Troubleshooting the CASE IV System
Part 2

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

Main Unit (Microprocessor Control Unit)

Main Unit: Appears to be damaged

Possible Cause 1: Main Unit was damaged in transport.

What to do: Determine what shipping company transported the goods. Contact the party responsible for the freight charges to evaluate the feasibility of filing a damage claim with the shipper. Contact the help desk to arrange for repairs.

Possible Cause 2: Main Unit was damaged by personnel at the user's site.

What to do: Query staff about possible causes and consider keeping the system in a locked room. Contact the help desk to arrange for repairs.

Main Unit: Green power LED (light) is not on

Possible Cause 1: System is not set up correctly.

What to do: Check that the components of the CASE IV System are connected together correctly, and make sure the power cord is plugged in completely in the back of the Microprocessor Control Unit. Refer to chapter 4 of the CASE IV System Hardware User's Guide for set-up instructions.

Possible Cause 2: Power strip and isolation transformer are not plugged in properly.

What to do: Confirm that the power strip is plugged into the isolation transformer and that the isolation transformer is plugged into the wall socket. Is the wall socket working? Plug a device that you know works, such as a lamp, into the wall socket and confirm that power is available.

WARNING: Do not attempt to repair a non-working wall socket. Contact a qualified electrician to make repairs.

Possible Cause 3: Isolation transformer fuse may be blown.

What to do: If you confirmed that power is available in the wall socket and the isolation transformer is plugged in yet still the LED is not lit, check the fuse in the isolation transformer. The fuse may be blown. This is common when laser printers are attached to the isolation transformer, due to their high current draw. Contact the party responsible for the isolation transformer. Replace the fuse in the isolation transformer. Refer to the isolation transformer's manual for instructions.

WARNING: Do not make repairs to this device with it connected to the wall socket. Serious injuries may occur.

Possible Cause 4: Main Unit fuses have failed.

What to do: Unplug the Main Unit and remove the cover on the power entry module (on rear panel). Replace the fuse with a 5-amp, 250-volt fuse. Do not use a higher value. Replace the fuse holder in the power entry module, taking care to orient the arrow to the correct voltage. Plug the Main Unit in, turn it on, and recheck it to see if the green power light on the front panel is lit.

Main Unit: Fan is not spinning

Possible Cause 1: Unit is not switched on.

What to do: Check that the switch in the back of the Main Unit is switched on. Confirm that the green power LED (light) on the front panel is on.

Possible Cause 2: Unknown (green power LED - light - is on, but the fan is still not spinning)

What to do: If the power LED is on and yet the fan is not spinning, do not continue to operate the unit. Serious damage to the internal components may result. Contact the help desk for repair instructions.

Main Unit: "High/Low Limits Exceeded" LED is on

Possible Cause: During operation, the system detected the Thermal Stimulator running too high or low.

What to do: Immediately remove the Thermal Stimulator from the patient. This interlock is designed for patient safety and is designed to protect the patient from excessive temperatures that may cause harm. If the system will not operate properly, see the "Thermal Stimulator: Out of calibration" section.

Note: If the Thermal Reservoir has been running for an extended period, and if many cooling tests in a row have been done, the water temperature may have become too high. The water may have to be replaced by cooler water.

Main Unit: "Interlock Engagement Prevented" light remains lit

Possible Cause: The on-board computer in the Main Unit has detected a condition that will prevent use.

What do to: See the "Thermal Stimulator: Out of calibration" section. If unable to engage the system, contact your help desk for repair instructions.

Main Unit: "Interlock Disabled" light remains lit

Possible Cause: The blue plug has been forcibly installed upside down.

What to do: Check the plug, and make sure that the copper plug is in the copper hole, and the silver plug is in the silver hole.

HOST COMPUTER

Host Computer: Computer won't "boot"

Possible Cause 1: A non-"bootable" floppy disk is in the disk drive (you will see the message "non-system disk or disk error; replace and strike any key when ready").

What to do: Look in the floppy disk drive of the computer for a disk. Push the eject button. Press any key on the keyboard to continue.

Possible Cause 2: There is a malfunction of the Host Computer.

What to do: Contact the party responsible for your Host Computer maintenance.

Host Computer: Computer stops responding

Possible Cause: A memory error may have occurred.

What to do: Check if the computer responds to any keyboard inputs. Try holding down the CTRL and the C keys at the same time to break the current process. Check that the disk light on the Host Computer is not flickering, which would mean the computer is accessing information on the hard drive and may not be available to respond to keyboard commands. If unable to make the computer respond, restart the system by shutting the power off. Use the power strip if available to power cycle (turn on and off) the complete system.

Host Computer: CASE IV software does not operate correctly

Possible Cause: Configuration was changed.

What to do: If the Host Computer was furnished by WR Medical Electronics Co., it was sent preconfigured and ready to run. Therefore, it was known to be operating correctly when it left the factory. Most likely, a change to the configuration of the Host Computer was made by someone since the last time the computer was used. Query the site staff, and then contact the party responsible for the computer maintenance, or call your help desk.

Host Computer: Other software does not operate correctly

Possible Cause: Beyond the scope of this guide.

What to do: (Note: WR Medical is responsible for only the CASE IV System software operating on the Host Computers provided by the factory.) If the software is made by another manufacturer, or if WR Medical did not provide the Host Computer, contact the party responsible for the computer maintenance.