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There may not be any specific schematics in the wild but the flash should follow simple diagrams. If the flash is not responding, there may be a burnt out lamp, bad connection, or a leaking capacitor in the charge circuit. The neon indicator lamp is an important part of the circuit.
Here is a link to a typical flash schematic. The schematic should be similar to yours but there may be different batteries used and capacitor types used depending on their design:
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I am familiar with capacative discharge systems. What I am not acquianted with is the wiring from the missing hot shoe to the board. The 5 leads are color-coded, but there is no indication on the c board as to the termination point. My understanding is that the 636AF was used on several different makes of cameras and not all hot shoes used the same number of contacts, or were they wired in the same way.Obviously I need the correct schematic to fathom out what goes where. Any further would be appreciated. By the way, Vivitar no longer has this info. Thanks much so far,