GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 1 Direction 18000
6-3-20
3-4 Disk System Adjustments (Continued)
e. Perform Steps 3b thru 3d for each head needing alignment.
f. Re-torque each head to 5 in/lbs.
g. Check the alignments again, since they may have moved in Step f, and realign if necessary.
h. Remove the Carriage Locking Pin (see Illustration 6-3-5).
4. Check for Drift
a. Command continuous seeks as follows:
UNIT:’CR’
DATA:’CR’
COMMAND
STRING: REC, SEE 1400, LOOP ’CR’
b. After 2 minutes of continuous seeks, type ‘CR’ to halt the seeks.
c. Recheck the alignment per Step 2 and realign if necessary per Step 3 of procedure F.
5. Tear Down
a. Bring down drive and remove the CE pack.
b. Disconnect the oscilloscope, and replace the covers.
NOTE: If any of the heads were realigned, all disk packs must be reformatted and software
reloaded prior to use. Refer to SM 9800B System Manual, Chapter 4, for the Load-from-
Cold (software load) procedure.
G. Velocity (Tach Cal) Adjustment
The Velocity adjustment should be made whenever the Servo/Clock board or the Tachometer is replaced.
The adjustment procedure is found in DG #11, Part 2, “Velocity Adjustment”.
The following procedure may be used to program continuous seeks as required for the velocity adjustment:
1. Load a scratch disk pack and bring up the drive to READY.
2. Mount and load the DTOS tape. If necessary, refer to DTOS Volume #1, Part 1, for more details.
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