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JL 600/1 v3 failure
JL 600/1 v3 failure
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Old 11th December 2016, 05:08 PM   #51
dhillman is offline dhillman
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Join Date: Nov 2015
Take them out, Q504 and 505 seems to be ok. Q506-07 are shorted through all legs no mater the direction of current.

Darrel
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Old 11th December 2016, 06:29 PM   #52
dhillman is offline dhillman
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Tested the PS with the heat sink in place, got 90vdc at pad 2 of Q504 & Q507, Q505 & Q506 reads 97vdc ag pad 2.

Let me know if you can suggest a better replacement FET for output, or if there is anything else that could be causing these FET's to short.

Darrel
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Old 11th December 2016, 10:07 PM   #53
Perry Babin is offline Perry Babin  United States
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I haven't had to replace any in that amp. The IRF3415 was reliable in a lot of 500s. I used the IRF3710Z in the 500s but the 90v rail in this amp is a bit too close to the max 100v of that transistor (I'd be concerned, even though the originals were 100v).

If anyone has a proven (not only 1 or 2 repairs) sub that works, they should post what they used.
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Old 12th December 2016, 12:28 AM   #54
dhillman is offline dhillman
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Join Date: Nov 2015
Thank you Perry. I will order 4 of both, and make sure the PCB is ok. The heat sink is so close to the soldered area that maybe they became grounded. Usually the reason for getting this transidtor shorted is either high voltage or high amps? Can you think of something else that is pushing these FET's to the limit? This power is driving 2 JL 10" subwoofer in parallel. They are both 4 ohms. It worked ok for 2 years +.

I'll order the parts and try again. Is there any way to buy the schematc of this unit or the 500/1 which is very similar?

Please reply, thank you. Darrel
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Old 12th December 2016, 12:39 AM   #55
Perry Babin is offline Perry Babin  United States
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JL doesn't release schematic diagrams.

Transistors can be damaged by excessive voltage (unlikely in this situation) or overheating of the internal die. Overheating can be caused by poor mating to the heatsink, a poor quality drive signal or too much current passing through them. Before you power the amp up normally, go back and test as suggested earlier (remote on for a couple of seconds then test within 10 seconds). This will allow you to see the drive signal with the outputs loading the drive circuits but won't allow the rail supply to power up. Testing before the main supply powers up helps protect the outputs if there is a bad drive signal.

You may want to give another day or so to see if anyone has any other suggestions for substitute outputs.
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Old 12th December 2016, 11:45 AM   #56
dhillman is offline dhillman
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Join Date: Nov 2015
Let me see if I understand. I can check with the Oscilloscope the drive signal at the pad 1 of each transistor? Do I need the jumpers at Q505-06? A bad signal would be a higher than normal frequency or a high duty cycle?

Please reply. Thank you. Darrel
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Old 8th November 2017, 11:06 AM   #57
Littlekenny206 is offline Littlekenny206
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Join Date: Nov 2017
How did that go I currently am attempting a repair on a 600/v3 and xd1000/1v2 was wondering if changing caps or any other upgrades can be done...and also having trouble finding the ntp6413ang mosfet ......but was curious to see if I could use "better" one throughout the board
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