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possible blown channel on MS275 help?
Posted: Mon Oct 05, 2009 3:39 pm
by carter1010
Hello all,
I am new to the forum although I have been browsing on here looking for a ti 9 2 way comp set for some time now. Lots of great information and I am hoping some of you can help me.
I bought a MS275 off craigs recently. Mistake number one I know. Anyway, it has a blown channel. I see many internal fuses inside the amp. One of them is F3, the other is F2. F1 seems to be nowhere to be found. Could it be one of these fuses or do you think its more serious than that. Also, who would I send this amp off to for repair?
Thank you!
Posted: Mon Oct 05, 2009 4:24 pm
by Eric D
If one channel works, and the other does not, it is not related to the fuses. There are two fuses, one for the (+) voltage rail, and one for the (-) voltage rail. If the fuse goes, both channels would be affected.
Posted: Mon Oct 05, 2009 4:31 pm
by carter1010
after further inspection, I realized that although the white wire that is soldered to the RCA was touching, the solder joint was broken. I bet that was it. I will test it tomorrow.
Posted: Tue Oct 06, 2009 5:17 pm
by carter1010
That was not the problem. Any suggestions? Anyone know a good place to start in terms of repairing it myself or who to send it to?
Posted: Tue Oct 06, 2009 6:22 pm
by Eric D
Tell us more.
Does one channel work fine? Does the amp draw a lot of current? You should be able to put a 10A fuse in line with it, and power it on (no speakers or RCA connected), and it should not blow the fuse.
Posted: Wed Oct 07, 2009 3:29 pm
by carter1010
Ok, here is some more information for the experts out there.
I fused the power wire with a 10 amp fuse, used an ipod to RCA adapter to get the RCA input voltage. Low input voltage I know, but some interesting results nontheless.
when the amp is set to FLT ground there is output from both channels
10 volts on the left channel
14 volts on the right channel
When the amp is set to Com ground there is no output on the left channel.
14 volts on the right channel
0 volts on the left channel
Any ideas?
thank you,
Brian
Posted: Wed Oct 07, 2009 7:11 pm
by Eric D
Those switches do go bad. They get corroded and no longer conduct. Your problem may be as simple as a bad ground switch.
Posted: Thu Oct 08, 2009 4:48 am
by deathcloud
So I was going to buy that MS275 from you. Were you going to tell me that it has a bad channel or just sell it to me
Posted: Thu Oct 08, 2009 7:29 am
by carter1010
I just found out about the bad channel. When it was in fl mode the channel worked it wasn't till I switched it to com that the problem became apparant. I am going to have it fixed and then sell it.