4.1 PRINTER MECHANISM ADJUSTMENTS 4-1
4.1.1 PG Motor Backlash Adjustment 4-1
4.1.2 Carriage Timing Belt Tension Adjustment 4-2
4.1.3 Tractor Wire Spring Tension Adjustment 4-3
4.1.4 Pull Tractor Sensor Position Adjustment 4-4
4.1.5 Carriage Guide Shaft Parallelism Adjustment 4-5
4.1.6 Platen Angle Adjustment 4-9
4.1.7 Platen Gap Motor Value Adjustment 4-12
4.1.8 Measurement Seeking and Bi-directional Printing Adjustment 4-15
This section describes the printer mechanism adjustments for the DFX-8500. Whenever the printer is disassembled and the printer parts mentioned in this section are replaced or repaired, perform the appropriate adjustments to ensure proper printer operation. Perform adjustments before assembling the printer.
In the PG motor backlash adjustment, the PG motor pinion gear must mesh smoothly with the PG transmission gear cog. If the pinion gear is poorly aligned or the pinion gear and cog are too tight, printer operation is noisy or the character density is incorrect.
; If the PG motor backlash is too tight, PG motor doesn't rotate smoothly and the panel indicates "E3."
Step 1: Loosen the two screws securing the PG motor to the left side frame. (Refer to Section 188.8.131.52) Step 2: Make sure the PG motor pinion gear is properly aligned with the PG transmission gear cog. Move the PG motor until there is 0.05 to 0.15 mm (0.002 to 0.01 inches) between the PG motor pinion gear and PG transmission gear cog. Then tighten the two screws.
4.1.2 Carriage Timing Belt Tension Adjustment
The carriage timing belt tension must be adjusted when any carriage mechanism part (such as the CR motor, belt pulley, or carriage timing belt) is disassembled. Remove the printer mechanism before performing this adjustment. (Refer to Section 3.2.6)
; Before performing this adjustment, carefully secure the printer mechanism because a 7 kg (15.4 lb.) force is applied to it when the tension lever is pulled in the horizontal direction.
Step 1: Loosen the three tension adjustment screws on the CR motor. Confirm that the carriage timing belt is attached properly and that no load is applied to it. Step 2: Insert the tension gauge hook through the hole in the tension lever. Step 3: Pull the tension gauge horizontally to apply a 7 kg (15.4 lb.) force.
Step 4: Move the belt left and right while pulling the tension gauge, and move the motor pulley slightly. Step 5: Tighten the three CPS(M4x10) tension adjustment screws and secure them while the 7 kg (15.4 lb.) force is applied.
Step 6: Finish tightening the three tension adjustment screws with 12 Kg cm torque.
4.1.3 Tractor Wire Spring Tension Adjustment
This section describes the tractor wire spring tension adjustment. If the spring is not adjusted properly, paper jams may occur, because the continuous paper tension (in the horizontal direction) is incorrect. When you remove the front or rear tractor assembly, perform this adjustment.
Step 1: Remove the printer mechanism. (Refer to Section 3.2.6)
Step 2: Release the release levers for the tractor sprockets on the front.
Step 3: At the left side frame, loosen the CBS(M4 X 8) screws securing the wire holding plate (L).
Step 4: Pull the tractor wire left to make correct tension to the tractor wire, wire holding plate ( R) and the tip of the gold seal are 5 mm (0.2 inches) apart. Step 5: Fix the CBS(M4 X 8) screws on the wire holding plate (L). Step 6: As the same manner, adjust the tractor spring tension for the rear tractor.
4.1.4 Pull Tractor Sensor Position Adjustment
This section describes the pull tractor sensor position adjustment. If the sensor position is incorrect, the sensor is always on. When you replace or disassemble the platen, rear paper guide, platen roller shaft, tension roller shaft, or pull tractor sensor, perform this adjustment. Figure 4-4 illustrates the pull tractor sensor position adjustment.
When you assemble the pull tractor sensor or rear paper guide, check the following items:
• Verify that the pull tractor sensor lever is touching the rear paper guide frame, but the sensor is off.
• Make sure the distance between the sensor lever and sensor switch is approximately 2 mm (.08
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