Maintenance 5
Agilent U1251A/U1252A User’s and Service Guide 115
Troubleshooting
If the instrument fails to operate, check the battery and test
leads. Replace them if necessary. And if the instrument still
doesn’t function, check the operating procedure in this
instruction manual. When servicing, Use specified replace-
ment parts only. The table below will assist you to identify
some basic problems.
WARNING
To avoid electrical shock, do not perform any service unless you are
qualified to do so.
Malfunction Identification
No LCD display after power ON
• Check battery. Charge or replace battery.
No beeper tone
• Check setup mode and verify if the beeper is set to OFF. Then select the
desired driving frequency.
Failed on current measurement
• Check the fuse.
No charging indication
• Check external adaptor whether the output is DC 24V and plug into the
charging terminals completely.
• Line power voltage (100V~240V AC 50Hz/ 60Hz)
Failed on Remote control
• The optical side of cable connected to meter, the text side of cover should
be up.
• Check the baud rate, parity, Data bit, Stop bit (default is 9600, n, 8, 1)
• Driver install for USB- RS232.
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