Bi-Directional Printing Adjustment - Epson DFX-8500 Service Manual

4.9 BI-DIRECTIONAL PRINTING ADJUSTMENT

The purpose of this adjustment is to correct the printer mechanism parameters that control bi-directional
printing. If the adjustment is not performed correctly, bi-directional printing may be misaligned, or the
carriage might operate incorrectly. Before performing this procedure, be sure that the following adjustments
have been completed correctly:


Carriage Timing Belt Tension Adjustment


Carriage Guide Shaft Parallelism Adjustment


Platen Angle Adjustment


Platen Gap Motor Value Adjustment
The parameters to be written to the EEPROM in this adjustment are:
1. Printhead flying time adjustment value (Flight Time)
2. Bi-directional printing alignment value for each print speed: Super Draft, Draft, and NLQ


Before you perform the Bi-D adjustment, turn DIP switch 1-6 off. Otherwise, the adjustment won't
work.


If you replace the main board, you must perform the platen gap adjustment before performing the bi-
directional printing adjustment.
CAUTION
ADJUSTMENT
4-15