bukko Posted August 19 Share Posted August 19 Hi, like the title says, the CD/MP3 input causes a loud buzz which makes it unusable. Even if there is no sound being input, just plugging in a plug makes it buzz very loudly. It's been like this ever since I've had it (bought it used in 2011) and I've never taken it apart to investigate, but it would be great if I could use that input. Is this a known fault I can fix, or is it a case of someone checking out each component to see if it's faulty? Thanks for any help! Quote Link to comment Share on other sites More sharing options...
psarkissian Posted August 19 Share Posted August 19 Try a cable with plugs that have a tip/ring/sleeve on it (TRS with two insulator bands, not one),... stereo plugs. 1 Quote Link to comment Share on other sites More sharing options...
bukko Posted September 2 Author Share Posted September 2 Thanks for the suggestion. I tried that but it didn't make a difference, although the hum/buzz starts when only the amp-end is plugged-in. The cable seems to work ok elsewhere but I guess still might be faulty. I'll try to find another one. Quote Link to comment Share on other sites More sharing options...
bukko Posted September 4 Author Share Posted September 4 Tried a brand new cable, same issue. I'll have to delve a bit further... Quote Link to comment Share on other sites More sharing options...
bukko Posted September 4 Author Share Posted September 4 Ok, so I'm probably in the realms of "we don't recommend you do this" now, but I've removed the "head" section of the amp and I've pulled out the PCB with the input jack sockets on it. Now it's out I can see that the CD/MP3 socket is cracked; looks like it's been hit with something in the past. It's always buzzed while I've owned it so must have been a previous owner. It looks like an easy desolder/solder job so I'll see if I can find a replacement. Quote Link to comment Share on other sites More sharing options...
bukko Posted September 18 Author Share Posted September 18 UPDATE - I replaced the socket (eventually) - no difference. Exactly the same! I'm now thinking one of the capacitors on that small PCB could be shot. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted September 18 Share Posted September 18 If the power amp board failed, then it will need to go to an authorized service center for a proper troubleshoot and repair. Quote Link to comment Share on other sites More sharing options...
bukko Posted September 22 Author Share Posted September 22 I doubt the cost of that would be worthwhile. I have some experience repairing PCBs but not amplifiers. I'll take it as a challenge! The guitar input works fine, just the CD/MP3 input buzzes and - as I just noticed - so does the AUX input. Quote Link to comment Share on other sites More sharing options...
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