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Kicker zx1500.1d power supply and outsection.
Kicker zx1500.1d power supply and outsection.
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Old 29th October 2018, 10:16 PM   #1
rhempz01 is offline rhempz01  United States
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Default Kicker zx1500.1d power supply and outsection.

I have a zx1500.1 that burnt up all the power supply mosfets and shorted the output section. I can get it to just power up without any mosfets in the amp. I replaced both 5402 diodes. Same result.
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Old 31st October 2018, 03:12 AM   #2
PapaZBill is offline PapaZBill  United States
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Without the mosfets, check with your scope to see if you are getting drive to the power supply mosfet gates. Post a screen shot.

In my experience replacing shorted outputs and power supply mosfets with same date codes usually fixes the amp. Checking the drive will determine if the driver transistors and or the timing capacitor needs replacing. I will check schematics and post the Locators and value/part numbers tommorow.
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Old 31st October 2018, 03:19 AM   #3
rhempz01 is offline rhempz01  United States
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ok will do, I have them all out of cuircuit with no outputs or power suppy mosfets and it just draws current, despite changing the shorted diode. I was told that B+ touched ground? Seems more likely it was run at avery low indepence load. The power supply is burnt badly. I worked on this amplifiers output section a few years ago.
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Old 31st October 2018, 06:23 PM   #4
PapaZBill is offline PapaZBill  United States
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The D25 and D26-1N5402 are across the power terminals-B+or Battery terminal to Ground terminal, which is there to protect against reverse polarity, but can be a casualty when there is an excessive load or improper fusing and under rated cable gauge. So, you may be right, shorting the B+ to ground should not have caused the diodes to short.
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Old 3rd November 2018, 01:01 PM   #5
rhempz01 is offline rhempz01  United States
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No outputs and no power supply mosfets still in protection? Draws 8.67amps of current. Should I remove the class d board and tr that way?
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Old 3rd November 2018, 07:09 PM   #6
PapaZBill is offline PapaZBill  United States
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Using the edited pic check the sawtooth and drive waveforms and post screen shots of sawtooth, drives at Pins 9 & 10 of the TL494, one screenshot of each bank of the mosfet gate pads.

Also, Check the DC Voltages of the pins on the TL494, using power ground for the black probe of meter.

Check the rectifier diodes with an ohmmeter.
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Old 3rd November 2018, 09:46 PM   #7
rhempz01 is offline rhempz01  United States
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Ok this amp does not power up properly. It draws 8amps with no class d board and no mosfets at all. Rectifiers are ok. This amps power supply and outputs were shorted. +- voltages are not present. On the pads for the class d board nor the preamp board.

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Old 5th November 2018, 06:23 PM   #8
PapaZBill is offline PapaZBill  United States
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There are a number of things that may be causing an 8 amp draw.
Q12,Q13 shorted, check these mosfets first.

Check to be sure you have no solder bridges on the power supply mosfet pads and check the 1N5402's to be sure you have them installed properly.

Shorted windings on one of the power transformers(Twisting and turning the transformers may bear this out).

Shorted or leaky input capacitors(C29-36) or L4.L5 may have damaged cores or shorted windings.(If you don't see any obvious shorts and twisting and turning transformer doesn't change current draw pull inductors out one at a time. Check across the capacitor bank(C29-36) if shorted you will have to remove each cap one at a time.

I may be missing something, I will continue to ponder this. If anyone has any input it would be most welcome. It's an unusual problem!!
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Old 5th November 2018, 06:48 PM   #9
rhempz01 is offline rhempz01  United States
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Q12-Q13 test good. I can say that if I set my meter to diode test mode and black on ground and b+ red the caps do not charge normally as they should, it rises, fails, rises, fails.
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Old 5th November 2018, 09:12 PM   #10
rhempz01 is offline rhempz01  United States
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1N5402 installed
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