2 Service and Maintenance
Troubleshooting
30 U1231A/U1232A/U1233A Service Guide
Troubleshooting
If the instrument fails to operate, check the batteries 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 the
specified replacement parts.
The table below will assist you in identifying some basic
malfunctions.
To avoid electrical shock, do not perform any service unless you are
qualified to do so.
Table 2 - 1 Operating checklist
Malfunction Identification
No display when powered
ON using the rotary switch
❏ Verify the batteries health and replace
batteries as necessary.
No beeper tone
❏ Verify that the beeper is enabled in the
multimeter’s Setup mode.
Failed on current
measurement (U1232A or
U1233A models only)
❏ Verify the fuses health and replace the fuses
as necessary (see “Checking the Fuse” on
page 31).
Failed on remote control
❏ Verify the optical side of of the IR-USB cable
connected to multimeter — the Agilent logo
should be facing up.
❏ Verify the baud rate, data bit, stop bit, and
parity settings in the multimeter’s Setup
mode. (Default values are 9600, 8, 1, and
none.)
❏ Verify that the driver for the IR-USB interface
is installed.
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