Planmeca Proline EC ceph, Technical Manual

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Chapter C - HELP & ERROR MESSAGES
Planmeca Proline EC X-ray unit C-9
ERROR MESSAGE EXPLANATIONS
Technical Manual
3.6 Errors 50-57 (connector or cable errors)
Er 50 Temperature sensor shorted
Before each exposure and after pressing READY or kV, mA adjustments the temperature of
the tubehead is measured. If the result is too low it is assumed that the sensor is short
circuiting.
Sensor broken. Measure the resistance that should be 1000 ohms at 25 °C. If not near,
replace.
If disconnecting the cable to cassette end limit sensor board cures this error, then this cable
and/or sensor board is partially shorting the + 15V.
Check in service mode the measured temperature. If still low with cables disconnected, faulty
generator processor board.
Er 51 Temperature sensor open (overpressure when applicable)
Before each exposure and after pressing READY or kV, mA adjustments the temperature of
the tubehead is measured. If the result is too high it is assumed that the sensor is open circuit.
In some models there is an overpressure sensor in the tubehead, connected in series with the
temperature sensor and breaking the circuit at overpressure. Also, if the tubehead and gener-
ator processor grounds are not properly connected to the protective earth this error will be
indicated.
Check the earthing cables.
If seems ok by resistance measurement (about 1000 ohms at 25°C) then the generator proc-
essor board is faulty.
Er 52 mA or kV feedback cable open
Before each exposure and after pressing READY the kV and mA feedback signals are meas-
ured. If the result is too high it is assumed that the cables are not properly connected.
If seems ok by resistance measurement (kV about 16 k
Ω
, mA about 383R), measured at the
generator processor board inputs while cables connected, the board is faulty.
Er 57 Exposure button activated
If the exposure circuit is activated when the unit is turned on or service mode is entered, Er 57
occurs. This is to prevent unintentional exposures.
3.7 Errors 60-61 (generator processor and AEC related errors)
Er 60 Supply voltage ± 15 too low
Generator processor board analog circuits have operating voltages of ±15V.
If these are below about 12.5V this error is indicated.
If disconnecting the cable to cassette end limit sensor board cures this error, then this cable
and/or sensor board is shorting the + 15 V.
Otherwise faulty generator processor board.