Troubleshooting - Agilent Technologies U1251A User's And Service Manual

Troubleshooting

WARN IN G
Malfunction
No LCD display after power ON
No beeper tone
Failed on current measurement
No charging indication
Failed on Remote control
Agilent U1251A/U1252A User's and Service Guide
To avoid electrical shock, do not perform any service unless you are
qualified to do so.
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.
• Check battery. Charge or replace battery.
• Check setup mode and verify if the beeper is set to OFF. Then select the
desired driving frequency.
• Check the fuse.
• Check external adaptor whether the output is DC 24V and plug into the
charging terminals completely.
• Line power voltage (100V~240V AC 50Hz/ 60Hz)
• 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.
Identification
Maintenance 5
115