LQ SERVICE MANUAL. EPSON NOTICE • • • • All right reserved. Reproduction of any part of this manual in any form wharsoever without SEIKO. EPSON TERMINAL PRINTER. LQ SERVICE MANUAL detected, SEIKO EPSON would greatly appreciate being informed of them. Epson LQ – Printer – Service Manual — Free Service Manuals.

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The contents of this manual are subject to change without notice. All efforts have been made to ensure the accuracy of the contents of this manual. Includes a step-by-step guide for product disassembly and assembly. Chapter 4 Includes a step-by step guide for addjustement.

Chapter 5 Provides Epson-approved techniques for troubleshooting. Chapter 6 Describes prevetive maintenance techniques. List of Tables Table Items Included with the Printer The LQ is a 24pin serial impact dot-matrix printer suitable for the VAR value addedreseller market.

The major features of this printer are: Number of pins 12x 2 staggered. Paper thickness lever indicated in the following table. Set the Load paper from the front or rear entrance.

Remove the paper eject assembly and attach the pull tractor unit.

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Remove any slack in the paper between the platen and pull tractor. The table b;low defines the abbreviations used in the figure. PW width Refer to Table Refer to Table Printable area Each abbreviation is defined in the following table.

PL length Refer to Table Roll paper is not available in all models, and not available in the U. The following table shows specifications for roll paper.

These interfaces are selected manually in default setting mode or selected automatically. Printer is on line not in the pause state. Printer status No PE sensor detects that paper is loaded. The release lever position is set to continuous paper. Printer status The front PE sensor detects that paper is loaded in the front paper path.

Pause button pressed Printer performs a line feed. However, in cases where print data is over the paper width, the image cut function does not operate in all modes. LQ Service Manual Product Description Operations at power on Turning the printer on while pressing panel buttons executes the functions below: Pitch Some default printer settings can be changed in this operation.

The method for setting defaults is described in the instruction sheets, which are printed out immediately after you enter the mode. In this mode, you can adjust the bidirectional alignment for the following three modes: Draft mode Draft copy mode 3.

Housing Assembly This consists of printer cover assembly, edge guide assembly, upper housing, lower housing assembly, etc. List of Figures Figure Principles of Printhead Operation The printhead is an pin 12 pins 2 head for impact dot printing. The CR motor drives the timing belt.


The carriage assembly is connected to the timing belt, which is moved by the CR motor. When you move the platen gap adjust lever forward or backward, the carriage guide shaft rotates. 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. Paper Advance Mechanism This section describes how the friction and tractor advance mechanisms work to move the paper through the printer.

Friction Advance Method Paper is held between the platen and the paper guide rollers and between the paper tension roller and paper tension unit cover. Push Tractor Method The push tractor method can be used with either the rear or front entrance.

When the push tractor method is used with the rear entrance, the torque generated by the PF motor is transmitted to the push tractor gear through the PF motor pinion gear, paper advance reduction gear, and tractor reduction gear. Pull Tractor Method The pull tractor advances paper in basically the same way as the push tractor. The push tractor is installed at the paper entrance and pushes paper into the printer. On the other hand, the pull tractor is installed at the paper exit and pulls paper out of the printer mechanism.

Push-Pull Tractor Method The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors advance the paper: They operate simultaneously to push and pull the paper through the printer mechanism. These paper paths are divided into four groups, depending on which entrance top, rear, bottom, or front is used to feed paper. The printer has two PE paper end sensors.

Rear Entrance Figures, and show the paper paths for tractor feeding using the rear entrance. You can use the rear entrance with any of the following paper feed methods: LQ Service Manual Operating Principles As shown above in Figurewhen you use the pull tractor with this printer, you must remove the paper eject cover, which includes the paper tension roller, from the printer mechanism. Bottom Entrance Figure shows the paper path for tractor feeding using the bottom entrance. Front Entrance Figures through show the paper paths for the front entrance.

The front entrance can be used with any of the following paper feed methods: When the carriage moves from left to right and vice versa on the CR guide shaft, the timing belt turns the belt-driven pulley. These boards are the same as the FX The power supply circuit has several protection and control circuits.

This section describes these circuits. LQ Service Manual Operating Principles The following figure shows the data flow from the host computer to the printhead.

Data sent from the host computer is converted to image data and transmitted to the printhead through the gate array. Screw Types and Abbreviations Flowchart for Disassembling the Printer Removing the Gear Train Cover Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from the AC power socket.


When the procedure for installing a component is simply the reverse of removing the component, this chapter does not describe the assembly procedure. Before Starting Disassembly Procedures 1.

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Remove the following parts: Release the left clips for the panel board assembly by pushing them from the cutout located on the inside front of the upper housing assembly.

Removing the Printhead Remove the printer cover and ribbon cartridge see Section 3. Remove the printhead from the CR assembly. Disconnect the connector cable for the HP sensor. Remove the HP sensor by pushing up and releasing the 2 clips epzon the bottom of the HP sensor from the front paper entrance.

LQ Service Manual Disassembly and Assembly Mount the onto the ribbon mask holder groove, aligning the bottom line of micro PW sensor assembly photo sensor to the bottom line of the groove. Srrvice you remove the PW sensor assembly, clean serrvice surface of the sensor by wiping it with a soft material. Release both locks for the left and right bushings 8 mm by pushing the lever holder for the bushings manua, and then pulling the holder lever forward.

Remove the panel board assembly see Section 3. Remove the panel board see Section 3. Remove the 2 CR mounting screws securing the CR motor assembly. Remove the printer mechanism see Section 3. Remove the following 11 parts from the right frame assembly. Disassembly and Assembly LQ Service Manual When you engage the release lever and release lever transmission to the tractor clutch cam, notice the points in the srevice figure. Take up the timing belt slack between the two slots completely, as shown in the following lw.

Insert the 2 oil pads into the proper positions in the CR assembly, as shown. Disassembly and Assembly of CSF Bin 1 This section describes procedures for disassembling and assembling the optional cut sheet feeder. In general, you can install a component in the CSF simply by reversing the procedure for removing it.

Therefore, this section does not describe assembly procedures in most cases. Align those cables as shown in the following figure.

If these cables is not aligned properly, the CSF gear cover cannot be assembled properly. Refer to step 1 in Section 3. Remove the stepping motor.

Refer to steps 2 and 3 in the Section 3. Remove the E-ring fixing the right edge of the paper feed shaft.