. . Taming the famous (and famously tacky AND tricky!!!), wonderful #Publison #InfernalMachine: HURRAYYYYYYYY!!!!! VICTORYYYYYYYY!!!!! CHANNEL A IS WORKING AGAIN, AT LAAAAST!!!!!!!!! ππππππππππππππ . I feel SOOOOO relieved to have FINALLY found the (effectively) "missing link": a track on Channel A's DSP board was cut between two chips (an LS393 dual 4-bit binary counter and its driving LS73 dual J-K flip-flop), so that the DSP chip never had access to the DMA circuitry to process, send to the 64 memory chips and then back to the DAC channel A's 16 bits of digital audio!!!! π₯π₯π₯ . The cut was barely visible, on a track that is very fine in width (as are 95% of all the other tracks on that board, by the way)... π¨ . Thanks to having redrawn the needed section of the schematics (daunting task it is! and it's just a SMALL part... πͺ see upper right picture) using the other, working channel's board as a model, I've been able to trace down the missing link and then fixed it with a short Kynar wire (upper left picture) πππ . Now channel A is FINALLY back to work!!!!! ππππ ...and I know someone at @soundgasltd who might be as much happy as I am! βΊοΈ . #PublisonSystems #IM90 #InfernalMachine #PublisonInfernalMachine #PublisonIM90 #VintageDigitalFXBox #VintageDigitalMultiFXBox #FirstCommercialProAudioOutboardWithDSPs #SoundGasLtd #SoundGas #SoundGasUK #Repair #PiscineATokyo #StudioPiscineATokyo #TheGoodDoctorPrager #LeBonDocteurPrager https://www.instagram.com/p/BuEP5sHF0P-/?utm_source=ig_tumblr_share&igshid=168h195yauqx7
