Question about Harman Kardon Audio Players & Recorders

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My Harman Kardon HS 250 has power (as indicated by the power light) however the front screen is blank and no sound is coming from the speakers?/

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It probably the capasitors in the power supply that gives you problem. Check if the top of the caps has a popped top, not flat like it should be.

Posted on Sep 28, 2015

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Possible that the microprocessor stage is not working and is not conveying any display to the unit.
remove the cover and check the 5Volt rail to the mP section. If the voltage is absent check on the 5 volt regulator.
If present and there is no life, then check for oscillatiion of the crystal, might need a CRO to confirm if the mP is working or the clocck signals are present, if data tranfer is present. If not mP is faulty.Take help to confirm and find a source, might be approach Harman Kardon.

Posted on Aug 30, 2010

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2 Answers

HOW TO RESET HARMAN KARDON AVR70


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

Jul 28, 2016 | Harmon Kardon Harman / Kardon Avr 70...

1 Answer

Hs 200 harman kardon stop working


Check the capasitors in the power supply. These often have a popped top surface, not flat like normal. These need to be changed. It can be as many as 10-15 bad ones.

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1 Answer

No sound out the front speakers Harman kardon HS 250


If everything else works fine, than change the 47uF/50V electrolytic capasitors in the power supply, primary side. There are only three of them. C505 is the one that's always bad, but change them all to be sure.

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1 Answer

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Ok this needs careful observation to determine this type of problem

Please unplug these speakers and plug it into an mp3 player and write back to me if the speakers work ok? I'll tell you more from there

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1 Answer

My Harman Kardon AVR 254 is not responding. None


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

Thanks

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