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9th November 2011, 01:29 AM
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#1 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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Massive P3000.1
I can not get one supply to power up. There is a header labeled J12, any ideas? J14 carries the remote from the first power supply. The output of the TL494 is garbage because I have no supply at the chip.
Interesting amp here, came to me with the rectifiers replaced with a TIP32 and two FQP50n06's. Not sure how they expected it to work!! 
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9th November 2011, 01:36 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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There is a header for the LEDs in the heatsink on some versions.
__________________
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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9th November 2011, 01:42 AM
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#3 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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I think I found the issue, Q17 was shorted. Marking was M6, am going to use an A56 in place.
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9th November 2011, 02:07 AM
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#4 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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That was part of the issue, the output of the TL494 is still garbage.
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9th November 2011, 02:41 AM
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#5 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Q17 and 18 are in parallel. If you replace one, you should replace both.
__________________
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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9th November 2011, 02:42 AM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Post a photo of the output.
__________________
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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9th November 2011, 12:28 PM
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#7 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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I replaced both, I can hear something click and see on the scope as if it wants to start up. Here is the output waveform. I do get a lower than normal -40V rail and nothing on the positive side.
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9th November 2011, 12:37 PM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you have a clean sawtooth waveform on pin 5?
__________________
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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10th November 2011, 12:50 AM
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#9 |
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diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
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The signal is there right away, but has noise riding with it. Then it disappears to essentially what the waveform I posted looks like.
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10th November 2011, 12:51 AM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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See if pin 7 is a clean ground (no noise or ripple).
__________________
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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