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Old 13th January 2013, 04:47 AM   #1
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Default Alpine MRV-1505

Have this amp for repair.

When the phase switch is at 0 channel 1 works great channel 2 is dead, when the phase switch is at 180 channel 2 works great and channel 1 is dead.

Any ideas?
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Old 13th January 2013, 05:31 AM   #2
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Do you have audio on pin 8 of IC106 and IC206?
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Old 13th January 2013, 06:12 AM   #3
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I have audio on #8 of 206, but no audio on #8 of 106.
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Old 13th January 2013, 07:02 AM   #4
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Do you have audio on any of these points?

IC103 - pin 8
IC103 - pin 2
IC102 - pin 8
IC106 - pin 2
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Old 13th January 2013, 08:37 PM   #5
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Quote:
Originally Posted by Perry Babin View Post
Do you have audio on any of these points?

IC103 - pin 8
IC103 - pin 2
IC102 - pin 8
IC106 - pin 2
I have audio on all the pins except for pin #2 of IC106.
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Old 14th January 2013, 03:03 AM   #6
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Check the crossover, stereo/mono and phase switches for the defective channels with a multimeter to confirm that all contacts ion all positions are making proper contact. Attached is a photo of the 3-position switches. I'm assuming that you know how the 2-position switches work.
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File Type: jpg 3positionswitchposition210.jpg (39.3 KB, 36 views)
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Old 14th January 2013, 03:42 AM   #7
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OK the switches do not operate the channels seperately, the switches control both channels at once. I am not 100% how to check the switches with the multimeter.

The phase switch is the only switch that has any effect on the audio signal and its a 2 position switch.

I have posted a pic of the output section.
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File Type: jpg Alpine MRV-1505 001.jpg (1,012.7 KB, 34 views)
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Old 14th January 2013, 04:34 AM   #8
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Look at the image. The slider moves between the contacts. You should read 0 ohms between the two contacts with the slider touching them. Check all 3 switches.
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Old 14th January 2013, 04:36 AM   #9
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OK one more question, what are the 2 red LED lights that are lit up on the board in the output section?
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Old 14th January 2013, 04:41 AM   #10
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They are used as a voltage reference for a constant current source.
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