Pg Adjustment - Epson Stylus Photo PX650 Service Manual

Epson Stylus Photo PX650/TX650/TX659/PX660/PX660 Premium/Artisan 635

5.3 PG Adjustment

Described below is the platen gap (PG) adjustment.
 Purpose:
Adjust the distance between the head surface and the Front Paper Guide Assy
(platen) properly and adjust the parallelism on the 0-digit side and on the 80-digit
side to ensure reliable print quality.
Once the CR Unit and/or Adjustment Bushes have been removed or whenever
necessary for any other reason, make this adjustment to correct the deviation of the
platen gap.
Table 5-5. PG Positions
Application for Printing
PG Size
Position (selected from PG flag list for
(mm)
normal/head rubbing)
PG- EPSON special thick paper
1.2
<APG Home> PGPP, Postcards, Matte, etc.
Plain paper
PG typ.
<Mechanical 1.7 EPSON special thin paper, SF, etc.
default>
Rubbing with PG1.2 is avoided
Envelopes
PG+ 2.35
Rubbing with PG1.2 and 1.7 is avoided
PG++ 4.2 CD-R printing
 Things to be used

Thickness gauge: 1.15 mm (x2)
1.3 mm (x2)

Phillips screwdriver
ADJUSTMENT
C A U T I O N
C H E C K
P O I N T
Sequence
Application
Cleaning
CR measurement,
VH detection
CR home position
seek
At ink replacement
PG Adjustment

The thickness gauge to be used must be free from dust and dirt
and from deformation. Be sure to clean it before use.

Take care that the Printhead is not soiled or scratched.

To ensure high accuracy of adjustment, install new ink
cartridges in the carriage, and move the carriage right and left
by pulling the belt without holding the carriage.

Make this adjustment after installing the mechanism unit in the
Lower Housing. (Install the Linear Scale after adjustment.)
Refer to "4.4.3 Printer Mechanism" (p.88)

With Epson Stylus Photo PX650/TX650/TX659/PX660, four
stages of PG setting are available by means of the APG
Mechanism. However, make this adjustment with the
mechanism in the minimum PG position (PG-: 1.2 mm).
(Refer to "4.4.8 APG Unit" (p.95)
Locating hole
Locating hole
Figure 5-8. PG Position at PG Adjustment
Revision C
and below.)
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