Dolev 800/800V/800V² - Assemblies
Carriage Motion Assembly
Stepper Motor

Optomech - lead screw & stepper (zoom image)
Optomech - lead screw & stepper - D800P (zoom image)
Optomech 800P (zoom image)

Description
Replacement of the Stepper Motor
Check

Description

The Stepper Motor (#154) (Cat. No. 504B29755) is located on the right side of the lead screw assembly. The Stepper Motor's function is to rotate the lead screw which moves the Carriage (Dynamic Optic) in the internal drum.

The Stepper Motor is driven by the Stepper Motor Driver Board (Cat. No. 503C25245) which is under the control of the CRI Board (Continuous Resolution Indexer). (503D29069)

Replacement of the Stepper Motor

Before You Start
Tools and Accessories
Parts - Stepper Motor Assembly
Access
Disassembling the Stepper Motor
Assembling the Stepper Motor

Before You Start

1. Prepare a clean surface with a lint free cloth.
   
   
2. Be sure that you have enough free space in and around the machine to pull the assembly out.

Tools and Accessories

Set of Allen keys
Mobil grease: Mobilux #2

Parts - Stepper Motor Assembly

Access

1. Power off the imagesetter using the control panel ON/OFF switch.
   
   
2. Open the right service door.
   
   
3. Remove the light-proof cover from the right side of the unit.

Disassembling the Stepper Motor

1. Remove the four screw and washers (#23, 26, 30) to remove the stepper motor.
   
   
2. Remove the stepper motor. Remove the motor cross (#146). It is not secured to the machine. Take care that the motor cross does not fall when removing the motor. Note carefully the distance between the parts mounted on the stepper axis (especially the pressure plate) and the motor. The pressure plate is 0.5 in from the body of the motor.
   
   The screws that go through the cross adaptor into the pressure plate must not touch the motor body.
   
   
3. Disconnect the cable from the stepper motor.
   
   
4. Remove the unit that consists of the pressure plate, locking element and ball screw. These parts are attached to the stepper axle, inside of the ball plate (#156).
   
   
5. Separate the pressure plate and the ball screw. Remove the locking elements.

Assembling the Stepper Motor

1. Reassemble the unit that consists of the pressure plate, locking element and ball screw onto the stepper axle, inside of the ball plate (#156). Remember to mount the unit at the same distance as it was originally mounted.
   
   
2. Assemble the motor on the stepper motor mount (#156).
   
   
3. Connect the wires to the stepper motor. Close the black motor cover.
   
   
4. Replace the light-proof cover.
   
   
5. Close the service door.

Check

Power on the imagesetter and check for smooth operation of the stepper motor.
Check home position calibration.
Check screen quality convention angle Res 100.
90 degrees, 45 degrees Vs 21 steps.