QDR
4500 Technical Manual
7-2
those from the last PM for possible problems, and keep the printouts with the service
records for this system.
[ ] During a scan, verify that pressing the red emergency STOP switch, or turning the X-
RAY ENABLE key-switch to OFF,
immediately
stops all carriage motion and X-ray
production. X-ray production should be monitored by a Victoreen 450P or equivalent.
[ ] Test all tape switches. The tape switches are located along the length of the front and
back of the table, and mounted on the frame under the table. Verify that pressing a tape
switch
immediately
stops all carriage motion and X-ray production. X-ray production
should be monitored by a Victoreen 450P or equivalent.
Note:
The front (table) tape switch is disabled when the C-arm is at 0
°
, so this switch should be
checked with the C-arm at a position other than 0
°
.
[ ] Adjust the motor drive belts as follows:
Note:
Detailed instructions for all drive belt adjustments can be found in the
REMOVE AND
REPLACE
section of this manual.
1.
For each drive belt (C-Arm Y, Table Y, Table X, and C-Arm R), loosen the 2
mounting bolts holding the tension block.
2.
Tighten the tension nut so that the spring is compressed to 7/8
″
. For AY, TY and
TX tension springs, the bracket cutout can be used as a measuring guide (the
inside of the washer should be flush with the bracket cut). For the AR tension
spring, adjust to 7/8" from the inside of one washer to the inside of the other.
3.
Tighten the two mounting bolts holding each drive belt’s tension block.
4.
It is not necessary to perform the MOTOR calibration procedures after
tensioning the motor drive belts.
[ ] Ensure that all cable connections are tight.
[ ] Run SCANDISK to test the computer's hard disk. (SCANDISK is a DOS command on
DOS versions later than 5.0)
[ ] If necessary, run DEFRAG to unfragment and condense the files on the computer's hard
disk. (DEFRAG is a DOS command on DOS versions later than 5.0). It is not necessary
to run DEFRAG if the program indicates that the disk is less than 5% fragmented.
[ ] Run a computer virus checker (any major brand that is current for latest virus types).
[ ] Clean the fan filters, paying special attention to the computer fan filter.
[ ] Clean all exterior metal surfaces, and wipe off the rails.
[ ] Clean the monitor screen, keyboard and printer.
Guide Rail and Bearing Maintenance
On all 4500 models, a guide rail and two guide bearings (AY) are located at the lower back of the
C-arm. Another guide rail and two guide bearings (TX) are located on the right side running front
to back just below the table. (See Figure 7-1).
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