You are probably missing the +34V that comes from the PSU and goes to the amp module. Usually this problem is caused by bad capasitors on the PSU. If you look at the PSU's caps, you'll see that almost all of them have poppet at the top. These caps needs to be changed. It's not unusuall that 20 of them needs to be changed. These caps can also result in problem to adjust volume and problem to turn the product "on".
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: harmon/kardon computer speakers not working, light on, no sound
Hello frostyscoppe & micoh luv. I'm sorry to say that (like mine) they may have just 'packed in'! I had the same problem and contacted Harmon Kardon directly, They said there was a circuitry problem that couldn't be repaired and suggested I get the latest HK IIs. So I did and found these to be much more versatile and worth upgrading to. I thought my 'old' HDs were fine but sadly things aren't made to last like they used to be!!! If someone else is able to 'rescue' your originals I'd be very interested to hear their suggestions.
SOURCE: harmon kardon hk695-01,13 - Intermittent "gargling" noise
the noise is sometimes caused by dust in the volume control.
i would suggest blowing the dust out around the volume control if there is a manual control on the unit. use a small can of compressed air.. buy it at local walmart or computer store.
SOURCE: need a replacement power cord for harmon kardon sound sticks II
We used the power cord from our formerly used Motorola modem which ran computer, etc. and it works perfectly on our Harmon speakers! h
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