Alpine PDX and 1.1000

[caraudioguy2100]

Alpine PDX-1.1000

Anyone know what the part number is for these diodes ?

This amp needs some cleaning not taken care of at all

 

[Perry Babin]

The entire model number?

 

[caraudioguy2100]

Alpine PDX-1.1000

 

[Perry Babin]

What was the 'and' for in the title?

http://www.bcae1.com/temp/alpine - SM - PDX-1.1000.pdf

 

[caraudioguy2100]

Not sure my iPhone auto corrected to that for some reason and I didn’t catch it before I posted

 

[caraudioguy2100]

Replaced the diode and checked other components and they test fine .

I still don’t get any regulated voltages .

I noticed non of the regulators have input voltage

 

[Perry Babin]

Are both transformers being driven?

 

[caraudioguy2100]

How do I test to see if both transformers are being driven sorry still learning here

 

[Perry Babin]

Check the signal on SD902-SD905. One end should have a square wave. The other end, about 25v DC.

 

[caraudioguy2100]

First pic is one side of SD905
2nd pic is one side of SD902

I do not get 25 volts on either diode

Scope set to 5us 1v/div

 

[Perry Babin]

What rail voltage are you getting?

Is your scope set to DC coupling?

 

[caraudioguy2100]

At the rectifiers I get

D908:-58.7
D905:63.8
D906:-47.2 (D718)

Scope is set to dc coupling

 

[Perry Babin]

The transformers have 8 terminals on the primary and 7 on the secondary. Confirm that you read 0 ohms between all of the secondary windings. Do this for both transformers.

 

[caraudioguy2100]

On the secondary’s I get 0 ohms between the pins expect for the 2 outside pins for both transformers .

The ones I circled is where I get OL on meter all the rest measure 0 ohms

 

[Perry Babin]

Confirm that one of the open terminals connects to the SD902-905 diodes.

 

[caraudioguy2100]

I mis spoke in the last post .

Rechecking again here is what I get .

From the pins circled in the pic I only get OL on the meter to all other pins on each transformer . So I don’t get 0 ohms from those pins to any other pin on the secondary .

All of the other pins have 0 ohms between them

And yes the pins connect to those diodes

 

[Perry Babin]

The transformers look like they have open windings.

 

[caraudioguy2100]

So in other words unless I rip them apart or get new ones the amp is basically garbage .

In your opinion is it even worth trying to repair ?

 

[Perry Babin]

Would there be any way to get a few more turns of wire around the core of the transformer?

 

[caraudioguy2100]

Yes