Quantum Instruments DLT 7000 - Manual (Page 56)

Hardware Implementation
2-18 Quantum DLT 7000 Tape Drive
Table 2–6 LED Functionality (continued)
LED LED Color Description
Use Cleaning Tape Amber On = Tape drive needs cleaning or tape is bad.
Remains on after cleaning tape unloads = Cleaning tape
attempted to clean the drive head, but the tape expired so
cleaning was not done.
After cleaning, LED lights again when (data) tape cartridge is
reloaded = Problem tape cartridge. Try another cartridge. If
problem persists, contact service representative.
Off = Cleaning is complete or cleaning is unnecessary.
Appendix D has more information on cleaning tape usage.