Rockford Fosgate P10002

[Perry Babin]

At the very least, you need to replace:

Q2021
Q2025
Q2028

R2081
R2092
R2099

Desolder R2081, R2092 R2099 and check:
R2094
R2097
R2074

Remove Q2028 from the circuit, reinstall R2081 and R2092, clamp the transistors to the heatsink, insert a 15 amp fuse in the B+ line and power up the amp. Does it still have DC on the defective channel's speaker terminals?

If not, does the defective channel produce clean audio?

 

[rafi77]

Perry thank you for all your help. I'm going to be pretty swamped with work and school the next few days. As soon as my schedule clears i will do all that and post the results. Again thank you so much for all of your help.

 

[rafi77]

Ok I just did as you asked and heres the results

R2094 - 10.0

R2097 - 39.0

R2074 - 10.0

Yes I do still have dc on the defective side after removing
the defective fet and resistor. It jumped around from neg to pos.

I'm going to test for audio now, but I have one quick question before I do. Are there l.e.d. lights on the board? Reason I'm asking is because I saw a red light flash and also a yellow light flash near were it says thermal on the board.

 

[mike49504]

Yes there is led's on the board. It should tell you on the board what the lights are I know the yellow is the thermal light the red one should be marked also next to the led.

 

[rafi77]

Yes there is led's on the board. It should tell you on the board what the lights are I know the yellow is the thermal light the red one should be marked also next to the led.

that's a big relief, I thought so thing went wrong.

 

[mike49504]

Do they stay lit or just flash for a quick second then go off?

 

[rafi77]

Do they stay lit or just flash for a quick second then go off?

flash for a sec

 

[mike49504]

Ok.

 

[rafi77]

thanks bro for letting me know

 

[mike49504]

How much DC voltage do you have on the channel that was defective?

 

[Perry Babin]

If there's 1v or more on the speaker terminals, do not connect a speaker to it. More troubleshooting needs to be done.

 

[rafi77]

I just hooked it up and it sound nice and clean but to forgot to check the voltage, but it did sound nice and clear. I took the amp out of the car and its late so I'm a leave it for tomorrow. But thanks for your help mike9504.

 

[rafi77]

I was so excited last night that I forgot what was the volt reading from last night so I rechecked and the defective channel reads +/- .001 - .008 DC volts. This was with audio playing without a speaker connected.

 

[mike49504]

When measuring for dc on the output terminals. Only hook power ground and remote to the amp. Do not plug the RCA's into the amp.

 

[rafi77]

When measuring for dc on the output terminals. Only hook power ground and remote to the amp. Do not plug the RCA's into the amp.

Ok.

 

[Perry Babin]

It appears that the driver and protection circuits have survived. Replace the components I suggested earlier.

 

[rafi77]

just home and testes the channel.

---> .012 volts

Thanks Perry and mike for your help.

 

[Perry Babin]

12mv is acceptable. Re-check it after you complete the repair and before you connect a speaker to it.

Read the following post if you haven't done so already.
http://www.diyaudio.com/forums/car-...-schematics-3.html?postid=1901581#post1901581

 

[2012stankiewicz]

is anyone on this thread anymore? i need a bit of info. i have the same amp. my power mosfets are bad.top right corner of amp that is picturd on page 1. i can find 4 of the 6. the very last two i cant cross anywere. they are on the chip marked as CQ543 and CQ614. what can i put in there that will work? any guidence will be greatful. i really think these forems are educational to the fullest. THANKS GUYS!!!

 

[Perry Babin]

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