General:
	Batteries/chargers Common problems and known issues RS232 output protocol
Circuit Diagrams (alphanumeric list):
	C401 C420 C450 C600 / C601 C700 C720 C800 series C800 Raystar LCD C800 upgrades C800 bell button connections D60B - Judge's remote display with start/stop/bell/countdown buttons D504 D505 / D605 D510 / D610 D510 digit replacement D510 pcb replacement DX display radio link K10 bell K11 bell K20 display test set K30 time-of-day clock / marathon timer K60 remote start/stop/bell/countdown buttons K506 K515 K530R - wire-free receiver K530T - wire-free head K530 aerial replacement K531 / K532 K5xx - head trouble-shooting K5xx - head testing procedures Q232 RS232 interface Miscellaneous drawings