Question about Kenwood Audio Players & Recorders
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.
Posted on Jan 02, 2017
I just picked up a non working AVR 900, there are a total of 4 fuses inside the unit: 2 on the protect board, 6.3A and 8A, and 2 in the middle near the front. I was told by Denon the following might reset the microprocessor. 1) unplug unit 2) press and hold tuner and video select on front panel 3) plug in while holding buttons Unit display should flash until you let go of buttons. Unit stays on you should be ok/ goes back to red- service They also said: There are 3 types of protection that will commonly occur with our receivers. This is designed to protect the unit from permanent damage. 1) Thermal Protect = When the unit overheats this will occur, usually if there is not enough air space above and around the unit. There cannot be anything directly on top of the unit and there must be at least 4 inches of airspace above the unit. 2) Overload Protect = Most commonly occurs when a strand or more of copper speaker wire is not securely connected to the speaker terminal and is touching the chassis of the receiver. If the volume is turned higher than 85% this may also occur. If you need to turn the volume higher than this point to get the level you want, you need a more powerful amp. 3) DC Protect = When an amplifier fails this will occur. This will protect dc current from damaging the speakers. When this happens the unit will need to be serviced. I had a bad 6.3A fuse ? I replaced it and tried to reset. The microprocessor would not reset. I had the exact same results you had. The chip on the back side of the front IC board was smoking. Before I attempted the reset I asked Denon if it was worth sending in for repair. The answer was "NO" BC
Posted on Apr 24, 2007
you can check the output transistors for short circuits with the low ohms range or diode checker . If they have failed, then it is often a good idea to replace all as much stress can be placed on an output array in this type of failure. to repair reliable, all outputs on an offending channel should be replaced.
Make sure the fuse you replaced was the same type of fuse. check markings.... T stands for sloblo... a fast blo duse may let go at turn on. The power supply may have a shorted rectifier diode in it also.
be aware however, every time a fuse of that rating blows... more damage may be occurring to the amp.
Posted on Dec 15, 2007
Don't bypass the relay contacts. They serve to disconnect the amp stages from the speaker if a DC condition is present, and in doing that, save your speakers form damage. Check for a DC offset condition on the junction of the emmitter stabilizer resistors to the STK0040 on each channel. They will be 0.47 ohm power resistors(2 per STK) connected to pins 3 and 8 of the STK. Anything substantially greater that 100mv here generally indicates a blown STK. Don't bother to change both, but just the one that is faulty. Another common problem for this age of amp. The high silver content in the legs of the transistors allows for "growth" between legs and internal connections of the transistor. Check for "black death" on the legs of transistors driving the STK. . . I tend to replace them if in doubt. If you need expert advice, comment me back. I am an audio specialist.
Posted on Feb 03, 2008
SOURCE: I have a kenwood KA
Most likely the output transistors are shorted. This causes the output stage to draw too much current and blows the fuses. Expect a parts cost around $20-$40. Add in the local labor rate for the total repair cost.
Posted on Apr 17, 2008
SOURCE: I have a kenwood KA-94
Unit may have any one of several problems: defective or shorted speaker(s), -- ICs work within certain circuit paremeters; B+&B- voltages from power supply also provide voltage to secondary drivers and biasing circuits. Any shorts and/or transistor leakage may cause failure under load. The entire circuit should have been tested before use
Posted on Aug 19, 2008
Tips for a great answer:
Nov 15, 2016 | Kenwood Audio Players & Recorders
Nov 15, 2016 | Kenwood Audio Players & Recorders
Nov 15, 2016 | Audio Players & Recorders
May 26, 2015 | Kenwood Audio Players & Recorders
Nov 11, 2014 | Audio Players & Recorders
Mar 07, 2013 | Audio Players & Recorders
Mar 27, 2010 | Kenwood Audio Players & Recorders
Jul 20, 2008 | Audio Players & Recorders
79 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: