Keysight Technologies U5855A, Service Manual

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3 Troubleshooting and Repair
Operating and Troubleshooting Hints
22 U5855A Service Guide
The following table explains the error messages that may appear on the
U5855A screen and their solutions.
Table 3-2 Error messages
Error message Error description Troubleshooting procedure
Low battery The battery is draining. Charge the battery, or turn off the power and
replace the battery.
Lens temp error The internal temperature sensor fails to
operate properly. Turn off and on the power several times. If the
error still occurs, return the U5855A to
Keysight for servicing.
Visible com error I2C communication error of the CPU and the
visible image occurs. Turn off and on the power several times. If the
error still occurs, return the U5855A to
Keysight for servicing.
SD card access error Access error of the CPU and the SD memory
card occurs. Replace with a new SD memory card. If the
error still occurs, return the U5855A to
Keysight for servicing.
Backup memory error I2C communication error of the CPU and
EEPROM or check sum error occurs. Turn off and on the power several times. If the
error still occurs, return the U5855A to
Keysight for servicing.
Correction memory error Check sum error occurs on the temperature
calibration data. Turn off and on the power several times. If the
error still occurs, return the U5855A to
Keysight for servicing.