Dolev 800 - Loading/Unloading System -
Film Spreader Assembly   

See FCO 17684    12-JUL-93
See FCO 18992 06 Mar 94 - Replacing Pounded Anti-Static Disk

Film Spreader Shelf Assy
Film Spreader Wheels
Film Spreader Home & End Position Detectors
Film Spreader Motor
Film Spreader Chain(Roller Motor Chain #20)

Film Spreader Shelf Assy

OptoMechanical Assy (zoom image)
Optomech 800P (zoom image)

Replacement Procedure
Test Procedure

Replacement Procedure

Change Procedure for Dolev 800
Change Procedure for Dolev 800P

Change Procedure for Dolev 800

Refer to drawing 731E8A834 - Dolev o/m assembly.

1. Open the left and right service doors.
   
   
2. Remove the light proof covers from both sides.
   
   
3. Rotate the spreader to a convenient position far away from the loading unloading. The up position is recommanded.
   
   
4. Release the screws (#44, #109) on both sides.
   
   
5. Remove the whole spreader assembly.
   
   
6. Install the spreader assembly back in the plotter
   
   
7. Reinstall the covers and close the side doors.

Change Procedure for Dolev 800P

Refer to drawing 731E8F262 Dolev 800P o/m assembly.

1. Open the left and right service doors.
   
   
2. Remove the light proof covers from both sides.
   
   
3. Rotate the spreader to a convenient position far away from the loading unloading. The up position is recommanded.
   
   
4. Release the five screws (#106) that hold the spreader assy. Remove the spreader.
   
   
5. Install the spreader assembly back in the plotter.
   
   
6. Install the light covers and close the service doors.

Test Procedure

1. Load and unload film and make sure that no scratches appear and the film is not touching the lead screw.
   
   
2. Check the presssure of the pressure rollers on the spreader.
   
   
3. Load film from the cassette located on the other side of the dynamic optic and check that it is not banded or wrinkled. Try to use the end of the film roll.
   
   
4. Expose the film and check that the rubber wire is not omitting shades. If there are shades present, shorten the wire and try again.

Film Spreader Wheels

OptoMechanical Assy (zoom image)
Optomech 800P (zoom image)

Description
Adjustment
Check

Description

The spreader should not touch the drum in the up position without the film and should lightly touch the film. If adjustment is needed, remove it from the plotter and adjust each of the wheels to be approximately 1mm below the top position. The spreader assembly shoud be parallel to the drum.

Adjustment

The wheels are adjusted by screw #172. Locking the screw will press the wheels out while releasing the screw will free the wheels. Rotate the screw till the wheels are in the top position and release ti to 1mm below the top position.

Check

1. Make sure that the wheels do not cause any scratches.
   
   
2. Make sure that the wheels do not rotate when there is no film on the drum (in the up position) and that they will roll freely on the film (should lightly touch the film).

Film Spreader Motor

OptoMechanical Assy (zoom image)

Description
Replacement
Check

Description

The film spreader motor (#35) drives the chain located on the left flange (#1) of the imagesetter drum. The chain drives the film spreader mechanism. The film spreader and the vacuum system work together to hold the film to the inner surface of the drum.

Replacement

Before You Start
Tools and Accessories
Disassembling the Film Spreader Motor (#35)
Assembling the Film Spreader Motor

Before You Start

1. Power off the imagesetter using the control panel ON/OFF switch.
   
   
2. Open the left and right service doors.
   
   
3. Remove the light-proof cover from both sides of the unit.

Tools and Accessories

Set of Allen keys

Disassembling the Film Spreader Motor (#35)

1. Release (do not remove) the screws (#30,23,24) that hold the two tension brackets (#31).
   
   
2. Unscrew the phillips screw (#116) that holds the chain to the flange.
   
   
3. Release the chain from the flange (#1) and the motor system.
   
   
4. Remove the screw (#23,24,30) on the sensor plate (#36).
   
   
5. Measure the distance of the motor sprocket from the motor and write it down so that you may reference this when re-assembling. Remove the sprocket (#32) from the motor shaft.
   
   
6. Remove the back cover of the motor. Mark and disconnect the wires on the back of the motor.
   
   
7. Remove the motor mount screws. Be careful not to remove the mounting plate (#18) screws (#27,28,29).

Assembling the Film Spreader Motor

1. Install the new motor in position.
   
   
2. Assemble the sprocket (#32) in position on the shaft at the distance measured when you dismantled the motor. (step 5 of 'Disassembling the Film Spreader Motor')
   
   
3. Re-assemble the chain.
   
   
4. Check that the chain is in a parallel line between the flange and the motor shaft sprocket (#32). If there is a problem, open the set screw in the sprocket (#32) on the motor shaft.
   
   
5. Adjust the encoder wheel (#34) so that it is centered on the encoder auto-coupler (sensor).
   
   
6. Connect the motor wires on the motor and put back the cover.

Check

Enter the diagnostics program. Select UTILITIES, MECHANICS. Select 2. Roller from the Mechanics Menu.

Mechanics Menu

From the roller (Film Spreader) menu, select Encoder. Monitors Roller (Film Spreader) encoder frequency.

A frequency of 25Hz is required during Film Spreader movement toward Home and End position.

Film Spreader encoder frequency cannot be measured during Film Spreader task checking.

Replace all of the light-proof covers. Close the service doors.

Film Spreader Chain(Roller Motor Chain #20)

OptoMechanical Assy (zoom image)
Optomech 800P (zoom image)

Description
Replacement
Test

Description

The film spreader chain is located on the left flange (#1) of the imagesetter drum. The chain drives the film spreader mechanism. The film spreader and the vacuum system work together to hold the film to the inner surface of the drum.

Replacement

Before You Start
Tools and Accessories
Disassembling the Film Spreader (Roller) Motor Chain (#20)
Assembling the Film Spreader (Roller) Motor Chain (#20)

Before You Start

1. Power off the imagesetter using the control panel ON/OFF switch.
   
   
2. Open the left and right service doors.
   
   
3. Remove the imagesetter top back panel.
   
   
4. Remove the light-proof cover from both sides of the unit.

Tools and Accessories

Set of Allen keys
Phillips screwdriver (short shaft "bulldog")

Disassembling the Film Spreader (Roller) Motor Chain (#20)

1. Release (do not remove) the screws (#30,23,24) that hold the two tension brackets (#31).
   
   
2. Unscrew the phillips screw (#116) that holds the chain to the flange.
   
   
3. Release the chain from the flange (#1) and the motor system.

Assembling the Film Spreader (Roller) Motor Chain (#20)

1. Measure a length of new chain against the old chain. The acceptable chain length of the new chain is a that of the old chain plus two links.
   
   
2. Assemble the chain on the flange. Lead the chain over the tension bracket sprocket (#19) and the motor shaft sprocket (#32). Screw the chain onto the flange with the phillips screw (#166).
   
   
3. Set the tension on the chain by moving the two tension brackets (#31).
   
   
4. Once the tension is set, tighten the tension brackets.
   
   
5. Check that the chain is not twisted.
   
   
6. Check that the chain is in a parallel line between the flange and the motor shaft sprocket (#32). If there is a problem, open the set screw in the sprocket (#32) on the motor shaft.

Test

Enter the diagnostics program. Select UTILITIES, MECHANICS. Select 2. Roller
from the Mechanics Menu:

Mechanics Menu

Run ROLLER to move the Film Spreader (Roller) to End Pos., Home Pos., or Move to Pos. Listen for smooth operation. Replace all of the light-proof covers. Close the service doors.