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Rockford Fosgate T2500-1bdcp
Rockford Fosgate T2500-1bdcp
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Old 12th March 2019, 05:41 AM   #21
seankane is offline seankane  United States
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Is there any way to disconnect the power supply side from the class D side like the older bd's? Maybe that would help me in trouble shooting?


I thought of changing the regulators like the other amp on the forum but without knowing what the readings were before he changed them I'm not sure anything will change.
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Old 12th March 2019, 05:43 AM   #22
Perry Babin is offline Perry Babin  United States
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Does the audio side get hot at idle?

For one 2500 that I have here, the amp draws about 2.1 amps before the class D is engaged and about 4.4 amps after.

The amp I have has the 55947 driver board.
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Old 12th March 2019, 06:00 AM   #23
seankane is offline seankane  United States
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I've never let it idle for more than 2-3 minutes and played audio for only a minute or so. I didn't want to risk damage just in case. I haven't noticed anything getting hot other than the 2 large white resistors next to the regulators.


One thing I will add the current draw is sensitive to voltage input adjustments from the power supply. The lower the voltage the less the draw, the higher the voltage the bigger the draw. If I get up around 14.50 volts in the current draw pulses a little on the meter.


Its hard to tell the exact draw with my meter as I don't have a clamp.


I posted 2 pictures one at 14.4vdc and one at 12.8 vdc
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File Type: jpg 20190311_225353.jpg (768.4 KB, 33 views)
File Type: jpg 20190311_225243.jpg (756.6 KB, 32 views)
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Old 12th March 2019, 06:00 AM   #24
Perry Babin is offline Perry Babin  United States
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See also #22.

If C118 serves the same purpose on all BD PS boards, soldering a jumper across its terminals should prevent it from charging and prevent the output stage from switching on.

Confirm that the passing of 4v on its positive terminal corresponds to the switching on of the output stage.
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Old 12th March 2019, 06:02 AM   #25
seankane is offline seankane  United States
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Sometimes its a little higher than these photos like with a load connected and a source connected but not much.
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Old 12th March 2019, 06:13 AM   #26
seankane is offline seankane  United States
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I'll confirm this tomorrow and post results. So as soon as the cap reaches 4vdc on the positive terminal the output stage switches on correct?


If I still have the draw then I'll know there is a problem in the power supply.


If I don't it must be in the audio side. Its hard to know how much the audio side should draw. Other 2500's I have had here did not draw this much current.
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Old 12th March 2019, 06:14 AM   #27
seankane is offline seankane  United States
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I'm also wondering why the input voltage affects the draw.
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Old 12th March 2019, 08:55 AM   #28
Perry Babin is offline Perry Babin  United States
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For the amp I have here, the input voltage 12-13.8 didn't make the current draw change more than a tiny fraction of an amp.

Yes to the first question in #26.

Does the rail voltage change much (measured between the center legs of the rectifiers) as you adjust the input voltage?

Does that voltage ever exceed the rated voltage of the rail caps?
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Old 12th March 2019, 11:25 PM   #29
seankane is offline seankane  United States
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The rail voltage is sensitive to input voltage, but does not exceed the caps limit.


At input of 12v = 111v rail
At input of 14v = 147v rail
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Old 12th March 2019, 11:31 PM   #30
seankane is offline seankane  United States
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C118 reaches about 3.8vdc the output stage switches on then the cap jumps to 4.56vdc and stays there.
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