GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 1 Direction 18000
6-3-16
3-4 Disk System Adjustments (Continued)
d. Read each head, as follows, comparing the waveform on CH #2 of the scope to Illustration 6-3-4
for each head.
UNIT: ’CR’
DATA: ’CR’
COMMAND
STRING: REA X 22 ’CR’
(Where X identifies the head to be read, 0 thru 22
8
)
Record those heads needing alignment. (Disregard the error print out on the terminal).
e. If no heads need realignment, bring down the drive, remove the CE pack and scope, and you’re
done. If some heads do need to be aligned, continue on to Step 3.
3. Alignment
a. Insert the carriage locking pin as shown in Illustration 6-3-5.
NOTE: The locking pin must drop into the hole in the carriage without contacting the
safety arm. If the safety arm is out of alignment, loosen its two retaining screws
and realign the arm over the hole and then retighten the screws.
WARNING: THE LOCKING PIN PROTECTS YOU FROM BEING INJURED IF SOMETHING
CAUSES AN EMERGENCY RETRACT WHILE YOU ARE WORKING AROUND
THE HEAD POSITIONER. BE SURE TO USE IT.
Caution: However, the locking pin effectively disables the drive from protecting itself
from a head crash in the event of power loss or spindle rundown. If you see the
drive try to retract against the locking pin, quickly remove your alignment tools,
pull the locking pin out and manually pull the carriage back (retracting the
heads). Do not leave the drive unattended while the locking pin is in place. Do
not issue a command that will cause the heads to attempt to move while the
locking pin is installed.
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