Need Silent 700 schematic

My Silent 700 has decided to stop working. Some of the time. It won't print anything although it will move the printhead for CR, LF (but not space or any other printing character) and will sound the beeper from Ctrl-G (BEL). The keyboard is outputting all characters properly. I took it apart (easy since almost everything snaps in place), checked the power supply voltages which all seem reasonable, noticed it was working, put the case back on, now it's broke again. Aargh. Must be a cold solder joint somewhere but there's LOTS of parts inside that small case including an 8080 CPU. I removed the three socketed chips and reinserted. Then I incautiously got a finger on either 120VAC or rectified 150 VDC, in an area I was not expecting "hot" voltages. =8^0 At that point I decided not to play with it any more, at least without a schematic. Anyone got one, or a service manual? I can't locate anything online from Googling. thanks Charles