Mr Do audio problem

Quattrohead

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Jul 6, 2004
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I have a Mr Do that seems to be missing all of the musical sound, I get beeps that are the correct sound but not the full range of sound from the game.
Looking at the schematic and the board, I think C5 and C6 are worth changing as they both look in rough shape and perhaps 1 is bad, hence missing half the sound.
But I see they are non polorized 1uF electrolytic , so should I replace with a standard 1uF and insert which way or can I series 2 together with + connected to "make" a non polorized capacitor.
The other alternative is a poly or ceramic as large as possible.
 
I have not got any further yet due to eye injury but bumping incase anyone else has input
 
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