RX-797

I bought one of these for $50. It would not power up at all.

It's a quick easy fix.

Replace C254. It is on a small board that is mounted right behind where power cord connects to back panel. It's very easy to get to once you take top cover off.

For 230V/240V~ devices it has (22nF / 630V MKP)
For 110V/120V~ devices it has (47nF / 630V MKP)

While it was open and for an extra 20c I also replaced a resistor that is in series with and mounted right next to C254. But this may not be absolutely necessary.

It's R251(2.2k 1W).

(Thanks to our friends on hifi-forum.de for this info)

Amplifier works fine now. Sounds good.

re: RX-797

Thanks for your input and possible solution here. I continue to see folks saying to replace C254 but I have yet to find a schematic that shows exactly what that part is or where it is. Can you elaborate?
Thanks
Steve

re: RX-797

I take that back. I have found it. Question: If my unit turns on (meaning it clicks and the display shows up momentarily) and then in about 2 seconds shuts back off do you think this solve would work for me as well?

re: RX-797

Hi,

Your problem may be completely unrelated to an issue with a capacitor. Download the service manual and start on page 10. It explains how to start up the receiver in diagnostic mode. The diagnostic mode will tell you what is causing the fault and shutting down the receiver. Do this with NOTHING connected to the receiver.

The problem could be an issue with a temperature sensor, dc on the output of one of the amplifier channels, a bad power supply, improper load, etc. Report back with the fault and we can give you a little more guidance in repair.

-bob

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