Stage Line 500W amp repair project

[Arouse1973]

Thank you so much , this project has to be finished, whoever finishes it is welcome to sell it to pay for there time

Wash your mouth out with soap lol. I am doing this for free, it is your amp and will be returned to you.....working or not working lol.
Adam

 

[bikemech]

Ok guys, this has never been fi ished and i still have the amp and all components, also a bit more knowlage and better equipment including a small workshop/ shed, if anyone is still i terested i am going to reprint all the schematics and get this thing on the bench once again, i have to be honest, after chris passed i completely lost interest, but i cant bring myself to bin it, its been carted from house to house and garage to garage but 99%sure everything is still in the box, including all the parts i bought to replace, so guess i have no option but to try again, as its xmas i have some time off and have some time to re read where we all left off, i will be back soon with an update, although this may take me some time as its been quite a journey so far thanks,

Pete

 

[(*steve*)]

We're still here to help

 

[Harald Kapp]

Wow, comeback after 3 years. Rarely seen here.

 

[bikemech]

We're still here to help

Fantastic, i cant bring myself to throw it away haha

 

[bikemech]

Whats the best way to add photos on here, i used to use photobucket but its a pain and my storage on there is full, thanks
Pete

 

[bertus]

Hello,

You can shrink the photos to a size of about 100 kB.
Then you can upload the photos to the forum using the "Upload a File" button.

Bertus

 

[bikemech]

Yeah i thought that, thank you

 

[bikemech]

Some new equipment, and parts i have left , think the only thing missing is a few screws, more pix to follow

 

[bikemech]

 

[bikemech]

So i decided it would be a good idea to reconnect all the cables and power it up for the first time in a long time,
Its alive, no protect lights on and the fan is running, honestly dont think this was far from completion, the main drivers are still removed though

 

[(*steve*)]

That's a good start

 

[bikemech]

So where do we go feom here, i am tempted to install the main drivers and see what happens, although i have no real way to know if it actually works, as in no load, (speakers or connectors) and l also need to disassemble the heatsink and clean it propperly from where i blew it up last time, oh and also still need thermal paste ha

 

[bikemech]

Also i have a new project after this, very similar but hopefully wont take so long to complete

 

[(*steve*)]

At the very least I'm going to have to go back and read the thread again. Unfortunately I'm not in a position to do that right away.

 

[bikemech]

Bit of clean up work today, heatsink was still filthy, also Q12 was a bit loose, on closer inspection half the tracks on the board were partly missing or came away, here is my fix, if there is a better way to do this please let me know, it was a pain

 

[bikemech]

Much better, also replaced R62 and R71 to match the left side

 

[bikemech]

So now all cleaned up and back together, some re soldering done, and fot the first time one of the fuse resistors has blown and lit up, T17, and fault left light is back on, i think i have fixed the bad solder joints and recreated the original fault , at least its an indication where to look next,

 

[bikemech]

That's a good start

Realised today after cleaning and re soldrring i disnt have the positive lead connected to the left channel, thats why it seemed to be ok ,when it is connected it blows T17 fuse so it seams there is a dead short somewhere on that side

 

[Martaine2005]

Are the output transistors new?
Have you checked them for shorts?.
This has a few pages to read up on. But was working without output transistors?.

Martin