KaVo ORTHOPANTOMOGRAPH OP 3D Pro, Service Manual, Page: 177 / 192

7 Error codes and troubleshooting
169
7.6.8.2 Images too dark or too light (Wrong dose
generated)
• Check the condition of the power supply by follow-
ing trouble shooting guide 7.6.2.3 for no X-rays.
• Check that X-ray unit calibrations have been car-
ried out.
Preheat check
• Set the X-ray unit to the 3D imaging mode (and us-
ing the s2terminal type patient), adjust the mA set-
tings from the GUI and then measure the
respective voltages from TP11 (Preheat refer-
ence).
mA check
• Set the X-ray unit to the 3D imaging mode (and us-
ing the s2terminal type
patient
), adjust the mA set-
tings from the GUI and measure the respective
voltages from TP11 (mA reference).
 If the FAIL LED comes on
replace R3810. If the LED
still comes on after re-
placing R3810, replace
the tubehead.
If voltages differ from those listed below, replace
EG200.
8 mA

1.54V
10 mA

1.59V
12.5 mA

1.65V
15 mA

1.70V
If the voltages do not differ, set the mA to 15 mA
and measure voltage from TP15 (preheat feed-
back) when an exposure is taken.
 if voltage is not 0.58V then replace
R3810.
  If this does not solve the problem
still, replace the tubehead.