jl audio 1000/1 version 1 rev 10

[klangston76]

I recently bought the amp,the guy hooked it up wrong.when i opened it i had a 100nj100 rattling loose in it dont know where it goes.I believe i was answered on position c809,c810,and c839 as these are all missing in the board.Is there anything in position c509 or is that an empty slot?when i powered the amp today i had a low voltage light,would any of these give me that result?The board looks ok not fried but the individual i bought it from claims theres no output sound.I have attached pics,any help would b great

 

[Perry Babin]

C509 is not installed.

The low voltage light is illuminated when the B+ voltage is too low. Did you measure the DC voltage directly across the B+ and ground terminals?

As far as I know, none of those components could cause the low voltage LED to light up?

 

[klangston76]

no i just measured the + lug of amp to the battery and it read around 14 volts,would the other components affect outout sound?He had said he hooked the speakers up wrong

 

[klangston76]

I was just out in the building with a car battery and a charger hooked on it to see if it would power up,so could be why voltage was low

 

[klangston76]

Before i forget thank you for helping me troubleshoot,its much appreciated

 

[Perry Babin]

You'll have to put a meter on it to know for sure.

 

[klangston76]

I will meter it again tomorrow on the voltage.is there any particular place I should look and test for the output for sound from that amp?if so can I use a multimeter?that's really all I have?

 

[Perry Babin]

Yes.

 

[ultra]

bad capacitors

in the last pic you posted, the two 2200/25V electrolytics closer to the transformer, seem to be in bad condition.

 

[Perry Babin]

I didn't notice earlier but it appears that some of the windings on the power transformer are darkened and may have some enamel missing. Is it due to the lighting or are the windings darkened?

 

[klangston76]

Yeah that coil is rather dark,I did notice that.

 

[Perry Babin]

If the transformer is defective, it's not likely to be repairable. JL may be able to repair it but it would be expensive.

 

[klangston76]

Ok,went ahead and hooked the amp up earlier today just to see exactly what would happen,it powers up for around 10 seconds,you can hear faint music then it kicks my 150 amp breaker and the low voltage lights up just before it kicks the breaker?any advice from there?

 

[Perry Babin]

Don't do any testing with a 150 amp breaker as the only protection. That's a good way to turn a repairable amp into a smokey paperweight. I don't know of any amp that won't power up via a 30 amp fuse. Most will power up via a 15 amp fuse.

If the transformer is damaged, there probably isn't any practical way to repair it. If you can take a 'good' quality close-up photo of the damaged area of the transformer, it would be much easier to determine if the transformer is salvageable or not.

 

[klangston76]

Appreciate the info Perry,It did kick the breaker fast.that transformer has a dark coating all around it,like it's been painted,I say this because it's even smeared with paint on plastic shields coming off the transformer,but I will try to get you a better picture

 

[klangston76]

Is the jl audio a descent amp and should I just take it to a repair shop?I've had a Rockford fosgate power 800a2 for atleast 10 years now and no problems,I'm just curious if this amp can compete with the old Rockford?I've had jl audio subs was impressed with the sound so I know that make great stuff

 

[klangston76]

 

[Perry Babin]

JL makes very good amplifiers but unless you have deep pockets, the 1000/1 may not be a good choice. It's generally expensive to purchase and when it fails, it can be difficult/expensive to repair ($200+ for an average repair).