What is Philips CT error code N04?

Gantry rotate motor servo not ready. It is reported by the Gantry Rotation Control (Stator Control Board) on Access Series CT (6/16/Dual) CT systems. Severity: Warning — recoverable condition; subsystem: Gantry Rotation Control.

What should a field engineer do about N04?

Cross-reference System Error Code 0x5501. Follow the Gantry Rotation Prepare Error flow chart (Section 2.4.5); check the rotor motor servo drive power/enable status before scanning.. Isolate the Gantry Rotation Control subsystem and follow the status-code troubleshooting in the service manual. FSELIB documents the full diagnosis and remedy for the Access Series CT (6/16/Dual).

Warning — recoverable conditionGantry Rotation Control

N04 — Gantry rotate motor servo not ready

Philips CT error code, reported by the Gantry Rotation Control (Stator Control Board).

What N04 means

On Access Series CT (6/16/Dual) CT systems, status code N04 indicates: Gantry rotate motor servo not ready. The code originates in the Gantry Rotation Control section of the Gantry Rotation Control (Stator Control Board). Severity level warning (Warning — recoverable condition).

Reported action: Cross-reference System Error Code 0x5501. Follow the Gantry Rotation Prepare Error flow chart (Section 2.4.5); check the rotor motor servo drive power/enable status before scanning..

Listed in Table 1-3 'Stator Control Board Error Code vs System Error Code' of the Philips Access CT Service Trouble Shooting Guide (459800863401 Rev. C), for the Access Series CT (6/16/Dual) family, in the 'nxx' warning-code range. Not confirmed for other Philips CT systems.

Full troubleshooting for N04

The complete diagnosis, cause tree, and step-by-step remedy for the Gantry Rotation Control subsystem are documented in the FSELIB Activion16 (TSX-031A) service manual — re-authored, web-first, with real figures.

Open the Activion16 service manual

Related Gantry Rotation Control codes

ER09Gantry rotor motor servo warning ER0ARotation pulse sampling abnormal ER0BContinuous gantry rotation time-out ER0CGantry stop-rotation time-out ER0DTorque voltage measurement/output tolerance exceeded ER38Rotor motor overspeed N05Gantry rotate motor servo operating in torque mode N06Gantry rotate zero position not found

Discuss N04 with other field engineers in the FSELIB forum

Source: Philips Access CT Service Trouble Shooting Guide — 459800863401 Rev. C. Reference information re-authored by FSELIB — not a copy of the OEM manual.