Question about Denon DRA-455 Receiver
Had this Denon Reciever since arnd 1986? Never had any issues. Today noticed what sounded like clipping (I use it with a Nikko EQ Pre out/Main in) and Polk Audio Monitor 5's. Just sounded like it lost horse power. Turned it off, and when I turned it back on, nothing. I used the remote. When I engaged the power button on the remote again , the FM strength indicators lit momentarily. No LCD display, except tiny segment,very faint. I checked the remote, battery's, good. Tried manually and just like above. But the indicator(s) #24 OM, show mode, like in stand by. 5A main fuse good. No smell. Took the hi voltage plate off, no burning etc. Couldn't locate secondary fuse. D505/506 etc rec not fried on outside...soo any help would be much appreciated, especially with money being tight. I used to work for a Denon warranty authorized service center in the 80's called Astro Service Center in Burlingame, CA for the Good Guy's etc. I did lots of research back then. Thanks Tony
SOURCE: avr 1804 denon 7.1 reciver
Did you check the Audio-Video slider button in the middle of the remote? It needs to be on Audio, else the remote sends video channel number signals when you press the numbers.
Posted on Jan 09, 2008
SOURCE: Denon AVR-1602 Overheated!
Hold on......there are 4 small resistors in the power supply that open up ( no longer work ). This is a VERY COMMON PROBLEM for 01-02-03 model Denons. They are "flameproof" resistors, so when they burn open, there is no trace of a problem, they look normal. This pic is from a 1601 which is almost identical. The resistors are missing from the picture, but you can see where it is marked R 141, R142, R143, R 148.
If your shop measures across these resistors and they are more than 10 ohms, then they are blown, and this is your problem. These should each be replaced with a 1 ohm 1/2 watt Metal Film Flameproof resistor. You must also remember that the little 1602 is NOT a professional unit, designed to be cranked for hours on end. It is a home theatre receiver.
If this solves your problem, be happy and dont beat your receiver to death. .....THIS BEING SAID.....the other reason that these blow is because one or more channels are blown and drawing too much current from the power supply. IF that is the case, be prepared for a big bill. DO NOT try and fix this yourself, as the entire receiver must be taken apart , right down to the bare chassis to get this board out. Leave it for a professional. Have them check the resistors first, it only takes about 10 minutes to get the cover off, check the resistors and put the cover back on........hope this helps... Rob
Posted on Mar 13, 2008
SOURCE: denon 1508- no sound but smoke.
perhaps u might consider going to a(n) (unauthorised) repair centre. just check with folks around u or maybe audio forums within your area. authorised agent doesn't always mean the best. i suspect they may have used reconditioned components.
Posted on Sep 01, 2008
SOURCE: I called a Denon service
Blinking of power indicator means the amplifier is in protection mode.First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.
AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. There are seven amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
Posted on May 19, 2011
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