20 Most Recent Denon AVR-1905 Receiver Questions & Answers

There may not be any facility to update the firmware for this model without taking to the service center. This model does not have any device input like SD card or internet connection that would enable download of firmware upgrade. The later Denon models have this capability. You will have to consult the local Denon service center for advise.

Try a reset to factory defaults and reprogramming your preferences. Time consuming, but sometimes things go bung inside the microprocessor controllers.

Problem is most likely shorted output transistors. These are the large transistors mounted on the heatsink. When these go short, they usually take out some the adjoining resistors in that channel.

Hi...

1st thing to check is for GOOD speaker connections at both ends
and not mixing A and B speaker wiring.

A Denon is usually a good brand. Might be worth servicing if need be.

i would check the output ic/transisters

there is a link to the manual from this page. http://www.retrevo.com/s/Denon-AVR-1905-Receivers-review-manual/id/363bh836/t/1-2/

there is a blown channel or bad power supply in your receiver.

setup > option setup> then change -20db limit to limit OFF

zone 2 volume can be adjusted by zone2 remote control (small one which came with the unit) or by main remote control if you switch it to zone2 mode. My main rem control has a slide switch i have to put in zone 2 position to operate zone 2 amp.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Not with this unit.

But WHY? Bi-wiring is a myth. Whether the channel's double wires join (dead short) at the amp end or the speaker end makes no electrical difference to the speaker or the sound. But it DOES get you to buy more esoteric wire. Cha-ching for them!!!

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/biwire/Page1.html

http://www.avforums.com/forums/interconnects-speaker-cables-switches/46335-bi-wiring-cables-what-load-long.html


But to flip an old saying, believing is seeing (or hearing). Go for it if you want. Someone is always willing to take your money.

When you turn on the Receiver if after 4 seconds you hear a click and the standby light starts blinking - it indicates an output short circuit. You will need professional help to replace the components because modern AV receivers have very complex construction ( multiple circuit boards mounted on one motherboard and a lot of interconnecting cables )