9 Troubleshooting LB 470 Level
56925BA2 Rev. 03, 11/2017
9 Troubleshooting
9.1 Error Search
Master unit: Screen black; LEDs
are not illuminated
EVU does not work
Check power supply and
fuses
Slave module:
LEDs are not illuminated
Slave module not clamped
properly
Check cabling, contact
sockets
No signal Detector does not work
Check the functioning of
the detector
Count rate too low
Shield not opened or not
opened correctly
Check lock and ensure it is
in OPEN position
Incorrect focus of the effec-
tive radiation on the
detector
Correct and optimise the
alignment
Objects in the beam path
Offset irradiation level
Source at the end of its usa-
ble life span
Replace source
No or incorrect level display level value entry incorrect
Check the calibration value
and the level display
The level display deviates
Defect in detector
Check detector
Incorrect calibration
Check calibration values
Count rate too low (see
above)
Check source age and irra-
diation level, replace
detector
Detector is not detected (soft-
ware)
Terminals / wiring
Check terminal connection;
check terminal assignment
Damaged line
Check cable; examine with
measurement device.
Incorrect type LB44xx /
LB54xx / LB4700 in the con-
figuration
Check type of detector (see
type plate on the detector)
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