Planmeca Intra Technical Manual page 31

E.13 Filament preheating voltage calibration failed
During preheat calibration the filament voltage is measured to be in specified limits. The
filament circuit in the tube head or in the tube head PCB is faulty or the tube head is faulty.
Perform the calibration procedure again. If it fails, replace the tube head or tube head PCB
(in this order). The possible reason is also faulty feedback cable in the tube head.
E.29 Control panel key short-circuited/pressed during the self test
This error can occur only during the self-test. During the self test the unit checks that all
keys are open (normal state if not pressed). If a key is found to be in short circuit, this error
is displayed. Because the control panel keys are arranged in a matrix, one key's short
could cause the whole keyboard to operate erroneously, therefore this check is important.
Replace the control panel.
The factory predetermined settings are recalled and the density value is set to zero by
pressing any of the keys during the self test. The error code E.29 appears on the time
display, after which the right-hand preprogrammed setting key must be pressed and held
down for 6 seconds. See section 3 "RECALLING THE FACTORY PREPROGRAMMED
EXPOSURE VALUES" on page 20.
E.30 kV value does not reach or it exceeds the given value (difference more
than 5%)
The tube voltage is sampled periodically (by the tube head CPU) and if the actual
measured kV-value differs more than ± 3 kV from the specified value this error is
displayed. The tube head, tube head PCB, generator PCB or arm/extension cable signals
HV1, HV2 or KVC (see wiring diagram) can be faulty. See also error E.11 and E.34.
Check the incoming mains voltage during the exposure. Check the arm/extension cable
and the tube head feedback cable. Replace the generator PCB, tube head PCB or tube
head (replace in this order).
E.31 X-ray tube anode current (mA) missing, or not in specified limits
The tube current is sampled periodically (by the tube head CPU) and if the actual
measured mA-value differs more that ± 2 mA from the specified value this error is
displayed. The tube head, tube head PCB or tube head feedback cable can be faulty.
Proceed with the filament definition, see paragraph 2.3 "X-ray tube filament preheating
voltage calibration" on page 13 for details. If this does not help and the error occurs
constantly check the tube head feedback cable, replace the tube head PCB, or tube head
(in this order).
E.33 X-ray tube filament voltage (V) missing, or outside the range (too low
or too high)
The tube filament voltage is sampled periodically (by the tube head CPU) and if the actual
measured filament voltage is not in the specified limits (1.0 - 4.5 V) then this error is
displayed. The filament circuit in the tube head or on the tube head PCB can be faulty.
Check the tube head feedback cable. Replace the tube head PCB or the tube head (in this
order).
Technical Manual
ERROR MESSAGES
Planmeca Intra X-ray unit 27