Epson DFX-9000 - APTC Detection Position Adjustment

Epson DFX 9000 Revision B
Adjustment Software adjustment 241
5.3.3 APTC detection position adjustment
Summary
The APTC mechanism compares the number of APTC Motor drive
steps detected from home-position to the platen, and home-position to
the paper. The difference between these two distances is assumed to be
the thickness of the paper.
The number of APTC Motor drive steps to move the printhead a given
distance, e.g., from the APTC home position to the platen or paper, is
predetermined based on assumed mechanical dimensions. Due to
manufacturing variances of the components that comprise the APTC
mechanism, (APTC Motor, Carrier mechanism), the timing used to
detect the contact of the printhead with a target also varies, and this
affects the detection precision.
This adjustment is performed to determine the number of APTC Motor
drive steps necessary to compensate for the dimensional variances of the
APTC mechanism.
Figure 5-23. APTC detect position variance
This adjustment is required after you remove or replace these parts:
 PR MECHA ASSY
 CARRIER UNIT
 ROM BOARD (only when the EEPROM Data Copy fails)
Tools / materials: Adjustment Program
Paper: 1 sheet of 64 g/m
2
(17 lb) paper
10 sheets of 50 g/m
2
(13 lb) paper
APG PT Jig (P/N: 1422622)
APG Gauge Jig (P/N: 1422621)
C H E C K
P O I N T
Before performing this adjustment, make sure to perform
the “TOF Sensor Sensitivity Adjustment” Refer to TOF
sensor sensitivity adjustment (p. 235).