138 U1253B User’s and Service Guide
5Maintenance
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
[1]
• Check 440 mA fuse.
• Check external DC adapter to ensure that its output is DC 24 V and that the
plugs are inserted properly into the charging terminals.
Battery life very short after full
charge/Battery not able to charge
after pro-long storage period
• Check if the correct rechargeable battery is used.
• Try to charge and discharge for 2 or 3 cycles in order to maintain the battery’s
highest capacity.
•NOTE: The performance of the rechargeable battery may degrade with time.
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.
Notes for basic troubleshooting procedures table:
1 Never turn the rotary switch of the multimeter from the OFF position when it is charging.
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