136 U1253B User’s and Service Guide
5Maintenance
Troubleshooting
If the instrument fails to operate, check the battery and test
leads. Replace them if necessary. After that, if the instrument
still does not function, check to ensure that you have followed
the operating procedures given in this instruction manual,
before considering servicing the instrument.
When servicing the instrument, use only the specified
replacement parts.
Table 5- 5 will assist you in identifying some basic problems.
To avoid electric shock, do not perform any servicing unless you are
qualified to do so.
Table 5- 5 Basic troubleshooting procedures
Malfunction Troubleshooting procedure
No OLED display after switching ON • Check battery. Charge or replace battery.
No beeper tone • Check the Setup mode to verify whether the beeper function has been set to
OFF. If so, select the desired driving frequency.
Failed to measure current • Check the fuse.
No charging indication • Check external DC adapter to ensure that its output is DC 24 V and that the
plugs are inserted properly into the charging terminals.
Remote control failure • The Agilent logo on the IR-USB cable connected to the multimeter should be
facing up.
• Check the baud rate, parity, data bit, and stop bit (default is 9600, None, 8, and
1) in the Setup mode.
• Ensure that the required driver for IR-USB has been installed.
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