Riso MZ1070, Technical Manual, Page: 23 / 150

[ 3-23 ] MZ870 / MZ890 / MZ1070 / MZ1090 (Revision 0.9)
MAIN DRIVE SECTION
Removing the Main Belt
1. Turn OFF the machine power and disconnect the power cord from the machine.
2. Remove the rear left and rear right covers and open the Mechanical control PCB.
3. Remove the two Pressure springs, one for the No.1 Print drum and the other for the No.2 Print drum.
4. Remove the mounting screws (4 pcs) from the Pressure control unit and push the unit away to the left
to make working space.
5. Remove the Main belt tensioner plate assembly. (2 screws & 2 cap screws)
Caution:
Before loosening the screws and cap screws, make sure to memo down the belt tension scale setting.
The tension should be made a little tighter after the assembly.
6. Remove the Main motor shaft bracket. (4 screws)
7. Remove the Belt load reinforce plate. (4 screws)
8. Remove the Tensioner base plate. (4 screws)
9. Remove the Main cover. (7 screws)
10. Remove the Pressure cam assembly for the No.1 Print drum. (3 screws)
11. Remove the Main belt.
< Following steps No.1 through No.8 are the steps taken in removing the Main motor assembly.>
Pressure cam assembly
Main belt