Lanzar Vibe 1200D turns on NO OUTPUT

[BrownVanMan 10+ year member]

how do i go about troubleshooting this amp? amp powers on and looks fine. NO output voltage. other amps in same set up work fine.

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[BrownVanMan 10+ year member]

help

 

[Spooney 10+ year member]

Have you tried wiggling the rcas to see if the signal cuts in and out? Do you have a multimeter? Seen plenty of amps that powered on normally and although they weren't in protect the output fets or at least a part of the output circuit was defective/blown. Can you post pics of the inside of the amp?

 

[BrownVanMan 10+ year member]

I will get pics but I looked at the board before I hooked it up. How do I check for blow outputs? Yes I have a multimeter.

 

[Spooney 10+ year member]

With the amp off and not hooked up to power or ground set your meter to continuity check and start testing the output fets for shorts between the legs on each individual transistor. They will all have three legs. Any shorts between any combination of those three legs indicates a bad fet. If you find one bad fet you most likely have several. If you post pics I can tell you what fets are outputs and which ones are power supply.

 

[BrownVanMan 10+ year member]

going to get pictures tonight. so any continunity means the fets are bad? and if what ive read is true if the fets arent bad its most likly the power supply.