CAPSTAN, REELS, AND BLOWER

7.4.1 CAPSTAN MOTOR REPLACEMENT

1. Switch off the main circuit breaker.

2. Disconnect J18 from the vacuum blower and J16 from the capstan motor.

3. Remove the four screws securing the vacuum blower adopter to the deck casting. Remove the blower and adopter assembly.

4. Remove all screws securing the vacuum plenum cover to the deck casting. Remove the seal from around the capstan motor and remove the plenum cover.

5. At the front of the deck casting, remove the screw securing the capstan to the motor shaft. Remove the capstan.

6. Each of the three capstan motor mounting screws retain a spring between the capstan motor and the deck casting. These springs are required during reassembly and are critical to proper operation.

Loosen the three screws securing the capstan motor to the deck casting while supporting the capstan motor from the rear but do not pull the screws from the casting unti.1 access is available to remove the springs from the rear. Remove the springs and store them safely for reas·sembly.

7. All components are reassembled in reverse order of disassembly. The capstan motor should be positioned with the tach cable to the left (as viewed from the rear) and should be routed through the groove in the casting directly below

the motor.

The three capstan motor mounting screws should be inserted through the front of the casting and the springs slid on the exposed threaded portions of the screws from the rear.

8. With the springs properly placed on the screws, install the motor and tighten the screws firmly.

95521 EC 49430

Kit PN 94786-1 7-17

9. Replace the plenum cover ensuring that the small diameter of the seal around the capstan motor fits properly into the plenum cover. Check that all cables emerging from the vacuum plenum are located properly in their respective slots in the deck casting prior to completely tightening the plenum cover retaining screws.

10. Reinstall the vacuum blower and adopter assembly.

all electrical connectors.

Reconnect 11. Perform the tape tracKing and skew procedure (Section 6.4).

7.4.2 FILE REEL HUB REPLACEMENT

1. Remove the three socket-head screws securing the hub cover to the hub assembly. Remove the hub cover.

2. Remove the three socket-head screws securing the hub assembly to the clamp collar. Slide the hub off the reel motor shaft.

If only the hub is being replaced, it is not necessary to remove the clamp collar.

3. Slide the replacement file reel hub assembly on the reel motor shaft. Align the screw holes in the hub with the holes

in the clamp collar. Insert the mounting screws and tighten securely.

4. Reinstall the hub cover, using care not to overtighten the screws as damage to the hub cover may occur.

5. Power up the MTS, load a work tape, and enter maintenance program 00 to run tape forward. Check that tape does not contact either flange of the reel. Perform the same check using maintenance program 01 to run tape backward.

If necessary, use the clamp collar to reposition the hub until the tape wraps on the reel without contacting the reel flanges.

6. Check the alignment and operation of the file protect sensor.

7-18

To check for proper operation of file protect, load a work tape with a write enable ring installed and check that the File Protect indicator turns off. Unload the tape, remove the ring, reload the tape, and check that the File Protect indicator is illuminated.

EC 49430

Kit PN 94786-1 95521

•

7.4.3 FILE REEL MOTOR REPLACEMENT

1. Switch off the main circuit breaker.

2. Disconnect J14 from the file reel motor.

3. Remove the three socket-head screws in the hub cover. The hub cover can now be removed by opening the hub latch and pulling off the cover with a slight counterclockwise twist to clear

the hub latch.

4; Remove the three screws securing the hub assembly to the clamp collar and remove the hub assembly.

5. Loosen the 3/16-inch socket-head screw holding the clamp collar to the motor shaft and slide the collar off the shaft.

6. Remove the three screws securing the reel motor to the deck casting and remove the motor.

7. Reassemble in reverse order. The inner edge of the clamp collar should be positioned 0.338 inch from the front of the reel motor .

8. To check for proper alignment of the reel to the tape path, power up the MTS, mount and load a work tape, enter maintenance program 00, and run tape forward to EDT. Rewind while observing the tape as it wraps back on the file reel:

The tape should not contact either flange of the reel. If necessary, use the clamp collar to reposition the hub until the tape wraps on the reel without contacting the reel flanges.

9. Check the alignment and operation of the file protect sensor.

To check for proper operation of file protect, load a work tape with a write enable ring installed and check that the File Protect indicator turns off. Unload the tape, remove the ring, reload the tape, and check that the File Protect indicator is illuminated.

95521 EC 49430

Kit PN 94786-1 7-19

7.4.4 MACHINE REEL MOTOR REPLACEMENT 1. Switch off the main circuit breaKer.

2. Disconnect J15 from the reel motor.

3. Remove the machine reel cover.

4. Remove the three screws securing the machine reel hub cap to the hub and remove the cap and outer flange.

5. Remove the three screws securing the hub assembly to the clamp collar and remove the hub assembly.

6. Loosen the 3/16-inch socKet-head screw holding the clamp collar to the motor shaft and slide the collar off the shaft.

7. From the front of the decK casting, remove the four screws securing the machine reel motor to the deck casting. Remove the motor.

8. Install the replacement reel motor.

9. Install the clamp collar on the replacement reel motor shaft.

The inner edge of the clamp collar should be positioned 0.110 inch from the front of the reel motor.

10. Reassemble all components.

11. To checK for proper alignment of the reel to the tape path, power up the MTS, load a work tape, and enter maintenance program 00 to run tape forward. Tape should not contact either flange of the reel as it wraps on the machine reel.

The column door and the machine reel cover may be removed once tape has been loaded to allow observation of the machine

reel area.

7-20

If necessary, use the clamp collar to reposition the hub on the motor shaft until tape wraps on the reel without contacting the reel flanges.

EC 49430

Kit PN 94786-1 95521

7.4.5 VACUUM BLOWER REPLACEMENT

1. Switch off the main circuit breaker.

2. Disconnect J18 from the vacuum blower.

3. Remove the four screws securing the vacuum blower to the vacuum blower adapter. Remove the blower and the blower plate.

4. Remove the blower plate from the blower and install on the plate on the replacement blower.

5. Reassemble in reverse order. When installing the four screws, ensure that the threads of all screws are sufficiently caught before completely tightening anyone screw. Reconnect Ji8 and check out the subsystem by performing several tape load operations.