Question about Denon AVR-3805 Receiver

1 Answer

Denon receiver follow up

How do I test to determine if my preamp is overheating as you state?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Denon Master
  • 19,396 Answers

Well I do not know how is on your model, usually it is all on the same mainboard. if its transistors you change the transistors , or there may be a thermic swithch that turn system off.
You should also consider that may be a fault on some of the control chipset.
A problem of this kind won't be an easy DIY unless you have a good background.
I do not have diagrams or schematics for your model, If I find some, I will send them tomorrow.


Leave your denon unplugged overnight, place it away from other devices, until you fix the problem.

Give me your location if you also need directions for local service support.

I will post back tomorrow

Posted on Apr 05, 2008

  • Ginko
    Ginko Apr 06, 2008

    Hi jonny , sorry about yesterday, but it was 1 am here in UK. I am just checking specs for avr 3805 right now, and I can see it has got a 120 watt per channels amp in output. This is one more reason for suspecting it is an amp overheating problem.


    If you watch at the inside of your unit , as from this link, You will notice a large metal cooling plate. This has the function of cooling down the amp final transistors.
    Your Denon had no cooling fan involved, then, unless is not a problem with the cooling plate out of place, you will have to change thermistor and eventually transistors from amp unit.
    Parts involved are:
    Thermistor (approx $20 from Denon supplier)
    Transistors: 2sb1560, 2sd2390 , bu2090 (approx $50 each)
    Another possibility is that power supply started generating more heat than normal, and being very near to thermistor and amp it is causing the unit to shut down. In this case you change the power supply, which costs approx $100.
    All the parts should be tested to locate exactly the problem.


    Here is a supplier selling the replacement in UK and Europe

    Here is a retailer from US serving the rest of the world

    Here is catalog with pictures of the components involved

    Denon AVR3805 is still an expensive device, even if its production had recently been discontinued. This is not going to be an easy fix, you will have to take apart the 3805, test its components, locate the problem among the above, unsolder and solder back components working with precision in tiny spaces.Unless you have a strong background in DIYing electronics, consider also calling out a service.



    Regards

  • Ginko
    Ginko Apr 06, 2008

    In addition to my last post, in your case the device is working, then there is no need to check the components for continuity.
    What the repairmen will probably do, is changing the thermistor first.
    If the machine keeps shutting down there will be need for checking the temperature on amp unit and power unit to see which one is likely overheating.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Hookup a pre-amp and equalizer to a Denon AVR 982


Hi
you can choose any input on the Denon and select it from the front panel
setup the Equalizer and the preamp connections and plug it in the selected input on the Denon.
Thats it.
if u haveany Questions dont be a stranger.
good luck

Mar 16, 2016 | Denon Audio Players & Recorders

1 Answer

Do I need an external amp for my turntable if I have the Denon AVR-3801 receiver?


If you do not have the proper phono inputs, "built in preamp" you will need a external amp, since most receivers and amps have done away with this, the signal from the turntable is very weak and not enough on it's own.

Mar 03, 2012 | Denon Audio Players & Recorders

1 Answer

Denon AVR2106 One output channel shorted and blown. 2 power transistors shorted, emitter resistors and base resistors blown Have replaced all, including bias transistor I think bias is still wrong (no...


I would also replace 2sa992 (2pcs) and 2sc1845 on preamp board- sometimes they look ok when you test them by regular meter. Check 1.2 kOm and 4.7ohm resistors at preamp pcb. Check diodes on output pcb (could be smd type, connected from base of output transistors to emitter i think)

Sep 07, 2011 | Denon Audio Players & Recorders

2 Answers

My dad has a Denon Al24 processing receiver. We have had the receiver about three years. The problems I have found so far are that the sub channel coming out of the receiver has continual hum that is...


First check to see if the sub woofer itself is not defective.
There are components in the various associated circuits that are failing. I realize the receiver and sub woofer are not old, but this is very possible.
You will have to determine which of the units is defective, then you can call the manufacture to find out who their authorized service rep is.
From experience, I have seen electrolytic capacitors of various types cause these types of faults. The service work is time consuming, but can be achieved. The labor cost for the time involved to troubleshoot the unit will be more expensive than the parts themselves.

Jerry G.

Nov 14, 2009 | Denon Audio Players & Recorders

2 Answers

Denon AV Receiver Model AVR3600 locked at'' Protection '' mode


The power supply is damaged and needs to be serviced. You have done exactly what you should have to test for an outside issue, it's the receiver.

Nov 02, 2009 | Audio Players & Recorders

1 Answer

Denon receiver follow up


A sound spike should not heat up the unit enough to shut it down. There is another problem. What is the time frame for the shutdown? Is it only after the unit has been running for a while?
Dan

Apr 05, 2008 | Denon AVR-3805 Receiver

1 Answer

Denon Receiver flashed PROTECTION and stopped working after plastic smell


i just had the same thing happen to me what did you do to fix it?

Dec 28, 2007 | Denon Audio Players & Recorders

2 Answers

Denon AVR 4306 receiver not connecting up 1080p with playstation 3


HELLO, I DID A LITTLE RESEARCH FOR YOU AND FOUND IN YOUR MANUAL ON PG 103 IT STATES "RES OF 1080P ARE NOT HANDLED"

Jan 21, 2007 | Denon AVR-4306 Receiver

Not finding what you are looking for?
Denon AVR-3805 Receiver Logo

Related Topics:

106 people viewed this question

Ask a Question

Usually answered in minutes!

Top Denon Audio Players & Recorders Experts

 Grubhead
Grubhead

Level 3 Expert

4751 Answers

Dennis McCollum

Level 2 Expert

137 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6694 Answers

Are you a Denon Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...