Good evening friends...im working to this amplifier and i have the above problem...when i plug it with 13,8 volts it starts with 2 amps and immidiatelly getting down at 0.7 amps....after 15 seconds the draw is again 2 amps and the amp shut down...i have a similar amp and the 2 amps appears only when it beggins....then is working fine....i am confused with this...any help???
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If there are no defective output transistors, it likely has defective driver transistors. I can't see the circuit board designations but if it has two MPSA42s designated as Q124 and Q125, they would be suspect.
so i have the Q10K-Q11K, and Q8K-Q9K and the code is A42....is this the correct?they drive the output stage....FB31N20D the output fets....
there is no defective transistor or driver either output.....everything ok....i am very confused....some times when i touch him....appears the problem....????any ideas?
Did you check the drivers for leakage as well as open junctions?
Did the solder connections for the drivers show signs of heat stress?
Did the solder connections for the drivers show signs of heat stress?
no heat or bad sholders....and the driver transistor are not shorted or open or leakage....i ve check them twice....i suspect the pcb for damage....because even i touch it in any place appears the problem.... i dont know....
Intermittently shorted output filter inductors?
Broken legs on the output transistors (possibly inside the body of the transistor)?
Broken legs on the output transistors (possibly inside the body of the transistor)?
these amps its a big mess....and the second one appears problem too....no output....and guess what...!!!!no defective output transistors....the worse quality ever...
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