Operating And Troubleshooting Hints - Keysight Technologies TrueIR U5855A Service Manual

3 Troubleshooting and Repair

Operating and Troubleshooting Hints

Operating and Troubleshooting Hints

To avoid electrical shock, do not perform any servicing on the U5855A unless you are
WA R N I N G
qualified to do so.
If the U5855A fails to operate, check and replace the battery if necessary.
And if the U5855A still does not function properly, check the operating
procedures in the User's Guide.
The following table helps you identify some basic problems and their
solutions. Proceed with the described advice.
Table 3-1 Troubleshooting hints
Malfunction
The U5855A does not turn on.
No thermal images displayed.
The thermal image is abnormal
(the previous image still remains).
18
Probable cause
Power is not supplied to the U5855A.
The external shutter is not opened
properly.
The infrared (IR) sensor fails to operate
properly.
The internal shutter is not opened
properly.
Troubleshooting procedure
Check if the power cord is properly
connected to the AC power adapter.
Check if the power cord is properly
connected to the mains power outlet.
Check if the AC power adapter is operating
normally. If not, replace the adapter.
If the U5855A is running on battery, check
the battery condition.
Check if the battery is properly installed in
the U5855A.
If the battery is empty, charge the battery.
Open the external shutter fully and lock it
in place.
Return the U5855A to Keysight for
servicing.
Check if there is a sound of the internal
shutter closing when switching from the
freeze mode to the run mode. If no, return
the U5855A to Keysight for servicing.
U5855A Service Guide