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Alpine MRP-M2000
Alpine MRP-M2000
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Old 30th January 2016, 07:33 AM   #1
S Merlington is offline S Merlington  United States
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Default Alpine MRP-M2000

Anyone have a service manual for this amp?

I'm need the value of R348 and Q311
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Old 30th January 2016, 08:47 AM   #2
Perry Babin is offline Perry Babin  United States
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Can you read the markings on it or Q304?

Last edited by Perry Babin; 30th January 2016 at 09:01 AM.
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Old 30th January 2016, 09:33 AM   #3
S Merlington is offline S Merlington  United States
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Q304 is marked 1ww
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Old 30th January 2016, 09:56 AM   #4
Perry Babin is offline Perry Babin  United States
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The transistors that I'm seeing for the 1W mark are all high voltage, low current. Not what I'd expect for a regulator.

Can you measure the DC voltage across the collectors of those two transistors?
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Old 30th January 2016, 11:29 AM   #5
S Merlington is offline S Merlington  United States
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Q311 is missing ..

Q304 is still intact ..

Do you want the voltage on q304?
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Old 30th January 2016, 11:37 AM   #6
Perry Babin is offline Perry Babin  United States
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Yes. You can measure from collector to ground of across the collector pads for the two transistors.
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Old 30th January 2016, 11:53 AM   #7
S Merlington is offline S Merlington  United States
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From ground to collector of q304 : -54.3

Measured directly across collectors I get 66.8

Last edited by S Merlington; 30th January 2016 at 12:11 PM.
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Old 30th January 2016, 12:14 PM   #8
Perry Babin is offline Perry Babin  United States
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Try an MMBTA06.

The resistor you asked about is a 100k.
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Old 30th January 2016, 12:39 PM   #9
S Merlington is offline S Merlington  United States
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Replaced the resistor and Q304

Something still isn't right ..

Both regulators were defective and they are out of the amp right now..

On the input legs for the regulators what voltages should i see?

I'm getting pulsing voltages from 0.00 to 2.00
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Old 30th January 2016, 12:54 PM   #10
Perry Babin is offline Perry Babin  United States
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Q311 is the one you should have replaced with the 06. Is that what you did?

Are these the regulators that you're referring to or IC104/5?
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