HP82240A Hardware

[TomC]

Is anyone familiar with the early variants of the 82240A Hardware?

Existing Documentation (the very fine T.Duell schematics) show a KA2183 device as the IR front end IC.

I've disassembled an 82240A and the IR front end is a TDA3047. I have the datasheet for this part, and am curious about the subsequent circuitry in the printer. It appears that the output of the TDA3047 connects to the base of a TO92pkg transistor. Before sliding down the circuit re-construction path, I would be curious is anyone else has traced this circuit and can share their findings.

Thanks,
TomC