[...], but I generally like to have schematics (if
possible) before
tearing into something.
Sure...but don't forget that any schematics you'd get would describe
what an 874-D was originally supposed to be. There are any number of
reasons why that might differ from what the particular unit you have
currently is.
Not that a supposed-to-be schematic is worthless, of course; just
pointing out that you likely would want to do at least some
verificatory tracing anyway, so creating your own schematic may not be
all that much extra pain....
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