Epson DFX-8500 service manual Printer Mechanism Adjustments, PG Motor Backlash Adjustment

ADJUSTMENT

4.1 PRINTER MECHANISM ADJUSTMENTS

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.

4.1.1 PG Motor Backlash Adjustment

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.

CAUTION

;￿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 3.2.6.4)

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.

P G T r a n s m is s io

0 . 0 5 -	0 . 1 5 m
P G M o t o r
P in io n	G e a r

S c r e w s

P G M o t o r

Figure 4-1. PG Motor Mounting Position Adjustment

Rev. B 4-1