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13th July 2011, 11:03 AM
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#1 |
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diyAudio Member
Join Date: Aug 2009
Location: Detroit
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MTX 2300x
I was given this amp for free from a friend who said it did not work. I hooked it up and found that to be true. The power light dims erratically and the fans spins erratically. I checked all the fets and transistors for shorts and found none and then the only thing I noticed visibly was this high pass/low pass switch was broken. I found some on ebay that appear to be right but without schematics it's going to be hard to know. The only thing I haven't checked yet was rail voltages which I'll do tonight. If anyone has the schematics or can tell if these switches would work, there same amount of pins.
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13th July 2011, 03:07 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Solder the contacts together to see if there are any other problems. The following image shows how the switch works. Solder the contacts together to short the contacts for the switch position desired.
The RCA shields also break on the RCA jacks. If the amp only draws excessive current after the RCAs are plugged in, it's likely due to a broken ground pin. If the fan goes to full speed with no RCAs plugged in, it's generally because there is rail voltage on the speaker outputs.
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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30th July 2011, 04:30 AM
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#5 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Is there any DC on the speaker terminals of either channel?
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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1st August 2011, 11:53 PM
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#6 |
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diyAudio Member
Join Date: Aug 2009
Location: Detroit
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Left channel jumps around from 41volts to 20ish: 2300x.mp4 video by AA_0c00l - Photobucket
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2nd August 2011, 09:40 AM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Does the voltage remain stable with no input?
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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2nd August 2011, 12:12 PM
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#9 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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No. Did the other channel work properly while the defective channel was pulsing?
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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