So I Took Apart My Alpine MRD M1005...need insight please!

onyxaltezza · 3rd May 2010, 08:11 AM

Before you say I told you so, yes, I bought this amp used off Craigslist about 2 months ago. Bad idea to not test it on the spot, I know...

I didnt have a chance to throw it in til yesterday, but when I ran all the cables, etc, it powered up, digital display came on, but no power to subs. The controls all worked allowing me to 'hypothetically' adjust gains, etc, but no power at all.

The sub is a working sub, I tested it before and after this amp with a different amp.

I knew something was loose so I popped it open and put the fan back in place, one of them was kinda loose.

Tested it again and same results, no power.
Here is what I found upon closer examination, you can see the burn marks on the side, but on the board itself there is NO sign or burning or any marks at all. Please advise me on what you think the issue might be, and what I would need to replace:

No, the dark marks on the corners of the pic below are not burn marks, it is paint from when I recoated the outside of the amp, none got onto the board. I coated it the day I got the amp, 2-3 months ago.

What you guys think?

Thanks in advance,

-Aaron

Perry Babin · 3rd May 2010, 01:35 PM

It's likely that it failed and someone replaced the blown FET (it appears that only one was replaced - from what I can see on the photos).

Does it try to power up or go into protect mode?

brandes.cm · 3rd May 2010, 01:37 PM

Check the setup menu's, MRD-M300 can be muted in menu 9.

onyxaltezza · 3rd May 2010, 07:29 PM

It actually powers up! I can adjust gain, LPF, etc, just no sound...
I dont see any mute control though..

-Aaron

onyxaltezza · 4th May 2010, 01:21 AM

Quote:

Originally Posted by brandes.cm

Check the setup menu's, MRD-M300 can be muted in menu 9.

Hmm how do I access this menu that you speak of buddy?

-Aaron

brandes.cm · 4th May 2010, 02:55 AM

The mrd m300 had a display you could access and change all the parameters. Menu 9 on that one was a mute function. The M1005 doesn't show anything in the manual, though.

Does your display read anything?

Manual located here:
http://a248.e.akamai.net/pix.crutchf...500MRDM605.PDF

onyxaltezza · 4th May 2010, 03:20 AM

Whoa, thanks for that PDF, doesnt seem like its too similar to the one I have though.

I dont have 9 menus, I have about 4. When I press the Menu/Mode button, I can cycle through 4-5 menus, these include:

Temperature(in Celcius)
Channels
Gain
LPF
And when I click the last one it says "OFF"...

Thanks for the help so far fellas.

-Aaron

3rd May 2010, 08:11 AM	#1
onyxaltezza diyAudio Member Join Date: May 2010	So I Took Apart My Alpine MRD M1005...need insight please! Before you say I told you so, yes, I bought this amp used off Craigslist about 2 months ago. Bad idea to not test it on the spot, I know... I didnt have a chance to throw it in til yesterday, but when I ran all the cables, etc, it powered up, digital display came on, but no power to subs. The controls all worked allowing me to 'hypothetically' adjust gains, etc, but no power at all. The sub is a working sub, I tested it before and after this amp with a different amp. I knew something was loose so I popped it open and put the fan back in place, one of them was kinda loose. Tested it again and same results, no power. Here is what I found upon closer examination, you can see the burn marks on the side, but on the board itself there is NO sign or burning or any marks at all. Please advise me on what you think the issue might be, and what I would need to replace: No, the dark marks on the corners of the pic below are not burn marks, it is paint from when I recoated the outside of the amp, none got onto the board. I coated it the day I got the amp, 2-3 months ago. What you guys think? Thanks in advance, -Aaron

3rd May 2010, 01:35 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's likely that it failed and someone replaced the blown FET (it appears that only one was replaced - from what I can see on the photos). Does it try to power up or go into protect mode? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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3rd May 2010, 01:37 PM	#3
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Check the setup menu's, MRD-M300 can be muted in menu 9.

3rd May 2010, 07:29 PM	#4
onyxaltezza diyAudio Member Join Date: May 2010	It actually powers up! I can adjust gain, LPF, etc, just no sound... I dont see any mute control though.. -Aaron

4th May 2010, 02:55 AM	#6
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	The mrd m300 had a display you could access and change all the parameters. Menu 9 on that one was a mute function. The M1005 doesn't show anything in the manual, though. Does your display read anything? Manual located here: http://a248.e.akamai.net/pix.crutchf...500MRDM605.PDF

4th May 2010, 03:20 AM	#7
onyxaltezza diyAudio Member Join Date: May 2010	Whoa, thanks for that PDF, doesnt seem like its too similar to the one I have though. I dont have 9 menus, I have about 4. When I press the Menu/Mode button, I can cycle through 4-5 menus, these include: Temperature(in Celcius) Channels Gain LPF And when I click the last one it says "OFF"... Thanks for the help so far fellas. -Aaron

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