Audiobahn a275hct - diyAudio
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Old 30th June 2010, 08:48 AM   #1
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Default Audiobahn a275hct

Sorry for another thread. I know audiobahn is junk. Either way I got this amp from a friend for free like new. Thing is it won't work. Powers up with the blue led's coming on and the fans but that is it. The vu meters don't work or the white backlight to them. The status light comes on red upon coming on to where it then goes out. I believe it is suppose to turn blue.

Not sure. It just doesn't play sound. No thump from the subs or anything. I tore it apart where nothing is burnt or smell like it so I am at a loss.
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Old 30th June 2010, 03:19 PM   #2
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You'll need to post the DC voltage on the 16 pin driver IC. Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage. Have all transistors tightly clamped to the heatsink. You should insert a 15 amp fuse in the B+ line before you begin measuring the voltage.

IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
Attached Images
File Type: gif pinconfig494-01.gif (4.8 KB, 36 views)
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Old 30th June 2010, 08:57 PM   #3
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Sorry I'm not to into fixing amps. I can solder new stuff in no problem. What is the 16 pin driver? This morning being bored I kept looking and noticed corosion in a few places. Sorry I don't know the technical names but one of the wire wound things. Had corosion on the left one. Then I am guessing capacitors not the black ones but the big 4 that says audiobahn on them. The one on the left 2nd over was the same way. With the top kind of bubbled along with the other left had a bubble in the top.

Not sure if that would do it or not but I desoldered it. Only take a min to put it back on.
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Old 30th June 2010, 09:44 PM   #4
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Please read the Basic Car Audio Amp Repair page (link below).
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Old 1st July 2010, 01:42 AM   #5
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Ok will do. Ok I guess what I am talking about is the transformer. It is way bigger than the black caps. Not sure if a good way to tell if they are bad is by the tops are bulged or not. But still reading.

Also I can use a multimeter and such just not sure on all the parts.

Last edited by 2fast4u88; 1st July 2010 at 01:51 AM.
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Old 1st July 2010, 02:20 AM   #6
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Here is some pics. You can see where I took the I actually guess transformer out. I tried to get a pic of the corosion but I wiped some off. The audio jack piece isn't pictured as it just plugs in. Along with the vu meters just plug in.

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Old 1st July 2010, 02:22 AM   #7
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Here is some more pics. Then where it looks to have got hot. Which I am going to guess from to low of ohm's.
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Old 1st July 2010, 02:28 AM   #8
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The part you removed is a capacitor.

What appears to have overheated?
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Old 1st July 2010, 02:33 AM   #9
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Ok that is what I thought well the top is bulged on it and the one right beside of it.

As for overheated. I know the amp never did that when my friend had it. But was saying due to all the melted brown glue on the bottom. Not sure if that is a give away or not. As I thought someone told me that at one time.
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Old 1st July 2010, 02:41 AM   #10
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The cheap fixative they use around the capacitors breaks down and turns brown. You should remove that fixative. It becomes conductive and corrosive and can cause all sorts of problems.
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