20 Most Recent Koss KS2503 System Questions & Answers

Often it is to do with the kind of sound that is being outputted by the DVD player. If the sound for example is set to produce dolby 5.1 and you don't have a suitable decoder it will be very low.
Check the sound settings of both your DVD player and sound system.

Koss KS2503... | Answered on Dec 09, 2017

I had this MSG 04 problem. Opened the player up. Messed around. Figured out that the 5-disc tray was hanging up a little during the initialization. The issue is that the tray screws into and rotates around a stand-up beam. On the underside of the tray are gear teeth which are spun by a gear on the main unit underneath. The real culprit is the stand-up beam in the very middle. It is too long. The fix is to first try just tightening the middle black screw holding the tray onto the stand-up beam. If this tightens and MSG 04 goes away, you're done. If it does not tighten at all or much at all, then remove the screw (actually a bolt) and using a razor or sharp blade, scrape the top 1/4 millimeter off the stand-up beam. Apply some grease around the beam and on top. Note, you may have to remove the tray to do all this. If so, that is the most tricky part. Carefully lift on the tray on the front side as you rotate it. Try to free a disc circle edge over the top of the front DVD cover and free the tray. To re-set the tray, put it on the stand up beam with the front side of the tray slanted up and slowly rotate while setting it in and down. After re-seating the tray, screw the bolt down but do not tighten all the way. Tighten it enough to allow rotation and enough to rid the msg 04 problem. I shaved my stand-up beam and have never seen a MSG 04 since.

Koss KS2503... | Answered on Jan 11, 2013

Usually a fuse blowing immediately means there is a short in the amp somewhere.

Koss KS2503... | Answered on Jan 04, 2013

F501 F4AL/250VAC just tried it, blew again as soon as I plugged it in.

Koss KS2503... | Answered on Jan 04, 2013

I'm not sure if we have the same problem here but it's worth giving it a shot. I had this problem too and when I opened the unit, a blown fuse welcomed me. Replaced it, it worked fine, until it was blown off again. I don't know if is a common problem or not, but I guess it just can't handle the entire system.

Koss KS2503... | Answered on Aug 31, 2011

I have emailed the manufacturer for you. Please provide me with your email at cardenderek@yahoo.com and i will get back to you as soon as they get to me.


Koss KS2503... | Answered on Aug 23, 2011

For Operating Guides or Service Manuals try


Koss KS2503... | Answered on Jul 23, 2011

need a remote and an owners manual for this unit

Koss KS2503... | Answered on Jul 23, 2011

It's toast, and so will your house be if you keep feeding it fuses.

Koss KS2503... | Answered on Jan 10, 2011

The problem is that your center channel is not functioning correctly.  Dialogue is typically routed to the center channel only in 5.1, so if you don't have a working center channel all you will get is sound FX and background sound.
Go through all your settings, verify that they are correct.  Verify that your center channel is working properly, and wired to the correct output.
Test the center channel speaker and I feel confident you will find something amiss.

Koss KS2503... | Answered on Dec 05, 2010

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suddenly blows fuse as soon as plugged

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