Product

• ThermoFlex^® Mid
• ThermoFlex Narrow

Background

This procedure describes how to adjust the ThermoFlex focus motor to support both film and plates.

To support film and plates, the focus motor must move at least an additional 400 microns to the maximum plate thickness used at the site.

• Max. plate thickness 1.7 mm—check focus motor movement to a minimum of 2.1 mm
• Max. plate thickness 2.4 mm—check focus motor movement to a minimum of 2.8 mm

Requirements

• Optic head focus jig (PN 291B5A539)
• Fine dial gauge (PN 3905B10020)
• Distance focus jig
  
  

  690-00237A

  690-00238A

  690-00236A

Procedure

This procedure contains the following steps:

• Checking focus motor movement
• Checking the preload
• Adjusting the optic tube
• Adjusting the preload
• Rechecking the focus motor movement

Checking focus motor movement:

1. Open the front door and insert a motor interlock cheater.
2. Remove the loading tray and install the focus jig.
3. In ThermoFlex Controller, send the focus motor to HP.
4. On the micrometer jig, set the dial to zero.
5. In ThermoFlex Controller, send the focus motor to 2500 and check if the focus motor moves in one continuous motion.
• If the motor reaches 2500, proceed to Adjusting the Optic Tube.
• If the motor does not reach 2500, check and adjust the preload and then Adjusting the Optic Tube.
  Note: If the focus motor sticks, it may not have enough power to move the spring leaves. Try to increase the Vref of Stepper (V)[0-3] parameter to 2.8 volts.

Checking the preload

1. In ThermoFlex Controller, send the focus motor to HP.
2. On the micrometer jig, set the dial to zero.
3. Disconnect the power plug from the focus motor.
4. Rotate the focus motor disk clockwise so that the optic tube moves away from the drum until the gauge movement stops. The distance between the focus motor HP and the point at which the gauge movement stopped is called the Preload.

Adjusting the optic tube

1. In ThermoFlex Controller, move the focus motor to 250 ±30.
2. Release the two screws that hold the optic tube.

3. Place the lens to drum (tombstone) jig between the optic tube and the drum. Bring the optic tube closer to the jig and tighten the two screws.
4. Remove the lens to drum (tombstone) jig.
5. Loosen the holding screw on the mechanical stopper and move the stopper to the drum position.
6. Change the Max Pos App Value parameter value to 3000.
7. In ThermoFlex Controller, send the focus motor to 2800 and check if the motor moves at least 2700 microns. Increase or decrease the Max Pos App Value parameter value if required.
8. Using the focus jig, check if the motor moves at least 2700 ±20 microns .
• If the motor did not move 2700 ±20 microns—increase or decrease the value to which you sent the focus motor and try again, and repeat this step until the motor moves 2700 ±20 microns.
• When the motor moves 2700 ±20—verify that the two brackets shown following do not collide. If they collide, the focus motor may stop moving. Reduce the focus motor Pos parameter value to less than 2700, until the two brackets do not collide when the motor moves. Update the Max Pos App Value parameter value.

Note: If the customer does not need high values such as 2700, find the maximum focus APP value by trial and error, until the brackets do not collide.

9. When the motor moves 2700 ±20 microns and the two parts do not collide, tighten the two screws of the mechanical stopper at this position.
   
10. Change the Max Pos App Value parameter value to the value that produced the maximum focus position without collision.
11. From ThermoFlex Controller, send the focus motor to HP.

Adjusting the preload

1. In ThermoFlex Controller, send the focus motor to HP.
2. Remove the 3/32" hex screw that holds the focus coarse HP detector, and move the detector according to the preload value:
   • Preload value > 400 microns—towards carriage EP
   • Preload value < 200 microns—towards carriage HP
3. Insert and tighten the hex screw that you removed in step 2.
4. Reconnect the power plug to the focus motor and send the motor to HP.
   Note: Make sure that there is preload of 200-400 microns on the focus assembly leaf spring.
5. If preload is not within 200-400 microns, repeat steps 1-4.

Technical contact(s)

Content owner: Viki Arviv
See the Escalation page for escalation contacts.

Date submitted

22 Aug 2001