Roland Micro Cube fix

[CJ]

these micro cubes are fun but they pop if you look at them wrong, no schematics anywhere for the micro cube, this one powering on but was not making any noise,

had a hard time finding the output transistors or chips, finally figured it out with a continuity checker working backwards from the speaker terminals, though some inductor thingys and finally to the chips, (red arrows, inductor is yellow arrow, there are 4 of them,)
the numbering on the chips did not turn up on any searches,

IC 6 is one of the power amps,

 

[CJ]

i think that the heat from the chip amps must have loosened the series inductor solder joints,

so i had some hi freq suppressor ferrite inductors laying around, i ran some wires to the board and it started working with the heavy duty inductors, orig shown next to yellow ferrite core,

i tried it by jumpering the inductors, it worked for a while, then started making crackling noises and the chips got real hot, so the inductors are needed to suppress some RF things going on,

put some 20 Nomex for core pads and guitar picks for retainers,

Happy Holidays!