Solving High Humidity Problems; Removing A Jammed Cassette From A Dds-Format Drive - HP 3000 Series Handbook

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Solving High Humidity Problems
If a sensor in the DDS drive detects that the humidity has risen above a safe operating level,
the drive stops whatever it is doing, unthreads the tape, and waits for the humidity to drop.
The DDS drive will not respond to any commands until the sensor detects an acceptable level
of humidity. This protects the drive and the tape media from damage.
Once the humidity has dropped to an acceptable level, the DDS drive must be power cycled
before it can be used again.
Note
A high humidity fault indicates that the customer needs to exercise tighter
control on the operating environment. Subjecting the DDS drive (and the
other computer equipment as well) to environmental extremes may shorten the
life of the drive. The operating environment should be maintained within the
range recommended in the system specifications.
Removing a Jammed Cassette From a DDS-Format Drive
If a DDS cassette becomes jammed in the DDS drive, try either power-cycling the drive or a
hard reset. If this fails to release the cassette, the cassette can be manually extracted from the
drive as follows (see Figure 5-4):
1. Rewind the tape to the Beginning of Media (BOM).
2. Switch off power to the DDS drive and remove the DDS drive from the cabinet.
3. Remove the cabinet mounting bracket from the drive.
4. Remove the two adapter brackets from the drive.
5. Insert a flat-blade screwdriver between the drive chassis and the side of the top cover. Pry
up the top cover at two points on each side of the top cover and remove the top cover.
6. Insert a size 00 flat-blade screwdriver through the emergency eject access hole (1).
7. View the tip of the screwdriver from the left-hand side of the drive, and angle the
screwdriver down into the slotted head of the worm gear
(2).
8. Rotate the screwdriver counter-clockwise and watch the worm gear to make sure it is
rotating. You must rotate the worm gear several hundred times because of its small
diameter.
Caution
'
• When the tape is unthreaded, a loop of tape will be hanging out of the
cassette. Be careful not to let any grease in the threading slots contaminate
the tape.
• As the cassette is ejected, the cassette door will close on the loop of tape
and may crease the tape. If the tape was at BOM before starting this
procedure, the crease will occur where no data is written. However, if the
tape was not at BOM, damage to the tape may occur and data may be lost.
Troubleshooting 5-63