Question about Alesis M1-Active MkII Main / Stereo Speaker

1 Answer

Fuse blows found bad parts on the board...

Hi, My alesis M1 Active MK2 Monitor went out on me.. The fuse blows when I replace it. After a closer look I found U-1 whit a hole burned in it, R=11 burned mildly, Q-3 blown open, Q--4 cracked, D-16 burned, and also Q-1 with a hole burned in it. I found these by looking at the board with a jewelers loupe. Does anyone know if the transformer (T-1} might be bad too? Or anything else for that matter that may have been over looked? I live overseas where there are no repair shops. I'd like to fix this monitor my self if at all possible, other wise I will throw it away.

I need help crossing over the numbers on the parts too, I went to didi key . com and got really confused... some of the parts are not even recognized there.

I think I can do this job if I can just get all the appropiate part numbers and the names of the parts so that I can order them.

Thanks so much,

Tim


Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 15 Answers

Hi, Email Alesis and ask very nicely and they might email you a copy of the schematics, which also has the parts listed, etc.

I had the problem of the blinking LED's a few years back, really odd, and fixed it, and now I do a search and all I can find is people with the same problem or similar. Depending on how bad the damage is, it should be repairable unless its done extensive damage to the PCB board. PCB boards are still available to buy, dont bin it, they are too good to be binned ;)

Posted on Jun 02, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Hi one of my alesis m1 520 speakers has a fault . it powers up ok but theres hardly any sound coming out . you can hear it but its very low


Try reversing cables between speakers just to make sure it's not cable or source. If it is a bad soaker, you'll need to contact Alesis for a local service center near you. Check w/ Guitar Center also, they have access to service.

Mar 10, 2011 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Alesis M1 Active MKII Don't get power / Blue light is off


Sure they don't have power? Light breaks all the time on those things. If no power still, open it up and find out if there are any loose connections from the power leads. Bad power cable?

Mar 16, 2010 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Alesis M1 Active Mk2 Speaker won't Power Up


Hi, This is usually the Capacitor C8 on the powerboard it usually bulges and pops, its becuase its right next to a resistor which gets very hot and sometimes puts the capacitor into meltdown, yours might have gone past that stage but this is worth a look; http://www.neufeld.newton.ks.us/electronics/?p=232

Hope this helps

Cheers

Steve

Apr 14, 2009 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Alesis m1 mk2 active emits low pitch hum and does not work


You need to take a closer look really, see if anything on the power supply board inside has melted, burned, popped, etc.

Mar 13, 2009 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Need a M1Active MKII diagram


Hi, You will need to contact Alesis direct and they will decide whether to email you a copy of the schematics, as they are copyrighted, etc.

Dec 15, 2008 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Mk2 speakers


is it the m1 active mk2???if so try changing the fuse in the power supply..i know my ones the light started to flash on one,i switch it off with a fan on it for 20 mins and it works again..so i just leave it on now.

Oct 17, 2008 | Alesis Monitor One Mk2 Speaker

2 Answers

M1 Active Mk2 blows fuse as soon as it's turned on., I bought them second hand so not under warranty. Anyone have any ideas if this is easy/expensive to fix or should I cut my losses and get a new pair ?


hi i have exactly the same problem with mine .. there is some yellow **** like glue splattered around some parts and it looks like its meant to be there.. however round the large black capacitors its turned a darker yellow with spots of orange in it.. also one of black capcitors also apears to be buldgeing out the top a little bit like its expanded.. i dont know if this is the problem?

do u have any idear on where we can take them to get fixed and if its going to cost a lot of money? i live in leicestershire uk

Oct 07, 2008 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Alesis Monitor Problem


Hi Mate, Im no electrician so Im not 100%, basically I think it would last but it wouldnt be a long term fix as it really needs to be 105c.

Cheers

Mar 28, 2008 | Alesis M1-Active MkII Main / Stereo...

6 Answers

Alesis M1 ACTIVE MONITOR amp circuitry board is ticking


The flashing blue LED and loss of sound on the Alesis M1 powered monitor is caused by failure of capacitor C8 (220uF, 35V) on the power supply board. It dries up due to its proximity to resistor R4 (47K, 2 W) which gets very hot. This is a design fault.

Remove the power supply board (4 corner screws and 2 mains connector screws) and disconnect the two plugs. Carefully desolder C8 and replace it. Its value is not critical (220 to 470 uF will do) but it should be a 105 deg. type, preferably at 50V.

Remove R4 and replace it with a similar resistor with its leads bent so that it is nowhere near C8, otherwise the fault will return. One end may be connected to one of the existing R4 solder pads (furthest from rear of board), and the other to the top end of resistor R3. Check that you have connected it correctly by inspecting the PCB tracks.

Replace the board and all screws and plugs before testing.

Nov 04, 2007 | Alesis M1-Active MkII Main / Stereo...

5 Answers

Left speaker LED flashing, woofer and tweeter clicking...


The flashing blue LED and loss of sound on the Alesis M1 powered monitor is caused by failure of capacitor C8 (220uF, 35V) on the power supply board. It dries up due to its proximity to resistor R4 (47K, 2 W) which gets very hot. This is a design fault.

Remove the power supply board (4 corner screws and 2 mains connector screws) and disconnect the two plugs. Carefully desolder C8 and replace it. Its value is not critical (220 to 470 uF will do) but it should be a 105 deg. type, preferably at 50V.

Remove R4 and replace it with a similar resistor with its leads bent so that it is nowhere near C8, otherwise the fault will return. One end may be connected to one of the existing R4 solder pads (furthest from rear of board), and the other to the top end of resistor R3. Check that you have connected it correctly by inspecting the PCB tracks.

Replace the board and all screws and plugs before testing.

Oct 27, 2007 | Alesis Monitor One Mk2 Speaker

Not finding what you are looking for?
Alesis M1-Active MkII Main / Stereo Speaker Logo

624 people viewed this question

Ask a Question

Usually answered in minutes!

Top Alesis Speakers & Subwoofers Experts

 Grubhead
Grubhead

Level 3 Expert

4567 Answers

Are you an Alesis Speaker and Subwoofer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...