2
Service and Maintenance
60
Keysight U1281A/U1282A Service Guide
Troubleshooting
If the multimeter fails to operate, check the batteries and the test leads. Replace
them if necessary. If the multimeter still does not function, check the operating
procedures in this manual. When servicing, use only the specified replacement
parts.
The table below will assist you in identifying some basic malfunctions.
WARNING
To avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
CAUTION
Any repair or service which is not covered in this manual should only be
performed by qualified personnel.
Table 2-1
Operating checklist
Malfunction
Identification
No display when powered ON using the rotary switch – Verify the condition of the batteries and replace batteries as necessary.
No beeper tone
– Verify that the beeper is enabled in the multimeter’s setup mode.
Failed on current measurement
– Verify the condition of the fuses and replace the fuses as necessary.
Failed on remote control
– Verify the optical side of the IR-USB cable connected to the
multimeter — the Keysight logo should be facing up.
– Verify the baud rate, data bit, and parity settings in the multimeter’s
setup mode. (Default values are 9600, 8, and none.)
– Verify the driver for the IR-USB interface.
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