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23rd June 2010, 06:36 PM
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#21 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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You need to check for continuity between the pads for the third legs of the 9640s to see if all are directly connected.
__________________
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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23rd June 2010, 06:53 PM
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#22 |
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diyAudio Member
Join Date: Jan 2010
Location: memphis tn
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they are all connected but one of the driver cards dose have a gain pot which i think is a bias.ive never worked on a amp that had one it may have been moved though cause the amp has been fixed before i got it.
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23rd June 2010, 07:00 PM
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#23 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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It's probably a DC offset pot.
If the driver boards that are in parallel with the outputs are in sockets, remove them after reinstalling the outputs (before applying power).
__________________
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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23rd June 2010, 07:33 PM
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#26 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The driver boards are the ones with the white heatsink compound on them.
__________________
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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23rd June 2010, 07:38 PM
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#28 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Yes. The driver transistors operate at very high temperatures and without the compound and the thermal gap pads, they are prone to failure.
__________________
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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