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27th September 2012, 03:08 AM
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#11 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Here is a photo, keep in mind I have not removed this board from the heat sink yet to inspect the bottom of the board.
__________________
Pyramid 52 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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27th September 2012, 07:16 AM
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#12 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you read 0 ohms between the two points indicated by the arrow?
Are you using the inner terminal as the positive speaker terminal?
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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27th September 2012, 09:06 AM
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#13 | |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Quote:
I read 0 ohms between the arrows in the pic and I read 0 ohms from the pads to the + speaker terminal.
__________________
Pyramid 52 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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27th September 2012, 09:11 AM
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#14 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Touch a dummy load across the speaker terminals to see if the 2v drops to 0v and remains there after removing the dummy load.
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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27th September 2012, 09:29 AM
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#15 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Yes touching a dummy load to the terminals drops the dc to 0 but it returns when the load is removed.
__________________
Pyramid 52 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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27th September 2012, 09:46 AM
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#16 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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If the current draw doesn't increase when you touch the dummy load, the output stage is likely OK.
Is either Q125 or Q126 leaky? Check all of the resistors on the part of the diagram shown below to confirm that all are within tolerance.
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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28th September 2012, 06:39 AM
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#17 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Q125 and Q126 were not leaky. Every resistor I tested was removed from the circuit and all tested within tolerance. Some reason my voltage has jumped up to over 3vdc now.
__________________
Pyramid 52 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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28th September 2012, 06:49 AM
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#18 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Reinstall Q125/6. Post the DC voltage on all 3 terminals of Q101, 102 and 103.
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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28th September 2012, 07:46 AM
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#19 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Q101
B: -1.624 C: +14.54 E: -1.620 Q102 B: -1.820 C: +23.99 E: -2.320 Q103 B: -3.878 C: -2.520 E: -4.47
__________________
Pyramid 52 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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28th September 2012, 06:12 PM
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#20 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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With the black probe on the negative speaker terminal. what is the DC voltage on the positive terminals of C108 and C110?
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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