AVR-1603 - no Sound exept over Headphones is a weak signal
Hi technicans at this Form.
I got a Problem with my AVR 1603 from Denon.
Problem: If I turn it on the Realais clicking .. but with no Sound. If i connect a Headphone a weak Signal is hearable.
My Powersuply for the Powermofets is around 47 Volts.
Any Solutions for this Problem?
I have a Sirquit Diagram of that Denon Amp.
Thanks and sorry for my bad English ...
Re: AVR-1603 - no Sound exept over Headphones is a weak...
First check the outputs at the output fets/transistors for any DC voltage. Reference your voltmeter to the speaker - terminal. If there is ANY DC offset, the amp is shutting down the outputs to protect your speakers from DC.
Is the power supply + and - 47 volts? If only one supply is there That is your problem because the supplies should be symmetrical.
Also look for any wiring problems from the amp to your speakers... any shorts? Try disconnecting all your speakers to totally eliminate any speaker problem and see if the relays still click. You should hear only ONE click when you first turn the amp on (delay of about 2-5 seconds). If they keep clicking the amp outputs are next.
Also, is there any indication on the front panel of what is failing?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
power off the unit using the front panel Pwr switch
press and hold SPEAKER A and B buttons;
keep pressing on the speaker buttons, switch on the AVR
when the display is blinking release buttons Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Any device has only so many self-protection cycles in it before it gives up the ghost.
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.
Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.
First of all please check the mode in which you are operating. Use the tester to see if there is tone on the speakers. Use a good DTS source and swtich over to 5.1 to check for requrired levels. If there is no sound yet, please open the cover and check for the connections to the front channels, check if the relay is clicking. You will have to look into the output mosfets for damage. for this the main board has to be accessed. If you think that you are not able to go deeper into find out the nearest Denon service centre. many such centres do not accept a set if tampered and so you need to be careful not to make it more costly. Hope my advice helps. Good day
You will need an adapter amp which converts the tiny tiny signal from a
magnetic phono cartridge up to the line level that you need to feed
into your AUX input jacks. They cost about $20 to $30 dollars and
can be found at Radio Shack. Unless of course you have a phono
input jack on the back of your Denon unit. Good luck.
It has a blown channel, unless you are good at repairing them I suggest an authorized Denon service center. This Denon not only needs the shorted output transistors replaced, but a few resistors, a couple of driver transistors and a capacitor on the preamp board as well. alot of parts to be replaced. I have repaired about a hundred of these over the last few years and my shop charges about $200 for this repair, other shops should be about the same.