4 Service and Maintenance
56 Keysight U1241B and U1242B User’s and Service Guide
When servicing, use the specified replacement parts only. The Table 4-2 shows
the replacement part numbers.
Table 4-1 Basic troubleshooting hints
Malfunction Identification
No LCD display after power ON
– Check the battery polarity and replace batteries if necessary.
Ensure that the replaced batteries are new batteries, it is
recommended not to mix old batteries with new batteries.
No beeper tone
– Check setup mode and verify if the beeper is set to OFF.
Then select the desired driving frequency.
Failed on current measurement – Check the fuse.
Table 4-2 List of replacement part numbers
Part number Description
2110-1400 Fast blow fuse 1000 V, 0.44 A (10 mm x 35 mm)
2110-1402 Fast blow fuse 1000 V, 11 A (10 mm x 35 mm)
U1241-46400 Battery cover (without screw)
5190-2573 Battery cover screw
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