Product

Kodak^® Magnus^® 800 multi-cassette unit (MCU)

Symptoms

The timing belt teeth do not mesh with the tension pulleys’ teeth, which in turn adversely effects the motion of the MCU elevator.

Cause

• The timing belt is not set to the optimum tension
• The MCU runners are not parallel to the MCU floor

Solution

Before you begin these procedures, make sure you have the following:

• Lead screw jig (690-01031A)*
• Measuring gauge jig (690-01056A)*
• BrecoFlex^® frequency sensing device (90-1062)
• M17 wrench
• M10 wrench

****The lead screw jig and measuring gauge jig are included in the
**** Magnus 800 kit - jigs and tools (516-00021A), but the two jigs may
**** also be ordered separately.

1. Remove the following panels:
   1. MCU rear panel.
   2. MCU E-box cover.
   3. MCU E-box panel.
   4. All the skirting panels covering the timing belt.
      
      
      
      
   5. Autoloader service door (located beneath the cassette feeder motor).
2. Loosen the timing belt.
   1. Use an M17 wrench to release the two tension pulley bolts.
      The bolts are located on the underside of the tension pulleys.
      
      
      
      
   2. Use an M10 wrench to close the lead tension screw and thus decrease the tension on the timing belt.
      
      
      
      Note: When the lead tension screw is closed, the tension spring expands, causing the two tension pulleys to move further apart. As the distance between the two tension pulleys increases, the timing belt becomes slacker (less tense). When the tension on the timing belt is slack enough the belt falls off the four pulleys (located on each corner of the MCU).
3. Use a tape measure to determine the approximate height from the MCU floor to the ends of the first cassette tray runners.
   Note: Each runner end is located near to one of the four lead screws.
   By measuring the height of each runner end to the MCU floor, the service engineer is able to determine the lowest runner end.
   
   
   
   
4. Manually rotate each individual lead screw pulley until the height from the MCU floor to each runner end is approximately equal (±2 mm).
   • Use the height of the lowest runner end (see step 3) as the reference height for the three remaining runner ends.
   • Each full rotation of a pulley adjusts the height of the runner by approximately 5 mm.
5. Install the timing belt.
   1. Make sure the teeth on the timing belt are facing the teeth on the pulleys.
   2. Make sure both sets of teeth mesh.
   3. Increase the tension on the timing belt by opening the tension screw until it rotates freely.
      Note: As the screw opens, the tension spring contracts, causing the two tension pulleys to move closer together. As the distance between the two tension pulleys decreases, the timing belt becomes more tense.
   4. Retighten the two tension pulley bolts.
6. Carefully move the MCU elevator until cassette number four is at the user door level.
7. Loosen the timing belt (see step 2).
8. Insert the lead screw jig (690-01031A) close to the end of a specific runner.
   
   
   
   
9. Place the measuring gauge jig (690-01056A) on the runner surface end closest to the jig.
   • Make sure the tail of the gauge is touching the top of the jig.
   • Set the gauge to zero.
     Note: The height of this runner end will be used as the reference height for the three remaining runner ends.
     
     
     
10. Use the jig and the gauge to individually measure the height of the remaining three runner ends. Rotate the individual pulleys so that the three runner ends are at the same height as the reference runner end.
    Important: The allowed tolerance deviation is 0.5 mm.
11. When all four runner ends are at the same height, reinstall the timing belt (see step 5).
12. Use the frequency sensing device and the table below to check the frequency of vibrations on different sections of the timing belt.
    
    
    
    

    Section Length	Frequency min.	Frequency max.
    mm	Hz	Hz
    1181	26	28
    1450	21	23
    668	45	50
    529	57	63

    
    
    
13. Remove the jig and gauge.
14. Calibrate the MCU.
15. Run the MCU sequence script.
16. Reinstall the following panels:
    1. All the skirting panels that cover the timing belt
    2. Autoloader service door (located beneath the cassette feeder motor)
    3. MCU rear panel
    4. MCU E-box panel
    5. MCU E-box cover

Technical contact(s)

Yaron Shifman

Submitted by

Yaron Shifman

Date submitted

30 Nov 2006