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Car Forum / Driving, Maintenance, Tuning / Car Audio / December 2004Need help with Amplifier....
I've got an Alpine 3555 4 channel amp. Channels 1 & 2 drive a set of components up front and channels 3 & 4 are bridged and drive a 10" sub. Sometimes when the volume is turned down low channel 2 goes out. When I turn up the volume I can hear some static out of channel two then it will come on and play without problem. I know it's not the HU or the interconnect cables, I'm confident the problem is with the Amp. Help! Try tapping on the amp heat sink while it's on to see if the problem comes and goes... you have the classic symptoms of an intermittent connection in the amp, and cracked solder connections on an older amp like that would not be unusual. JD >I've got an Alpine 3555 4 channel amp. Channels 1 & 2 drive a set of >components up front and channels 3 & 4 are bridged and drive a 10" sub. [quoted text clipped - 4 lines] > > Probably needs some switch cleaner sprayed into the volume control pot. Regards, Stefan > I've got an Alpine 3555 4 channel amp. Channels 1 & 2 drive a set of > components up front and channels 3 & 4 are bridged and drive a 10" sub. > Sometimes when the volume is turned down low channel 2 goes out. When I > turn up the volume I can hear some static out of channel two then it will > come on and play without problem. I know it's not the HU or the > interconnect cables, I'm confident the problem is with the Amp. Help! > Probably needs some switch cleaner sprayed into the volume control pot. > > Regards, > Stefan Available @ Radio Shack? Thanks... the Nay Sayer Probably, but caveat emptor... before you spend any money, try spinning the gain control up and down a few times slowly while the systme is on at low volume. You'll find out pretty quick of that's where the problem is (personally it doesn't seem like the right symptoms to me but not impossible). Second, spraying the control surfaces tends to be a short-term fix plus some amps have sealed pots which won't give you anywhere to spray the cleaner. JD > > [quoted text clipped - 12 lines] > > Ok, while taking your advice and slowly turning the gains up and down I found the problem. Next to the gain control is a three way switch that controls the amp's built in crossover(off, lp, hp). When I tapped it with my screwdriver it produced the static I've been hearing. Should I hit it with some spray cleaner? the Nay Sayer Probably, but caveat emptor... before you spend any money, try spinning the gain control up and down a few times slowly while the systme is on at low volume. You'll find out pretty quick of that's where the problem is (personally it doesn't seem like the right symptoms to me but not impossible). Second, spraying the control surfaces tends to be a short-term fix plus some amps have sealed pots which won't give you anywhere to spray the cleaner. JD Nay Sayer wrote: Probably needs some switch cleaner sprayed into the volume control pot. Regards, Stefan Available @ Radio Shack? Thanks... the Nay Sayer Yes, but look for a contact cleaner that also lubricates or your patch won't hold up for long. While you spritz it, move the switch back and forth so the cleaner has a chance to get onto the carbonized contacts. Worst case, you can carefully unsolder and dismantle the swotch and clean it more thoroughly, or tack jumpers across the PCB to connect the contacts you're using in your particular configuration. JD > Ok, while taking your advice and slowly turning the gains up and down > I found the problem. Next to the gain control is a three way switch [quoted text clipped - 32 lines] >> >> > Yes, but look for a contact cleaner that also lubricates or your patch > won't hold up for long. While you spritz it, move the switch back and > forth so the cleaner has a chance to get onto the carbonized contacts. > Worst case, you can carefully unsolder and dismantle the swotch and > clean it more thoroughly, or tack jumpers across the PCB to connect the > contacts you're using in your particular configuration. > > JD Thanks again to everyone who chimed-in. Got some contact cleaner from Radio Shack with lubicant. Sprayed that stuff on the inside of my amp and it left an oily film all over the place. Went to Ace Hardware and got some contact cleaner w/o lubricant to clean up the mess made by the Radio Shack stuff. Put the amp back in my truck and so far so good. Hopefully it wont blow up. Thanks again... the Nay Sayer |
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