You can use the troubleshooting tables to find solutions to problems that have identifiable symptoms. The tables contain a list of symptoms and the suggested action to take to solve the problem. There is a table for each HMC component. For information about these tables, refer to the Service Guide for Deskside and Rack-mounted Consoles manual.

Note: The troubleshooting tables may refer to a parts listing. Make sure you are using the parts listing for the specific HMC you are servicing -- 7042-CR4 or 7042-C06.

If you cannot find the problem using these tables, you should run the diagnostic programs used to test the components of the HMC. Refer to the Service Guide for Deskside and Rack-mounted Consoles manual for information about running the diagnostic programs.

Note: If you have just added new software or a new optional device and the HMC is not working, complete the following steps before using the troubleshooting table:

1. For the 7042-CR4 HMC, check the system-error LED on the operator information panel. If it is lit, check the light path diagnostics LEDs. For the 7042-C06 HMC, check the LEDs on the front panel or the system board.
2. Remove the software or device that you just added.
3. Run the diagnostic tests to determine whether the HMC is running correctly.
4. Reinstall the new software or new device.