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DocumentsThe complete Mattel Synsonic Service Manual can be found at burnkit's Manual Library It is a 1.8Mb zip file of jpg images. From it I have extracted and, to the best of my ability, enhanced what I consider the essential information for understanding and modifying the Synsonic.The Schematic has been cleaned up and enlarged. The Waveform Charts were almost completely unreadable in the original state. I've enlarged and clarified whatever I could. Anything I was unable to interpret I've left as-is. The Component Layout Drawing has been enlarged. I faded the obscuring pc traces and hi-lighted points important to my modifications, present and future.
From the "Technical Description" I have extracted and put on one page the text relating only to Drum Sound Generator U3 and associated analog circuitry.
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