Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
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3.4.3 Adjust Belt Tension
3.4.3.1 Check Belt Tension
Check for proper tension on the AR, TX and TY motor drive belts. Perform the tension
adjustment for any belt that is loose.
3.4.3.2 Adjust Arm R Belt Tension
1. Loosen the belt tension block (two 1/4" bolts).
2. Adjust the tension nut so that the spring is compressed to 7/8" from the inside of
one washer to the inside of the other washer.
3. Tighten the tension block bolts.
3.4.3.3 Adjust Table X Belt Tension
1. At the encoder end of the belt, loosen the tension spring and tensioning nut.
2. Tighten the tension nut so that the spring is compressed to 7/8 inch. The bracket
cutout can be used as a measuring guide (the inside of the washer should be flush
with the bracket cut).
3. Tighten the two mounting bolts holding the tension block.
3.4.3.4 Adjust Table Y Belt Tension
1. At the encoder end of the belt, loosen the 2 bolts holding the tension block.
2. Install the tension spring and tensioning nut.
3. Tighten the tension nut so that the spring is compressed to 7/8 inch. The bracket
cutout can be used as a measuring guide (the inside of the washer should be flush
with the bracket cut).
4. Tighten the two mounting bolts holding the tension block.
3.4.3.5 Adjust C-Arm Y Belt Tension
1. Move the C-Arm to the center of the table.
2. Turn off the Discovery computer power and main circuit breaker on the rear of
the foot end pedestal.
3. Remove the Electronics Tray covers.
4. Loosen the two mounting bolts holding the belt tension block.
5. Adjust the tension nut so that the spring is compressed to 7/8 inch.
6. Tighten the two mounting bolts holding the tension block.
CAUTION: Do not move the C-arm or the table more than 1"/second with the power off.