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 Philips service manual — re-authored, web-first, with real figures.

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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

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