I receiver a BASH subwoofer amp to repair, and the smps was (is) dead. One mosfet was shorted and D2 was turned black (see schematic below). I was unable to determine the original part no. of D2 or the orientation, so I installed another 4148 (silk-screen actually shows cathode on both ends...) in series with D1.
All of the resistors, except for R2/3/12/13, were turned dark green due to heat (originally bright blue). All resistors were still within tollerance, but I decided to replace them all, along with both fets and the lone transistor.
I am pretty sure the taps for C4/5 on the primary are shown wrong on the schematic, but it should still give a good idea.
1N5245B = 15V zener
All of the resistors, except for R2/3/12/13, were turned dark green due to heat (originally bright blue). All resistors were still within tollerance, but I decided to replace them all, along with both fets and the lone transistor.
I am pretty sure the taps for C4/5 on the primary are shown wrong on the schematic, but it should still give a good idea.
1N5245B = 15V zener
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jtkraj said:
What I wanted was an opinion on why it still doesn't work, and possibly why. As the title says, I have been unable to repair it so far.
adi109cj said:
Thank you, I will try replacing it once I order some parts. I guess the diac symbol would explain the double cathode on the silkscreen.
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