Portable X-ray units are found in most radiological/diagnostic imaging departments. They are typically exposed to a higher abuse level due to elevator openings, tight room entrances, limited patient access, and lack of space for maneuverability. This constant abuse will cause premature mechanical failure if not properly identified and corrected early. The trained service professional will be taught the skills necessary for mechanical, electromechanical, and electronic maintenance of the Siemens Mobilett. Each sub-system of the mechanical unit and the generator is thoroughly analyzed.

Models Covered

This course will cover the following Mobilett models:

  • Mobilett XP Hybrid
  • Mobilett Plus
  • Mobilett Plus HP
  • Mobilett II

System maintenance and generator calibrations are included for the following models. Detector and digital system calibrations are not covered for the following models:

  • Mobilett XP Digital


To attend this course, the service professional must have a good understanding of the principles gained through attending Phase II, or four years equivalent experience. The service professional must also possess a good mechanical aptitude.

Note: Students may be required to bring a copy of manuals delivered with the unit as well as a service/work laptop.Please call for more details.


At the conclusion of this course participants will be able to:

  • Evaluate overall system performance
  • Troubleshoot mechanical and electronic problems on all components of the unit
  • Perform a complete and thorough preventive maintenance inspection on each portable unit
  • Follow circuit operations of system detail block diagrams

Course Outline

Day 1
  • Introduction
    • Basic operations
      • Knobology
      • Terminology
    • Specifications
  • Models & unit comparison
    • Mechanical
    • Electronic
    • Documentation
      • Mobilett system diagrams
      • Lab Activities
  • Basic operation
  • Circuit identification and location

Day 2
  • Charge Circuit
    • Batteries
  • Inverter Circuit
    • Tube stator
    • Filament control circuits
    • Collimator lamp circuits
  • Lab Activities
    • Charger calibration
    • Filament calibration
    • Battery maintenance
    • Battery change
Day 3
  • MUX-Power
    • Inverter driver circuits
    • Inverter circuits
  • Logic circuit
    • Safety circuits
    • Exposure start/stop circuits
  • Lab Activities
    • kV calibration
    • Timer calibration
    • Timer waveform analysis

Day 4
  • Drive circuits
    • Speed control
    • Braking system
  • Mobilett block diagram
    • Filament control circuits
    • kV control circuits
    • Charger control circuits
  • Lab Activities
    • Drive control circuits
    • Major component disassembly\
      • Tube replacement
      • Extension column
      • Vertical column
      • High voltage transformer

Day 5
  • System troubleshooting
    • Mechanical
    • Electronic
  • Overall system review
  • Final exam
  • Course evaluation