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i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 02, 2009 at 11:04 PM / IP Logged  

That should be the only failed part.    Connect a speaker to it and see if it plays.  Wherever that is easier to do, on the bench or in the car.

terry osborn 
Copper - Posts: 54
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 16, 2009
Location: Texas, United States
Posted: June 04, 2009 at 12:30 AM / IP Logged  

Looks like you've pulled off another long distance repair my friend.All 4 channels of the amp are functioning as designed. I really appreciate your proffesionalism and the time you spent with this. If you'll give me a name and physical address i'd like to at least send you a certificate for a nice dinner,or if you prefer a contribution to this website or possibly a favorite charity,your choice. This site is absolutely the best i've seen for all things 12 volt. Take care.

I've noticed one thing about "Experts". When one shows up,someone gets hurt!
i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 04, 2009 at 1:10 AM / IP Logged  
Hey, it was a pleasure to help you.  If I asked 4 questions, I got 4 answers.  It was really a pleasure.    A contribution to this site will be great.
terry osborn 
Copper - Posts: 54
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 16, 2009
Location: Texas, United States
Posted: June 04, 2009 at 11:01 PM / IP Logged  

As you requested,and being one that honors his word,a contribution has been made to this website.I look forward to working with you again. Many thanks.

I've noticed one thing about "Experts". When one shows up,someone gets hurt!
i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 05, 2009 at 9:52 PM / IP Logged  

Most people don't look forward to needing my help again.  You should hope that all of your equipment remains in working order.  However, i will be here if you do need help again.     You left out the word "rather" in your signature line.

terry osborn 
Copper - Posts: 54
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 16, 2009
Location: Texas, United States
Posted: June 06, 2009 at 1:07 AM / IP Logged  
Yeah,your right.Most people wouldn't look forward to an equipment crash,but i'm alway's hunting for the next learning experience.
I left that word out of my signature line on purpose. You did so well with the electronics,thought i'd see how you faired with quotes.That's two up,way to go!
I have a 45 amp 120v to 12v converter made by Todd engineering. Same story line,no burns,scorching,blown fuses etc...Interested?
I've noticed one thing about "Experts". When one shows up,someone gets hurt!
i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 06, 2009 at 2:06 AM / IP Logged  
I am scared of 110 volts. But as long as you are the one probing the HOT wires, let's go for it. I am not familiar with that brand of supply. Is there a bank of TO-3 cased transistors? Is there a chip that looks very similar to the 494 of the amp? Number should be XX723 or XX729?.
terry osborn 
Copper - Posts: 54
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 16, 2009
Location: Texas, United States
Posted: June 06, 2009 at 8:41 AM / IP Logged  
I'll take a closer look at it,and i'll take a few pictures and e-mail them to you.Let you know when i've done so. 120v isn't a concern,i work with 4160vac and 600vdc daily.
I've noticed one thing about "Experts". When one shows up,someone gets hurt!
terry osborn 
Copper - Posts: 54
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: May 16, 2009
Location: Texas, United States
Posted: June 06, 2009 at 11:59 AM / IP Logged  
E-mailed pictures,should be in your box.There is 2 banks of transistors,4 in each.1st group on left at the 120v end.labeled Q1 thru Q4 are marked (IRF740\IR820F). 2nd group on right at 12v end labeled D1 thru D5,4 is ommited,marked (30CT0045\IR82F).These all attach to heatsink. 2 chips on the motherboard both have 8 pins,1 marked M76BB\393M, other marked CS3845B\9729J. Also have 2 chips on a plug-in companion board,a six pin marked CNY173,and an 8 pin marked M79A2.
I've noticed one thing about "Experts". When one shows up,someone gets hurt!
i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 06, 2009 at 2:52 PM / IP Logged  
The 740s are Mosfet power supply transistors.  The ones labaled D are the rectifier diodes.  The chip I was asking about is in some older power supplies.  What exactly is the supply doing or not doing?  Have you checked the fuse with a meter? 
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