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Thread Tools | Search this Thread |
24th September 2012, 01:42 AM
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#1 |
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diyAudio Member
Join Date: Jun 2012
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JL AUDIO 250/1
Anyone know the values of the power supply gate resistors ??
The gate resistors in this amp are all burnt to badly to read the numbers.. Its a REV 1 board |
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24th September 2012, 04:43 PM
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#2 |
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diyAudio Member
Join Date: Jun 2012
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Anyone know?
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24th September 2012, 05:06 PM
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#3 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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47 ohm
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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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27th September 2012, 03:14 AM
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#4 |
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diyAudio Member
Join Date: Jun 2012
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Replaced the Gate resistors , The drivers for the power supply fets and replaced the Power supply fets..
With just power and ground hooked up the amp will draw excessive current.. Any ideas on what to check? |
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27th September 2012, 07:22 AM
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#5 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do the power supply FETs heat up?
__________________
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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27th September 2012, 01:07 PM
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#6 |
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diyAudio Member
Join Date: Jun 2012
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Power supply fets are getting hot..
If the outputs are out of the amp the amp powers up and idle's perfectly.. If i put the outputs in the amp and only hook power and ground up NO REMOTE the amp will draw excessive current and the power supply fets and the outputs will get hot |
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27th September 2012, 06:55 PM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you see any oscillation on the output pins of the SG3525 when the output FETs get hot?
__________________
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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27th September 2012, 08:09 PM
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#8 |
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diyAudio Member
Join Date: Jun 2012
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On Pin 14 i get a square wave but it is bouncing around the display on my scope.. Its a square wave but its not clean and not steady..
Pin 11 i get nothing that looks like a square wave at all It just line going everywhere |
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27th September 2012, 08:15 PM
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#9 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Is the signal sensing set to 'on'? If so, switch it off. Does that make a difference?
__________________
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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27th September 2012, 08:30 PM
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#10 |
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diyAudio Member
Join Date: Jun 2012
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Switching it to the off posistion makes no difference
I replaced the power supply driverboard with 1 from a working amp Still have the same thing Last edited by S Merlington; 27th September 2012 at 08:58 PM. |
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