DEC MicroVAX 3100 Owner's Manual page 51

Nonrecoverable Errors During Tape Motion
If the tape does not rewind when you push the unload button and the LEDs
continue to blink, the error is not recoverable. Call your authorized service
representative.
Errors During Cartridge Insertion
When the tape cartridge is damaged, or if internal portions of the drive that
handle the cartridge are not working, a cartridge fault occurs. If the green
LED blinks and the tape does not move (the yellow LED does not blink), a
cartridge fault has been detected. Remove the cartridge and try another.
Cartridge Incompatibility
If you cannot read or write on a tape cartridge, you may be using a
cartridge that is incompatible with the TZ30. The green LED may also
blink indicating that the TZ30 detected a cartridge error.
Testing
If you obtained diagnostics from DIGITAL or your authorized DIGITAL
representative, follow the instructions you received with your diagnostic
tape or diskette to detect any problems with the TZ30 or other device on
your system.
Inspection
If you have trouble loading a tape cartridge, it is a good idea to perform a
brief inspection of the tape cartridge leader.
Inspecting the Cartridge
Figure 3-5 shows the correct position of the tape leader inside the cartridge.
Before you attempt to use the tape cartridge, be sure the tape leader is in
the same position as the one in Figure 3-5. Lift the catch with your thumb
and open the small door to expose the leader.
CAUTION: Do not touch exposed portions of magnetic tape. If the tape
leader is not in the correct position, do not attempt to fix it. Use a new
cartridge instead.
3-10 MicroVAX 3100 and VAXserver 3100 Owner's Manual