TM11-7025-229-12
(3)
Verify that after approximately 30 seconds, the RDY light illuminates.
(4)
Set the UNIT SELECT switch to the correct position. Refer to applicable system manual.
NOTE
If the UNIT SELECT switch is not set to the correct position, the PASS and SEL
indicators will flash.
(5)
When the host computer is loaded and ready to conduct a system test of the disk unit, momentarily
position the SUB SYS TEST toggle switch up.
(6)
Verify that after about 15 seconds, the PASS indicator starts blinking. If the FAIL indicator lights, rerun
the test. If the problem persists, refer to chapter 3 for maintenance instructions.
(7)
For more detailed operating instructions of the disk unit in the specific operating system, refer to the
applicable system manual.
d. Turn Off Procedures. Refer to applicable system manual. Position the PWR ON/PWR OFF toggle switch
to PWR OFF.
2-7.
HDA CHANGE-OVER
Periodically, it will be necessary to exchange Head Disk Assemblies because of system operational requirements. Also,
it is absolutely essential that the HDA be removed from the disk unit prior to installing, removing, or moving the disk unit.
The text to follow provides an illustrated step-by-step procedure for removing and installing the HDA. See illustration on
next page.
WARNING
DO NOT remove the HDA or cabling with the units power on. Position PWR ON/PWR
OFF switch to PWR OFF first.
CAUTION
Great care must be exercised by the Operator when handling the HDA. Avoid subjecting
the HDA to bumping, rough handling, or dropping. Shocks due to improper handling can
cause the heads to score the disk surfaces or crack the heads; a drop of one-half inch
onto a hard surface may cause a head crash.
2-9
