I haven't actually checked the output transistors but that would make sense that if something were shorted and drawing too much current, the voltage supply for the whole amp would drop causing it to imitate the signs of 'motorboating' like it says in the manual. You can't simply set both fully counter-clockwise to reduce the biasing while working on it like you can for other amps. You will increase the bias on the other channel by turning the bias counter-clockwise. This means that you will increase the bias on one channel by turning the bias pot clockwise. I think the channel layouts in this amp are mirror images of each other. You could try cleaning and readjusting the bias pots to see if that helps. In these amps, the bias pots failed fairly often. I've posted some pictures on flickr here: I have very little amp repair experience but I do have good general electronics knowledge, soldering skills, and access to power supplies, signal generators and o-scopes.Īny advice is most appreciated! I'm assuming that you've checked the output transistors and none are shorted. The problem remained so before I replace anything else I wanted to consult the forum. My intuition told me it was a capacitor issue at first since it is a bit aged and electrolytics like to lose their potency over time, so I replaced most of the larger ones. In the process the amp draws a lot of current and gets very warm. A few months ago, that bump sound started happening more frequently, like the amp was turning itself off and on every so often.Īfter time, that got more and more frequent until now when it just sounds like a continuous ripping sound anytime it's powered up. I never thought anything of it because lots of audio systems make little pops or clicks when they power up and it seemed totally normal. As long as I've had it, whenever the amp would power up, the sub would make a little 'bump' sound. The Remote connection of the amp was connected to the remote line of my stereo, so when I turn on the stereo the amp would turn on as well. I used it for several more years with no problems until a few months ago when it started acting up. Hey all, I have a Coustic AMP190 that I got from my dad a number of years ago after he got some good use out of it. Mainly including Instruction Manual in one language English. AMP-401DB Car Amplifier pdf manual download. Coustic Classic Series Amplifiers Model AMP-401DB, AMP-801DB OWNER'S MANUAL. View and Download Coustic AMP-401DB owner's manual online. Browse and Read Coustic Amp 190 Manual Coustic Amp 190 Manual One day, you will discover a new adventure and knowledge by spending more money.
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