20 Most Recent Harman Kardon AVR 340 Receiver Questions & Answers

is some speakers is defective, or not present (connected), check all cables

If your unit has a speaker protection mode (5-8 second delay when 1st turned on) defective speakers and/or speaker wiring may be causing the protection circuit to do its job...protect the speakers. Disconnect all speakers and test HK in all modes (tuner, CD, DVD, etc.) using headphones. If you still cannot hear audio then it's time for a shop repair. Although I recommend factory authorized service whenever possible, a "local" shop that is certified by other well-known brands may be an option. If Yamaha, Onkyo or Luxman certified your local repair shop then it's a sure bet that they can properly repair HK's no longer under warranty.

What is the state of the indicated but inidentified digital source? It's trying to tell you to check IT.

Hi and welcome to the site,

Almost always, the described symptoms of the HK AVR340 indicates that it has kicked into auto-protect mode. While this is a power supply action, it is triggered by the logic controller that has sensed a fault and halted the system to prevent further damage.

The only easy user doable try of a fix is to check the speakers and their wires. Ensure that the speakers are within specs, no stray strand touching its opposite, no frayed wires and are connected correctly to the rear of the HK. All others require that the AVR340 be opened up to effect repairs.

Options then are:

• consider a DIY (do-it-yourself) repair if and only if comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices. Access to a Service Manual or at the very least, a schematic diagram would be a necessity;
• should you be uncomfortable with a DIY, perhaps your best bet would then be to consult with and/or seek the services of an authorized Service Center (specially if still under some form of extended warranty) or a qualified professional.

Are you considering a DIY?

Good luck and thank you for asking.

Hi,

If you bought the extended warranty, you need to go where you purchased it and they can look it up on their computer system.

Is the speakers defective, or not present (connected), check all cables

Thanks.

hi

texasfan_1There could be a lot of reasons why, Mostly it is on the one or more

of the Protection Circuits that have been activated .


Here is a partial list of Reset Procedures:






Here are some points to check inside the unit :





a ) Check if +Vcc and -Vcc is available ( you can post it )

b ) If available , Try to measure each of the main amp ( you have

more than one ) offset voltage [ Center of the two ( 2 ) resistors ,

with the yellow arrow inside the blue circle ]

c ) If there is an offset voltage of more than 0.7V then , surely

these could be one of the candidate for troubleshooting for

component level.

d ) you may then , need to remove the pair Power Transistors

and check it outside the Board later.

e ) Once you power it up , then it produce an audio on your

speakers , you may need to replace the pair of Power Transistors

after checking the output or offset voltage has changed and close

to 0.7V.

If still for instance , it still do have an offset voltage , you may not

hear audio yet, , Have a check on the Driver transistors to

VAS circuits if these happens.



f ) If for instances, that all main amps seems OK , basing on your

Voltage reading ( use the chassis as your reference ground )

then still having no audio on the output ( speakers ) , you may

need to use a Signal tracer to trace for missing signals going

to the input of your main amplifiers.


g ) here is a link to guide you , how to troubleshoot missing

audio :


http://www.fixya.com/support/r4008719-diagnose_not_having_audio_right_channel

the unit may not be the same as yours, but the principle in

troubleshooting is the same


There could be other causes , but try on those first,

Let me know , if you need further assistance , once you restarted

probing around.


Hope these guides helps!

Regards,

palaboy

If you bought the extended warranty, you need to go where you purchased it and they can look it up on their computer system. If it's out of warranty, the repair cost is debatable. Between 125-175 average. 50% of the cost.

That is not good I have to say :/

Check for transistors that read 0 or look like they got cooked,check the main fuse and if the fuse is blown,there's a reason so dont replace the fuse and turn it on just to blow another one. I would also check the audio amplifiers,usually they are STK's and are epensive (around 70-80$ a piece) and could take a while being they are manufacturer backordered. I would highly discourage using any import amplifiers as they are very low quality and fail within the first month or so.

Should it be lightning damage look around where the power cord plugs in,there may be 2 or 4 rectangular resistors that are open, (reads infinite in a resistance scale) those are easy replacements. Diodes are also a common factor,any that read 0 are usually bad unless they are close to a coil or transformer.

you need to reset the receiver, hold the sure mode and tuner mode at the same time with the unit of(or in stand by).this will reset thwe receiver the only down fall is you will have to reset all of your settings.

I have the same problem. Only one speaker is hissing and only for analog sources. No hissing when I select Coax.

According to the Harman-Kardon AVR 630 User Manual, if the 8CH mode is not available, you can try unplugging the unit from the AC wall outlet and waiting for at least three minutes. After the pause, reconnect the AC power cord and check the unit's operation. If the system still malfunctions, a system reset may clear the problem. The 8CH may not be available according to the user manual. You need to contact Harman-Kardon customer support.

Check the power button first. It is Ok ? It may require replacement.

i recommend you turn off the receiver and then disconnect it from the power outlet for a few minutes

headphone is audio out for your headphones not audio in. you will need to buy mic pre amp and use output to aux or preferably tape in RCA connectors.