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Rockford Fosgate Power T2500-1bd
Rockford Fosgate Power T2500-1bd
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Old 28th May 2021, 07:06 PM   #1
RJohns777 is offline RJohns777
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Default Rockford Fosgate Power T2500-1bd

Hi, working on a RF Power T2500-1bd. Power supply is running. No shorts in the outputs. I have +142V rail. I don't have the minus rail voltage. I have 160 AC to both negative rail diodes CR2 and CR1005 but +24 v on the cathodes. I pulled all the outputs just to make sure they weren't a problem. Anyone familiar with this amp that can give me some ideas. Called Rockford. Schematic not available.
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Old 28th May 2021, 07:18 PM   #2
caraudioguy2100 is offline caraudioguy2100
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When you measured rail voltage did you measure between the middle legs of the rectifiers?

Thatís how you test rail voltage in these amps
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Old 29th May 2021, 08:30 PM   #3
Perry Babin is offline Perry Babin  United States
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As was suggested above, you have to measure the rail voltage between the output legs of the rectifiers. There is no positive or negative rail. There is only one rail and it's switched up or down as needed for the output stage.
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Old 8th June 2021, 07:51 PM   #4
RJohns777 is offline RJohns777
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Just got back from vacation. Measured between diodes and have 137.4 volts. So I guess all that is fine. Now to find out why I have no output. I don't guess anyone has a schematic for this amp. Called Rockford they said not available for release yet.
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Old 8th June 2021, 09:58 PM   #5
RJohns777 is offline RJohns777
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Anyone familiar enough with this amp to answer a question for me. I think the amp is muted. I have what looks to be input on pins 2 and 4 of U2000 and U2002 but no output on pins 5 and 7. I have 6.8 volts on pin 8 of both chips. I believe this to be bd mute. I'm using a schematic for a Power T5001bd. Can't find where bd mute originates. Can anyone help?
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Old 9th June 2021, 05:54 AM   #6
Perry Babin is offline Perry Babin  United States
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On that diagram, U4-D is the mute output.

Do you have all of the various supply voltages?

Do you have audio reaching the output driver board?

Do you have rail-rail oscillation on the output transistors?
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Old 10th June 2021, 12:40 AM   #7
RJohns777 is offline RJohns777
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"On that diagram, U4-D is the mute output." Yes found it on the amp power supply driver board. U101


"Do you have all of the various supply voltages?" I have rail voltage. +/- 15 volts. The schematic shows regulators for various voltages. I don't see regulators on this board. So I don't know about the other voltages.



"Do you have audio reaching the output driver board?" Yes


"Do you have rail-rail oscillation on the output transistors?" Please explain how to check rail to rail oscillation with only one rail.
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Old 10th June 2021, 03:49 AM   #8
Perry Babin is offline Perry Babin  United States
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See attached for the regulators.

Do you see anything other than straight DC on any of the output transistors?

The Rockford amps are a bit different, compared to other class D amps but this is basically R-R oscillation:
bcae1.com - Car Amplifier Repair Tutorial - The Basics
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Old 10th June 2021, 08:51 PM   #9
RJohns777 is offline RJohns777
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Q2010 - B +11.18, C +13.55, E +11.75
Q2012 - B +11.18, C +13.64, E +11.76
Q2000 - B - 6.28, C -24.58, E -6.85
Q2001 - B +6.26, C +13.5, E +6.85


Pretty much straight DC on outputs.


No Rail to rail oscillation that I can see.
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Old 11th June 2021, 03:31 PM   #10
Perry Babin is offline Perry Babin  United States
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How many high-frequency pulses (50kHz-100kHz) do you have on the header pins of the output driver board?
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