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Old 7th July 2012, 05:04 AM   #1
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Join Date: Jun 2012
Default Lanzar MXA282

This amp is in protection mode all outputs test fine..

Heres what i get on the 494


Pin 1: 0.04
Pin 2: 4.99
Pin 3: 4.74
Pin 4: 0
Pin 5: 1.49
Pin 6: 3.46
Pin 7: 0
Pin 8: 13.91
Pin 9: 0
Pin 10: 0
Pin 11: 13.91
Pin 12: 13.16
Pin 13: 4.99
Pin 14: 4.99
Pin 15: 4.99
Pin 16:11.16


Any suggestions on what to look at?
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Old 7th July 2012, 05:29 AM   #2
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Join Date: Nov 2003
Location: Louisiana
Something is driving pin 16 high. That's shutting the supply down.

Post a photo of the board.
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Old 7th July 2012, 08:45 PM   #3
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Heres a couple of pics ..

When i try to power the amp up the power light comes on for 2 secs then fades out and amp shuts right off
Attached Images
File Type: jpg lanzar.JPG (570.5 KB, 76 views)
File Type: jpg lanzar 1.JPG (775.7 KB, 66 views)
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Old 7th July 2012, 08:56 PM   #4
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Join Date: Nov 2003
Location: Louisiana
Post the DC voltage on all 8 pins of the IC next to the TL594.

IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
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Old 7th July 2012, 09:02 PM   #5
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IC# JRC 2904D

Pin 1: 0
Pin 2: 12.31
Pin 3: 6.52
Pin 4: 0
Pin 5: 11.48
Pin 6: 4.99
Pin 7: 11.56
Pin 8: 13.15
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Old 7th July 2012, 09:21 PM   #6
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Join Date: Nov 2003
Location: Louisiana
Have you checked all of the output transistors to confirm that none are shorted?
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Old 8th July 2012, 01:25 AM   #7
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Location: Anchorage AK
lol, just repaired the exact amp a couple months ago. anyways, looks like this one has been repaired before, especially obvious with the one mismatched rail cap (the black one.) the 2 on the other side look to be bad, or going south. is that leakage below them? also, look at the one above r203. i would also check the to-220 drivers between the top outputs in the pic. it looks like one might be touching the screw, or the other could be contacting beyond the pad. all i can see.
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Old 10th July 2012, 12:06 AM   #8
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I found the drivers for the power supply fets to be defective..

The amp uses IRFZ44V's for the fets with 100 ohm gate resistors..

The amp is using A1015 and C1815 as the drivers..

Are there any good subs for the drivers?
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Old 10th July 2012, 12:11 AM   #9
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Location: Louisiana
Are you sure that they're defective?

It's rare for the drivers to fail if the FETs are not defective.
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Old 10th July 2012, 01:52 AM   #10
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Positive they are defective amp draws excessive current when trying to power up so i removed the drivers and they are shorted from legs 2 to 3
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