GE MAC 3500, Service Manual, Page: 56 / 180

4-16 MAC™ 3500 Resting ECG Analysis System
Revision L

2021337-036
Troubleshooting: Diagnostic Tests
Battery Test
Battery tests check the current battery status, battery discharge rate and battery
charge rate. Test results are stored in memory and can be printed out. The graphic
displayed shows the
Battery Test menu. Each test is covered in detail below.

Battery Status . This test displays and constantly updates current information on
the battery voltage, battery current, percent of charge remaining and battery
temperature.

Battery Voltage . With a reading of 80% or more for the percent of charge
remaining, the battery voltage should be between 15 and 24 volts. If battery
voltage is below 15 volts, the battery may need to be replaced.

Battery Current . Disconnect AC power. If the battery current is less than -
0.7 amps, the main CPU may need to be replaced. For example if current is
-0.8 amps, consider replacing CPU. See
“Main CPU Board Replacement”
on page 5-22.

Battery Temperature . A temperature reading over 45° C indicates a failure.
If battery temperature is more than 10° C over the ambient temperature
consider replacing battery.

Ambient Temperature . Indicates the temperature inside the unit. The
temperature displayed is accurate to 5°C in the range of 0°C to
50°C. Ambient temperatures not within this range cannot be displayed.
19A
20A