Power System Overview Theory of Operation
PageWriter TC 70 Cardiograph Service Manual 8-15
Battery Discharging
If no AC power is applied to the system, when the batteries are discharged to the 15% level,
the PageWriter TC70 cardiograph automatically enters standby mode and alerts the user to
apply AC power. When the batteries are discharged to a 12% level, the PageWriter TC70
cardiograph automatically shuts down.
NOTE The battery will continue to discharge when the cardiograph is not in use, or if the battery is stored
outside of the cardiograph.
Battery Charging
When the AC power cord is plugged in, the battery begins to charge. Check the charging status
through the Service Utilities. See “Running the Service Utilities” on page 3-35 for more
information.
Charge Current
When AC power is applied to the cardiograph, the batteries are charged at maximum 3A total
current. Check the charging current through the Service Utilities. See “Running the Service
Utilities” on page 3-35 for more information.
Battery Information
Battery information is sent from the battery charger, U1301. This information is then sent to
the host processor via SMBUS, and can be viewed from the Service Utilities screen. See
“Running the Service Utilities” on page 3-35 for more information.
Low Battery Power:
red battery icon appears when power level is between
20-30%
cardiograph beeps and an error message appears until
the unit is plugged into AC power
touch the icon to see how many minutes are left of
operating battery power
No or Dead Battery
Table 8-1 Battery Level Indicator Information (icon on Status Bar) (continued)
Battery Level Icon on Status Indicator
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