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## Verify Main Module Motherboard Functionality

1. Verify that the OK LED is lit on the main module and that the Fault LED is not lit.

   See Main Module Motherboard LEDs.

2. Verify that the front and rear Service Required LEDs are not lit.

   See Interpreting Diagnostic LEDs.

3. Perform one of the following tasks based on your verification results:

   - If the previous steps did not clear the fault, see Diagnostics Process.

   - If the previous steps indicate that no faults have been detected, then the main module motherboard has been replaced successfully. No further action is required.

##### Related Information

- Main Module Motherboard Overview

- Main Module Motherboard LEDs

- Locate a Faulty Main Module Motherboard

- Remove the Main Module Motherboard

- Install the Main Module Motherboard

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