Paper Handling Mechanism; Release Lever - Epson 2070 - LQ B/W Dot-matrix Printer Service Manual

Operation Principles
2.1.4. Paper Handling Mechanisms
During normal operation, paper is fed into the printer, advanced to the specified position, and then ejected
from the printer. These paper-handling operations are performed by various paper handling mechanisms, such
as tractors, platens, rollers, and gears. This section describes the printer's paper handling mechanisms.

2.1.4.1. Release Lever

The release lever is used to select friction for rear/front tractor feed or to release the paper for pull tractor
feed. Changing the release lever position moves the paper guide rollers, and the new lever position is
detected by 2 release switch sensors (RLSW1 and RLSW2). See the following table. The RLSW1 sensor is
located on the left side frame and the RLSW2 sensor is located on the inside of the right sub frame. Refer to
Figure 2-4.
Release Lever
Position
Friction mode
Rear push tractor
mode
Front push tractor
mode
Pull tractor mode
Platen
Re lea se SW1
2-4
Table 2-3. Release Lever Position
Status of Paper Guide Rollers
The paper guide rollers are
pressed against the platen
The paper guide rollers are
separated from the platen
The paper guide rollers are
separated from the platen
The paper guide rollers and the
rollers for the lower paper guide
are separated from each other.
Left Frame
Figure 2-4 Release Switch
LQ-2070 Servcie Manual
RLSW1
Open
Closed
Closed
Closed
Tractor Clutch Cam
Open
Close
RLSW2
Open
Open
Open
Closed
Lelease SW2
Right Sub Fram
Rev.A