What is Philips CT error code ALE20?

Patient table servo drive serial connection time-out. It is reported by the Patient Table Servo Drive on Access Series CT (6/16/Dual) CT systems. Severity: Alarm — servo drive fault; subsystem: Patient Table / Patient Support.

What should a field engineer do about ALE20?

Check the serial communication cable/connector between the servo drive and the Patient Table Motion Control Board for an intermittent or slow link before replacing either unit.. Isolate the Patient Table / Patient Support 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).

Alarm — servo drive faultPatient Table / Patient Support

ALE20 — Patient table servo drive serial connection time-out

Philips CT error code, reported by the Patient Table Servo Drive.

What ALE20 means

On Access Series CT (6/16/Dual) CT systems, status code ALE20 indicates: Patient table servo drive serial connection time-out. The code originates in the Patient Table / Patient Support section of the Patient Table Servo Drive. Severity level alarm (Alarm — servo drive fault).

Reported action: Check the serial communication cable/connector between the servo drive and the Patient Table Motion Control Board for an intermittent or slow link before replacing either unit..

Listed in Table 1-12 'Patient Table Servo Error Codes' of the Philips Access CT Service Trouble Shooting Guide (459800863401 Rev. C), for the Access Series CT (6/16/Dual) family. Not confirmed for other Philips CT systems.

Full troubleshooting for ALE20

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

Open the Activion16 service manual

Related Patient Table / Patient Support codes

ER1APatient table CAN communication time-out ER28Couch position code measurement tolerance exceeded ER29Patient table error (grouped code)N09Patient table horizontal zero position not found N0BPatient table warning (grouped code)ALE01Patient table servo drive over-current ALE02Patient table servo drive over-voltage ALE03Patient table servo drive low-voltage

Discuss ALE20 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.