Epson 570e - LQ B/W Dot-matrix Printer- Manuals

i ’ CHAPTER 2 OPERATION PRINCIPLES 2.1 OVERVIEW OF PRINTER MECHANISM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.1 Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.3 CONTROL CIRCUIT OPERATION . . . . . . . . . . . . ....

REV.-A 2.1 OVERVIEW OF PRINTER { MECHANISM OPERATION This section describes the printer mechanism of the printer unit and explains how the printer works. has a printer mechanism that features a 24-pin dot for serial printing. There are four main parts to the printer mechanism: 1) the mechanism, 2) t...

REV.-A 2.3 CONTROL CIRCUIT OPERATION The control circuit consists of two boards: the MAIN board, which acts as the main board, and the PNL board, which acts as the control panel board. This section describes how these boards work. 2.3.1 Control Circuit Operation The printer CPU is an 8-bit CPU runni...

REV.-A Table 2-5 lists the functions of the main components and circuits of the printer. The CPU converts the print data sent from the host to image data (the print image). The image data is then loaded to RAM. Each line of data is processed sequentially. The CPU transfera the print data to the driv...

REV.-A Table 2-5. Functions of the Main and Circuits (Cont.) or Circuit PROM MROM(Mask ROM) HEAD GATE ARRAY Vref Circuit Location . . . Functions PROM contains the program that runs the CPU. Holds the CPU working area and the various buffers. (1E is not used for an column device and is not installed...

REV.-A Power Self V Line THLD I I u Figure 2-20. Signal Timing 2.3.3 Sensor Circuits Figure 2-21 shows block diagram. Detection of any excessive printheadtemperature causes the TEMP2 signal to be sent directly to the CPU. Other signals, such as the signal, pass through the each low path filters befo...

REV.-A 2.3.5 MOTOR, PF Drive Circuit The printer uses a stepping motor to advance the paper. The paper can be advanced for minimum of 1/380 inch. The is a 2-2 phase or 1-2 phase, constant-voltage drive type. to on the CPU are the phase ports forthe stepping motor. MOTOR, PF phase data output through...

REV.-A 2.3.6 Drive Circuit ‘\ Figure 2-24 shows the drive circuit block diagram. The print data already is expanded to create the image data. The CPU splits up this data three times and transfers this information to the latch circuit within the Head Gate The CPU samples the voltage of the V line via...

REV.-A CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3.2.1 Changing the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.2.3 Removing the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3.2.3.1 Removing the BOARD (C107 MAIN Board) . ....

REV.-A 3.2.3 Removing the Circuit Boards ) This section describes how to remove the BOARD MAIN board), the BOARD SUPPLY board) and the BOARD ASSY.,PANEL PNL board). 3.2.3.1 Removing the BOARD MAIN Board) 2. 3. 4. 5. 6. 7. Remove the HOUSING ASSY.,UPPER (see Section 3.2.2.2). Remove the X 6) screw th...

REV.-A 10) Screws CB BOARD MAIN Figure 3-7. BOARD Adjustment Required When replacing the BOARD you must adjust the bidirectional print position again to ensure bidirectional printing is aligned <Bidirectional Print position section 3.2.3,2 Removing the BOARD SUPPLY Board) 2.3.4. Remove the HOUSIN...

REV.-A 4.3 CIRCUIT ADJUSTMENT The MAIN board contains variable resistor which is used for balancing the circuitry. When any of the following parts are replaced, the circuitry must be balanced by adjusting the R6, R7, and If the circuitry is not properly adjusted, the CPU A/D converter functions abno...

) CHAPTER 5 TROUBLESHOOTING 5.2 REPAIR BY UNIT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8 5.4 REPAIR OF THE MAIN BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14 5.5 REP...

REV.-A # 2 0 # 4 0 # 8 0 o 0 0 0 0 0 0 o #3 o #5 o #7 o #9 o #11 o o #15 o #17 o o o ( Wire Assignment #122 82 Coil Resistance: 45.5 at 25*C (Between each dot wire and common.] ( Terminal Assignment Figure 5-2. Printhead Resistance 5-8

“) REV.-A 5.3 REPAIR OF THE MAIN BOARD This section provides instructions for repairing the main board when it is defective and describes symptoms, likely causes, and checkpoints. Checkpoints refer to proper waveforms, resistance values, and other values to be checked to evaluate the operation of an...

REV.-A 5.5 REPAIR OF THE PRINTER For detailed procedures for replacing or adjusting parts, refer to Chapter 3, and Chapter 4, If a problem or symptom recurs following an attempted repair, refer to Table 5-5 to try to find other potential causes. Table of the Printer Mechanism Problem Symptom Checkpo...

REV.-A A.1 CONNECTOR SUMMARY Figure A-1 illustrates the interconnection of the primary components. Table A-1 summarizes the functions and sizes of the connectors. Model 5J-10 PRINTER MECHANISM G A P L E V E R C R H O M E H E A D A A A t BOARD MAIN(C107 MAIN BOARD) A O p t i o n a lI n t e r f a c e ...

REV.-A A-1. Board Connector ‘\ Board Pins BOARD ASSY.,PANEL BOARD 12 BOARD ASSY.,POWER AC power input 2 SUPPLY DC power output 11 BOARD Parallel interface 36 (C107 MAIN BOARD) Optional interface card 36 Control panel 12 5 5 17 15 “ DETECTOR 2 DETECTOR 2 CN1O DETECTOR 2 CN11 DETECTOR 2 DETECTOR ASSY....

REV.-A , A.5 CASE OUTLINE DRAWING H-II 1- 434 m m ) A-17. Case Outline Drawing A-22