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Epson ActionPrinter 3000, Service Manual

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Epson ActionPrinter 3000 Service Manual Download Page 81

Principles of Operation

Table 2-4. Current Values for Reference Voltages

Positive feedback through R9 generates a hysteresis in the comparator of ICl.

The upper limit of the hysteresis is the reference voltage. The comparator works

like a Schmitt trigger, sensing a difference when the inverse terminal feedback is

slightly larger or smaller than the hysteresis level. The comparator in ICl

compares reference voltage   and the feedback voltage.

When reference voltage   is HIGH, TR6 goes on and applies approximately

25 VDC to the coil. The current rises linearly due to inductance. TR6 goes off

when the feedback voltage equals the reference voltage. In this way, an almost

constant current is applied to the coil.

Figure 2-36 shows the carriage motor’s drive current waveform (pin 12) and the

chopping waveform (pin 17) of the drive voltage (+24 v) at 960 pps. Figure 2-37

shows the Schmitt trigger circuit.

Figure 2-36. Chopping Waveforms

LQ200/AP3000

2-37

Summary of Contents for ActionPrinter 3000

Page 1: ...EPSON LQ 200 ActionPrinterTM 3000 Service Manual Revision Level I Printed on recycled paper ...

Page 2: ... from that to which the receiver is connected l Consult the dealer or an experienced radio TV technician for help CAUTION The connection of a nonshielded equipment interface cable to this equipment will invalidate the FCC Certification of this device and may cause interference levels that exceed the limits established by the FCC for this equipment It is the responsibility of the user to obtain and...

Page 3: ...g or otherwise without the prior written permission of Epson America Inc No patent liability is assumed with respect to use of the information contained herein While every precaution has been taken in the preparation of this publication Epson America assumes no responsibility for errors or omissions Neither is any liability assumed for damages resulting from the use of the information contained he...

Page 4: ...Head Adjust Lever 1 28 Printhead Protection During Heavy Duty Printing 1 29 Main Components l 29 CO64 MAIN PCB l 30 Control Panel PCB l 30 PEBFIL II PCB 1 31 Transformer 1 31 Model 5ClO Printer Mechanism 1 32 Housing 1 33 Chapter 2 Principles of Operation Overview 2 l Connector Summary 2 l Overview of Printer Mechanism Operation 2 3 Circuit Overview 2 7 Firmware Overview 2 8 Principles of Operatio...

Page 5: ...g the Printer Mechanism 3 19 Chapter 4 Adjustment Adjustment Overview 4 1 Adjusting the Platen Gap 4 1 Adjusting the Bidirectional Printing Alignment 4 4 VRl and VR2 Specifications 4 5 Adjustment Procedures 4 6 Chapter 5 Troubleshooting Procedure for Troubleshooting the Printer 5 1 Unit Replacement 5 1 Repair of the Main Board 5 10 Repair of the Printer Mechanism 5 17 Chapter 6 Maintenance Prevent...

Page 6: ...ne Drawings A 12 Subsequent product modifications will be brought to your attention via Service Bulletins Please revise the text as bulletins are received This document is subject to change without notice Note This manual uses minus signs in front of signals to indicate that they are active LOW signals LQ200 AP3000 vii ...

Page 7: ...ad Protection During Heavy Duty Printing 1 29 Main Components 1 29 C064 MAIN PCB 1 30 Control Panel PCB 1 30 PEBFIL II PCB 1 31 Transformer 1 31 Model 5C10 Printer Mechanism 1 32 Housing 1 33 Figures Figure l l Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 7 Figure 1 8 Figure 1 9 Figure 1 10 Figure 1 11 Figure 1 12 Figure 1 13 Figure 1 14 LQ 200 AP3000 1 2 Pin Configuration 1 3 P...

Page 8: ...s for Single Sheet Paper 1 4 Specifications for Continuous Paper 1 4 Specifications for Labels 1 4 Built In Fonts 1 9 Printing Modes 1 11 Character Matrix and Character Size 1 12 Connector Pin Assignments and Signal Functions 1 15 Handshaking DCl DC3 Protocol 1 17 DIP Switch Set 1 1 18 DIP Switch Set 2 1 18 International Character Set and Character Table Selection 1 19 Font Selection 1 19 Page Len...

Page 9: ...raft 10 cpi 64 cps letter quality 12 cpi 53 cps letter quality 10 cpi Clear easy to read printing with standard Epson fonts Seven built in letter quality LQ fonts Roman Sans Serif Courier Prestige Script OCR B and Orator Direct built in font selection using control panel buttons Automatic loading for single sheet paper Two paper slots rear and bottom Easy handling of single sheet paper with the op...

Page 10: ...cription Table l l lists the optional units available for the printer and Figure l l shows the printer Table 1 1 Optional Units Model Description 7341 Cut sheet feeder CSF 1 2 Figure 1 1 LQ 200 AP300 LQ 2OO AP3000 ...

Page 11: ...n 24 wires 12 x 2 staggered diameter 0 008 inches 0 2 mm Figure 1 2 Pin Configuration Feeding Methods Friction feed tractor feed Line Spacing 1 6 inch or programmable in units of 1 180 inch Paper Insertion From rear or bottom Paper Feed Speed 100 ms line at 1 6 inch line feed 2 2 inches per second continuous feed Paper Specifications See Tables 1 2 1 3 and 1 4 LQ 200 AP3000 1 3 ...

Page 12: ...General Description Table 1 2 Specifications for Single Sheet Paper Table 1 3 Specifications for Continuous Paper Table 1 4 Specifications for Labels 1 4 LQ 2OO AP3O00 ...

Page 13: ...ch 257 mm wide paper The lowest print position 0 54 inches or 13 5 mm is only for reference Printing is possible approximately 1 48 inches 37 mm from the bottom edge of the paper when you press the AUTO LOAD button to load a single sheet Paper feeding accuracy is not assured within 0 88 inches 22 mm from the top edge of the paper and 1 20 inches 30 mm from the bottom edge of the paper LQ 200 AP300...

Page 14: ... inches 13 mm or more using 4 0 to 9 5 inch 101 to 242 mm wide paper 1 04 inches 26 mm or more using 10 0 inch 254 mm wide paper 2 0 52 inches 13 mm or more using 4 0 to 9 5 inch 101 to 242 mm wide paper 1 04 inches 26 mm or more using 10 0 inch 254 mm wide paper 1 6 LQ 2OO AP3000 ...

Page 15: ...1 72 inches width x 1 36 inches height of Ribbon x 2 88 inches depth Cartridge 293 mm x 34 mm x 72 mm Reliability Mean Cycles Between Failure MCBF 3 million lines excluding printhead Mean Time Between Failure MTBF 40000 power on hours POH at 25 duty Printhead Life 200 million strokes black ribbon 100 million strokes film ribbon Safety Approvals Safety standards UL478 Radio Frequency Interference R...

Page 16: ...gth between AC line and chassis Environmental Conditions Temperature 41 to 95 F 5O to 35OC operating 22O to 140 F 30 to 60 C in shipping container Humidity 10 to 80 RH operating 5 to 85 RH storage Resistance 1 G within 1 ms operating to Shock 2 G within 1 ms storage Resistance 0 25 G 55 Hz maximum operating to Vibration 0 50 G 55 Hz maximum storage Physical Specifications Weight Approximately 14 1...

Page 17: ... on you cannot define user defined characters Character Code 8 bits Character Sets 96 character ASCII character set 14 international character sets Legal character set PC character tables for the Personal Computer 437 850 860 863 865 Built In Fonts See Table 1 5 Table 1 5 Built h Fonts Notes l o resident I proportional LQ font specified using ESC k 2 15 cpi Courier l OCR B and Orator are basically...

Page 18: ...r quality printing l Character pitch 10 cpi 12 cpi 15 cpi or proportional printing l Condensed l Double width l Double height l Emphasized l Double strike l Italic l Underlined l Double underlined l Overscore l Strike through l Outline l Shadow Printing Speed See Table 1 6 Printing Columns See Table 1 6 Character Matrix See Table 1 7 Character Size See Table 1 7 1 10 LQ 200 AP3000 ...

Page 19: ...des Notes l Max is the value appropriate for the maximum width character l Min is the value appropriate for the minimum width character means that the printer automatically selects LQ mode when you select proportional pitch LQ 200 AP3000 1 11 ...

Page 20: ...m character This value depends on the paper the ribbon and other variables l Unit ESC SP indicates the minimum length to be added to the right of the character specified using ESC SP You can also send Unit Esc SP followed by the character string CHR h20 indicates that printer firmware reshapes the character matrix Character width is half of the noncondensed character width 1 12 LQ 2oo AP3000 ...

Page 21: ... Normal character General Description Figure 1 5 Character Matrix LG 200 AP3000 1 13 ...

Page 22: ...andard parallel interface Data Format Synchronization Handshaking Signal Level Adaptable Connector Data Transmission Timing 8 bit parallel STROBE signal BUSY and ACKNLG signal TTL compatible 57 30360 Amphenol or equivalent See Figure 1 6 1 14 Figure 1 6 Data Transmission Timing LQ 200 AP3000 ...

Page 23: ...General Description Table 1 8 shows the connector pin assignments and signal functions of the 8 bit parallel interface Table 1 8 Connector Pin Assignments and Signal Functions LQ 200 AP3000 1 15 ...

Page 24: ... conditions are based on TTL levels The rise and fall times of all signals must be less than 0 2 us You can set the AUTO FEED XT signal to LOW using DIP switch 2 4 You can set the SLCT IN signal to LOW using jumper 6 By setting the DATA 1 through 8 pins to the STROBE signal you can perform printing tests including interface circuit tests without using external equipment Minus signs are used in fro...

Page 25: ...ode data transmission continues 3 The DC1 and DC3 codes are enabled only when the SLCT IN signal pin number 36 is HIGH and the printer is initialized 4 If the SLCT IN signal is LOW when the printer is initialized DC1 DC3 handshaking is invalidated and the printer ignores the DC1 DC3 control codes 5 If the SLCT IN signal is HIGH when the printer is initialized the printer starts from the selected D...

Page 26: ...ge slot cover Tables 1 10 through 1 15 describe the functions of these DIP switches The printer reads the DIP switch settings only at power on or after receiving the INIT signal Table 1 10 Dip Switch Set 1 Notes l 1 When DIP switch 2 4 is on you cannot create user defined characters l 2 When DIP switch 2 5 is on you can select bidirectional graphics printing using ESC UO 1 18 ...

Page 27: ...General Description Table 1 12 International Character Set and Character Table Selection Table 1 13 Font Selection LQ 200 AP3000 1 19 ...

Page 28: ...Selection Jumpers Table 1 15 Character Pitch Selection Jumper 6 located underneath the cartridge slot cover is user selectable If you connect jumper 6 the SLCT IN signal is LOW and the printer ignores the DC1 DC3 control codes 1 20 LQ 200 AP3000 ...

Page 29: ...he two SelecType indicator lights match the desired font Self Test To run the self test in draft mode turn on the printer while pressing the LINE FEED button To run the self test in letter quality LQ mode turn on the printer while pressing the FORM FEED button To stop or start the self test press the ON LINE button To end the self test press the ON LINE button and then turn off the printer The fir...

Page 30: ... narrow carriage 24 pin dot matrix printer for home and small business combining excellent high resolution printing convenient paper handling and a new standard for economical printing LOOK AT WHAT THE LQ 200 CAN DO FOR YOU n Outstanding 24 pin print quality m Sharp180 x 360 DPI graphics w 192 CPS draft print SP ional cut sheet feeder 1 0 Drint mitaA Figure 1 8 Demonstration 1 22 LQ 200 AP3000 ...

Page 31: ...p mode turn on the printer while holding down the LINE FEED and FORM FEED buttons In hexadecimal dump mode the printer prints the hexadecimal representation of the input data and the corresponding ASCII characters If input data is a control code instead of a character code the printer prints a period in the ASCII column Figure 1 9 Hexadecimal Dump LQ 200 AP3000 1 23 ...

Page 32: ...listed below in dots per inch dpi including half dots 120 dpi at triple speed 180 dpi at double speed 240 dpi at one and a half speed 360 dpi at normal speed Tables 1 16 and 1 17 show how the firmware handles the print densities Table 1 16 Print Density Table 1 17 Bit Image Printing 1 24 LQ 2OO AP3000 ...

Page 33: ...erforms a paper loading operation with the cut sheet feeder enabled The printer outputs the following interface signals to indicate the error and halt data transmission The BUSY signal becomes HIGH The ERROR signal becomes LOW The printer does not send an ACKNLG pulse Buzzer Operation The buzzer rings when any of the following occurs l The printer receives the BEL code 0 5 second ring l The printe...

Page 34: ...dware initialization the printer 0 Initializes the printer mechanism l Clears the input data buffer l Clears the downloaded character set l Clears the print buffer a Returns its settings to the default values described on the next page Software initialization Software initialization takes place when the printer receives the software initialization code During software initialization the printer l ...

Page 35: ... 8 characters relative VFU Channel Channel 0 Typestyle SelecType setting software initialtiation DIP switch setting hardware initialization User Defined Characters Deselected software initialization Cleared hardware initialization Justification Left justification Character Spacing 10 cpi Bit Image Mode Assignment ESCK ESC O ESCL ESC l ESCY ESC 2 ESCZ ESC 3 Printing Effects Clears all effects excep...

Page 36: ...head adjust lever to the position appropriate for your paper s thickness See Table 1 18 and Figure 1 10 Table 1 18 Head Adjust Lever Note If the print density is light move the head adjust lever one step lower Figure 1 10 Head Adjust Lever 1 28 LQ 200 AP3000 ...

Page 37: ...ting stops When the power supply voltage increases to the required level the printer prints the rest of the line This protection occurs when half or more of the wires are activated simultaneously and continuously Main Components The main components are designed so that you can easily remove and replace them when you maintain or repair the printer The main components are 0 C064 MAIN PCB main contro...

Page 38: ...uit design of the main control board and controls all of the printer s main functions Figure 1 12 C064 Main PCB Control Panel PCB The control panel PCB is the control panel It includes the indicator LEDs the control panel buttons and the buzzer Figure 1 13 Control Panel PCB 1 30 LQ 200 AP3000 ...

Page 39: ...inter and from the printer to the outer line The fuse on this board prevents overheating Figure 1 14 PEBFiL II PCB Transformer The transformer converts the input AC from the filter circuit into 28 VAC output to supply the required voltage to the control circuit board Figure 1 15 Transformer LQ 200 AP3000 1 31 ...

Page 40: ...rinter mechanism is designed specifically for the LQ 200 AP3000 Its components include the carriage motor carriage mechanism paper feed motor paper feed mechanism ribbon feed mechanism printhead and sensors Figure 1 16 Model 5C10 Printer Mechanism 1 32 LQ 200 AP3000 ...

Page 41: ...ption Housing The housing consists of the upper and lower cases The upper case houses the control panel The lower case contains the printer mechanism and the main control board Figure 1 17 Housing LQ 200 AP3000 1 33 ...

Page 42: ...T signal input from CN1 2 26 ROM cartridge installation and removal 2 27 Address Decoder and Bank Register 2 29 Address decoder 2 29 Bank register 2 29 Carriage Operation 2 30 Carriage mechanism 2 30 Carriage motor drive circuit block diagram 2 31 Gate array E0lA05 in the carriage motor drive circuit 2 32 Carriage motor drive circuit 2 33 Carriage motor software control 2 38 Paper Feeding 2 43 Pap...

Page 43: ...tor Circuit 2 16 Oscillator Waveform 2 17 Constant Voltage Control Circuit 2 17 AMP1 Output Control 5 VDC 2 18 NJM2355 Internal Circuit 2 19 Output Transistor Drive Waveform 2 20 24 VDC Regulator Circuit 2 21 Constant Voltage Control 24 VDC 2 22 Over Current Protection 2 23 Vx Voltage Circuit 2 24 Reset Circuit 2 25 RESET Output 2 26 RESET Pulse Oscillation Process After ROM Cartridge Installation...

Page 44: ... Table 2 4 Table 2 5 Table 2 6 Table 2 7 Table 2 8 Table 2 9 Table 2 10 Board Connector Summary 2 1 Power Supply Applications 2 10 Reference Voltages 2 35 Current Values for Reference Voltages 2 37 Phase Excitation 2 38 Drive Sequence 2 2 Phase Excitation 2 39 Drive Sequence 1 2 Phase Excitation 2 39 Excitation Sequence Clockwise for Forward Paper Feeding 2 46 Scan Lines and DIP Switches 2 54 Ribb...

Page 45: ...ing the printer mechanism the power supply circuits and the control circuits This chapter also describes how the printer s circuitry and the printer mechanism operate Connector Summary Figure 2 1 shows how the primary components are connected Table 2 1 lists and describes the connectors Table 2 1 Board Connector Summary LQ 200 AP3000 2 1 ...

Page 46: ...Principles of Operation Figure 2 1 Cable Connections Note CR carriage PF paper feed HP home position 2 2 LQ 200 AP3000 ...

Page 47: ...al impact dot matrix printer mechanism that prints at 180 dots per inch dpi in both the horizontal and vertical directions Figure 2 2 is a block diagram of the printer mechanism Figure 2 2 Printer Mechanism Block Diagram Note cw clockwise CCW counterclockwise HP home position PE paper end LQ 200 AP3000 2 3 ...

Page 48: ...P sensor l Thermal sensor Paper end sensor The paper end sensor switch goes on when the paper runs out One switch detects when the paper is out for both the rear and bottom paper slots Figure 2 3 illustrates the paper end sensor Paper out t on LOW level Paper present off HIGH level Figure 2 3 Pap End Sensor 2 4 LQ 200 AP3000 ...

Page 49: ... sensor Home position on LOW level Other position off HIGH level Figure 2 4 Home Position Sensor Thermal sensor The thermal sensor in the printhead monitors the printhead s temperature If the temperature exceeds a predetermined upper limit the printer stops printing until the temperature drops to a predetermined value Then printing resumes Figure 2 5 illustrates the thermal sensor circuit Figure 2...

Page 50: ...loop system controls the carriage motor Paper feed motor A four phase 48 step motor feeds paper It advances the paper 1 180th of an inch for each step phase switch using 2 2 phase excitation The CPU controls the paper feed motor under an open loop configuration Printhead Figure 2 6 illustrates dot wire operation The head driving coil energizes and this drives the dot wire outward The dot wire stri...

Page 51: ...Principles of Operation Circuit Overview Figure 2 7 is a block diagram of the printer s circuitry Figure 2 7 Circuit Block Diagram Note CG character generator GA gate array LQ 200 AP3000 2 7 ...

Page 52: ...tion Firmware Overview The printer uses a µPD7810HG CPU with 64KB of address space Figure 2 8 shows a memory map of the address space Figure 2 8 Memory Map 64 KB Note CG character generator GA gate array 2 8 LQ 200 AP3000 ...

Page 53: ...upply circuit block diagram 120 VAC is applied through the filter circuit to the step down transformer which generates 26 VAC The 26 VAC is input to the power supply circuit on the main board The 26 VAC is converted into approximately 36 VDC via the full wave rectifier and smoothing circuit The 36 VDC is input to the regulator circuits which supply 24 and 5 VDC to the control circuit The 24 and 5 ...

Page 54: ...Principles of Operation Figure 2 9 Power Supply Circuit Block Diagram Table 2 2 Power Supply Applications 2 10 LQ 2OO AP3000 ...

Page 55: ...p Down Circuit Figure 2 10 shows the chopper type step down switching regulator circuit When the transistor is on voltage Vi is applied to coil L and capacitor C Load current I1 flows and electromagnetic energy Wl accumulates in choke coil L When the transistor goes off energy Wl is applied to the load via flywheel diode D Therefore output voltage Vo is the average value LQ 200 AP3000 2 11 ...

Page 56: ...Principles of Operation Thus Vo can be held constant by controlling Ton Figure 2 11 shows the step down timing Figure 2 11 Step Down Timing 2 12 LQ2OO AP3000 ...

Page 57: ...t The PEBFIL II board includes a fuse Fl The filter circuit attenuates external noise and inhibits the noise generated in the printer from propagating through the AC line Cl or C2 drains leakage current between the primary coil and the case Figure 2 12 shows the filter circuit Figure 2 12 PEBFIL II Filter Circuit Board 2 13 ...

Page 58: ...of Operation Transformer The 120 VAC that passes through the filter circuit is transformed into 26 VAC and supplied to the main board Figure 2 13 is a schematic drawing of the power transformer 2 14 LQ 200 AP3000 ...

Page 59: ...er s secondary coil Then smoothing capacitor C40 converts the 26 VAC into approximately 36 VDC The 24 and 5 VDC voltages are converted from this DC voltage The DC voltage is used as the power supply voltage for the switching regulator circuit at the next stage Figure 2 14 Rectifier and Smoothing Circuit LQ 200 AP3000 2 15 ...

Page 60: ...cuit is used for constant frequency pulse width modulation The rectifier and smoothing circuit employs an NJM2355 circuit configured as a chopper type switching regulator circuit Figure 2 15 illustrates the 5 VDC regulator circuit Figure2 15 5 KDC Regulator Circuit 2 16 LQ200 AP3000 ...

Page 61: ...rm AMP1 in the 5 VDC regulator circuit is an error amplifier that monitors the output voltage Figure 2 17 shows the constant voltage control circuit Pin 1 of the 5 VDC regulator circuit provides a 5 V reference output Vref Vref is applied to the negative terminal of AMP1 The error amplifier adjusts its output according to the voltages at its positive and negative input terminals This keeps the pos...

Page 62: ... at pin 5 over voltage pulse width modulation modulates the AMP1 output current and reduces the circuit s output voltage R108 and C35 compensate for phase lag in the error amplifier preventing abnormal oscillation The next section describes pulse width modulation Figure 2 18 AMP1 Output Control 5 KVC LQ 2OO AP3OOO ...

Page 63: ...rminal of PWM comparator 1 In circuit 2 the outputs from AMP2 and AMP3 flow into the negative terminal of PWM comparator 2 without wired OR The dead time control voltage is input to additional negative terminals of both comparators At the same time a saw tooth waveform from the oscillator is input to the positive terminals The saw tooth waveform causes the comparators to generate pulses as shown i...

Page 64: ...ol voltage controls the potential at the NJM2355 circuit when it is lower than the preset voltage or current value When it exceeds the preset voltage the error amplifier lowers it below the preset voltage Figure 2 20 Output Transistor Drive Waveform 2 20 LQ 200 AP3000 ...

Page 65: ...tion and employs the same oscillation circuit as the 5 VDC regulator circuit In the 24 VDC regulator circuit error amplifier AMP2 is used for over current control and AMP3 is used for constant voltage control Figure 2 21 shows the 24 VDC regulator circuit Figure 2 21 24 VDC Regulator Circuit LQ 200 AP3000 2 21 ...

Page 66: ...in Figure 2 22 the output voltage is Rl14 R115 2 4z Jhms 9 1 K ohms 2 4K ohms 23 96 V Figure 2 22 Constant Voltage Control 24 KDC AMP 2 controls over current as follows 24 V is applied to the negative terminal The positive terminal receives an equal voltage when a negative current of the following value flows OutPit ylltage R 124 Rl27 24 11K ohms 560 ohms 0 22 ohms 5 55 A 2 22 LQ 200 AP3000 ...

Page 67: ...s this value over current protection goes on to reduce the output voltage Figure 2 23 illustrates over current protection Because pin 3 of IC1 is grounded dead time does not apply in this case Figure 2 23 Over Current Protection LQ200 AP3000 2 23 ...

Page 68: ...ge is extinguished The Vx voltage prevents abnormal operation when you turn the printer on or off When you turn the printer on or off l The Vx voltage circuitry is reset and does not drive the printer until the power supply stabilizes l Full ups for the printhead signal lines prevent printhead malfunctions l Pull ups for the paper feed motor signal lines prevent paper feed motor malfunctions Figur...

Page 69: ... 4B The RESET signal acts as a hardware initialization signal Figure 2 25 shows the reset circuit The reset circuit outputs the RESET signal when any of the following occur l You turn the printer on or off 0 The host interface or an optional interface inputs the INIT signal Figure 2 25 Reset Circuit LQ 200 AP3000 2 25 ...

Page 70: ...gate array resistor R69 and capacitor C26 The falling edge of the Vx voltage activates the RESET signal by discharging capacitor C26 via diode D14 Gate array pins 49 to 51 are used for waveform shaping Figure 2 26 RESET Output INIT signal input from CN1 The external INIT signal 50 psec or more passes through the low pass filter by R31 and C22 The signal is wave shaped within the gate array pin 47 ...

Page 71: ...l 2 outputs a RESET signal As the DISC terminal goes LOW capacitor C26 discharges at a time constant of R70 x C26 3 When the C26 discharge reduces the potential at the THLD terminal to the threshold voltage Vth the RESET signal is canceled 4 and the DISC terminal goes HIGH 5 After the DISC terminal goes HIGH the Vx voltage again discharges C31 at a time constant of R69 x C26 6 Figure 2 27 RESET Pu...

Page 72: ...f the gate array 6C receives a HIGH signal the DISC terminal outputs a LOW signal 1 and the Rout terminal outputs a RESET signal 2 The rest of the process is similar to what occurs after ROM cartridge installation See the description above Figure 2 28 RESET Pulse Oscillation Process After ROM Cartridge Removal 2 28 LQ 200 AP3000 ...

Page 73: ...C 4MCG 5C 1MCG 2C RAM 2C and HEAD gate array 7A via address lines AB12 through AB15 and bank lines 7 and 6 in the gate array The chip select for CS is generated with the RD signal and the chip select for the RAM is generated with the ALE signal Bank register The printer has a bank register in gate array E0lA05 6C The bank lines are set by writing to address F002H and can be checked by reading the ...

Page 74: ...t the carriage motor and the platen Figure 2 29 shows the carriage mechanism The timing belt is connected to the bottom of the carriage It is driven by the carriage motor and moved via the belt driven pulley The printhead is mounted on the carriage The entire unit moves right and left along the guide shaft and guide plate Figure 2 29 Carriage Mechanism 2 30 LQ 200 AP3000 ...

Page 75: ...le speed 1 5 speed normal speed 24 VI Holding 0 17 A f 20 Carriage motor drive circuit block diagram Figure 2 30 is a block diagram of the carriage motor drive circuit The CPU does not directly execute phase switching for the carriage motor Instead gate array 6C generates the phase switching based on CPU generated pulses The STK 6981B circuit stabilizes the drive current Figure 2 30 Carriage Motor...

Page 76: ...per motor The gate array first sets the excitation type 2 2 or 1 2 phase and rotation direction clockwise or counterclockwise When the CPU outputs a pulse to the gate array s TM terminal the gate array executes auto phase switching which drives the stepper motor Figure 2 31 shows this process Figure 2 31 Gate Array Operation 2 2 Phase Excitation 2 32 LQ 2OO AP3000 ...

Page 77: ...uit drives the stepper motor under a constant current An external voltage level determines the value of the current STK 6981B operation is divided into equivalent phases AB and CD This section describes phase CD Figure 2 32 shows the carriage motor drive circuit Figure 2 33 shows the STK 6981B circuit diagram F i g u r e 2 3 2 Carriage Motor Drive Circuit LQ2OO AP3000 2 33 ...

Page 78: ...Principles of Operation Figure 2 33 STK 6981B Circuit Diagram Note Phase AB is equivalent to phase CD which is shown in the figure above 2 34 LQ 200 AP3000 ...

Page 79: ...ltage generation circuit Figure 2 34 shows the reference voltage generation circuit Table 2 3 shows the reference voltages Figure 2 34 Reference Voltage Generation Circuit Table 2 3 Reference Voltages 1 L 1 H 1 0 736 V LQ 200 AP3000 2 35 ...

Page 80: ... to HIGH the input to the chopping circuit becomes 0 V and current is applied from the 5 V line to the motor via resistance Rl and diode Dl This current is given by the following equation Figure 2 35 shows the constant current control circuit Table 2 4 lists the current values for the reference voltages 2 36 Figure 2 35 Constant Current Control Circuit LQ 200 AP3000 ...

Page 81: ...comparator in ICl compares reference voltage a and the feedback voltage When reference voltage Y is HIGH TR6 goes on and applies approximately 25 VDC to the coil The current rises linearly due to inductance TR6 goes off when the feedback voltage equals the reference voltage In this way an almost constant current is applied to the coil Figure 2 36 shows the carriage motor s drive current waveform p...

Page 82: ...ion describes the carriage motor software control Excitation type Firmware determines the excitation As shown in Table 2 5 the excitation is executed according to the carriage speed Tables 2 6 and 2 7 show the motor drive sequence for each excitation system Table 2 5 Phase Excitation 2 38 LQ 200 AP3000 ...

Page 83: ...Principles of Operation Table 2 6 Drive Sequence 2 2 Phase Excitation Table 2 7 Drive Sequence l 2 Phase Excitation 2 39 ...

Page 84: ...ction An open loop system controls the carriage motor and switches the phase according to the set speed The drive chopping current is switched at the carriage motor drive frequency Figure 2 38 shows the relationship between drive speeds and switching current values Figure 2 38 Chopping Current and Drive Speed 2 40 LQ 200 AP3ooo ...

Page 85: ... position seek function operates When power is first applied the printer executes 2 2 phase excitation for 20 or 30 ms regardless of the phase switch setting Meanwhile the printer checks the HOME signal to determine whether the starting position is 1 or 2 The carriage enters the home position only once during the initialization Figure 2 39 Home Position Seek LQ 200 AP3000 2 41 ...

Page 86: ...bnormal carriage operation The LQ 200 AP3000 does not have a print timing signal PTS sensor and cannot detect abnormal carriage operation Therefore an error does not occur if external forces hinder carriage movement An error occurs only if the printer receives the HOME signal in the printing area If this occurs the carriage stops 2 42 LQ2OO AP3000 ...

Page 87: ...the spring force of the two paper feed rollers hold the paper against the platen To release the paper move the paper release lever forward Friction feeding The paper feed motor rotates the platen gear via the paper feed reduction gear in the direction shown in Figure 2 41 Friction from the platen and paper feed rollers feeds the paper in the direction shown in Figure 2 41 Figure 2 41 Friction Feed...

Page 88: ... the sprocket wheel The paper feed motor rotates the gears via the pinion on the shaft of the motor in the direction shown in Figure 2 42 The gear rotation causes the sprocket wheels to rotate and advances the paper in the direction shown in Figure 2 42 Figure 2 42 Sprocket Feeding 2 44 LQ 2OO AP3000 ...

Page 89: ...30 A typical Holding 0 06 A 5 20 mA Driving Frequency 400 pulses per second Paper feed motor drive circuit Figure 2 43 shows the paper feed motor drive circuit When the paper feed signal PB2 goes LOW Q27 goes on and supplies 24 V to the motor When the paper feed motor is not being driven when it is in hold status 5 V is supplied to the motor via resistor R36 and diode Dll Figure 2 43 Paper Feed Mo...

Page 90: ...ch for each step Table 2 8 shows the paper feed motor excitation system when the motor is driven clockwise for forward paper feeding Table 2 8 Excitation Sequence Clockwise for Forward Paper Feeding Note If the paper feed motor is driven counterclockwise it feeds paper backward Figure 2 44 shows the timing chart for acceleration and deceleration control 2 46 figure 2 44 Paper Feed Motor Drive Timi...

Page 91: ...ting plate is attracted to the iron core This drives the dot wire toward the platen The dot wire strikes the ribbon and the paper against the platen printing a dot When the head driving coil de energizes the actuating plate spring returns the plate to its initial position At the same time the impact of printing the dot and the effect of the wire resetting spring returns the dot wire to its initial...

Page 92: ...F 25O C Printhead drive circuit block diagram Gate array E05A02 is used as an 8 bit x 3 data latch By monitoring the printhead drive power 24 V line the CPU determines the pulse width for the head wire drive pulses from gate array E05A02 The CPU also monitors the printhead s temperature and suspends printing if the printhead overheats Figure 2 46 Printhead Drive Circuit Block Diagram 2 48 LQ 200 A...

Page 93: ...rpose gate array has special commands that lighten the CPU s load during printhead data output Figure 2 47 is a block diagram of gate array E05A02 Gate array operation centers around the three 8 bit data latches The gate array also supports functions commands that can efficiently write data to any of the data latch bits Figure 2 47 Gate Array E05A02 Block Diagram 2 49 ...

Page 94: ...ion Printhead drive circuit CPU port PC6 adjusts the drive pulse width The Vx voltage pulls up the output signals from the gate array to prevent printhead malfunctions Figure 2 48 Printhead Drive Circuit 2 50 LQ 200 AP3000 ...

Page 95: ...ad s solenoid drive frequency is 960 Hz The drive pulse width is adjusted using an A D converter to detect the drive voltage The drive pulse width is kept within the range indicated by the oblique lines in Figure 2 50 Figure 2 49 Print Timing Drive Voltage V Figure 2 50 Relationship Between the Head Driver Voltage and the Print Driving Pulse Width LQ 200 AP3000 2 51 ...

Page 96: ... printhead l Reads the initial DIP switch settings l Reads the bidirectional adjustment setting Shunt regulator TL431CLPB and resistors R37 and R55 regulate reference voltage Vref as follows Vref g R55 R37 4 5 V Note The shunt regulator s reference voltage is 2 5 V Using this value as a reference AN0 monitors the 24 V line AN1 monitors the printhead temperature and AN2 through AN7 read the DIP swi...

Page 97: ...Principles of Operation Figure 2 51 A D Converter Circuit LQ200 AP3000 2 53 ...

Page 98: ...Principles of Operation Table 2 9 shows the relationship between the scan lines and the DIP switches 2 54 LQ 2OO AP3000 ...

Page 99: ...C21 and then flow into the STRB terminal These pulses latch the parallel data and set the BUSY signal HIGH inhibiting subsequent data transfer The STROBE signal automatically outputs the gate array s PINT terminal to request a CPU interrupt When the CPU receives the interrupt request it reads the data latched in the gate array Figure 2 52 Host Interface LQ 200 AP3000 2 55 ...

Page 100: ...nterclockwise Table 2 10 Ribbon Feed Gear Train Figure 2 53 shows the ribbon feed mechanism The ink ribbon is an endless loop partly contained in the cartridge case It is held between the ribbon feed and ribbon pressure rollers mounted on the ribbon driving gear The gear s movement drives these rollers which in turn feed the ribbon To prevent ribbon slack a ribbon braking spring is attached at the...

Page 101: ...Principles of Operation Figure 2 53 Ribbon Feed Mechanism LQ 200 AP3000 2 57 ...

Page 102: ...he home position sensor 3 32 Disassembling the ribbon feed mechanism 3 33 Disassembling the tractor unit 3 34 Figures Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 Figure 3 14 Figure 3 15 Figure 3 16 Figure 3 17 Figure 3 18 Removing the Printhead 3 7 Removing the Upper Case 1 3 8 Removing the Upper...

Page 103: ...late 3 28 Carriage Guide Shaft and Head Adjust Lever 3 29 Removing the Carriage Motor Frame 3 30 Removing the Carriage Motor 3 31 Removing the Home Position Sensor 3 32 Removing the Ribbon Gear Cover 3 33 Removing a Side Cover 3 34 Removing the Sprocket Guide Shaft 3 35 Removing the Paper Guide Roller 3 36 Installing the Sprocket Wheels 3 37 Tables 3 ii LQ 200 AP3000 Table 3 1 Table 3 2 Table 3 3 ...

Page 104: ...e or assemble the printer l When you disassemble or assemble the printer wear gloves so that you do not cut your hands on the printer mechanism or the edge of a plate such as the ground plate CAUTION I The LQ 200 AP3000 uses plastic clips instead of screws to hold the printer mechanism some boards and other parts in place Be careful not to damage the plastic clips when you remove these parts LQ 2O...

Page 105: ...Disassembly and Assembly Tools Tables 3 1 and 3 2 list tools and measuring instruments you need when you disassemble assemble or repair the printer Table 3 1 Repair Tools 3 2 LQ 2OO AP3000 ...

Page 106: ... necessary lubrication adhesive application cleaning and maintenance procedures after you assemble and adjust the printer Chapter 4 describes adjustment procedures and Chapter 6 provides maintenance instructions Small Parts Table 3 3 lists the abbreviations this manual uses for small parts LQ 200 AP3000 3 3 ...

Page 107: ...Disassembly and Assembly Table 3 4 shows the screw shapes and names Table 3 4 Screw Shapes and Names 3 4 LQ 200 AP3000 ...

Page 108: ...e Checklist Before you deliver the printer check the table below to ensure that you repaired it properly The table is designed to help you maintain service quality standards Table 3 5 LQ 200 AP3000 Service Checklist LQ 2OO AP3000 3 5 ...

Page 109: ...ARNING Before you disassemble the printer read the section on general repair information at the beginning of this chapter CAUTION Remove the paper and the ribbon cartridge before you disassemble the printer This chapter divides printer disassembly into five main steps 1 Removing the printhead 2 Removing the case 3 Removing circuit boards 4 Removing the printer mechanism 5 Disassembling the printer...

Page 110: ...aper and the ribbon cartridge Then remove the printer cover 2 Unlock pull down the two levers that secure the printhead to the carriage Then lift up and remove the printhead Figure 3 1 Removing the Printhead 3 Disconnect the head cable from the connector on the printhead LQ 200 AP3000 3 7 ...

Page 111: ...panel Removing the upper case 1 Remove the printer cover and the paper guide 2 Remove the pull tractor assembly 3 Insert a standard screwdriver into each of the two holes at the front of the lower case and push to unlock each notch Then lift up the upper case Figure 3 2 Removing the Upper Case 1 3 8 LQ2OO AP3000 ...

Page 112: ...sembly 4 While lifting up the upper case disconnect the control panel s flexible flat cable FFC from connector CN4 on the CO64 MAIN board Then remove the upper case Figure 3 3 Removing the Upper Case 2 LQ 200 AP3000 3 9 ...

Page 113: ...pside down and push in the two notches that secure the control panel to the upper case Then remove the control panel from the upper case CAUTION When you install and remove the control panel be careful not to damage the FFC on the control panel with the FFC guide on the upper case Figure 3 4 Removing the Control Panel 3 10 LQ 2OO AP3000 ...

Page 114: ...nectors CN5 CN6 CN7 CN8 CN9 and CN10 on the C064 MAIN board These connectors connect the printer s main components to the CO64 MAIN board CAUTION To disconnect the connectors pull them out slowly and gently while holding the board Forcefully removing the connectors can damage the board Figure 3 5 Removing the C064 MAINBoard 3 Remove the two CBB P screws M3 x 10 that secure the C064 MAIN board to t...

Page 115: ...hem or damage any of the board s components Removing the PEBFIL II board 1 Remove the upper case as described earlier in this chapter 2 Disconnect connector CN1 on the PEBFIL II board CN1 connects the transformer to the PEBFIL II board 3 Remove the CB 0 M4 x 8 screw that secures the PEBFIL II board s ground terminal 4 Remove the CPS 0 M3 x 6 screw that secures the PEBFIL II board to the base plate...

Page 116: ... transformer to the PEBFIL II board Disconnect connector CNlO on the CO64 MAIN board CNlO connects the transformer to the CO64 MAIN board Remove the CB 0 M4 x 8 screw that secures the transformer ground terminal Remove the four CBB M4 x 12 screws and the CB 0 0 I4 x 8 screw that secure the transformer Then remove the transformer Figure 3 7 Removing the Transformer LQ 200 AP3000 3 13 ...

Page 117: ...r Mechanism This section describes how to remove the platen unit the paper guide and the printer mechanism You remove the platen unit and the paper guide to facilitate removing the printer mechanism Figure 3 8 Removing the Printer Mechanism 3 14 ...

Page 118: ...k under the paper feed motor at the right side of the platen unit Then remove the spring from the platen unit 3 Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 3 9 Then lift the platen unit to remove it Figure 3 9 Removing the Platen Unit 4 Disconnect the cable from connector CN9 on the C064 MAIN board LQ 2OO AP3000 3 15 ...

Page 119: ... printer Then remove the paper guide Notches Figure 3 10 Back of the Printer Mechanism Assembly Notes l Connect the end of the paper end sensor arm to the bottom paper end lever l To install the ground spring first attach it to the hook at the front and insert it into the platen shaft Then attach it to the hook near the paper feed motor 3 16 ...

Page 120: ...e as described in the preceding section Disconnect the cables from connectors CN5 CN6 CN7 and CN8 on the C064 MAIN board See Figure 3 5 Remove the CBB M3 x 6 screw on the right side of the printer mechanism that secures the bent portion of the ground plate Then remove the bent portion of the ground plate To loosen the six tabs on the lower case push each one with a screwdriver Loosen the tabs as d...

Page 121: ...Then lift the left side of the frame about a half inch 1 cm up from the lower case b Loosen tab 3 Then lift the frame s left side up another 2 inches 5 cm C Slide the printer mechanism in the direction indicated by the arrow in Figure 3 12 and remove it from tabs 4 and 5 Use tab 6 as a fulcrum Figure 3 12 Removing the Printer Mechanism 3 18 LQ 200 AP3000 ...

Page 122: ... this section see Figure A 7 the exploded diagram of the printer mechanism and Table A 2 the component list Removing the paper feed mechanism 1 Remove the printer mechanism as described earlier in this chapter 2 The paper release lever s notch is inside the frame Push the notch and remove the paper release lever Figure 3 13 Removing the Paper Release Lever LQ 200 AP3000 3 19 ...

Page 123: ...bly and Assembly 3 Push the paper feed roller shaft downward and slide it approximately an inch 2 cm to the left Then lift it up and remove it Figure 3 14 Removing the Paper Feed Roller Shaft 3 20 LQ 200 AP3000 ...

Page 124: ...sen the two tabs that secure the paper guide plate and the paper guide spacer to the frame Push the tabs out from the frame Then lift up and remove the paper guide plate and spacer Figure 3 15 Removing the Paper Guide Plate and Spacer LQ 2OO AP3000 3 21 ...

Page 125: ...Disassembly and Assembly Assembly Note Figure 3 16 shows the direction in which to install the paper guide plate and spacer Figure 3 16 Installing the Paper Guide Plate and Spacer 3 22 LQ 200 AP3000 ...

Page 126: ...connect the motor cable from the paper feed motor 3 Loosen the tab that secures the paper feed motor to the frame by pushing it in with a screwdriver To remove the paper feed motor rotate it in the direction shown by the arrow in Figure 3 17 Use point A as the fulcrum Figure 3 17 Removing the Paper Feed Motor LQ 2OO AP3000 3 23 ...

Page 127: ... shown by the arrow in Figure 3 18 Use point A as the fulcrum Notch Figure 3 18 Removing the Paper End Sensor Disassembling the platen unit 1 Remove the platen unit as described earlier in this chapter 2 Remove the left shaft holder and the paper feed knob from the platen unit 3 Pull out the ground spring and the platen gear at the right side of the platen unit 4 Remove the E ring from the platen ...

Page 128: ... that you install the flat spring and the shaft holder properly and that the gap between the platen and the platen gear is the correct size l When you attach the ground spring to the platen unit engage the long hook first and then the short hook Figure 3 19 Assembling the Platen Unit LQ 2OO AP3000 3 25 ...

Page 129: ...urn the printer mechanism upside down Then manually move the carriage unit to the cutout in the carriage motor frame Move the carriage unit until you see the carriage unit and the timing belt join through the cutout Figure 3 20 Bottom of the Printer Mechanism 4 Using round nose pliers detach the timing belt from the carriage unit Be careful not to damage the belt 3 26 LQ 2OO AP3000 ...

Page 130: ... through the plate cutout at B Figure 3 21 Removing the Carriage Guide Shaft Ground Plate 6 Turn the printer mechanism right side up Rotate the left carriage guide shaft lever fully counterclockwise and pull it out through cutout A Then turn the right carriage guide shaft lever fully clockwise and pull it out the same way Viewed from the Left Side Figure 3 22 Removing the Carriage Guide Shaft LQ 2...

Page 131: ...s the carriage guide plate to the frame Then slide the carriage guide plate to the left and remove it Figure 3 23 Removing the Carriage Guide Plate 8 Lift up and remove the carriage unit the carriage guide shaft and the head adjust lever 3 28 LQ2OO AP3000 ...

Page 132: ...ft and Head Adjust Lever l The left carriage guide shaft lever is gray and the right one is black For each lever slide the hole onto the corresponding shaft end l When you connect the head cable be sure to pass it through the FFC guide at the frame correctly Adjustment Required After you assemble the carriage unit adjust the platen gap as described in Chapter 4 LQ 200 AP3000 3 29 ...

Page 133: ...t Disconnect the motor cable from the carriage motor Disconnect the home position sensor s lead wire from the molded clip at the bottom of the frame See Figure 3 25 Loosen the four tabs that secure the carriage motor frame to the chassis frame Remove the carriage motor frame Figure 3 25 Removina the Carriage Motor Frame 3 30 LQ2OO AP3000 ...

Page 134: ...6 Removing the Carriage Motor 5 To remove the carriage motor move it in the direction indicated by the arrow in Figure 3 26 Assembly Notes Attach the E rings as follows l When you attach the ring to the left pulley shaft install it so that its opening faces left l When you attach the ring to the right pulley shaft install it so that its opening faces right After you attach the E rings use tweezers...

Page 135: ...e the carriage motor Came follow steps 1 through 3 of the preceding section on removing the carriage motor 2 Push in the notch on the home position sensor and remove the sensor from the carriage motor frame Figure 3 27 Removing the Home Position Sensor 3 32 LQ 200 AP3000 ...

Page 136: ...own Without removing the ribbon gear cover use a screwdriver to loosen the four bent tabs of the ribbon gear cover slightly Do not remove the ribbon gear cover while the printer mechanism is upside down because the gears will scatter Figure 3 28 Removing the Ribbon Gear Cover 3 Turn the printer mechanism right side up and remove the ribbon gear cover LQ 200 AP3000 3 33 ...

Page 137: ...Remove the side covers You can remove the left and right side covers at the same time Figure 3 29 Removing a Side Cover 2 Push open the two sprocket gear tabs and remove the sprocket shaft from the sprocket gear 3 Remove the sprocket transmission gear Then remove the sprocket mounting plate from the sprocket shaft 3 34 LQ 200 AP3000 ...

Page 138: ...Disassembly and Assembly 4 Use a screwdriver to loosen the sprocket mounting plate tab Then pull out the sprocket guide shaft Figure 3 30 Removing the Sprocket Guide Shaft LQ 200 AP3000 3 35 ...

Page 139: ...sprocket guide shaft The T shaped notch on the paper guide roller indicates the direction in which to move it along the sprocket shaft Assembly Note When you assemble the paper guide roller insert the sprocket shaft from the side with the T shaped notch Figure 3 31 Removing the Paper Guide Roller 3 36 LQ200 AP3000 ...

Page 140: ... the sprocket shaft move the roller in the same direction in which you removed it See Figure 3 32 Place the sprocket wheels on the sprocket shaft so that their markings are on the left Align the markings on the two wheels Figure 3 32 Installing the Sprocket Wheels LQ 200 AP3000 3 37 ...

Page 141: ... Figures Figure 4 1 Removing the Ribbon Mask 4 2 Figure 4 2 Adjusting the Platen Gap 4 3 Figure 4 3 Moving the Carriage Guide Shaft Lever 4 3 Figure 4 4 Platen Gap Adjustment Positions 4 4 Figure 4 5 Draft Mode Test Patterns 4 7 Figure 4 6 LQ Mode Test Patterns 4 9 Tables Table 4 1 VR1 Specifications 4 5 Table 4 2 VR2 Specifications 4 6 Table 4 3 Selecting the Best Aligned Test Pattern 4 8 LC 200 ...

Page 142: ...ce any parts Adjusting the Platen Gap If you rotated or assembled the carriage guide shaft or shaft levers or if printing is abnormal you need to adjust the gap between the platen and the printhead Follow these steps 1 Remove the printer mechanism as described in Chapter 3 2 Install the paper guide and the platen unit on the printer mechanism LQ 200 AP3000 4 1 ...

Page 143: ... toward the front of the printer and then lift it up Figure 4 1 Removing the Ribbon Mask 4 Reinstall the printhead 5 Move the head adjust lever to the second position and move the paper release lever to the tractor position 6 Manually move the carriage to column 10 4 2 LQ 200 AP3000 ...

Page 144: ...moothly while the 0 018 inch 0 45 mm gauge cannot pass at all Rotate the left carriage guide shaft lever clockwise to widen the platen gap or counterclockwise to close it Rotate the right carriage guide shaft lever counterclockwise to widen the platen gap or clockwise to close it Figure 4 2 Adjusting the Platen Gap Figure 4 3 Moving the Carriage Guide Shaft Lever LQ 200 AP3000 4 3 ...

Page 145: ...ositions match the adjustment is complete Figure 4 Platen Gap Adjustment Positions Adjusting the Bidirectional Printing Alignment If lines or characters are misaligned during bidirectional printing perform this adjustment Also perform this adjustment whenever you replace the CO64 MAIN board or the printer mechanism 4 4 LQ 2OO AP3000 ...

Page 146: ...AIN board to perform the bidirectional printing alignment adjustment Use VR1 in draft mode and VR2 in LQ mode Tables 4 1 and 4 2 show the specifications for VR1 and VR2 Misalignment usually occurs when the carriage moves from right to left Table 4 1 VR1 Specifications LQ 200 AP3000 4 5 ...

Page 147: ... at which the variable resistor stops when you turn it counterclockwise To adjust the alignment first move VR1 or VR2 to its standard position Then rotate VR1 or VR2 as described in the following sections l Select tractor feeding load continuous paper and install the ink ribbon 0 Move the head adjust lever to the second position 4 6 LQ 2OO AP3000 ...

Page 148: ...ure 4 5 Draft Mode Test Patterns 4 Select the best aligned pattern as described here 0 If the best aligned pattern is just above the middle pattern press the FORM FEED button once If it is the top pattern press the FORM FEED button twice See Table 4 3 l If the best aligned pattern is just below the middle pattern press the LINE FEED button once If it is the bottom pattern press the LINE FEED butto...

Page 149: ...tern If it is not satisfactory return to step 4 7 To set VR1 for the best aligned pattern turn VRl until the buzzer sounds 8 Turn off the printer LQ mode The LQ mode adjustment is similar to the draft mode adjustment described above 1 Turn on the printer while holding down the ON LINE FORM FEED and LINE FEED buttons 2 Press the ON LINE button 4 8 LQ 2OO AP3000 ...

Page 150: ... is the top pattern press the FORM FEED button twice See Table 4 3 0 If the best aligned pattern is just below the middle pattern press the LINE FEED button once If it is the bottom pattern press the LINE FEED button twice See Table 4 3 For example if the best aligned pattern is VR2 5 pattern 4 press the LINE FEED button once 5 Press the ON LINE button to print the pattern you select 6 Check the a...

Page 151: ... of the Main Board 5 10 Repair of the Printer Mechanism 5 17 Figures Figure 5 1 Troubleshooting Procedure 5 1 Figure 5 2 Printhead Resistance 5 6 Tables Table 5 1 Symptoms and Reference Pages 5 2 Table 5 2 Repair of the Main Board 5 10 Table 5 3 Repair of the Printer Mechanism 5 17 LQ 2OO AP3000 5 i ...

Page 152: ...r you can simplify this process by following the procedure outlined in the flowchart below Figure 5 1 Troubleshooting Procedure Unit Replacement For most problems it is sufficient for you to determine the difficulty to the unit level Refer to Table 5 1 determine what the problem is then follow the checks provided in the corresponding flowchart LQ 2OO AP3000 5 1 ...

Page 153: ...Table 5 1 Symptoms and Reference Pages 5 2 LQ 200 AP3000 ...

Page 154: ...Troubleshooting The Printer Does Not Operate when the Power Switch is Turned On LQ 2OO AP3000 5 3 ...

Page 155: ...Troubleshooting Abnormal Carriage Operation LQ 2OO AP3000 ...

Page 156: ...Troubleshooting Normal Carriage Operation but Incorrect Printing During Self Test LQ 2OO AP3000 5 5 ...

Page 157: ...Troubleshooting Figure 5 2 Printhead Resistance 5 6 LQ 200 AP3000 ...

Page 158: ...Abnormal Paper Feed but Normal Printing LQ200 AP3000 5 7 ...

Page 159: ...Troubleshooting Abnormal Operation of the Control Panel 5 8 LQ 200 AP3000 ...

Page 160: ...Troubleshooting Incorrect Printing in On line Mode Note It is assumed that the host computer is operating normally LQ 2OO AP3000 5 9 ...

Page 161: ...cribes various symptoms likely causes and checkpoints Checkpoints refer to proper waveforms resistance values and other values that should be checked to evaluate the operation of any potentially bad component Check these values and take the appropriate action Table 5 2 Repair of the Main Board 5 10 LQ 2OO AP3000 ...

Page 162: ...Table 5 2 Repair of the Main Board cont LQ 2OO AP3000 5 11 ...

Page 163: ...Table 5 2 Repair of the Main Board cont 5 12 LQ 200 AP3000 ...

Page 164: ...Table 5 2 Repair of the Main Board cont LQ 200 AP3000 5 13 ...

Page 165: ...Troubleshooting Table 5 2 Repair of the Main Board cont 5 14 LQ 200 P3000 ...

Page 166: ...Table 5 2 Repair of the Main Board cont LQ 200 AP3000 5 15 ...

Page 167: ...Troubleshooting Table 5 2 Repair of the Main Board cont 5 16 LQ 2OO AP3000 ...

Page 168: ...g or adjusting parts refer to Chapter 3 Disassembly and Reassembly and Chapter 4 Adjustment If a problem or system recurs after you have attempted to repair the printer refer to the tables above to find other potential causes Table 5 3 Repair of the Printer Mechanism LQ 200 AP3000 5 17 ...

Page 169: ...Troubleshooting Table 5 3 Repair of the Printer Mechanism cont 5 18 LQ 2OO AP3000 ...

Page 170: ...Troubleshooting Table 5 3 Repair of the Printer Mechanism cont LQ 2OO AP3000 5 19 ...

Page 171: ...ive Application 6 1 Figures Figure 6 1 Correct Adhesive Application 6 3 Figure 6 2 LQ 200 AP3000 Lubrication Points 6 4 Tables Table 6 1 Table 6 2 Table 6 3 Application of Lubricants and Adhesive 6 2 Lubrication Points 6 2 Adhesive Application Point 6 3 LQ 2OO AP3000 6 i ...

Page 172: ...oroethylene or ketone based solvents on the plastic components of the printer Lubrication and Adhesive Application Epson recommends that the printer be lubricated at the points illustrated in Figure 6 2 Table 6 2 lists each point along with its recommended lubricant The three recommended lubricants are Epson O 2 G 20 and G 26 all of which have been tested extensively and found to comply with the n...

Page 173: ...ance Table 6 1 Application of Lubricants and Adhesive E Epson exclusive product Table 6 2 Lubrication Points Refer to Figure 6 2 Note Lubrication must be applied during the reassembly process 6 2 LQ 200 AP3000 ...

Page 174: ...Table 6 3 Adhesive Application Point Refer to Figure 6 l Figure 6 1 Correct Adhesive Application LQ 200 AP3000 6 3 ...

Page 175: ...Maintenance Figure 6 2 LQ 200 AP3000 Lubrication Points 6 4 LQ 200 AP3000 ...

Page 176: ...ism Exploded Diagram A 9 Tractor Exploded Diagram A 10 LQ 200 AP3000 Case Outline Drawing A 12 LQ 200 AP3000 Case Outline Drawing with Tractor Unit A 13 Tables Table A 1 Table A 2 Table A 3 Table A 4 Table A 5 Table A 6 Table A 7 Table A 8 Table A 9 Table A 10 Board Connector Summary A 2 Part Number Reference Table A 11 Connector CN3 on the C064 MAIN Board A 14 Connector CN4 on the C064 MAIN Board...

Page 177: ... Appendix Connector Summary The figure below illustrates the interconnection of the primary components Table A l describes the function and size of the connectors Figure A l Cable Connections LQ 2OO AP3000 A l ...

Page 178: ...Appendix Table A l Board Connector Summary A 2 LQ 200 AP3000 ...

Page 179: ...Circuit Diagrams Figure A 2 C064 MAIN Board Circuit Diagram A 3 LQ 200 AP3000 ...

Page 180: ...Appendix Figure A 3 PEBFILL_II Board Circuit Diagram LQ 2OO AP3000 A 5 ...

Page 181: ...Appendix A 6 Figure A 4 Control Panel Circuit Diagram LQ 200 AP3000 ...

Page 182: ...Appendix Circuit Board Component Layout LQ 200 AP3000 Figure A 5 C064 MAlN Board Component Layout A 7 ...

Page 183: ...Appendix Exploded Diagrams Figure A 6 LQ 200 AP3000 Exploded Diagram LQ 200 AP3000 ...

Page 184: ...Appendix Figure A 7 M 5C1O Printer Mechanism Exploded Diagram LQ 200 AP3000 A 9 ...

Page 185: ...A p p e n d i x Figure AS Tractor Exploded Diagram A 10 LQ 200 AP3000 ...

Page 186: ...Table A 2 Part Number Reference Table Note ESG Epson standard gray A 11 ...

Page 187: ...Appendix Case Outline Drawings Figure A 9 LQ 200 AP3000 Case Outline Drawing A 12 LQ 2OO AP3000 ...

Page 188: ...Appendix Figure A 10 LQ 200 AP3000 Case Outline Drawing with Tractor Unit LQ 200 AP3000 A 13 ...

Page 189: ...Appendix Table A 3 Connector CN3 on the CM4 MAINBoard A 14 LQ 2OO AP3000 ...

Page 190: ...Appendix Table A 3 Connector CN3 on the C064 MAIN Board cont Table A 4 Connector CN4 on the C064 MAlN Board LQ 200 AP3000 A 15 ...

Page 191: ...Appendix Table AS Connector CN5 on the C064 MAINBoard A 16 LQ 200 AP3000 ...

Page 192: ...Appendix Table A 6 Connector CN6 on the C064 MAlN Board Table A 7 Connector CN7 on the C064 MAINBoard LQ 200 AP3000 A 17 ...

Page 193: ...Appendix Table A 7 Connector CN7 on the C064 MAlN Board cont Table A 8 Connector CN8 on the C064 MAINBoard Table A 9 Connector CN9 on the C064 MAIN Board A 18 LQ 2OO AP3000 ...

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