Digital Equipment RW504-ZA, Руководство по обслуживанию

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3. Remove the disk library top cover.
a. Remove the four T-20 screws on the back cover.
b. Slide the top cover towards the back of the unit to free the four tabs from
the sides of the autochanger chassis, and then pull the sides of the top
cover out slightly while lifting the cover off.
4. Remove the right side panel. (This will allow you to observe the LEDs on the
front of the optical drive mechanism.)
a. Remove the four T-15 screws at the back end of the side panel.
b. Slide the panel towards the back of the autochanger until the panel can
be lifted off.
5. Switch on both the rear panel power switch and the front panel operation
switch, and wait for the power-on self-test to complete.
If the power-on self-test completes successfully, both LEDs will turn off. If
power-on self-test fails, the fault LED will remain lit.
4.3 Optical Disk Cleaning
Note
Cleaning an optical disk is needed more commonly on standalone drives
than with autochangers because of the differences in their environments
and usage. While the following information is therefore more applicable
to standalone drives, an autochanger may be used in such a way as to
make the following cleaning information apply. Disk cleaning for libraries
in general, however, is NOT RECOMMENDED as a normal user task.
Disk cleaning should only be done after a read/write failure or if a customer
notices a loss of autochanger performance. In addition, it must be determined
that the failure or loss of performance was not caused by a definite hardware
failure.
A failure to read a disk may result from:
• Hardware failure
• Contamination of the disk surface
Troubleshooting and Diagnostics 4–7