ProcedureGantrySetup & CalibrationAdjust

Adjust the gantry rotation belt tension

Check and, if needed, correct the tension of the rotation-drive timing belt so the gantry rotation section turns smoothly and the rotation servo doesn't fight an over- or under-tensioned belt. Do this whenever belt tension is suspect — for example, as a documented fix for uneven rotation or abnormal noise from the rotation drive (see Related) — or as part of scheduled mechanical checks.

Applies to
Activion16 (TSX-031A). No model- or revision-specific restriction is stated in source for this section.
Personnel
1 technician · Field service engineer (CT gantry mechanical service — belt-tension measuring instruments, KGTSM console operation)
Steps
16 steps
Source
2D201-112EN*D §1.5.2 (pp.86–89) — Rotation adjustment (1.5.2.1 Rotation speed adjustment; 1.5.2.2 Rotation belt tension adjustment, incl. the sonic-gauge and push-pull-gauge work flows)

Tools & parts

ItemPart numberQty
Sonic belt tension gaugeSTM303 (Unitta Co., Ltd.)1
Push-pull gaugen/a in source1
Standard toolsn/a in source1 set
Belt-tension adjustment bracketn/a in source1
Rotation-drive motor securing boltsn/a in sourcen/a
Tension adjusting boltn/a in source1
CP320circuit protector — rotation servo amplifier power1

Safety

DANGER

Hazard: The gantry is commanded to rotate (10+ turns at 1.5 s/rotation via the KGTSM) while the rear covers and front cover remain removed/open for this task

Consequence: A person or object caught in the rotation section during a commanded rotation check with covers open

Avoidance: Keep hands, tools, and bystanders clear of the rotation section for every rotation check in this procedure — treat the section as live and moving whenever CP320 is ON with covers open (safety library G-D05 pattern)

WARNING

Hazard: Inadvertent gantry rotation while the belt-tension adjustment bracket or motor bolts are loosened

Consequence: A worker caught in the rotation section, or damage to the partially loosened motor/bracket assembly

Avoidance: Keep CP320 OFF whenever you are not actively commanding a KGTSM rotation check (safety library G-W04 pattern)

CAUTION

Hazard: Rotating the gantry to verify belt tension while screws loosened earlier in the task (bracket screws, motor bolts) are not yet retightened

Consequence: Loose screws can fly off during rotation, causing personal injury

Avoidance: Before commanding any rotation check, confirm every screw loosened during this task is tightened firmly (source callout, both methods; == safety library G-CA12)

Full step-by-step for Adjust the gantry rotation belt tension

All 16 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 procedure

Related Gantry guides

Adjust the gantry positioning projectors (side, slant, and median)10 stepsAdjust the gantry rotation speed (servo amplifier, VR1)3 stepsAdjust the gantry servo-amplifier offset23 stepsAdjust the gantry tilt-stop angles (encoder calibration)5 stepsCheck the gantry rotation speed7 stepsCheck the gantry rotation speed voltage from the KGTSM PWB to the servo amplifier8 steps
View all Activion16 (TSX-031A) guides

Source: 2D201-112EN*D §1.5.2 (pp.86–89) — Rotation adjustment (1.5.2.1 Rotation speed adjustment; 1.5.2.2 Rotation belt tension adjustment, incl. the sonic-gauge and push-pull-gauge work flows). Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.