Error conditionGantry / rotation

4420 — Communication error between GMS and SCST(PTST). : View number on GMS and C-CONT is different.

Canon Medical (Toshiba) CT error code, reported by the console error system (EMS).

What 4420 means

On Aquilion 16 and Aquilion RX and Aquilion ONE and Aquilion S16 and Asteion Super4 and Activion16 CT systems, status code 4420 indicates: Communication error between GMS and SCST(PTST). : View number on GMS and C-CONT is different.. The code originates in the Gantry / rotation section of the console error system (EMS). Severity level error (Error condition).

Reported action: Gantry error detected. Turn gantry off for 5 seconds and try again. If problem persists call service..

Reported by the Toshiba/Canon CT console error system (errmsg.eng / EMS error message table), shared across the Aquilion, Asteion and Activion CT platforms.

Full troubleshooting for 4420

The complete diagnosis, cause tree, and step-by-step remedy for the Gantry / rotation subsystem are documented in the FSELIB Canon Medical (Toshiba) service manual — re-authored, web-first, with real figures.

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Related Gantry / rotation codes

90000010Gantry is tilted — tilt angle not at zeroB1300000Error in Wedge movementB1320000Error in Slit movementB1330000Error in BeamTrimmer movementB1350000Error in Gantry TiltB1360000Error in Gantry RotationB1361000Error in Gantry RotationB13F0000Gantry is not powered ON

Related service procedures

Run the console malfunction-diagnosis program (hwtest)Console (Diagnostics)Run the independent MHR PWB test (diagnostics) from the RTM terminalConsole (Diagnostics)Remove the host PC unit (PX74-07959 GR-1/GR-2)Console (Operation)Remove the host PC unit (PX74-08766 GR-1/GR-2)Console (Operation)Remove and install an RDD disk/power-supply unit (Rorke Data)Console (Recon)Remove and install an RDD fan unit (Rorke Data)Console (Recon)
Discuss 4420 with other field engineers in the FSELIB forum

Source: errmsg.eng — Toshiba/Canon CT console (EMS) error message table. Reference information re-authored by FSELIB — not a copy of the OEM manual.