Question about Dell HK395 Computer Speakers

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HK 395 teansformer

What is the output voltage of the transformer in the HK 395 subwoofer system?

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Posted on Sep 15, 2008

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Which is the output voltage of transformer (the part number is SY-76D30085B 150e7630085)? Thanks if you could help me. Regards Jean-Louis


If you are looking for the specifications for this transformer to replace it, then don't bother. Makers like transformers replaced with exact parts by them, for safety reasons. You have the part number just find out who has it, or contact the maker for a supplier.
If you just want to know the voltage a multi-meter will tell you that.

Jan 21, 2016 | Mordaunt Short MS-308 Subwoofer

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What is the output voltage of the mains transformer for the Onkyo SKW 770 Subwoofer amplifier? I need the specs so I can have a custom replacement toroidal transformer made. Thank you kindly in...


It would seem that a call or email to the mfr, should be your first move.
Are you certain that the transformer is at fault?
These normally outlive most everything else-

Mar 03, 2015 | Onkyo Audio Players & Recorders

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MTX Lolita Sub amp defective power transformer (open primary) What's the transformer voltage?


Without Knowing the Output Chip or transistor Numbers, I don't know but Most 100 Watt anps use 60 to 70 Volt Centertap Sacondarys. Also if You Take the Cover off The Transformer you will find a Thermal Fuse in the Primary. I have bypassed the Thermal Fuse and went with a external fuse, Go for it.

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395 code


395 Development output abnormal A development bias leak signal is detected. High voltage output to the development unit exceeded the upper limit (65%) for 60 ms. High voltage supply board defective Poor connection at the development bias terminal Poor connection at the high voltage supply board

if you change the developer and initialize'it it should work,if not do the above.

Jun 29, 2010 | Ricoh Aficio 1045 Black and White Copier

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395 Code in 1035????


395 Development output abnormal A development bias leak signal is detected. High voltage output to the development unit exceeded the upper limit (65%) for 60 ms. High voltage supply board defective Poor connection at the development bias terminal Poor connection at the high voltage supply board

if you change the developer and initialize'it it should work,if not do the above.

Jun 18, 2010 | Ricoh Aficio 1035 Copier

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UGH! HK 395 speakers not working on my Dell XPS 400 computer since A new hard drive was installed. I can tell they turn on, but my computer does not recognize them. Dell directs me to Harmon Kardon and...


How old are the speakers. They will power on, however, when transformers get old what will happen is the voltage will rise above tolerance and damage parts of the motherboard.

Get this checked out with a multimeter first. The rating is on the transformer. You should not need any drivers to get basic sound out of them.

If they are in tolerance, then go to the sounds applet and see if there is a selection of devices you can use. Sometime you have a video card that also will do audio.

Jul 27, 2009 | Office Equipment & Supplies

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Voltage on subwoofers input


Is the subwoofer a self-powered unit? If yes, it would have a minimal voltage showing on a meter. If the input is a line input, it would not have a problem taking in a line output (not speaker - never!) from your receiver. If the only output you have from your reciever is a speaker out, then purchase an L-Pad type speaker to line matching transformer. You can also take one of the input channels coming from the source and Y out a side to the sub pre receiver, but you then you would need to be able to adjust levels on the subwoofer independently from the receiver.

Jul 24, 2009 | Audio Players & Recorders

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Dell HK 395 Speaker System - Need Circuit Diagram Download


1.  Check the orange multi-pin connector the sufwoofer for a broken or bent pin.  If there is a broken pin you can bypass it by cutting open the cable jacket and tap onto the affected wire with a 6 inch or so jumper, and then attach a jumper to the appropriate point inside the subwoofer.  Pass the subwoofer jumper out of the case (drill a small hole) and connect it to the jumper you added to the cable.

2.  Try wiggling and rapidly rotating the volume control.   There are reports this control may become a problem as it ages.

3. I haven't been able to find a schematic.  My only recourse was to google the output amp and the 2 op-amp packages for data sheets.  They are readily on the internet.  Then I laboriously traced out the stereo paths.  I found that red and black fine tip felt pens were helpful in marking out the signal paths through the circuit boards.

Nov 21, 2008 | Dell HK395 Computer Speakers

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