Wedge section troubleshooting — filter won't operate, abnormal noise, or unstable wedge block
Start here when the wedge (bowtie) filter carriage won't move, or the wedge drive is noisy/unstable. This page isolates the fault by what you observe first — does the motor turn or not, and where is the noise or instability coming from — then routes you straight to the probable cause and the fix.
Safety
Hazard: Wedge carriage, rack-and-pinion, and torque-transmission parts move inside the rotating gantry frame
Consequence: Pinch / entanglement injury while inspecting or freeing a jam with the system powered
Avoidance: De-energize the wedge motor circuit (or power down the gantry) before reaching into the torque-transmission system or handling the pinion/rack
Hazard: Wedge motor and wiring under power during cable/connector checks
Consequence: Electric shock or short while checking the power cable or reconnecting a loose connector
Avoidance: Power down before disconnecting, inspecting, or reconnecting the wedge motor cable or connectors; power up only after the cable is firmly seated
Hazard: Wedge position depends on the origin (photosensor) reference
Consequence: Cumulative positioning errors or a wedge that will not track the preset position correctly if origin return is skipped or the sensor is faulted
Avoidance: After any repair (sensor, motor, pinion, or fixing-bolt work), let the wedge complete a normal origin-return cycle before returning the system to clinical use
Full step-by-step for Wedge section troubleshooting — filter won't operate, abnormal noise, or unstable wedge block
All 0 steps are documented in the FSELIB Activion16 (TSX-031A) service manual — re-authored, web-first, with the real figures from the source.
Open the full procedureRelated Gantry guides
Source: 2D201-112EN*D §1.2.4 Troubleshooting and repair of the wedge section (p.42). Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.