Troubleshooting the CASE IV System (Contents)

(Text from Troubleshooting Guide, version 1.1, item no. N12.p65, rev. 9/3/97)

Go to: Troubleshooting Main (Contents) Part 2 Part 3 Part 4

	Introduction
	General Guidelines
	Who Answers Which Questions? The "Help Desk" Classification of Questions
	Main Unit (Microprocessor Control Unit) Appears to be damaged Green power LED (light) is not on Fan is not spinning "High/Low Limits Exceeded" LED is on "Interlock Engagement Prevented" light remains lit "Interlock Disabled" light remains lit
	Host Computer Computer won't "boot" Computer stops responding CASE IV software does not operate correctly Other software does not operate correctly
	Thermal Stimulator Out of calibration Operation seems too hot or cold Patient reports that the Thermal Stimulator feels cool all the time, or hot all the time Thermal calibration verification doesn't work Thermal calibration verification works at 30 degrees C., but not at 20 or 40 degrees
	Vibration Stimulator Out of calibration Appears not to vibrate Laser beam is not working Laser beam is fuzzy Laser beam is dim Won't stay up
	Other Hardware Patient Cue Device: Is not operating correctly Patient Response Device: Is not operating correctly Printer: Is not operating correctly Printer: Graphs are not printing out Monitor: Doesn't turn on or picture is defective A part of the CASE IV System doesn't work
	On-screen Error Messages "ABT failure" "Communication error with controller" "Prom version is -1…" "Error LPT1… abort, retry, fail?" "Hardware limit failure" "Too many nulls …" Any other error message
	Testing Procedure/General The system appears to "hang" during the time stimuli are given in a CDT, WDT, or VDT test Vibration test results are not what were expected Thermal test results are not what were expected The percentile seems wrong for this patient Possible injury to a patient

Introduction

If you have a problem with your system, you may be able to resolve it quickly and easily by following the appropriate procedure described herein. It provides procedures for troubleshooting the most common problems you may encounter with the system.

You may find it helpful to have the Hardware User’s Guide, Software User’s Guide, and Scientific Reference available at hand to perform some of the procedures.

General Guidelines

1. Determine whether similar problems occurred previously. If you are a site administrator, determine whether this or a similar problem occurred previously with the individual site.
2. Determine if anything done by the technician or patient could have caused, or helped to cause, the incident. Also, note the condition of the equipment and the test environment, such as whether the testing room is unusually hot or cold, or whether there appears to be damage to any component.
3. Gather as many facts as possible that may pertain to the problem. If you don’t know whether the information is relevant, record it anyway. Record all information, including procedures followed and conclusions drawn.
4. Don’t panic.
5. Be methodical in your approach.
6. If an injury has occurred, contact the manufacturer and the test administrator. You may need to file an MDR with the FDA.

	WARNING: If you must check something inside the Main Unit, proceed with caution. Voltage inside the unit may cause electrocution.
	WARNING: If you bypass or disable any of the safety interlock features in the CASE IV during troubleshooting, DO NOT test any patients. An injury may occur. Never test patients with the interlocks disabled.