I can't help you with the manual but the rear panel is fairly simple and versatile...
http://gear.ign.com/dor/objects/481812/tdk-da-3826/images/tdk_da3826_io_scheme_big.html
Like any other recording device it has IN's and OUTs, but in this case there are two distinct units in the case - a Player and a Recorder.
You have analog in's and outs that accept standard Line Level RCA patch cords.
Coaxial Digital connectors carry standard digital audio in or out; ditto the Optical connectors.
I imagine that, being a dual deck, it has internal digital routing for copying from the Player to the Recorder.
I also imagine it requires CD-R AUDIO blank media for making recordings; not computer CDR's.