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14th December 2011, 04:03 AM
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#1 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Rockford BD1000
Hello everyone.
I have a BD1000 I am working on. Whats been done so far: All output fets and gate resistors have been replaced. One MIC4420CT has been replaced. RCA jacks have been replaced. U17 LM6171 has been replaced. The amp idles fine, does not draw excess current and produces sound and hits very hard like normal. Problem: The amp has a strange noise in the background of the speaker. Its hard to explain almost sounds like change rattling in the cup holder when the bass hits if that makes sense. The output is not totally clean on the scope. I posted a few pics. First pic is low volume, second pic is half volume. Someone correct me if I am wrong but am I viewing oscillation here? Scope settings were 20volts/div and 2ms Where should I check next?
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Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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14th December 2011, 07:26 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you have clean audio on pin 1 of u4?
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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14th December 2011, 07:31 AM
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#3 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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I have no audio on pin 1 of U4.
__________________
Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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14th December 2011, 07:33 AM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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That's the last point in the preamp audio chain. You have to have audio there if you have output from the amp.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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14th December 2011, 07:42 AM
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#5 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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I moved the scope down to 1v/div 2 ms and I get a signal. It looks clean but the line is a little hazy or blury if you will. When ever I increase the volume there is a very loud buzzing in the amp almost like from the outputs or something.
__________________
Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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14th December 2011, 07:44 AM
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#6 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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I suppose the other MIC4420 driver could be bad I did not test it or replace it just the one, U6
__________________
Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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14th December 2011, 07:53 AM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you have a clean square wave out of the two op-amps that drive the opto-couplers?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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14th December 2011, 07:56 AM
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#8 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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U9 and U15? Pins 1 and 7?
__________________
Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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14th December 2011, 07:57 AM
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#9 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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U5 and 8, pin 6.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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14th December 2011, 08:01 AM
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#10 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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When I touch the scope to either op-amps pin 6 the signal leaves the screen.
__________________
Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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