141 XFC G4 2103335 Rev AB
7.2.1 Troubleshooting a Blank LCD Screen
When the LCD is blank, this means that the unit has entered SLEEP mode. This generally indicates the battery voltage has
dropped below 10.9 Vdc.
Equipment needed:
-Digital Multi Meter
To troubleshoot a blank LCD screen:
Connect the PC running PCCU32 to the flow computer with either an MMI cable (RS-232), a USB cable or an
Ethernet cable. This wakes up the unit so that the user may check all alarm conditions.
Check battery pack cable. It must make a good secure electrical connection with the main electronic board BATT
CONN connector J1 (Figure 96:).
Check battery pack cable is securely connected.
Check battery pack voltage. If voltage is low, replace with another battery pack.
If voltage is still low, investigate power issues following the Power Troubleshooting Flow Chart (Figure 97:).
Figure 96: Battery Charger and Battery Pack Connections
7.2.2 Troubleshooting a Low Lithium Alarm (LL)
When the Low Lithium alarm appears, the lithium battery should be replaced immediately, see section 6.6, Replacing the lithium
battery, page 113.
NOTICE – Loss of data. Failure to replace lithium battery could result in loss of data, following a power loss.
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