HP 19C Printer

[Katie Wasserman]

(04-06-2014 03:32 PM)hoshikawa Wrote:  I am making some progress, this transistor is open base to emitter. now to find a suitable replacement.

The 3-393 is likely an abbreviation of an HP part number. Here's an old thread discussing this. There's some conflicting info in this thread, the suggested 2N3330 might not be the correct replacement; Tony suggests that it's a Silicon PNP but a 2N3330 is JFET.