Question about Sony STR-K840P
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Posted on Jan 02, 2017
The only way your surround sound will work is if you have either the coaxial or fiber optic digital hookups attached to a PS3/Blueray/DVD/Cable box/Satellite box that have digital sound outputs. If you are just using the 1970's version of the red/white audio cables that is stero only.
Posted on Apr 11, 2008
SOURCE: Sony STR-D665
Protet mode is a special diagnostic mode that starts when a fault is detected.
When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.
Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.
Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.
If you do all the above and still get Protect, then there is a real fault.
In that case the unit may be disassembled and tested to find the fault.
If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.
Posted on May 29, 2009
That is the common symptom of the defected STK-IC in power amp.section
that busted already or just a loose connection.First try to resolder
the pins of STK-IC and also all component parts joint in power amplifier section if its works! if not that is the time you replace
it, so it works normal again.
Hope it may helps you...
Posted on Jun 08, 2009
This is a logic problem with the internal microprocessor. A quick experiment: Turn the unit on for about 2 minutes and shut it down. Doe sit power uip in this case? If so, I'd suspect that the heat generated during normal operation is creating an internal problem thaty is preventing the micro from recognizing the "off" condition. The power data line is hung and is not being recognizwed by the micro so any attempt to turn the unit on will fail. The unplug/re-plug essentially clears or resets the unit.
If the unit is new, return it for warranty repair. It will be important to describe when the unit fails however. Try to see how long it must remain on for the problem to occur.
Update this with your results if the unit is not under warranty and we'll try to narrow it down.
Posted on Nov 05, 2009
SOURCE: I have Sony STR DE845
If you consult the card that came with the remote, you will find several codes for "Sony". You will need to experiment with each code until you find one that will power the receiver on and off. Then you will have control of the receiver. If you don't have the card, then go to the web site and download a copy in PDF format from there. I have a lot of Sony stuff, and I have found that the codes varry according to the year the equipment was made and its function.
Posted on Aug 31, 2010
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No, it's in trouble.
Generally speaking, an amp protects 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. Eure 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.
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