JL AUDIO E6450

mike49504 · 19th January 2011, 05:48 PM

I got this amp in for repair. The amp had 2 blown outputs so i removed them .
I still have problems with that channel since the new outputs got red hot .

The other problem is the amp is producing both + - regulated and rail voltages but i have no output out of any of the channels.

Any ideas on where to look?

mike49504 · 19th January 2011, 05:56 PM

Ok i checked again . ALL of the outputs get hot within secs

807tubenut · 19th January 2011, 06:34 PM

did you check the output drivers?

Perry Babin · 19th January 2011, 07:11 PM

Biasing?

Gate resistors?

mike49504 · 19th January 2011, 08:01 PM

i removed 4 bad outputs from this amp the other 8 are still in it.

All 8 get red hot within secs . The 4 i removed where bad the other outputs that are still in the amp tested fine.

Do i need to turn all of the bias pots down in every channel?

Also when i connect a sub to any channel i get fluttering on the outputs .

I tested for DC on the outputs but theres none.

Perry Babin · 19th January 2011, 08:08 PM

Turn all 4 channels down but before you do, measure the bias voltage across the test points to see what the factory bias is.

Do you get fluttering with no RCAs plugged in?

mike49504 · 19th January 2011, 08:33 PM

Well i figured out the fluttering problem.

Wheres the test points for the bias on this amp?

Perry Babin · 19th January 2011, 08:40 PM

Near the white source resistors.

What was the fluttering caused by?

mike49504 · 19th January 2011, 10:13 PM

When i plugged in the RCA's i didnt notice it at first but i had the rca's plugged into my sine wave generator not the test deck

mike49504 · 19th January 2011, 11:06 PM

Ok are you talking the diodes for the test point or is there anyway you can put arrows in the pic thats in the previous post?

19th January 2011, 05:48 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	JL AUDIO E6450 I got this amp in for repair. The amp had 2 blown outputs so i removed them . I still have problems with that channel since the new outputs got red hot . The other problem is the amp is producing both + - regulated and rail voltages but i have no output out of any of the channels. Any ideas on where to look?

19th January 2011, 06:34 PM	#3
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	did you check the output drivers? __________________ All my battles have been won, But the war has just begun.

19th January 2011, 07:11 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Biasing? Gate resistors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

19th January 2011, 08:08 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Turn all 4 channels down but before you do, measure the bias voltage across the test points to see what the factory bias is. Do you get fluttering with no RCAs plugged in? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

19th January 2011, 08:40 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Near the white source resistors. What was the fluttering caused by? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th January 2011, 05:56 PM	#2
mike49504 diyAudio Member Join Date: Sep 2006	Ok i checked again . ALL of the outputs get hot within secs

19th January 2011, 08:01 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	i removed 4 bad outputs from this amp the other 8 are still in it. All 8 get red hot within secs . The 4 i removed where bad the other outputs that are still in the amp tested fine. Do i need to turn all of the bias pots down in every channel? Also when i connect a sub to any channel i get fluttering on the outputs . I tested for DC on the outputs but theres none.

19th January 2011, 10:13 PM	#9
mike49504 diyAudio Member Join Date: Sep 2006	When i plugged in the RCA's i didnt notice it at first but i had the rca's plugged into my sine wave generator not the test deck

19th January 2011, 11:06 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok are you talking the diodes for the test point or is there anyway you can put arrows in the pic thats in the previous post?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Jl audio 500/1 powers on with low audio out help needed	ivkata	Car Audio	29	19th August 2011 12:21 AM
JL Audio 10w6v2 or Infinity Kappa 100.3se? Audison SRX4 or Jl 300/4?	DcMaN	Subwoofers	1	17th September 2010 10:28 AM
Repair JL e6450 Amp	krazchikin	Car Audio	3	12th August 2009 07:40 PM
jl audio	nicandjade	Swap Meet	0	2nd September 2006 10:35 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read