Rockford Fosgate BD1000@1 - Page 4 - diyAudio
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Old 4th March 2013, 02:44 AM   #31
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my bad your right.....
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Old 6th March 2013, 01:21 PM   #32
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Perry,

just purchased your amp repair tutorial...lunch is on me today....
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Old 6th March 2013, 01:25 PM   #33
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Please read ALL of the information. This includes all of the information on the introduction pages. It takes only a few minutes and will help you get a lot more from the tutorial.
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Old 6th March 2013, 06:40 PM   #34
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Awesome.. will do...
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Old 16th March 2013, 07:50 PM   #35
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Perry,

I used the scope with your tutorial and all my waveforms are in the correct spots except at the rail switching Fets and the audio output Fets. I pulled both MIC4420 drivers to check them more thoroughly. I also powered the amp and verified that there was a square wave on the 4420 input. both of the 2211 opto coupler outputs are at ~8. the Fets had 110v on them and i was expecting ~45 to 50. There was also no switching square wave on there outputs. My question is how does the Fet get the full rail voltage on it?
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Old 16th March 2013, 11:13 PM   #36
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The output transistors don't have any pulldown resistors. When the drivers are out of the circuit and the amp is powered up, you risk blowing the outputs.

If you had a square wave signal on the input pins of both 4420s, the drive circuit is likely OK.

Which pins of the opto-coupler were at 8v.

Were all components in the circuit when you measured the voltage that you posted above?
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Old 17th March 2013, 02:58 AM   #37
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Yes..It was on Pin 7. They maybe operating properly and i am over analyzing the scenario. Correct if I'm wrong..the IC driver 4420 is fed by a square wave signal and cycles between +10V and -10V on the output. The -10V turns on the irf6215's and +10V turns on the irf3415's. So should you see a square wave on the output pin of the IC driver?
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Old 17th March 2013, 08:57 AM   #38
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yes
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Old 18th March 2013, 12:28 AM   #39
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#37:
You will see this on the FETs for the rail switching FETs but you may not see this clearly on the FETs that drive the output to the speaker terminals because the FETs driving the speaker terminals are floating.

The rail voltage on the FETs is constantly switching unless there is a problem or the amp is in protect/mute delay.

If you have the tutorial, read the BD1500 page in the Rockford folder.
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Old 18th March 2013, 03:15 PM   #40
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Perry

Can the amp be in protect mode even when the Protect LED goes off after 1.5 secs.

I am waiting for parts from Newark. I ordered the ic driver 4420, op-amps, and opto-couplers. I was measuring 110v on the fets before i removed the FETS and IC Drivers. I also had a square wave on the inputs of the ic driver. The outputs on both 4420's were both positive ~9v and were not oscillating.
If both drivers are output a non oscillating +9v will that cause the 110v on the FETs?
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