JL Audio 1000/1

[S Merlington]

Anyone have a pic of the led board this amp came in with all wires broke off of it and need to see which one goes where?

Also what outputs and power supply fets does this amp use?

I need to order parts since the amp is dead and the ic's are missing for the small supply

 

[luigidedom]

got one coming in a bit later will post some pics for you

 

[Perry Babin]

They generally used the SSP45N20B. The SSP45N20Bs that I've tried don't seem to be the same as the older ones and didn't work for me.

The 1200 that replaced the 1000 uses an FDP52N20 with 22 ohm gate resistors. I don't know if they will work in the older 1000.

 

[S Merlington]

Ok I need to order some parts for this amp to get both supplies up and running first off ..

U513 is missing dontou happen to have a part number for that?

Next as you can see in the pic 1 of the smd transistors is missing do you happen to know what the part number is for that ?

Thanks for any info greatly appreciated

 

[Perry Babin]

MMBT3904
74VHC112

 

[luigidedom]

pic of the led board

 

[S Merlington]

Thanks greatly appericate the pic and the info

 

[S Merlington]

Perry,

I found 6 good SSP45N20B'S that I had laying around..

This amp takes 8 of them

Wondering if I put 6 of them in the amp will that be enough to see if this amp will play clean audio or to further troubleshoot?

 

[Perry Babin]

Answered in response to your email.

 

[S Merlington]

Put the outputs in the amp ..

Amp powers up and idles perfect ..

The power led lights up so does the low ohm led

Amp has no output at all where do I go from here?

 

[S Merlington]

Luigidedom,

Wondering if i can ask a favor?

Wondering if you can take a high res pic of the bottom of the main board where the power supply driverboard solders into it??

The pads are messed up in the one i have here and i need to see if certain pads are connected together or not..

Thanks for any help greatly appericated

 

[S Merlington]

Ok i replaced the cap have the outputs in the amp replaced the IC ..

Amp powers up but both the power led and low ohms led are lit up amp has no output ..

On the FQP30N06L i get

Leg 1:0.46
Leg 2:13.89
Leg 3:0.00

I do not get + - 15 volts of regulated vooltage on op- amps

I only get 1.22 volts on pins 13 and 15 of the 3525

Where do i go from here??

 

[Perry Babin]

Post waveforms for all 3 legs of the 30N06. Follow all suggestions in the 'best initial settings' on the oscilloscope page. If you miss anything, I'll ask you to re-read and post again.

 

[S Merlington]

Do you have a link to that page for the settings?

Can't seem to find it

 

[S Merlington]

Ok i found the page i read it re-read it several times..

I calibrated my scope ..

Scope settings are 10us 10v/div

Heres what i get on the legs of the 30N06L

Pic 1 is Leg1
Pic 2 is Middle leg
Pic 3 is 3rd leg

I messed around the the settings on the scope to see if i would get different results and still nothing this is all i get on the 30N06L

 

[Perry Babin]

Print out the section on 'best initial settings' and use those guidelines every time you use your scope.

Is the scope trace always that thick? It should be a fine, sharp, clean line.

There doesn't appear to be any drive signal. Post the DC voltage for all 3 legs of U601 (5v regulator).

 

[S Merlington]

Sorry had the focus or intensity set to high when taking the pic..

U601

Leg 1:12.59
Leg 2:0.00
Leg 3:4.59

 

[Perry Babin]

The 4.59v is a bit low but probably not causing any problems.

Post the DC voltage on all terminals of U800.

 

[S Merlington]

Pin 1:4.92
Pin 2:0.80
Pin 3:0.80
Pin 4:0.00
Pin 5:4.90
Pin 6:0.41
Pin 7:0.00
Pin 8:12.59

 

[Perry Babin]

Looking at the voltage on pins 5-7, it would appear that the IC is defective.