Make shure your speaker wiring is solid hookup to amp and spekers (NO CROSSED WIRING). Also make shure speakers are not wired in parallel or the speaker impeadance will be to low and amp will kick out.Turn speakers off then hook up headphones and crank up volume then see if amp kicks out.If it does you have an internal overload and needs serviced. If it playes ok then you must have speaker problems or wiring.
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The main power fuse for most amplifiers is a fast blow, 125 volt fuse for the US and a 250v fuse in countries with 220v. This unit is 125 watt so the main fuse should be 2 amps or so. The correct fuse size is written on the circuit board next to where the internal fuse was located.
hi, its not because of dust. AZUR 640A offers loudspeaker protection if the output of the amplifier goes to a high constant voltage (DC) because of some internal fault. This is a rare fault although detecting it could just save those expensive loudspeakers. Due to the necessary sensitivity of the DC protection circuit, hard clipping of the amplifier may cause DC protection to be triggered. If this fault occurs switch the unit off, power up again and check operation with a reduced volume level. If the DC fault occurs again contact your dealer for service. ok
If you try JUST headphones (spkrs off), does it still go into protect?
If so, I would say ( from my previous 50 or so receivers)
that it needs new power supply capacitors
If not, either one of your spkrs is faulty or they arent connected solidly at both ends
are you playing a cd which you recorded at a higher level? if so, you are overdriving the amp. you may want to check some of the setup menu items which could contribute to this. it also could be caused by a driver or component in a speaker which is getting maxxed out, which is easier to do with the cd source than any other in some cases. denon protection circuits are quite sensitive. good luck
The protection circuit is self resetting, it operates only when there is a fault condition in the amp. there is most probably a failure in the output stages of the amp causing a dc offset condition in the speaker output. The protection cct operates to prevent damage to your speakers. It may be difficult to offer a solution to you for this, it gets a bit complex to fix from here...you may have dry solder joint problems in the output stages, or more likely, failed output components. if you have a transistor checker(ohms meter), then you may be able to determine if any output transistors have failed, I recommend taking the amp to a good HiFi guy for repair. Many (including myself) often replace the all transistors to the last 2 stages when outputs fail. assures reliability in the future to repair this way, but the cost goes up a bit also. expect at least $120 to repair is it is a failed output stage.