Quantum QT-740, Руководство по обслуживанию

Страница: 44 / 64

Chapter 4 Service Instructions
38
Models QT-740 & QT-750 - Service Manual
WARNING! Exercise extreme care to insure the
safety of service or other personnel in the area.
DO NOT insert hands, tools, etc., into the Scissors
Assembly area while power is on.
7. Check table travel by driving the table down and then up. Make
sure that nothing is binding or pulling during the up/down travel
movement.
8. On PBL systems, verify table/collimator S.I.D. Interlock feature
operates correctly.
9. Replace the upper and lower table covers (refer to Assembly and
Installation, Chapter 2).
10. Place a loaded cassette into the bucky tray and take a projection.
Inspect the film to determine whether the bucky and collimator
are still in alignment.
Lubrication
Model QT-750 tables require lubrication at the locations shown in Figures
15 and 16 at least every twelve months. Model QT-740 requires lubrica-
tion at the locations shown in Figure 16 at least every twelve months.
REMOVAL/REPLACEMENT PROCEDURES
The following procedures provide step-by-step instructions for removal and
replacement of the repairable components in the table.
Replacing the Drive Belt (Model QT-750 Tables Only)
WARNING! Make sure to remove any objects from
the tabletop before continuing.
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket.
4. Remove four (4) hex bolts securing the DC Motor to Table Base
Plate (see Figure 17).
5. Remove Drive Belt from pulley.
6. Install replacement Drive Belt on pulley.
7. Install, but do not tighten, four (4) hex bolts securing DC Motor
to the Table Base Plate.
8. Adjust belt tension by sliding DC Motor toward front end of Table
Base Plate. When belt tension is set, tighten DC Motor mounting
screws.