• Stepper Motor
• Lead Screw Assembly
• Home Position Detector
• Replacing End Position Detector

• Carriage Movement Improvement at End Position (memo)

Stepper Motor

• Carriage Stuck at Service Speed (memo)
• Stepper Problems, Carriage get stuck Problems (memo)

Overview

The Stepper Motor is attached to the Lead Screw Assembly on the Imagesetter left side. This motor controls revolution of the lead screw during exposure.

The Stepper Motor may require replacement due to malfunction.

The Stepper Motor operates the Leaad Screw which moves the Dynamic Optics Carriage.

Disassembly

On the Imagesetter left side, separate the Stepper Motor from the Lead Screw Assembly by removing its four (4) hex screws and disconnecting its electrical connector.

Assembly

Reverse the disassembly procedure described above.

Lead Screw Assembly

• FCO 21645 Lead Screw & Stepper Motor Dampers (memo)
• New Leadscrew - Carriage Coupling (memo)
• New Coupling ( Carriage - Leadscrew ) (memo)
• Dolev 4press New Dampers New Parameters (memo)
• Dolev Family - Dampers (Dolev 200/250/400/450, Dolev 4News, Dolev 4press) (memo)

Carriage Assembly

Overview

General Description

The lead screw is located at the heart of the Imagesetter, in the center of the V-block which runs lengthwise along the Imagesetter drum. It is used to move the Dynamic Optics Assembly through the Imagesetter drum during exposure.

The lead screw may require replacement due to damage caused during operation, excessive wear, or improper manufacture.

Disassembly

1. From the Utilities menu, move the Dynamic Optics Carriage to its end position (EP) in the Imagesetter.
2. Power down the Imagesetter.
3. Open both left and right Imagesetter doors.

Releasing Lead Screw

4. Remove the inertia damper located on the right side of the Imagesetter by removing its two (2) hex screws.
5. Release the three (3) recessed hex screws securing the lead screw from the Imagesetter right side. You will need an extension wrench to access these screws. You do not to remove these screws completely.
6. On the Imagesetter left side, separate the Stepper Motor from the Lead Screw Assembly by removing its four (4) hex screws and disconnecting its electrical connector.
7. Remove the Dynamic Optics chain holder by removing its two (2) hex screws. Allow the chain holder to rest alongside the V-block.
8. Disconnect the Dynamic Optics Assembly electrical connector by removing its securing screw.
9. Remove the four (4) hex screws securing the Lead Screw Assembly to the left side of the V-block.
10. Slowly withdraw the Lead Screw Assembly from the Imagesetter. Be careful not to disturb the Dynamic Optics carriage.

Assembly

Reverse the disassembly procedure described above.

Home Position Detector

• H.P. Calibration Error (memo)

Description

The home position detector is assembled on the lead screw bearing plate. It is located on the optomechanical assembly guide beam, or carriage. Its function is to mark the starting point of the carriage movement.

Checking

1. Enter the diagnostics program.
2. Select UTILITIES.
3. Select the Adjustment menu.
4. Select H.P. Calibration. It will send the carriage to Home position in fast motion. It reads the micro steps offset.

Replacement

Diassembly

1. Power off the imagesetter using the control panel ON/OFF switch.
2. Open the left and right service doors.
3. Disconnect the home position detector cable connector on the left side of the machine.
4. Dismantle the two screws that hold the home position detector base to the guide beam and pull the assembly out.

Assembly

1. Assemble the home position detector on the guide beam. Try to keep the flag on the carriage passing through the center of the detector and try to keep it located as close as possible to the previous detector location. Tighten the two screws.
2. Connect the cable connector back to the home position detector.
3. Enter the diagnostics program. Select UTILITIES. Select Adjustment menu. Select H.P. Calibration. It will send the carriage to Home Position in fast motion. It reads the micro steps offset.

The test passes if the offset is between 125 and 375. Correct the location of the H.P. by trapping on the home position detector with the back of a screwdriver until the reading received is in the middle of the correct zone.

Replacing End Position Detector

Disassembly

1. Disconnect the end position detector cable connector on the right side of the machine.
2. Dismantle the two screws that hold the end position detector base to the base plate. Remove the assembly.

Assembly

1. Assemble the end position on the guide beam. Try to keep the flag on the carriage passing through the center of the detector and try to keep it located as close as possible to the previous detector location. Tighten the two screws.
2. Connect the cable connector back to the end position detector.
3. Activate the DIAG/UTIL. From the Mechanics/Carriage menu choose F.P. (Feed Position) Detector. Correct the location of the end position detector by trapping on the detector with the back of a screwdriver until the reading received is in the middle of the correct zone.