User manual

2 Service and Maintenance
Troubleshooting
34 U1271A/U1272A 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.
WARNING
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
❏ Verify the fuses health and replace the fuses
as necessary.
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, and parity
settings in the multimeter’s Setup mode.
(Default values are 9600, 8, and none.)
❏ Verify that the driver for the IR-USB interface
is installed.