Maintenance 5
Keysight U1251B and U1252B User’s and Service Guide 143
Troubleshooting
If the instrument fails to operate, check the battery and the test leads. Replace
them if necessary. And if the instrument still does not function, check the
operating procedures in this manual. When servicing, use only specified
replacement parts. Table 5-5 below will assist you to identify some basic problems
and their solutions.
WARNING
To avoid electrical shock, do not perform any service on the device unless
you are qualified to do so.
Table 5-5 Basic troubleshooting procedures
Malfunction Troubleshooting procedure
No LCD display after power ON – Check the battery. Charge or replace it.
No beeper tone
– Check the setup mode to verify if the beeper is set to OFF.
Then select the desired driving frequency.
Fail on current measurement – Check the fuse.
No charging indication
[a]
– Check 440 mA fuse.
– Check the external adapter to verify if the output is DC 24
V and the adapter is plugged into the charging terminals
completely.
– Line power voltage (100 V~240 V AC 50 Hz/ 60 Hz).
Battery life very short after full charge/Battery not able to
charge after prolong storage period
– Check if the correct rechargeable battery is used.
– Check if the correct nominal voltage level (7.2 V or 8.4 V) is
selected in the battery setting at Setup Mode.
– Try to charge and discharge for two or three cycles in
order to maintain the battery’s highest capacity.
– NOTE: The performance of the rechargeable battery may
degrade with time.
Fail on Remote control
– Check that the optical side of the cable is connected to the
meter and the text side of the cover is up.
– Check the baud rate, parity, Data bit, Stop bit (default is
9600, n, 8, 1)
– Driver install for IR-USB.
Notes for basic troubleshooting procedures table:
[a] Never turn the rotary switch of the multimeter from the OFF position when it is charging.
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