KaVo ORTHOPANTOMOGRAPH OP 3D Pro, Service Manual, Page: 180 / 192

7 Error codes and troubleshooting
172
Actuator malfunction can be caused either by a faulty
motor or faulty driving electronics. Use the s2terminal, the
drivemotor
command, with suitable parameters, to check
the status of the motors. If there is no motion the faulty
component can be easily found by replacing them one by
one, the motor, the driving electronics and then the cabling
until the faulty component is identified.
Sensor malfunctions can be solved in same way as
actuator malfunctions. Selecting service mode and then
using the
systemstatus
command will show the status of
most sensors (optosensor and micro switches). Trouble
shoot by manually moving the unit and following the status
changes for the sensor you wish to check. Alternatively
start the
drivemotor
command in manual mode for
example
drivemotor X man
will drive the X motor back
and forth (when chin support up/down keys are pressed). If
the status does not change when an opto or mechanical
switch is activated, then changing the sensor or its related
cabling should fix the problem.
If related cables and switches are found to be working, the
problem is probably caused by a faulty logic board (R3220,
R3300 and/or R3400). The related block diagrams give an
overview of what components comprise a particular
motion.
Note! Some of sensor signals travel through the serial in-
terface (J3213

JG205). If such a signal is shown incor-
rectly, the fault may be in either the cabling, the sensor, or
the serial interface board (EG200).
7.6.10 Z-Motion control
7.6.10.1 Main support up/down (Z) movement does
not work
• Check that the LEDs UP/DOWN and ENA on
R4300 come on when the Z up/down buttons are
pressed. If not, check that both direction and ena-
ble signals from the buttons are reaching the
R3400 board by using service command
system-
status
. Check the connection of the buttons and
replace if needed.
• Check that the voltage selector on EA200 is set to
the mains voltage being used.
• Check fuse 1 on R3400.
Replace if blown.