Chapter 5 Removal And Replacement Procedures318Belt, Platen OpenRemoval1. Prepare the printer for maintenance (page 313).2. Cabinet Model: Remove the paper guide assembly (page 348).Pedestal Model: Remove the top cover assembly (page 327).3 Remove the platen open belt cover by squeezing the top and bottom to release the plastic tabs from the slots in the sideplate (page 413, Figure 45, item 24).4. Using a 5/32 inch Allen wrench,slowly loosen the motor adjustment screw just enough to permit movement of the platenopen motor in the slotted side plate (page 416, Figure 46, item 19).5. Push the motor toward the front of the printer to loosen the platen open belt.6. Remove the platen open belt by sliding the belt off the platen open pulley.Installation1. Slide the platen open timing belt over the platen open pulley and the motor pulley and tighten the 1/16 inch setscrew.2. Slide the motor pulley onto the platen open motor shaft and tighten the pulley setscrew.ATTENTION Too much tension on the platen open belt can cause the platen gap to change, which can lead to premature wear ofthe platen, damaged hammer tips, and poor print quality.3. Slide the platen open timing belt over the platen open pulley and the motor pulley.4. The spring will automatically tension the belt.5.Slowly tighten the motor adjustment screw (page 416, Figure 46, item 15).NOTE: Belt tension is correct if the belt deflects 3/16 inch midway between the pulleys. If deflection is more or less than 3/16inch, slowly loosen the motor adjustment screw and repeat steps 3 through 5.6. Snap the platen open belt cover into the slots in the side plate (page 413, Figure 45, item 24).7. Install the paper guide assembly (page 348).8. Return the printer to normal operation (page 314).
