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This is a common question on this site. Amps of all types have protection circuits to keep them from doing a self meltdown. Testing follows this logic.
1. Remove all speaker wires.
2. Keep the volume down - all the way.
3. Turn the unit on.
4. If it does not trip off, then there is a problem either in a speaker or the wiring.
a. Reconnect one at a time until/unless it trips off
b. That will tell you where to look further.
If it does trip off, then there is an internal circuit issue in the amp and probably requires professional help to fix.
Hi Thanks for using
FixYa. Store these instructions in a safe place. After reading, store
these instructions along with the warranty card in a safe place. Whenever the power operation button is in the
STANDBY state, the unit is still connected to AC line voltage. Please be sure
to turn off the power operation button or unplug the cord when you leave home
for, say, a vacation. Note that the illustrations in these instructions may
differ from the actual unit for explanation purposes. Please click on this link
for further reference--- Denon AVR-1507 keeps automatically
Please do accept the solution if the issue is resolved or
else revert for further assistance.
replace all the electrolytic capacitors in the power supply. i had the
exact same problem with mine and once i replaced the capacitors it
powered up and stayed on and worked perfect. these capacitors tend to fail as they're of poor quality. this fault is very common on denon receivers, especially the later models.