HELP! I think my jl amp is blown.

Bumpin 86 Caddy · 26th May 2011, 12:28 AM

I think my jl 500/1 v2 is blown. I blew a Cerwin Vega 15" stroker a few years ago and my friend tried to fix it. so to test it i hooked it to my jl 500/1 and now the amp doesnt work? power light is green but no power comes out. There is no fuse on the amp outside or inside that i could find. anyone know a simple fix perhaps? or a place i could send it cheap?

nigelwright7557 · 26th May 2011, 12:36 AM

Its highly unlikely not to have a fuse somewhere or some form of protection.

DREW028 · 26th May 2011, 12:52 AM

my 1000/1 went out bout a month a go. neighbor said he heard a loud thump come from my car in the middle of night???? Mines still come on also but no output. Im thinking something on the smaller preamp board went out. Havent had it check out yet but if i do it will be local. Price of repair would only be worth it if you could find someone local. After shipping back and forth repair and parts cost you be close to a decent used or maybe new amp with a few bucks more.

DREW028 · 26th May 2011, 12:54 AM

i ended up getting a older autotek off ebay for $75 and it does 750watts rms. Decent for now

Bumpin 86 Caddy · 26th May 2011, 01:00 AM

I was using the amp to push my juggernaut 15" I need to upgrade anyway. But jl is supposed to be one of the best. It's only a year old. Does anyone know if there is a fuse on jl 500/1 amps?

91h22a · 26th May 2011, 02:11 AM

No fuse that I remember. I had one in for repair with similar symptoms, power light no output. It will likely need repair but it can be done. If you wanted to get rid of it someone like me would love to have it!

Perry Babin · 26th May 2011, 06:36 AM

With the black meter probe on the amp's main ground terminal, what is the DC voltage on each of the speaker terminals (amp on, no input)?

Bumpin 86 Caddy · 12th June 2011, 12:35 AM

Amp on. Black probe on amp ground. Meter set to 12v all speaker terminals 0.00

Perry Babin · 12th June 2011, 12:42 AM

It appears that the power supply FETs may be blown. Pull the bottom cover and look at the resistors in front of the transistors in the right-rear corner. They should look clean (second photo), not like the ones in the first photo. Look at all 8 of them.

Bumpin 86 Caddy · 12th June 2011, 05:36 PM

R600 to R607 they look more like the first picture. But not that bad. They look like the bands in the middle cracked they don't look burnt tho.

26th May 2011, 12:28 AM	#1
Bumpin 86 Caddy diyAudio Member Join Date: Mar 2011 Location: Cincinnati, OH	HELP! I think my jl amp is blown. I think my jl 500/1 v2 is blown. I blew a Cerwin Vega 15" stroker a few years ago and my friend tried to fix it. so to test it i hooked it to my jl 500/1 and now the amp doesnt work? power light is green but no power comes out. There is no fuse on the amp outside or inside that i could find. anyone know a simple fix perhaps? or a place i could send it cheap?

26th May 2011, 12:36 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Its highly unlikely not to have a fuse somewhere or some form of protection. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

26th May 2011, 06:36 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the black meter probe on the amp's main ground terminal, what is the DC voltage on each of the speaker terminals (amp on, no input)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th June 2011, 12:35 AM	#8
Bumpin 86 Caddy diyAudio Member Join Date: Mar 2011 Location: Cincinnati, OH	Amp on. Black probe on amp ground. Meter set to 12v all speaker terminals 0.00 __________________ 1 Juggernaut 15" -- JL Audio 500/1 V2 Kenwood Hean Unit -- Big 3 Upgrade 0/1 Gauge

12th June 2011, 05:36 PM	#10
Bumpin 86 Caddy diyAudio Member Join Date: Mar 2011 Location: Cincinnati, OH	R600 to R607 they look more like the first picture. But not that bad. They look like the bands in the middle cracked they don't look burnt tho. __________________ 1 Juggernaut 15" -- JL Audio 500/1 V2 Kenwood Hean Unit -- Big 3 Upgrade 0/1 Gauge


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26th May 2011, 12:52 AM	#3
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	my 1000/1 went out bout a month a go. neighbor said he heard a loud thump come from my car in the middle of night???? Mines still come on also but no output. Im thinking something on the smaller preamp board went out. Havent had it check out yet but if i do it will be local. Price of repair would only be worth it if you could find someone local. After shipping back and forth repair and parts cost you be close to a decent used or maybe new amp with a few bucks more.

26th May 2011, 12:54 AM	#4
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	i ended up getting a older autotek off ebay for $75 and it does 750watts rms. Decent for now

26th May 2011, 01:00 AM	#5
Bumpin 86 Caddy diyAudio Member Join Date: Mar 2011 Location: Cincinnati, OH	I was using the amp to push my juggernaut 15" I need to upgrade anyway. But jl is supposed to be one of the best. It's only a year old. Does anyone know if there is a fuse on jl 500/1 amps?

26th May 2011, 02:11 AM	#6
91h22a diyAudio Member Join Date: Sep 2007	No fuse that I remember. I had one in for repair with similar symptoms, power light no output. It will likely need repair but it can be done. If you wanted to get rid of it someone like me would love to have it!

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