REPLACEMENT PROCEDURES
8.2 SERVICE COVERS
Six removable service covers afford access for drive maintenance. Also, a small control panel cover, located on the upper front panel, must be removed to replace in dicator holders (not indicators) and operating switches.
8.2.1 Front, Upper Rear, and Lower Covers REMOVAL
To remove covers, grasp upper edge and pull cover away from frame, lifting to dis engage cover hangers from lower supports on frame.
INSTALLATION
Engage cover hangers in frame supports and push cover to engage friction latches.
8.2.2 Right and Left-Hand Side Covers
The right- and left-hand covers are interchangeable. Either cover is removed and in stalled as follows:
REMOVAL
1. Remove front and lower rear covers.
2. Remove two screws that fasten side cover to drive frame near upper cor ners of cover.
3. Lift cover and pull away from frame.
INSTALLATION
1. Engage cover hangers in frame support and hold cover in place.
2. Fasten cover to drive frame with two screws.
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8.2.3 Top Cover Assembly
The top cover assembly comprises both the operator and the service cover. When the top cover assembly is in place on the disk drive, it engages a switch that is interlocked with the START/STOP switch. The interlock switch must be overridden to operate the drive if the top cover assembly is removed.
REMOVAL
1. Remove upper rear cover.
2. Push rear retaining clamps on top cover assembly forward to release mounting studs.
3. Lift top cover assembly from rear to free it from studs.
4. Slide top cover assembly forward to separate it from apron flange at front of frame, and lift top cover assembly off frame.
INSTALLATION
1. Position top cover assembly so its front engages flange on upper front of
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drive frame.
2. Grasp rear of top cover assembly and slide it backwards to align its mounting holes above mounting studs at rear of drive frame.
3. Inspect lower front edge of cover to make sure that apron flange is
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seated properly inside of top cover assembly.
4. Push rear retaining clamps on the top cover assembly to the rear to engage mounting studs.
8.2.4 Operator Control Panel Cover (Figure 8-1)
The operator control panel cover is fastened to the upper front panel of the disk drive by adhesive tape around the inner periphery of the cover. To remove the cover, gently insert a screwdriver between the middle of right-hand edge of cover and panel and pry off cover. Be careful not to disfigure the panel or cover.
To install cover, position cover with left-hand edges of cover and panel recess exactly
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aligned. Push cover against panel recess and push all around cover periphery with thumb.
8.3 FILTERS
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Three replaceable filters are used in the air circulating system: two foam filters (exterior and interior) trap the larger airborne particles, and an absolute filter traps the smaller airborne particles.
Do not aempt to clean and reuse these filters. They are not reclaimable and must be discarded after use. These filters are replaced as part of the preventive maintenance schedule of Table 5-1. These filters should also be replaced between schedule dates
if they become dirty and excessively limit air flow.
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The time between replacements of the absolute filter is dependent upon the environmental conditions (dust level) in which the equipment is operated.
8.3.1 Exterior Foam Filter (Figure 8-2)
The exterior foam filter is located behind the lower rear cover in the inlet air duct.
REMOVAL AND INSTALLATION
1. Remove lower rear cover.
2. Locate and remove old filter by pulling it from duct opening. Discard old filter.
3. Install new filter by positioning it in recess at duct opening.
4. Replace lower rear cover.
8.3.2 Interior Foam Filter (Figure 8-5)
The interior foam filter is located directly behind the operator control panel.
REMOVAL AND INSTALLATION
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1. Raise top service cover.2. Locate and remove interior prefilter by grasping plunger fastener knobs on filter retaining frame and pulling upward.
3. Remove old filter and discard.
4. Position new filter in filter retaining frame, making sure that fastener plungers are pulled out. Then push in plungers to secure frame.
5. Close service cover.
8.3.3 Absolute Filter REMOVAL
1. Place CB1 to OFF.
2. Remove front cover.
3. Disconnect blower power cable at quick-disconnect.
4. Loosen hose clamp that secures blower exit duct to blower plenum as sembly and slide off duct.
5. While supporting blower by hand, remove filter locking rod that holds top of blower plenum to top of inlet filter duct.
6. Lift blower plenum assembly up and away from absolute filter, disengag ing plenum ears from slots in bottom flange of air system support plate.
7. Pull absolute filter straight out from air inlet duct.
8. Discard used absolute filter.
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INSTALLATION
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NOTE: Observe direction on side of new fil ter. Filter must be installed so ar—
row points toward blower and is at top or visible side of absolute filter.
1. Place absolute filter on flange of air system support plate and push against air inlet duct to expose slots in flange.
2. Engage blower plenum ears in flange slots and, pushing against blower, hold plenum against absolute filter.
3. Replace filter locking rod, fastening blower plenum to inlet filter duct.
4. Attach blower and tighten clamp.
5. Connect blower power cable at quick-disconnect.
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6. Replace front cover.