Memphis 16-pr1x1000 help

[rhempz01]

Better

 

[Perry Babin]

Are you 100% sure that some of the outputs failed?

 

[rhempz01]

Yes 2 are shorted.

 

[rhempz01]

I went with these

https://www.digikey.com/product-detail/en/5213356

 

[Perry Babin]

Link isn't working.

 

[rhempz01]

Sorry Perry, This is the part number if this link doesnt work: NSS40302PDR2G

https://www.digikey.com/product-det...or/NSS40302PDR2G/NSS40302PDR2GOSCT-ND/5213356

 

[Perry Babin]

I think that's the wrong package. The original is SO-8, if I'm not mistaken.

 

[rhempz01]

8-SOIC (0.154", 3.90mm Width i think it was the same ill check. thanks. The company says same thing??

 

[rhempz01]

So I got all the new parts and the chips the manufacturer says is the same package. But this white dot does that mean something about the position of the chip? Like should a certain leg be at the white dot?

 

[rhempz01]

Everything is in so I was going to resist the current and test the dc on the 3205 and the fb52n15d's. All of them and the drivers are new and I replaced those chips for the outputs with the chips I posted?

 

[rhempz01]

Should all 8 of my outputs be the same dc? I have 4 showing 4.19v with resisted current the other for are showing -14.2 v. I am wondering if this is normal or do I have one of those chips backwards.

 

[Perry Babin]

The page from where you purchased the ICs had a datasheet. The datasheet identifies pin 1. Pin 1 goes to the white dot. I didn't think answering this question was necessary since I didn't see it until after you stated that you installed them.

Not knowing where you had your probes (black and red and if relevant, on which terminals of which IC), it's impossible to use the voltages that you posted.

 

[rhempz01]

Thats how I installed them. Ok so the amp powers up, I get 1-3 of all outputs 3.00v.

 

[rhempz01]

On pin 1 q103 I get 7.03v on pin 1 of q108 -12.21v I was concerned since I had used a replacement chip based on the data sheet.

 

[rhempz01]

so with limited current everything appeared ok so when i tried to power it up it blew a ten amp fuse?

 

[Perry Babin]

Did any outputs fail?

 

[rhempz01]

With the resisted current I have 1-3 a consistent 3.01v on all outputs. Is this smd correct Perry on q111, it seems odly placed is all. How should I test them in circuit. Or should I remove the gate leg

 

[Perry Babin]

This is a photo of the same model but it's not the same as yours. For example, R178 is missing in your amp and doesn't appear to have been installed. As you can see, there is a trace in place of the resistor on Q111.
http://www.bcae1.com/temp/IMG_2104.JPG

These are the parts that failed when the outputs failed on one amp I repaired. Check them (mainly regulator and resistor) in your amp.
http://www.bcae1.com/temp/IMG_2100bnotes.jpg

Will the amp produce audio with the limiting resistor in place?

 

[rhempz01]

Ok will do thanks again Perry. No it does not produce audio audio.

 

[rhempz01]

Also it appeared to be burnt or charred around q111, not sure if it relevant or not. And check those components.