Rockford T2500 - 1BD

[Albis2985]

Good afternoon Perry,
The resistance between 5 and 7 in both ICs is 0.8 ohm

 

[Perry Babin]

Measure the resistance of the output side. It's generally easiest to measure on the transformer side of the diodes. Measure 1-2 and 7-8 for both transformers.

This is for an older amp but I think the general circuit is the same at this point (designations will not match).

 

[Albis2985]

Transformer that goes to U2002 pin 1 and 2 of the transformer starts at 8 mega and is rising pin 7 and 8 measures 1.8 ohm
transformer that goes U2000 pin 1 and 2 5.7 mega pin 7 and 8 1.8 ohm

 

[Perry Babin]

Did you measure with the probes on the the diodes and on the transformer side of the diodes?

 

[Albis2985]

I misunderstood I thought it was straight on the transformer pins, how should I do it?

 

[Perry Babin]

If you're 100% sure of the pin numbering and can get to the pins, you can measure directly on the transformer pins.

 

[Albis2985]

Good evening Perry, I had an urgency and I had to leave, 100% sure of the pins that I am not, but I saw that one of the transformers has a signal and the other does not. I attached the images. Both have the same voltages, will it be the transformer that is causing the problem? Tomorrow I am at home, I will exchange the transformers to test and whatever I write to see if you have time and will continue to provide your great support.

 

[Perry Babin]

One transformer could be bad. You stated that both 5110s had the same output. I'm assuming that that signal is reaching the input of both transformers.

I don't know the numbering scheme. That's why I suggested checking on the diodes.

 

[Albis2985]

Good day Perry definitely one of the transformers is bad before exchanging them I withdrew all the es2d diodes and they all measure well and once changed I had a signal in the outputs that were not there and in which there was the signal was no longer. Now the question is how do I get that transformer since it has no visible part number or reference to it? thanks for your help

 

[seankane]

Use the Tamura PHT-102.

 

[Albis2985]

thanks seankane but where can I ask it to be reliable since mouser and digikey which is where I always ask for parts do not have it available

 

[seankane]

Onlinecomponents.com
Verical
Master Electronics
Electro Sonic


They are in stock from all these distributors.

 

[Albis2985]

Thanks SeanKane I already requested them.

As soon as I receive them, I will let you know how the repair was and thanks to you Perry for the support

 

[Albis2985]

Good day

I am returned with this amplifier I installed the new transformers and it turned on blue but the yellow protection light flashes and I do not get a wave signal at the outputs, I removed all the outputs and the wave signal is present in all mosfet gate, doubt bad mosfet threshold does not match or should I check something else
I accept suggestions

 

[Perry Babin]

Are all of the FETs 100% open from the gate to the other legs?

 

[Albis2985]

Well, I really haven't checked them yet, I just withdrew them because it was a bit late, however, 4 are completely original and 4 I bought them at a local store, when I got home I check them out and comment thanks Perry

 

[seankane]

I think you may have some shorted output devices. Check them carefully.

 

[Albis2985]

Sean Kane when you mean devices do you mean mosfet only or all the drive transistors and diodes that make up the output circuit?

 

[seankane]

I would start with the output FET's. You are sure you installed the transformers in the correct orientation?

 

[Albis2985]

It has a white point on one of the legs of the transformer I assume that it is the pin that goes to the one that has the point on the plate that would be pin 1 correct me if I'm wrong