![]() Two of the voice outputs, on the VX-90 at least, go to R148 and 149 who sum to section one of IC41, another dual op amp. The output of each of these goes to a 10K resistor. So they just have a feedback resistor in other words and a direct connection to pin 19 of the CEM3394 on the inverting input. Each section is a current to voltage converter for the CEM3394 outputs. the VX90 I'm working which won't tune and has bad sounding noisy output but DOES seem to be trying to generate sound) then note that there are three dual op amps (5218's) near the voice chips. ![]() If there is a problem after the voice chips (eg. So if you have a voice related problem start by swapping those and monitor signal on the voices to see if the problem follows the chip or the channel. Otherwise these look like a solidly built unit with of course the CEM3394 synth on a chip. I initially thought something else might be wrong. Auto-tune takes care of the 'misplaced note' syndrome so fear not :-). Easy common sense repair and some buttons will get dirty. Had to use goop adhesive to stick the boards together again and clamp til dry then wire over broken connections. Buttons get stiff and people hit them with the sledgehammer. The one I got had cracks in the front board. Inputs for their samplers to give access to the analog e Chung's page for pinout. Also it has a velocity sensetive 73 key keyboard. General Info Links: Vintage Synth ExplorerĪ digitally controlled analog subtracive synth which is near identical in capabilities to AX60 but without sliders though it is fairly uncluttered at least and simple to use. Uncommon chips/modules used: CEM3394 synth on a chip, LM13600 ota, MN3009/MN3101 BBD/Clock, A6082S op amps (these are just 082 dual op amp in a symmetrical package it appears.) IR9311 comparator (a 311 apparently by sharp), M5230L voltage regulator. Parts Sources: Keys knobs semiconductors misc Scematics/Service Manual: Transanalog (Nice high quality prints) User Manual: Manual Manor or email me for. ![]() Technical assistance Akai AX73 /VX-90 -1986 Weight = 30.5 Lbs. ![]()
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