74 Service manual
4. Troubleshooting CRANEX
®
Novus e
If the "actual" values differ by more than ±2kV from the
target values, it indicates that there is a problem and
the tubehead must be recalibrated.
From the Service Assistant select calib and calibrate
the tubehead.
NOTE:
Keep exposure switch pressed for the duration of the
calibration program.
After recalibrating the tubehead check if the calibration
was successful.
If the calibration is successful select the exp function
again and confi rm that the mA and kV feedback signals
are correct.
If the calibration was unsuccessful and the unit still
does not work correctly, check the hardware.
Hardware check
Remove the cables from the tubehead side of the rotat-
ing unit. Check the cables between the Tubehead and
the L1800 Generator board. Replace them if they are
faulty and then recalibrate (calib) the tubehead.
If recalibration is not sucessful, measure the feedback
signals from the Generator board. From the Service As-
sistant select exp.
Connect a DMM to the TP14 (kVfb) and TP17 (GND) on
the Generator board and take an expose.
Then connect the DMM to TP18 (mAfb) and TP17
(GND) and take another exposure.
The values for feedback signals can be counted as de-
scribed in chapter 3.6 L1800, Generator Board - Test
points
If values for the feedback signals are not within the lim-
its, and recalibration does not help, measure the refer-
ence signals from L1800 Generator board.
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