Adjustments; Overview; Mechanical Adjustments; Parallelism Adjustment - Epson Stylus Photo 870 Service Manual

EPSON Stylus Photo 870/1270

5.1 Overview

After you remove or replace parts in the Stylus Photo 870/1270, you
need to make certain adjustments, as described below. When making
more than one adjustment, perform them in the order as listed.
NOTE: Some of the adjustments require using the adjustment
program. See "Using the Adjustment Program"
page 73.
Table 5-1. When to Make Adjustments
Type of repair
1. "Head Angular Adjustment"
Printhead removal
2. "Bi-Directional Adjustment"
1. "Head Voltage ID Input"
Printhead replacement
1. "Initial Ink Charge"
2. "Head Angular Adjustment"
3. "Bi-Directional Adjustment"
1. "Head Voltage ID Input"
Main board replacement
2. "Bi-Directional Adjustment"
3. "USB ID Check/Input"
1. "Parallelism Adjustment" on this page
Carriage (or carriage guide
shaft) replacement or 2. "Head Angular Adjustment"
removal
3. "Bi-Directional Adjustment"
Carriage motor "Bi-Directional Adjustment"
replacement
Replacement or removal of "Paper Feed Motor Backlash Adjustment"
the following parts:
• Paper feed motor
• Gear 76
• Paper feed roller
on
Required adjustment
on page 76
on page 77
on page 75
on page 81
on page 76
on page 77
on page 75
on page 77
on page 79
on page 76
on page 77
on page 77
on page 72

5.2 Mechanical Adjustments

To perform the Parallelism Adjustment, you need a 1.14 mm thickness
gauge. You may also want to use a magnifying glass for the backlash
adjustment.

5.2.1 Parallelism Adjustment

The platen gap (parallelism) adjustment ensures that the printhead
remains the proper distance from the paper. Make the adjustment
when:
! You've loosened or adjusted a parallelism adjustment bushing
! You've removed or replaced the carriage assembly or carriage
guide shaft
"
Avoid scratching the coated surface of the paper feed
C A U T I O N
roller.
"
Make sure the ink cartridges are installed when you
perform this adjustment.
"
Do not use a bent thickness gauge, or it could damage
the printhead. Before performing the adjustment, clean
the thickness gauge with alcohol to remove any dirt or
grease.
1. Remove the upper case as described in
Case" on page 40.
2. Release the carriage lock lever, and slide the carriage by hand to
the center of the printer.
C A U T I O N
In the following steps, move the carriage only by pulling
on the carriage timing belt. Don't hold onto the carriage
while moving it, or the adjustment won't be accurate.
Chapter 5 Adjustments
"Removing the Upper
70