Diagnostics
WARNING LOW MA - PRESS ANY KEY
- The system generates this message when the actual mA being produced is lower
than the amount shown on the C-Arm Control Panel display, and is not within tolerance. Lower mA may result in poor image
quality. If message persists, check filament drive circuitry, and mA Sense circuitry.
X-RAY OVERTIME - PRESS ANY KEY
- The system produces this message when a film shot continues beyond the required
exposure time, and software terminates the exposure. Press any C-Arm Control Panel key to continue. This message is a safety
precaution to prevent excessive patient X-ray exposure.
X-RAYS DISABLED
X-RAY SWITCH SECURITY ERROR -
The system produces this message when there is a mismatch between the Security line
on the footswitch or handswitch, and the Security line on the matching connector. If problem persists, check footswitch and
handswitch for incorrect wiring, and check the X-Ray Controller PCB.
X-RAY SWITCH STUCK
- The system generates this message when it senses an X-ray control in the ON state during system
startup. This error applies only to the Left or Right X-ray controls, and causes the system to shut down. Verify that the switch is
not being held down. Disconnect handswitch and/or footswitch and restart the system. If the system restarts without failure, the
disconnected device may require service. If message persists with handswitch and/or footswitch disconnected, there is an
internal fault that is preventing proper system operation.
X-RAY TUBE TEMPERATURE SENSOR FAILURE - PRESS ANY KEY
- This message appears when the X-ray tube’s
temperature sensing thermistor fails functional testing at start-up. You may continue using the system, but there is a danger that
the X-ray tube may overheat during use without further warnings being given. Overheating may cause X-ray tube or cooling
bladder damage, which may result in patient burns. The message remains on the C-Arm Control Panel displays, and the
generator is disabled until you press any C-Arm Control Panel key.
A/D Channel Failure
If an analog-to-digital channel failure occurs, the message AD CHANNEL # FAIL appears on the C-Arm Control Panel displays.
The analog-to-digital converter is located on the X-Ray Controller PCB. It consists of op amps, a 16-channel mux (U48), a unity-
gain op amp, and a 12-bit A/D converter that has an input range of about 10 Volts. U36 provides a 2.5 Volt reference for the A/D
converter. Buffer U27 reads the data from the A/D converter.
All A/D channels and their associated signals can be probed on the X-Ray Controller PCB.
13
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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