Epson DFX-8500 - Impact Printer, Service Manual

Page: 167 / 245

ADJUSTMENT
Rev. B
4-15
4.1.8 Measurement Seeking and Bi-directional Printing Adjustment
The purpose of this adjustment is to correct the printer mechanism parameters which control bi-directional
printing. Be sure to perform this adjustment when required. If this adjustment is not performed correctly, bi-
directional printing may be miss-aligned, or, in the worst case, the carriage might operate incorrectly. Before
performing this adjustment, be sure to that the following adjustment are completed correctly.
4.1.2 Carriage Timing Belt Tension Adjustment
4.1.5 Carriage Guide Shaft parallelism Adjustment
4.1.6 Platen Angle Adjustment
4.1.7 Platen Gap Motor Value Adjustment
The parameters to be written to the EEPROM on the C204 Main board in this adjustment are as follows:
1) Measurement seeking
2) Print head flight time adjustment value
3) Bi-directional printing alignment value for each speed mode, Super Draft, Draft, and NLQ
;
If the DIP-SW "3-5" is set to the IBM mode (On), it can not perform the Bi-D adjustment. Therefore,
when you perform the Bi-D adjustment, set the DIP-SW"3-5" to Off.
;
When replace the C204 Main board, the ALPHA and BETA values are not written into the memory
(In reality, "0" value is installed.) on the Main board. Since this reason, (Since PG is too large) it can
not print the each current value to the paper. Due to this, Perform the platen gap value adjustment
before perform this adjustment.