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Rockford Fosgate R1200-1D repair help
Rockford Fosgate R1200-1D repair help
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Old 9th March 2015, 03:46 PM   #1
madrunner91 is offline madrunner91
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Default Rockford Fosgate R1200-1D repair help

I have a R1200-1D with what appears to be blown mosfets and resistors on the power supply side. Amp came with replacement mosfets, but I couldn't find an exact match on the resistors but I bought these. But i need help identifying a burnt up component in between two of the mosfets.
20150306_211554.jpg
Any help would be appreciated, I'm a newbie when it comes to amp repair so take it easy on me.
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Old 10th August 2018, 03:55 AM   #2
AmplifiedVeteran is offline AmplifiedVeteran
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Did you ever get a response? I'm trying to identify the value of this same thermistor.
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Old 10th August 2018, 07:26 AM   #3
Eva is offline Eva  Spain
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1- Have you checked that the NTC is actually open?
2- Size looks like 0805 (2mm by 1.6mm).
3- The value can theoretically be found by: replacing the NTC by a potentiometer, adjusting potentiometer until no thermal shutdown, then until thermal shutdown, then disconnecting and measuring, then picking a suitable NTC knowing that shutdown temperature could be in the range of 90C (at such temperature NTC shall exhibit R value close to measured). Avoid the condition where the potentiometer directly shorts NTC.
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Last edited by Eva; 10th August 2018 at 07:29 AM.
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Old 10th August 2018, 09:55 AM   #4
motronix is offline motronix  Israel
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The NTC need to be 10K 0805
The gate resistors are 20R
The original P.S Mosfet are IRFB3077PbF
can you upload picture for all the PCB from the top?
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Old 10th August 2018, 11:44 AM   #5
Perry Babin is offline Perry Babin  United States
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Contact Rockford for a definitive answer and possibly the schematic diagram. Start a new thread if you have other questions about this amps.

There are 2 versions of the prime 1200, if I'm not mistaken. One uses a flyback power supply. The other uses a push-pull supply. The 3077 is for the flyback design.

The thermistor is likely OK unless it's missing or physically damaged. If it's on the board, set your meter to ohms and alternately heat and cool it. The resistance should go down when heated and up when cooled.
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