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Denon PMA-480R

Integrated Stereo Amplifier (1992-94)

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Denon PMA-480R


Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.02%

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 86dB (MM), 107dB (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 434 x 120 x 282mm

Weight: 5.8kg

Accessories: RC-152 remote control


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re: PMA-480R


I'm wondering if anyone can advise.

I have a Denon PMA-480R amplifier which was used when a few friends came over
and now the unit has gone into 'protect' mode from what I understand as the mute/standby switch
flashes when turned on. I've checked the fuses inside, both of which are not blown.
I understand that the next step may be to 'initialize the microprocessor' by pressing a combination of buttons.
I've read the manual and unfortunately can't find any reference to 'initalizing the microprocessor'.

Any ideas to solving this would be greatly appreciated.

The paragraphs below are from this link:


Your unit has gone into a Protection mode. There are a number of things that could cause this. You want to make sure you have at least six inches of clearance between the top of the receiver and any other device or shelf. You also want to watch your volume to make sure you are keeping it below "0 dB" on a consistent basis. Also, confirm that you have no speaker wire exposed that may touch either another speaker wire or the chassis of the receiver. Please make sure that the unit is receiving the proper voltage and that you are not incurring any voltage fluctuations that would trip the protection circuitry.

You can try to resolve the issue by removing all the speakers from the unit and if the unit comes out of Protection then add the speakers back one by one until you're able to determine which speaker is causing the electrical short in the speaker terminal. You can also try resetting the unit's microprocessor in the event a logic glitch in the firmware is causing the protection circuit to trip. (Please see your owner's manual for your receiver's reset procedure)

This website is not affiliated with or sponsored by Denon. To purchase PMA-480R spares or accessories, please contact the company via their website or visit an authorised retailer.