Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Ive given up wasting more time on this crap and im selling mine. One is working, one with flashing led.
Bought a pair of Adam Audios instead.
filth
Member
Last Activity: 05-05-2021, 01:04 AM
Joined: 01-22-2021
Location: NRW
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
I replaced C8 with the cap from the auction above. The LED is still flashing
What could I do / check next?...Last edited by filth; 02-09-2021, 09:49 AM.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Oh ok. I used this one:
[url]https://www.ebay.de/itm/5x-Elko-330uF-%C2%B5F-35V-radial/191824557945?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649[/url]
This one should be good?
[url]https://www.ebay.de/itm/2-Elko-Panasonic-FR-330uF-63V-Kondensator-105-C-Low-ESR-same-as-FM-854462/361307771860?hash=item541f9f13d4:g:A~0AAOSwv0tVZz08[/url]Re: Repairing Alesis M1 Active mk2 M...49.l2649[/url]Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Usually C8 needs to be replaced when the LED is flashing.
C8 was replaced by HonongX VEHT 105°C 330uF
Flashing came 3 Days afterwards.
I replaced C8 again, but its still flashing and clicking.
Any suggestions?Last edited by filth; 02-04-2021, 01:54 AM.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
What causes the blue flashing light? One of my freshly repaired monitors had a flashing led which went away on itself and is now working againLeave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
I used a BAV21 from my second board that is working.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
I got it working.
Swapped D5 from the working board and it powered on
Thanks a lot!...Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Any suggestions? Anything I could measure?...Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
R3 and R4 are showing 6kOhm. The value rises slowly to 30kOhm and above when measuring.
R5 5.6 Ohm
--> i get the same readings on the working board
Q3 & Q4 look good, compared with the working board i get the same readings between the pins.
D5 gives same reading on both boardsLast edited by filth; 01-28-2021, 01:01 PM.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
5-7 3.3v
5-8 0v
Im not an expert but from my guess Q6 and Q7 are next candidates for replacement?Last edited by filth; 01-28-2021, 12:19 PM.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
I thought maybe its possible to power the board with a lower voltage for safety reasons.
Give me a second, i will measure it...Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
With 220v connected and switched on? Can i remove the UC3844 and measure the voltages between the pins then?...Last edited by filth; 01-28-2021, 11:59 AM.Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
I replaced the UC3844N now. The LED is still dead.
To sum it up, what I replaced now:
- C6, C7 (390uF caps)
- C8
- 1uF Cap
- 1N4007 diodes
- 2x IRF840 (Q1 + Q2)
- 10 ohm NTC
- UC3844N
What should I check next?Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Thank you, Im ordering some. Will let you know!Leave a comment:
-
Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hi Guys,
i have two failed MK2 here. I was able to repair the first one (390uF caps and the 1N4007 diodes). But now im failing with the second one. Its just dead.
Im not an expert so I guess i need help.
I have already replaced C6, C7 (390uF caps), the 1N4007 diodes, C8 and the 1uF cap.
Also i replaced both the IRF840 (Q1 + Q2) and the 10 ohm NTC.
Its not switching on, no LED at all.
Can someone give me a clue what to do next? Does it make sense to replace...Last edited by filth; 01-22-2021, 11:14 AM.Leave a comment:
No activity results to display
Leave a comment: