User's Manual

108 Agilent U1251A/U1252A User’s and Service Guide
5 Maintenance
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 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
[1]
• Check 440 mA fuse.
• Check the external adaptor to verify if the output is DC 24 V and the adaptor is
plugged into the charging terminals completely.
• Line power voltage (100V~240 VAC 50 Hz/ 60 Hz).
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.
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:
1 Never turn the rotary switch of the multimeter from the OFF position when it is charging.