JL e1400DM

[jomede]

I have a JL Audio e1400DM that comes on but has no sound out. I took the back off of it to see that there are 4 green leds lite up but the driver board and the 4 leds in a row that are in front of the 2200 uf 80 volt caps do not light up. Any suggestions on were to start trouble shooting. I know my way around a multimeter and can check most components. Thanks for any help in advance.

 

[mike49504]

Take the Clips off off all the transistors.. Wiggle the rectifier around to see if it has any broken legs ... Theese amps are know for broken legs on the rectifiers..

 

[jomede]

Check both sides of the heat sink?

 

[jomede]

No Broken Legs

Checked all 8 of the IRFZ44N...no broken legs or burn marks
Checked all 4 of the IRF540... no broken legs or burn marks
Checked both LM337T...No broken legs or burn marks
Checked the single U1640cq441 no broken legs or burn marks

What next guys?

Thanks for your help in advance.

 

[mike49504]

Did you take the clamps off or not?

 

[jomede]

clamps are off

I took all the clamps off.

 

[jomede]

Help

 

[Perry Babin]

Clamp everything to the heatsink except D18. Power up the amp and measure the DC voltage on the center leg of D18. Do NOT let the probe short between the legs of D18. The black probe will be placed on the amp's ground terminal when measuring the votlage.

 

[jomede]

.51 volts

 

[Perry Babin]

What is the DC voltage on the 47 ohm resistor (marked 470) near Q62?

 

[jomede]

4.4 volts

 

[Perry Babin]

Set your meter to AC volts and measure the voltage with the probes on the outer legs of D18.

 

[jomede]

83.3 volts

 

[jomede]

Where do I go from here?

 

[Perry Babin]

I think the rectifier is defective. If you read 80+v of AC, there should be much more than the DC that you read on the center leg.

 

[jomede]

Where can I get one to replace it...ebay?

 

[mike49504]

Mouser Electronics

Future Electronics

Digikey


All of thoose suppliers have them in stock..

 

[jomede]

I ordered this part from Digi-key

MUR1640CTGOS-ND

Original part number:

ON
U1640
CQ441
AKA

 

[jomede]

Perry..Thanks for your help. I will let you know once I have the part installed...

 

[jomede]

Got the part tonight..put it in and benched tested it....works like a champ..one question when do the 4 led lights in a row light up? The led on the driver board lights up now. Thanks for your help Perry.