Welch Allyn RL-100 Rhinolaryngoscope - User Manual - Manual (Page 6)

BACK VIEW
VIDEO INPUT - LINES “A” AND “B”
BNC Type couplings (male) for connecting coaxial video cable for
input and output of composite (NTSC) video. These connectors
will be used for input out of a standard VTR for display of recorded
images.
VIDEO INPUT - LINE "C"
4 pin mini DIN type coupling for connecting Y/C(S-VHS) video. This
connector is used to couple high resolution Y/C video directly from the
camera control unit to the monitor.
PREPARATION
ASSEMBLING CAMERA / C-MOUNT ADAPTOR
AND
EYEPIECE COUPLER
*Remove (unscrew) the front cap of the camera head and confirm
that the surface of the optical filter of the camera is clean. If the
surface of the optical filter is dirty or there is dust on it, clean with
the lens cleaning tissue paper provided.