My center speaker does not work with harman kardon avr 40

$16 for a replacement remote. Generally any device the comes with a remote needs one.

It may be on Mute, or it is broken. Or you didn't connect speakers, or the signal is going to the wrong speaker output.

https://www.google.com/search?q=harman+kardon+avr+7000+remote+replacement

http://www.audioreview.com/product/amplification/a-v-receivers/harman-kardon/avr-7000.html

https://www.hifishark.com/model/harman-kardon-avr-7000

Manual and Service Manual

https://www.hifiengine.com/manual_library/harman-kardon/avr7000.shtml

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Hi, Try this. Hope this helps and I have the link here to the manual.
Processor Reset
If the AVr behaves erratically after a power surge, first turn off the front-panel
main
power switch and unplug the Ac power cord for at least 3 minutes. plug the cord back
in and turn the AVr on. If this procedure doesn't help, reset the AVr's processor as
described below.
note: resetting the processor will erase all user configurations, including speaker and
level settings, and tuner presets. After a reset, reenter all of these settings from your
notes in the Appendix worksheets.

To reset the AVR's processor:
1. press the front-panel Standby/on switch to place the unit in the Standby mode (the
Standby Indicator led will turn amber).
2. press and hold the front-panel Standby and memory/folder buttons until the reSet
message appears on the front-panel message display.
3. press the memory/folder button again to reset the AVr's processor.
If the AVr does not function correctly after a processor reset, contact an authorized
harman
kardon service center for assistance.
to locate an authorized service center,
visit our web site at www.harmankardon.com.

https://www.harmanaudio.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw409ee4c9/pdfs/AVR700NEW_OM_EN.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/laura_08254539050d64db

preout works with active speakers

Hi, Check the speaker wires that they are not shorting. Check the fuses on the back and then unplug it for 10 minutes. Good luck.

I am having the same problems with my AVR 254, did you find a solution?

Thanks

Do you get an indication on the display where the point of failure might be? It would show up on the LCD speaker diagrams just before shutting off.

Check the fuses - there may be one inside the box as well. May also be a bad transformer. You can get a multi-meter at Home Depot and lookup how to check the power at the transformer.