IBM System Storage TS3310 Setup And Operator Manual page 198

Troubleshooting Steps:
1. If any of the I/Ostation doors are partially open, close them.
2. If none of the doors is partially open, open the access door and look for the unplugged cable on the back of the
lock assembly.
3. Contact IBM Technical Support if problem persists.
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TS3310 Tape Library Setup and Operator Guide