Tractor Mechanism; Manual Feed Mechanism; Platen Gap (Pg) Adjust Mechanism - Epson Stylus Color 1520 Service Manual

EPSON Stylus COLOR 1520

2.2.4.2 Tractor Mechanism

When the release lever is moved, the PF motor sends torque to the gears at the left end of the PF roller that
is transmitted to the tractor gears via the disengage mechanism. When the release lever is set to the tractor
side, the release sensor detects the position and torque from the ASF mechanism is disengaged.
Tractor Disengage Gear

2.2.4.3 Manual Feed Mechanism

The printer loads cut sheets and roll paper through the rear paper slot. While paper is detected by the rear
PE sensor, the CR unit is out of the ASF paper feeding position. Therefore, paper must be loaded manually,
even if there is paper in the ASF.

2.2.5 Platen Gap (PG) Adjust Mechanism

The PG adjust mechanism, at the top right of the printer mechanism, allows the user to set the proper platen
gap (distance between paper and nozzle surface) for the paper thickness to prevent ink from smudging. The
PG adjust mechanism consists of the PG adjust lever, CR guide shaft, and parallelism adjustment bushing.
The parallelism adjustment bushing joins the CR guide shaft, with an eccentricity toward the guide shaft.
Shifting the lever from "0" to "1" rotates the CR guide shaft away from or toward the platen, changing the
platen gap from wide to narrow or vice versa.
Paper Type
Cut Sheets, OHP Sheets,
Labels, Continuous paper
Envelopes, Cards, Index
cards
2-8
Release Lever
PF Roller
Figure 2-7. Tractor Mechanism
Table 2-6. Platen Adjust Lever Positions
Adjust Lever Position
Rear
Front
PF Motor
Rear PE Sensor
PF Motor Pinion Gear
Disengage Gear
PG Adjustment Value
+ 0.03 in (0.7 mm)
0