Need help to repair two phase 400 amps

[LarryD]

Good Morning Lee

I have all the output transistors installed. I have been trying to wire the board but I am having trouble with the diagram. You had mentioned that we have a upgraded rev (a) board. Is this why the diagram is not corresponding or is it me ? Would it be possible for you to draw up a exact diagram, or are you going to make me work for it ? LOL I have not yet soldered the 20 gage ground to the cap bus bar, no working gun yet. I am extremely busy today and will be in and out. I see your makings on the terminal strips, are these areas being omitted? I am in no rush here. I will be back to check for a reply in a bit. And thank you again Lee for everything .!

 

[laatsch55]

The "enhanced" part of that board is the addition of the 4 diodes on the back of the board. They prevent a "latching up" of the negative rail to the speaker outs.

As far as the wiring diagram goes, we are going to wire the bias transistors to the 3 hole connectors on the back of the board first. This is going to take awhile, so if you are going to be in and out all day, pick a time when you can devote a couple hours to this....

 

[laatsch55]

I have all the output transistors installed. I have been trying to wire the board but I am having trouble with the diagram. You had mentioned that we have a upgraded rev (a) board. Is this why the diagram is not corresponding or is it me ? Would it be possible for you to draw up a exact diagram, or are you going to make me work for it ? LOL I have not yet soldered the 20 gage ground to the cap bus bar, no working gun yet. I am extremely busy today and will be in and out. I see your makings on the terminal strips, are these areas being omitted? I am in no rush here. I will be back to check for a reply in a bit. And thank you again Lee for everything .!

And post a pic of the output transistors with a reference to the bottom of the amp...

 

[LarryD]

There are two phoenix connectors on the back of the board. on the other side is cr br er .? Here are pics. And you can't make out the driver numbers very well but u have to trust me here. I have triple checked and they are the four at the bottom. P.S. I am liking the allen screws!. I still do not have the soldering iron returned. Waiting. What is the best time for you to finish her up ? What ever works for you.

 

[LarryD]

I just saw your markings on the connectors, sorry-- and the four drives on the amp are the furthest away vertically from the fuses.

 

[laatsch55]

Take out all the outputs BUT the drivers. Then we'll get on the wiring.

 

[laatsch55]

The BOTTOM ROW is the bottom transistor of each VERTICAL ROW....

 

[LarryD]

Lee, the drivers are at the bottom of each row. I do not understand ?

 

[laatsch55]

All we want installed on the backwall when we fire this amp up is the drivers, on the bottom row, then if it is a successful bring up we'll install another row, etc...

 

[LarryD]

Pic of amp w/drivers and My trick install extended Allen wrench and Vacumm chuck to install and remove the outputs. No more fumbling with them.

 

[laatsch55]

Now, put the amp on it's normal bottom side down , open side facing you, faceplate off and out of the way. Driver board on the bench laying down with the connectors facing the amp, component side down....take a pic and post.....

 

[LarryD]

front and back

 

[laatsch55]

With you sitting in front of that, from left to right on the 3 hole connectors, red-black-brown, both connectors the same...These are the bias transistor wires...

 

[laatsch55]

Soooooooo....... what happened here, we were 2 hours away from having this running.....??

 

[Bradrock]

Well this sucks! I wish I would have looked at the last page first!! And I had a headache BEFORE I started reading 40 pages.

 

[kevin]

What the hell.... How long ago did this thread die Lee... I just now read the whole thing again.. Wish I had started on the last post first !!! What happened to Larry ?????????

 

[kevin]

Damn... I see now.....2-5-16 LMAO !!! WOW !

 

[Bradrock]

Kevin; I'm trying to read all of these type threads, to soak up as much as I can before I start soldering my first WOPL kit.

 

[kevin]

Good Idea... I guess maybe Larry D finally decided to do the same thing... Maybe he is still reading ....

 

[laatsch55]

Yeah Kev, I thought we were closae...