Rockford Fosgate T1000bd Repair help.....

[rhempz01]

I know that I can not handle the repair by myself. But this one is my amplifier so I had to try to repair it. I been trying to learn as much as possible on a few amps before now to educate myself. I definitely need help. My amp has blown all the ps fets violently. I removed them from the board. I think that a row outputs are shorted. I don't know where the drivers are for them. I have the ps fets and driver transistors already in stock.

 

[rhempz01]

Board 2006

 

[rhempz01]

Ps fets

 

[rhempz01]

Four of the outputs give me tone with the coninuty test, I believe they are shorted.

 

[MarioRestucci]

If the ps fets are burned like your, probably one or more output fets are shorted....and also drivers.

 

[rhempz01]

yes i pulled the output Mesha i believe was failed and 2 of the 4 are shorted the other two are ok> Do you know where the drivers are located for the outputs? ans possibly a part number if different from the ps fets, i replaced them already. (had them in stock from a rockford i previously worked on with perry

 

[Perry Babin]

Which two outputs were shorted?

 

[rhempz01]

Q209, Q207 perry.

 

[rhempz01]

Are the drivers for the ps q31-34? And do I need to change all of the pzta56, and pzta06 on the board? And I haft to replace all the outputs if 2 failed or can I just replace the blown 2?

 

[Perry Babin]

You need to check All components between T200 and the four outputs driven by that transformer. Check for open junctions as well as leakage in the transistors.
http://www.bcae1.com/temp/rockford - powerT10001bd-1405-51669-04.pdf

Connect only ground and remote and check the drive signal at the gates of all of the power supply FETs AFTER replacing any that appear to be defe4ctive (either burned, shorted or with open junctions).

 

[rhempz01]

All of them have 4.28v. the outputs that were shorted are removed.

 

[Perry Babin]

Are the new PS FETs in the circuit?

Did you need to replace any of the power supply gate resistors or drivers?

If so, have they already been replaced?

 

[rhempz01]

All new ps fets and q1-4 are replaced. That's where I am now. And I pulled the two shorted outputs from the rail. It's removed from the circuit. No gate resistors where out of tolerence.

 

[rhempz01]

Just for the forum. Photo.

 

[Perry Babin]

If you didn't find any defective driver components in the audio section, try powering it up through a limiter to see if it will produce audio.

 

[rhempz01]

Without the four outputs or replace all four, or just the 2?

 

[Perry Babin]

With just the 2 surviving outputs, mainly to see if there are any drive problems.

 

[rhempz01]

Ok so it powered up on the four outputs with audio, no protection, very low audio, but audio.

 

[rhempz01]

I'm not sure how to test the transistors in q201-q202 ect nor the ED 7CA imprinted diodes, located D208-D215 I checked them all by resistance in circuit to see if I noticed any difference most of the diodes tested at .505k and the transistors pzta56 4.99k 1-3 and the 06's are 91.9k with the exception of q203 and 206 is 14.61M and q218-q215 are open..

 

[Perry Babin]

You can compare the readings from one half of the circuit to the corresponding component on the other half of the circuit as long as the probes are placed the same on the components. If it played clean audio without drawing excessive current, it's likely OK.

I don't understand what you mean about 'low audio'. It's OK if you didn't drive it hard but if you had the gain at max and drove it hard and the audio was low, it may have other problems.