Harmon Kardon HK990 - powers up but no sound output to speakers

SOURCE: harmon kardon avr 25 II

hey i also had this problem, i don't know the name of these but they are basically plugs that you have to block output from the front rear and center speakers of the white/red cables... sry for bad description but its on the left side when looking at the back of the receiver, while all of the other speaker wires should be hooked up to the right with the twisting knobs... it took me forever to find this out but yeah it was a simple fix

SOURCE: Harmon/kardon computer speakers bought on ebay missing power adaptor

Get the speakers with you walk a distance for your Nearest electrical shop as quickly as possible and your roblems will be solved...

SOURCE: need a replacement power cord for harmon kardon sound sticks II

Hi
please look at your dameged power adabtor suplay it gives you all specification ,like, voltage, amp nad so on, and go to electornice retailers like radio shack ,and............ you can find replacment for it .
make sure have your old one with you , or manual book that came with your spekers.
please let us know if need more assistanse.
Thanks:Marco

SOURCE: need a replacement power cord for harmon kardon sound sticks II

its not that expensive for a power cord. they are running on 12v so you go and buy a 12v power supply with a jack that fits the speakers or you can just find a power supply at home if you have one that is 12v

SOURCE: harmon kardon avr 25 ii

I upgraded my HK AVR 20II and ran into the same problem when I tried to hook the old unit up out in my garage.

Luckily I remember that on the rear there is a pre-out RCA port (L/R) and a Main-In port that are intended to be to/from an equalizer/amplifier. These come jumpered out of the box, but I had been using an equalizer so the jumpers were long lost.

Assuming you also have no amp/eq you are using, just connect the Pre-Out to the Main-In using a standard M/M RCA cable and you will be in business. (turn the volume down first!)

Good luck.