Post by dobrykamil on Nov 23, 2018 12:45:53 GMT -5
I've got above model and it works in general, but instantly after powering on, subwoofer produces very annoying crackle and popping sound. I believe this is another, common issue with this model. Most information on the internet is regarding hum, buzzing sound etc. caused by dodgy +15V, -15V rail caps. I've managed to repair different MA subwoofer with exact symptoms in the past - BXW10. Problem is, amplifier for RSW12 comes with two IR2110 mosfet drivers working in full bridge circuit.Long story short, I've replaced both bootstrap caps (that was the case with BXW10) but it didn't help at all. I don't have SM yet, but I've emailed MA support team, so hopefully they'll come back to me soon. I believe problem is caused by one of the caps, because popping sound goes away (not entirely, becomes less frequent) once the unit warms up a bit. Has anyone came across with this problem before?
Last Edit: Nov 23, 2018 12:48:07 GMT -5 by dobrykamil
mastertech: Merry Christmas to you too. Not many holiday people around any more.
Dec 26, 2018 14:37:50 GMT -5
stridsvognen: Merry christmas everybody...
Dec 24, 2018 19:10:58 GMT -5
mastertech: Sounds nice. Would love to have many more pictures.
Oct 20, 2018 20:31:04 GMT -5
greg1292: Greetings from Denmark. Lots of ideas knowledge and bucket list. Gabor boards looking very nice indeed
Oct 20, 2018 16:38:34 GMT -5
kevin5418: Anyone has the Velodyne hgs12bg MPS board schematic ? thank U
Oct 6, 2018 0:58:34 GMT -5
mastertech: According to the SM ic711 must be installed with the firmware already in it. It can then later be upgraded. The correct ic is around 50 dollars. If you installed a blank ic it will not work.
Aug 19, 2018 20:01:39 GMT -5
ralph: Hello mastertech, sorry for the delay, if I replaced that IC, I was with short circuit, blocked the 3.3 volt regulator, put a new one but still do nothing, what could I do? Thanks for the reply
Aug 18, 2018 21:48:51 GMT -5
mastertech: Did you replace ic711?
Aug 12, 2018 18:55:42 GMT -5
mastertech: Just to clarify you replaced ic711 (STM32F101ZG), correct?
Aug 10, 2018 20:58:16 GMT -5
ralph: Hello, Mastertech, I'll send it to you
Aug 10, 2018 18:58:46 GMT -5
mastertech: I have no idea on the context of what you posted. Link me the manual and I can look it over.
Aug 8, 2018 20:05:37 GMT -5
ralph: This is what the manual says:
Aug 8, 2018 19:44:59 GMT -5
mastertech: Nope. That is only to update a preprogrammed CPU. It needs basic firmware just to function. Without that it does nothing. You most likely purchased a blank CPU. The service manual would be more specific but I do not have one for that model.
Aug 8, 2018 19:35:18 GMT -5
ralph: Hi, mastertech thanks for responding, but still without firmware Denon should appear information on-screen, so then update it via USB?
Aug 8, 2018 19:25:45 GMT -5
mastertech: Most likely has firmware.
Aug 8, 2018 18:13:28 GMT -5