Novametrix Medical Systems 515 Service Manual page 10

Theory of OperationPower Supply Board
Service Manual: Model
resentation as shown below, each block is described in detail. Reference pi
2503-01, 2503-03 to follow the circuit descriptions.
RS232
INTERFACE
AC/BATTERY OPERATION
The model 515 monitor is capable of either AC mains operation, or op
tion from an internal battery. When the line cord is connected and the rear ]
el power switch is on (I position) a green LED on the front pane
illuminated. This indicates that the AC portion of the power supply circuit!
powered and the battery is being charged. When the mains power is remc
the unit operates under battery power supplied by an internal lead acid i