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Rockford Power 1000  Output Fet Issues?
Rockford Power 1000  Output Fet Issues?
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Old 21st February 2019, 11:49 PM   #1
neonarossa is offline neonarossa  United States
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Default Rockford Power 1000 Output Fet Issues?

I fixed 2 channels. Now with current limit the rail voltage fluctuates. With full current its steady> but< several 2n5551,2n5401 drivers and several 47ohm resistors get hot.
These are the original,replacement and test results. Possible incompatible issue..
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Old 22nd February 2019, 04:29 AM   #2
Perry Babin is offline Perry Babin  United States
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I don't know about this amp but the N version of the IRF540 was incompatible with other Rockford amps.
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Old 22nd February 2019, 11:46 AM   #3
neonarossa is offline neonarossa  United States
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I can't find the non-N. Order from several suppliers and they all send n-version. I found a 2n5551 leaking and a 2n5401 shorted. Rail voltage is stable now. When full current is applied without limiter, current shoots up 14 + amps. Did not let it idle long. Not sure if it will idle back down..
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Old 22nd February 2019, 11:57 AM   #4
Perry Babin is offline Perry Babin  United States
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Did you set the bias pots fully CCW to see if that made a difference?
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Old 22nd February 2019, 01:02 PM   #5
neonarossa is offline neonarossa  United States
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No. I will..thNks
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Old 23rd February 2019, 12:07 AM   #6
seankane is offline seankane  United States
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Which power 1000 are you working on?
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Old 23rd February 2019, 01:22 AM   #7
jkrokenberger is offline jkrokenberger  United States
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I've got 2 IRF540's - no N - that I could send you if it would help.
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Old 23rd February 2019, 03:34 AM   #8
neonarossa is offline neonarossa  United States
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The Original 1st build. Black with the caboose. I have had it about 12yrs. Unfortunately my son kept asking to use it and blew it. I replaced the 1 new blown irf540n. Now i have 25v. On the left rear output. "Almost Done Again"!!😃 This is my 3rd time repairing!! Started fixing amps in 1991.
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Old 23rd February 2019, 03:43 AM   #9
neonarossa is offline neonarossa  United States
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Default Thanks. I appreciate the offer.

Quote:
Originally Posted by jkrokenberger View Post
I've got 2 IRF540's - no N - that I could send you if it would help.
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Old 23rd February 2019, 08:33 PM   #10
neonarossa is offline neonarossa  United States
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I turned the pots all down. Idle current went from appx. 2.8v to appx. 1.6v.. 25v speaker out fixed.
+Rail= 45.5v -Rail=48.9v
(3 of 4 irf540n had leaked). The same 2n5551& 2n5401 still get hot after a while? Have tested everything many times over the years.. Any help to "Finally fix this heat issue" I would greatly appreciate.
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