No output from MRP-M1000

BlackCivicHatch · 05:42 PM

I bought my Alpine MRP-M100 a few months ago, and its worked great until a few days ago.. I was playing music at normal listening levels (no where close to clipping). Amp wasn't getting any warmer than usual. The it just all together stopped playing. I pulled over to check it out. The light was still on, And the sound from the sub (Alpine Type-R 15 Dual 4ohm coils (2ohms at the amp)) sounded similar to coil rub. It was very quiet scratchy sound. The checked out all good.

Checked the voltage at the amp, Everything was good.
Removed the amp and took the back plate off, Everything inside looked good and tight. Only thing out of the ordinary was the leads on one transistor. they looked a little golden (as if they got a little warm).

I was referred here by "I am an Idiot"

spooney · 9th April 2010, 06:05 PM

your sub shouldn't be making any scratchy sounds. did you check the coils with a multimeter to verify that the sub is ok? or do you have another speaker you could hook up to the amp just to make sure it isn't the sub

BlackCivicHatch · 9th April 2010, 06:24 PM

Yes sir. The sub was the first thing i checked. Both coils checked good. Tried 2 speakers and another sub woofer. All made the same sound.

BlackCivicHatch · 9th April 2010, 06:26 PM

Yes sir. The sub was the first thing i checked out. Both coils check good.
Then i tried 2 other speakers and another subwoofer. All made the same sound

jol50 · 10th April 2010, 02:43 AM

Are you sure you are getting a signal from the RCA?

BlackCivicHatch · 10th April 2010, 12:37 PM

Yea. I even took it to my local car audio shop and he hooked it all up on his test bench. He used all Known good power, ground, RCAs, and speaker.
The sound that comes from the speaker Does go along with the Bass... Its just not (pleasant sounding) bass.
Very very quiet and scratchy/squealy

I Am An Idiot · 11th April 2010, 04:16 AM

Can you take a picture of the inside of the amp and post them here?

Perry, do you have picures?

First thing we need to do is make sure the power supply of the amp is working properly, Can you locate the Rectifier diodes? Probably a 3 legged device that looks like a transistor. They will be mounted to the heat sink. THey wil be connected directly to the secondary windings of the transformer. If you can locate them, power the amp up and check voltage from center leg of one device to the center leg of the other one. You are looking for DC voltage.

Perry Babin · 11th April 2010, 04:31 AM

I have absolutely no information/photos/anything on this amp.

BlackCivicHatch · 13th April 2010, 06:49 PM

I just took Several pics of the circut board. Hopefully at least one of them will help you help me.

BlackCivicHatch · 13th April 2010, 07:02 PM

MRP-M1000 pictures by BlackHondaCivicHatch - Photobucket

9th April 2010, 05:32 PM	#1
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	No output from MRP-M1000 I bought my Alpine MRP-M100 a few months ago, and its worked great until a few days ago.. I was playing music at normal listening levels (no where close to clipping). Amp wasn't getting any warmer than usual. The it just all together stopped playing. I pulled over to check it out. The light was still on, And the sound from the sub (Alpine Type-R 15 Dual 4ohm coils (2ohms at the amp)) sounded similar to coil rub. It was very quiet scratchy sound. The checked out all good. Checked the voltage at the amp, Everything was good. Removed the amp and took the back plate off, Everything inside looked good and tight. Only thing out of the ordinary was the leads on one transistor. they looked a little golden (as if they got a little warm). I was referred here by "I am an Idiot" Last edited by BlackCivicHatch; 9th April 2010 at 05:42 PM.

11th April 2010, 04:16 AM	#7
I Am An Idiot diyAudio Member Join Date: Mar 2007	Can you take a picture of the inside of the amp and post them here? Perry, do you have picures? First thing we need to do is make sure the power supply of the amp is working properly, Can you locate the Rectifier diodes? Probably a 3 legged device that looks like a transistor. They will be mounted to the heat sink. THey wil be connected directly to the secondary windings of the transformer. If you can locate them, power the amp up and check voltage from center leg of one device to the center leg of the other one. You are looking for DC voltage. __________________ If it ain't broke Don't fix it

11th April 2010, 04:31 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I have absolutely no information/photos/anything on this amp. __________________ 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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9th April 2010, 06:05 PM	#2
spooney diyAudio Member Join Date: Dec 2006	your sub shouldn't be making any scratchy sounds. did you check the coils with a multimeter to verify that the sub is ok? or do you have another speaker you could hook up to the amp just to make sure it isn't the sub

9th April 2010, 06:24 PM	#3
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	Yes sir. The sub was the first thing i checked. Both coils checked good. Tried 2 speakers and another sub woofer. All made the same sound.

9th April 2010, 06:26 PM	#4
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	Yes sir. The sub was the first thing i checked out. Both coils check good. Then i tried 2 other speakers and another subwoofer. All made the same sound

10th April 2010, 02:43 AM	#5
jol50 diyAudio Member Join Date: Nov 2007	Are you sure you are getting a signal from the RCA?

10th April 2010, 12:37 PM	#6
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	Yea. I even took it to my local car audio shop and he hooked it all up on his test bench. He used all Known good power, ground, RCAs, and speaker. The sound that comes from the speaker Does go along with the Bass... Its just not (pleasant sounding) bass. Very very quiet and scratchy/squealy

13th April 2010, 06:49 PM	#9
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	I just took Several pics of the circut board. Hopefully at least one of them will help you help me.

13th April 2010, 07:02 PM	#10
BlackCivicHatch diyAudio Member Join Date: Apr 2010 Location: Jefferson City, MO	MRP-M1000 pictures by BlackHondaCivicHatch - Photobucket

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