Epson FX 1170 - B/W Dot-matrix Printer Service Manual Download Page 63

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2.2.2 Power Supply Circuit Operation

Figure 2-22 shows the power supply circuitry in block diagram form. When AC power enters the printer from

an external power source, the filter circuit removes the noise. The AC voltage then undergoes full wave

rectification and is smoothed to produce direct current. The voltage is then fed through the switching circuit

and the secondary smoothing circuit to produce a stepped down +35

voltage. A +35

detector circuit

is connected to the switching circuit. This feedback control arrangement ensures a 35

voltage

supply.

A+5VDCvoltage is generated by feeding the +35 VDCvoltagethrough the

power supply circuit, where

the +35

is stepped down to a 5

voltage. The switching regulator IC containing the

control circuits performs this function. It controls the +5

line output.

The +5

voltage overload protection circuit cuts the +5

line output if the voltage e7

stops the operation of the switching circuit and then the output of +35

voltage.

line has a voltage overload protection circuit and a voltage drop protection circuit. The

voltage overload protection circuit cuts the +35

line output if the voltage e36

It stops the

operation of the switching circuit and then the output of the +35

voltage. The voltage drop protection

circuit protects the printer against a sudden voltage drop that maybe caused by a short circuit in the

circuitry of the +35

line. If a voltage drop is detected, it stops the operation of the switching circuit and

then the output of the +35

voltage.

An external switch is used to turn the printer power on or off. When the power switch is turned off, the

switching circuit is de-energized and the output of the +35

voltage is stopped. However, since the switch

is in the secondary circuitry, the current continues to flow in the primary circuitry as long as the printer remains

plugged into an external AC power source. For this reason, you must disconnect the printer from the external

AC power source. Unplug the power cable from the AC power outlet before you perform any maintenance

work.

2-20

Summary of Contents for FX 1170 - B/W Dot-matrix Printer

Page 1: ...EPSON EPSON TERMINAL PRINTER FX 870 1170 SERVICE MANUAL 4001461 REV A ...

Page 2: ...ject to change without notice All efforts have been made to ensure the accuracy of the contents of this manual However should any errors be detected SEIKO EPSON would greatly appreciate being informed of them The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof Copyright 1992 by SEIKO EPSON CORPORATION Nagano Japan i ...

Page 3: ...IS MANUAL DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE LISTED ON THE SERIAL NUMBER R...

Page 4: ...ers are organized as follows Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Provides a general product overview lists specifications and illustrates the main components of the printer Describes the theory of printer operation Includes a step by step guide for product disassembly and assembly Includes a step by step guide for adjustment Provides Epson approved techniques for troublesho...

Page 5: ... f REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT A June 15 1992 1st issue 7 v ...

Page 6: ...REV A TABLE OF CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 OPERATING PRINCIPLES CHAPTER 3 DISASSEMBLY AND ASSEMBLY CHAPTER 4 ADJUSTMENTS CHAPTER 5 TROUBLESHOOTING CHAPTER 6 MAINTENANCE APPENDIX vi ...

Page 7: ...s 1 13 1 2 2 1 Print Control 1 13 1 2 2 2 Input Data Buffer 1 14 1 3 Interface 1 15 1 3 1 Parallel Interface 1 15 1 3 2 Optional Interface 1 17 1 4 Control Panel 1 17 1 4 1 Components 1 17 1 4 2 Buttons 1 18 1 4 3 Indicators 1 19 1 5 Functions 1 20 1 5 1 Default Settings 1 20 1 5 2 Power On Default Settings 1 23 1 5 3 Buffer full Printing 1 23 1 5 4 Hexadecimal Dump 1 23 1 5 5 Self Test 1 24 1 5 6...

Page 8: ...heets 1 9 Figure 1 4 Printable Area for Continuous Paper 1 1o Figure 1 5 Printable Area for Roll Paper 1 11 Figure 1 6 Data Transmission Timing 1 15 figure 1 7 Control Panel 1 17 Figure 1 8 Hexadecimal Dump Printout 1 23 Figure 1 9 Self Test Printout 1 24 Figure 1 10 Lever Positions 1 26 Figure 1 11 Main Components 1 28 Figure 1 12 BOARD ASSEMBLY C094MAIN Main Control circuit Board 1 29 Figure 1 1...

Page 9: ... Table 1 8 Electrical Specifications for 120V Model 1 12 Table 1 9 Electrical Specifications for 220 240V Model 1 12 Table 1 10 Environmental Conditions 1 12 Table 1 11 Character Size and Pitch 1 14 Table 1 12 Printable Columns 1 14 Table 1 13 Print Speed 1 14 Table 1 14 Connector Pin Assignments and Signal Functions 1 15 Table 1 15 Optional Interface 1 17 Table 1 16 Group 1 Features 1 21 Table 1 ...

Page 10: ...r The standard tractor unit can be set to 3 positions 2 push and 1 pull Continuous paper can be used without removing the cut sheet feeder CSF Cut sheets 2 paths for insertion top optional front Auto loading 24K byte input buffer 16 character tables are supported for European model Italic pC437 850 860 863 865 437 Greek 851 869 852 853 857 855 866 GOST 861 6 character tables are supported for Non ...

Page 11: ...REV A 4 80 column model 136 column model Figure 1 1 External View of the FX 870 1170 r 1 2 ...

Page 12: ...eet feeder 136 column Plain cut sheet feeder 136 column Cut sheet feeder 80 column Cut sheet feeder 80 column Cut sheet feeder 136 column Cut sheet feeder 136 column Tractor unit 80 column Tractor unit 80 column Tractor unit 136 column Tractor unit 136 column Front sheet guide 80 column Front sheet guide 136 column Serial l F card Serial l F card 32KB intelligent serial l F card 32KB intelligent s...

Page 13: ... Pin Configuration 9 x 7 matrix high speed draft 9 x 9 matrix draft 18x 23 matrix NLQ 1 2 1 2 Paper Handling Feeding method Fanfold Cut sheet Envelope Label Roll Line spacing Friction feed front top Push tractor feed frontfrear Pull tractor feed front rear bottom Push pull tractor feed front rear Tractor feed Friction feed Friction feed Tractor feed Friction feed 1 6 1 8 or programmable min 1 216 ...

Page 14: ...se continuous paper Do not perform any reverse paper feeds within the top 8 5 m m area and bottom 22 mm area Do not perform reverse feeds greater than 1 6 after the paper end has been detected Use the paper tension unit Insert the multi part cut sheet forms only from the front 2 Push tractor feed Set the release lever to the REAR PUSH FRONT PUSH position Load the paper from the rear or front entra...

Page 15: ... between the platen and the pull tractor s Precisely adjust the horizontal position of the pull tractor and push tractor Multi part paper must be carbonless Do not perform reverse feeds greater than 1 6 Do not perform reverse feeds after the paper end has been detected 1 2 1 3 Paper Specifications See Tables 1 2 1 3 1 4 1 5 1 6 and 1 7 Recycled paper envelopes and labels require the following envi...

Page 16: ... 14 22 lb 45 70 kg 52 3 82 g m2 single sheet 12 15 lb 34 50 kg 40 58 2 g m2 each Plain or carbonless duplicating paper Recycled paper in normal environment with push tractor and optional pull tractor 4 sheets 1 original 3 copies maximum Table 1 5 Specifications for Envelopes Size No 6 166 mm x 92 mm No 10 240 mm x 104 mm Thickness 0 16 0 52 mm 0 0063 0 0197 Differences in thickness within the prin...

Page 17: ...LABELS 3 Labels should be used with the pull tractor front bottom or with the front push tractor 4 Do not perform reverse feed at any time including by hand z 5 Remove labels from the paper path when not in use i 3 Table 1 7 Specifications for Roll Paper Size Thickness Weight Quality 216 3 mm 8 5 0 12 0 07 0 09 mm 0 0028 0 0035 14 22 lb 45 70 Kg 52 3 82 g m2 Plain paper Note Roll paper isavailable...

Page 18: ..._ WXYZ 1 WXYZ Figure 1 3 Printable Area for Cut Sheets 1 3 0 mm 0 1 2 or more when the paper width is less than 364 mm 14 3 25 mm 0 9 or more when the paper width is 420 mm 16 5 136 column 3 0 mm 0 12 or more 80 column Note Paper feed accuracy cannot be assured within 24 mm 0 94 from the bottom edge of the paper top insertion Paper feed accuracy cannot be assured within 48 5 mm 1 9 from the bottom...

Page 19: ...r Continuous Paper 1 13 mm 0 51 or more when the paper width is 101 mm to 241 mm 4 to 9 5 25 mm 1 0 or more when the paper width is 254 mm 10 1 80 columns 13 mm 0 51 or more when the paper width is 101 mm to 377 8 mm 4 to 14 87 25 mm or more when the paper width is 381 mm to 406 mm 15 to 16 136 columns 1 1o ...

Page 20: ...o 0 0 0 0 0 0 0 0 0 1 3 0 Note 1 2 1 5 Figure 1 5 Printable Area for Roll Paper mm 0 1 2 or more Paper feed accuracy cannot be assured within 24 mm 0 94 from the bottom edge of the paper top insertion only Ribbon Cartridge Ribbon Cartridge type same as FX series Color Life of ribbon 8750 8755 M 8758 Subcartridge Black 3 x 106 characters at 80 column model 136 column model 14 dots character 1 11 ...

Page 21: ...220 240 VAC Input voltage range 198 264 VAC Rated frequency range 50 60 Hz Input frequency range 49 5 60 5 Hz Rated current 0 9 A Power consumption Approx 45 W 80 columns Approx 45 W 136 columns Self test in draft mode 10 cpi Dielectric strength 1 5 kVAC 1 second Between AC line and chassis 1 2 1 7 Environmental Conditions Table 1 10 Environmental Conditions Temperature 5 to 35 deg C 41 to 95 deg ...

Page 22: ... model R F I FCC class B U S A model VDE0871 Self certification EUR model 1 2 2 Firmware Specifications 1 2 2 1 Print Control Printing direction Text mode Bidirectional printing with logic seeking Unidirectional printing can be specified by software Bit image mode Unidirectional printing Character sets ASCII characters ESC P mode International characters 13 countries and their italics PC 437 850 8...

Page 23: ... speed draft I 380 320 1421 I t Draft pica 285 142 1 Draft elite 342 170 Condensed draft pica 243 122 Emphasized draft pica 142 711 I NLQ normal pica 57 I The printing speed for high speed draft is reduced to the value in with thick paper over 0 18 mm The printing speed for high speed draft is reduced to the value of draft pica when any graphic character is in the line The printing speed for draft...

Page 24: ...0 feet maximum DATA STROBE tl tl tl t2 t3 tl 0 5 us min t2 7 us approx t3 5 us approx Figure 1 6 Data Transmission Timing Table 1 14 Connector Pin Assignments and Signal Functions Signal Return Signal Pin No Pin No Dir Description Name 1 19 STROBE In STROBE pulse to read data in Pulse width must be more than 0 5 Bs at receiving terminal 2 20 DATA 1 In These signals represent the 1st to 8th bits of...

Page 25: ... buffer is cleared This signal is normally atthe HIGH level and its pulse width must be more than 50 ps at the receiving terminal 32 ERROR out The level of this signal becomes LOW when the printer is in 1 Paper out status 2 Error status 33 GND TWISTED PAIR RETURN signal GND level 34 NC Not used 35 Pulled up to 5V through a 3 3 K ohm resistor 36 SLCT IN In The data between DC3 and DCI is invalid wh...

Page 26: ...nch screw 32KB intelligent parallel l F card C82312 inch screw 32KB intelligent parallel l F card C82313 inch screw Local Talk l F card card C82314 inch screw Coax l F card C82315 inch screw Twinax l F card Note The last digit of catalog varies depending on the country 1 4 Control Panel 1 4 1 Components Figure 1 7 Control Panel Buttons OPERATE 1 lock type button PAUSE TEAR OFF PAPER FEED l non loc...

Page 27: ...ntinuous paper inserted in the push tractor or cut sheets in the CSF when the printer has detected a paper out FONT Selects NLQ Roman NLQ Saris serif Draft and condensed of those 3 fonts in rotation Draft Draft cond Roman Roman cond Sans Saris cond Draft Draft cond The factory setting k the Draft uncondensed font The selection is executed when the button is released The selection is stored in non ...

Page 28: ...its this mode automatically in several seconds if no operation is performed Pressing FONT PAUSE or FONT PAPER FEED switches bins when a double bin CSF is installed there is no paper in the paper path and friction feed is selected IFONTl pApER FEED Ejects a cut sheet forward or feeds continuous paper backward to the paper park position 1 4 3 Indicators READY Ready to print Tear off Pause Paper erro...

Page 29: ... any Group 1 feature you want to change After you have set the feature at the bottom of Table 1 16 the printer returns to the first feature in Table 1 16 When all the settings are as you want them turn off the printer The settings will be stored in non volatile memory To change the settings shown in Table 1 17 Group 2 Features ESC P mode or in Table 1 18 Group 2 Features IBM mode follow the steps ...

Page 30: ...OFF Elite ON ON OFF Page length 11 inch OFF 12 inch ON ON ON 8 5 inch OFF 70 6 inch A4 ON ON BLINKS Skip over perforation No skip OFF Skip 1 inch ON BLINKS OFF Zero face o OFF 0 ON BLINKS ON Auto tear off Valid OFF Invalid ON BLINKS BLINKS Auto LF with CR Depends on l F OFF Valid ON Note The factory setting is that the READY LED is OFF for all features 1 21 ...

Page 31: ...PC866 ON GOST BLINKS PC861 BLINKS ON BLINKS ON Note The CG tables between PC437 Greek and PC861 are available only for European models When the CG table of PCXXX is selected the table is assigned as the table selected by the ESC tl command Then ESC tl and ESC 6 are set as defaults Codes 80 9FH are printable characters Table 1 18 Group 2 Features IBM Mode FONT COND READY CG table LED LED LED OFF OF...

Page 32: ...ext print position to the left margin when LF or ESC J code is sent 2 is one beep and is two beeps If no operation is executed within a few seconds the printer exits the power on selection mode with five beeps The selected value is stored in non volatile memory The printer automatically becomes ready to print after the selection 1 5 3 1 5 4 Buffer full Printing Hexadecimal Dump Press the PAUSE but...

Page 33: ...r out sensor detects a paper out the printer enters the pause condition automatically after feeding or printing several lines When a paper out is detected load new paper properly and set the printer ready to print by pressing 1 5 7 Auto Tear off the PAUSE button a When the release lever is set to one of the tractor positions the paper advances to the tear off position automatically if the input da...

Page 34: ...us paper loading and ejection paper park Move the release lever to REAR PUSH FRONT PUSH position and load the paper into the tractor unit Press the PAPER FEED button to load the paper automatically to the top of form position If a paper out is detected before printing starts the paper is automatically loaded to the top of form position without the PAPER FEED button being pressed If the FONT PAPER ...

Page 35: ...rint buffer and input data buffer The line spacing is set to 1 6 inch The page length and skip over perforation settings are returned to their default values All vertical tab positions are cleared The horizontal tab positions are set to every 8 columns The print mode is set to the default value set from the control paneI and stored in non volatile memory TOF position will be reset in the following...

Page 36: ...per was present at the start of a self test A sheet could not be ejected from the CSF Other paper detection error have occurred With single sheet feed selected no paper is present Continuous paper can t be loaded Paper runs out after the PAPER FEED button has been messed Illegal paper continuously till corrected release u nrelease The release lever has been changed while there was paper in the pap...

Page 37: ...ing maintenance and repair The main components are 1 2 3 4 5 BOARD ASSEMBLY C094 MAIN BOARD ASSEMBLY C094 PNL BOARD ASSEMBLY C076 PSB PSE Printer Mechanism Housing Assembly The following figure shows the main components of the FX 870 l 170 Platen Ga Pril PSB PSE y C094 M 7 Figure 1 11 Main Components 1 28 f AIN 1 ...

Page 38: ...drivers and head drive transistors PF MOTOR DRIVER CPU LPAI 476H TM P90C041F CENTRONICS l F o 7 q Cl lp E CR MOTOR f 4M 4 n Ill 1 PS RAM o 0 Q I 7 MASK OM T HEAD DRIVE I TRANSISTOR CN2 for OPTION o 0 GATE ARRAY E05A66YA 136 column model PF MOTOR E2PROM DRIVER CPU TM P90C041F CENTRONICS l F pPA1476H r CR MOTOR r o y qE2pR0M g f 24M r 0 ml E PS RAM 0 00 I r MASK ROM 0 n 0 CN2 for OPTION o 0 HEAD DRI...

Page 39: ...ee indicator LEDs Figure 1 13 BOARD ASSEMBLY C094 PNL Control Panel Circuit Board 1 6 3 BOARD ASSEMBLY C076 PSB PSE Power Supply Circuit Board This board is composed of an input filter circuit a transforming circuit a switching regulator circuit a rectifying circuit a smoothing circuit and various protecting circuits f Figure 1 14 BOARD ASSEMBLY C076 PSB PSE Power Supply Circuit Board 1 30 ...

Page 40: ...inter mechanism consists of a 9 pin impact dot head a carriage mechanism a carriage motor a paPer feed mechanism a paper feed motor a ribbon feed mechanism and various sensors 136 column 80 column model Figure 1 15 Printer Mechanism 1 31 ...

Page 41: ...6 5 Housing Assembly The printer mechanism and all the boards are contained in a housing assembly that consists of the uppercase and the lower case Printe Upper Lower Front Co L Figure 1 16 Housing Assembly 1 32 ...

Page 42: ...ce Mechanisms 2 6 2 1 4 3 Paper Paths 2 13 Ribbon Advance Mechanism 2 18 Supply Operation 2 19 Power Supply Overview 2 19 Power Supply Circuit Operation 2 20 2 3 Control CircuitOperation 2 22 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 3 6 2 3 7 2 3 8 Control Circuit Operation Overview 2 22 Reset Circuit 2 25 Sensor Circuits 2 26 Carriage Motor Drive Circuit 2 27 Paper Feed Motor Drive Circuit 2 28 Printhead ...

Page 43: ... Pull Tractor Feeding Using the Bottom Entrance 2 15 Figure 2 17 Paper Path for Friction Feeding Using the Front Entrance 2 l6 Figure 2 18 Paper Path for Push Tractor l eding Ueingthe Front En ance 2 16 figure 2 19 Paper Path for Pull Tractor Feeding Using the Front Entrance 2 17 Figure 2 20 Paper Path for Push pull Tractor Feeding Using the Front Entrence 2 l7 Figure 2 21 Ribbon Advance Mechanism...

Page 44: ...e how these driving wires work 1 The control circuit outputs drive signals to the printhead drive circuit This changes the printhead drive voltage and current flows through the corresponding printhead coil The coil acts as a solenoid and generates a magnetic force 2 Thisinducedforce causesthe plate toapproach the coil rod andtheassociated dotwire is rapidly ejected to impact on the platen 3 The do...

Page 45: ...imize the dot wire drive coil overheating the head is equipped with a thermistor that can detect the head temperature When the thermistor detects changes in the printhead temperature the voltage signal changes The CPU detects the voltage change and stops printing until the head temperature cools c The printhead is also used asa buzzer Head driving coils move allthedotwires backandforth atafrequenc...

Page 46: ...on along the carriage guide shaft The carriage CR motor a stepping motor drives the timin9 belt which moves the carriage The home position HP sensor detects the home position of the carriage NOTE Carriage initialization for the 80 coIumn and 136 column models are different Timing Belt Puny etec Or Hp d 0 3 Base Frame w w CR A Figure 2 2 Carriage Operation 2 3 ...

Page 47: ... carriage either toward or away from the platen and changes the platen gap Setting the adjust lever to position 2 the 5th slot from the top turns off the platen gap switch which slows down the printing speed of theprinterto protect the printhead The PG detector detects the position of the adjust lever The correct platen gap is 0 38mm 0 02mm with the adjust lever set to position O Printhead t Plate...

Page 48: ...od the pull tractor method and the push pull tractor method During normal operation the printer is set up with only one tractor which functions as either a push or a pull tractor depending on where it is attached on the printer To use the push pull tractor feed method an optional tractor must be attached There are four paper entrances for feeding paper into the printer Different paper entrances ar...

Page 49: ...per advance reduction gear The paper advance reduction gear turns the platen gear and the paper tension roller gear The paper advances in the direction of the white arrow Figure 2 4 illustrates the friction advance method when the paper is fed through the top paper entrance In the friction advance method the paper guide roller spring holds the paper against the platen You can release this pressure...

Page 50: ...r platen gear and the train of gears in the front pan of the printer When the PF motor pinion gear turns in the direction of the black arrow the tractor gear rotates in the direction of the black arrow and thus feeds the paper into the printer The paper is advanced by the paper drive roller and the platen which are also driven by the PF motor through the train of gears In the push tractor method t...

Page 51: ...REV A Paper Continuous RollerGe t Motor Paper Advance Reduction Gear Drive Roller Gear PF Push Tractor Push Tractor Gear Figure 2 6 Push Tractor Operation Using the Front Paper Entrance f 2 8 ...

Page 52: ...r exit and pulls the paper out of the printer mechanism As the result the paper tension unit is not required Figure 2 7 illustrates pull tractor operation when the paper is fed through the bottom paper entrance Paper Continuous t Pull Tractor J m ull Tractor Gear ML Tractor R e d u c t i o n G e a r Paper Drive Motor PF Paper Advance Paper Drive Rolle Gear w Reduction Gear Platen Gear Figure 2 7 P...

Page 53: ...he paper through the printer mechanism Figure 2 8 illustrates push pull tractor operation when the paper is fed through the rear paper entrance Figure 2 9 illustrates push pull tractor operation when the paper is fed through the front entrance Paper Continuous 8 Pull Tractor Push Tractor d v Yii ifx pushTractorGear Pul d Tractor Reduction Gear 1 PF Motor Pinion Gear i klotor PF Paper Advance Reduc...

Page 54: ...ctor J Pull Tractor Gear A Tractor Reduction Gear 1 PF Motor Pinion Gear Motor PF Paper Advance Reduction Gear Platen Gear Paper Drive Roller Gear Push Tractor Gear Push Tractor Figure 2 9 Push pull Tractor Operation Using the Front Paper Entrance 2 11 ...

Page 55: ...per free position the paper drive roller and the lower paper guide roller at the front entrance are separated from each other Figure 2 10 illustrates the release lever Figure 2 11 shows the function of each release lever setting Right Paper Frame Release Lever N 4 II II Paper Free a Release Shaft Detector RELEASE Figure 2 10 Release Lever t Friction Feed Front Top I Pull Tractor Front Rear Push Tr...

Page 56: ...is located in front of the printer mechanism and the rear PE detector is located behind the printer mechanism 1 Top entrance Figure 2 12 shows the paper path for friction feeding using the top entrance The top entrance is used only for friction feed method When the top entrance is used the rear PE detector senses when the paper is out Paper Cut Sheet Paper Tension Roller Detector PE Rear Paper Gui...

Page 57: ...eed method or the push pull tractor feed method When the rear entrance is used the rear PE detector senses when the paper is out Paper Continuous Paper Tension Roller Push Tractor Detector PE Rear Paper Guide Rollers Figure 2 13 Paper Path for Push Tractor Feeding Using the Rear Entrance Paper Continuous Printhead f Detector PE Rear Paper Guide Rollers Figure 2 14 Paper Path for Pull Tractor Feedi...

Page 58: ...re 2 16 shows the paper path fortractorfeeding using the bottom entrance The bottom entrance is used only for pull tractor feeding When the bottom entrance is used the front PE detector senses when the paper is out Paper Paper Continuous Detector PE Front Lower Paper Guide Roller Figure 2 16 Paper Path for Pull Tractor Feeding Using the Bottom Entrance 2 15 ...

Page 59: ...eed method When the front entrance is used the front PE detector senses when the paper is out Paper Continuous Paper Pri Drive Paper Tension Roller nthead Roller Detector PE Front Lower Paper Guide Roller Figure 2 17 Paper Path for Friction Feeding Using the Front Entrance Paper Paper Continuous j Paper Tension Roller j Platen XmJ L J w Lower Paper Guide Roller Detector PE Front Push Tractor Figur...

Page 60: ... Paper Guide Roller Figure 2 19 Paper Path for Pull Tractor Feeding Using the Front Entrance Paper Continuous Paper Drive Roller Lower Paper Guide Roller Detector PE Front Push Tractor Figure 2 20 Paper Path for Push pull Tractor Feeding Using the Front Entrance 2 17 ...

Page 61: ...ble 2 2 Ribbon Advance Gear Linkage I Direction of Carriage Movement Gear Linkage Left to right Belt driven pulley Gear 1 Gear 2 indicated by the black arrow Ribbon driving gear Right to left Belt driven pulley Gear 1 O Gear 3 0 indicated by the white arrow Gear 4 0 Ribbon driving gear Y The ribbon brake spring attached to the exit slot of the cartridge case prevents slack in the ribbon and keeps ...

Page 62: ...ble 2 3 Power Supply Input Voltages and Fuse Ratings 1 Board Input Voltage Fuse F1 Rating I I I C076 PSB I 103 5 132 VAC I 2 5 AJ125 V I I C076 PSE I 198 264 VAC I 7 25 lV250 V I 2 2 1 Power Supply Overview The power supply board has two power output lines that supply power to the control circuits and the drive mechanisms Table 2 3 lists the components pans or assemblies of the printer that are po...

Page 63: ...tion of the switching circuit and then the output of 35 VDC voltage The 35VDC line has a voltage overload protection circuit and a voltage drop protection circuit The 35VDC voltage overload protection circuit cuts the 35 VDC line output if the voltage exceeds 36 VDC It stops the operation of the switching circuit and then the output of the 35 VDC voltage The voltage drop protection circuit protect...

Page 64: ...1 1 I 1 1 t 1 5 v Switching Regulator 5V Over Current Control Circuit 5V Over Voltage Control Circuit I 1 ZD51 Photo 35 V Line coupler Detector Circuit I 8A 1 1 1 1 I 1 1 1 1 1 I I t t I I I I I I I I 1 I I I I 1 t 1 1 1 1 I 5 V Line Voltage ZD53 Photo Overload coupler Protection Circuit 35 V Line Voltage Drop Protection Circuit 4 35 VDC 5 VDC Switch Figure 2 22 Power Supply Circuit Block Diagram ...

Page 65: ...ns that control the memory assignment and 1 0 areas The output signals from each detector are sent to the analog input poti of the CPU The signals from the control panel are sent to the gate array which in turn sends LED signals to the control panel The two motors CR and PF are controlled by signals sent from the stepping motor control port of the CPU Figure 2 23 shows the control circuits in bloc...

Page 66: ...st computer to the printhead Data sent from the host computer is converted to image data and transmitted to the printhead through the gate array CPU El Print data conversion Image data transfer 1 Input buffer L Image buffer Figure 2 24 Data Flow 2 23 ...

Page 67: ...ge data to the printhead drive circuit Also controls various printer mechanism parts such as the motors E05A66YA IC4 This gate array mainly performs the following five functions Memory management Centronics l F control Control panel control E2PROM control Printhead drive circuit control PROM IC3 The PROM contains the program that runs the CPU RAM IC2 The RAM contains the CPU working area and the b...

Page 68: ...SC terminal on the gate array does not reach 5 VDC until capacitor C24 is fully charged A similar integration circuit is provided in the gate array and further delays the output of the ROUT signal This low level is used as a reset signal 2 INIT signal reset The reset signal is also issued when the INIT signal is sent from the host computer Figure 2 25 shows the power on reset circuit GA IC4 35VDC ...

Page 69: ...elow 31 V approx the printer stops printing fora while As soon asthevoltage recovers the printer starts to print at a half speed The PF motor also slows down The Vref circuit is used to supply the reference voltage for the A D convertor in the CPU The CPU constantly monitors the printhead temperature If the printhead temperature exceeds the maximum level the printer stops printing until the temper...

Page 70: ... the CR motor speed The printer may stop printing to protect the CR motor from overheating if a continuous printing of short columns less than 10 columns is repeated The printer uses CPU ports P60 to P63 exclusively to control the CR motor CPU IC2C1 P60 P61 P62 P63 E05A66YA IC4 G PC4 Data PC5 Bus PC6 Speed mode 4 3 9 8 1 5 6 2 3 1 2 5 1 2 1 4 5 24 1 8 INA CRA INB CR A IN A CRB IN B CR B LOW MIDDLE...

Page 71: ...hin the uPA1476H lCl depending on the phase data sent from the CPU When there is an output at A19 of the CPU a 35 V voltage is supplied to the PFCOM terminal of the PF motor Otherwise a 5 V voltage is supplied through D1 to hold the motor CPU P70 UPA1476H lCl MOTOR ASSEMBLY PF PFAIN B1 c l PFA 1 t P72 H PF N B2 P71 w PFBIN B3 P73 PF lN B4 d r PF A 1 t C2 1 1 1 PFB 1 C3 1 1 1 PF B 1 C4 1 I 1 L J 3 ...

Page 72: ...9 Printhead Drive Circuit 2 3 7 Parallel Interface Circuit The parallel interface circuit controls the data flow from the host computer When a STROBE signal is sent from the host computer the data is latched into the gate array E05A66YA Data is transmitted until a BUSY signal is automatically sent back to the host computer to stop the data Then the gate array outputs an IBF signal to P82 the inter...

Page 73: ...on volatile memory containing information such asthetop of form position Because the E2PROM is a serial 1 0 device the gate array converts the parallel data sent from the host computer into serial data E2 PROM C5C1 E05A66YA IC4 CPU IC2C1 Data Bus SCL SCK SDA SDA Figure 2 31 E2PROM Control Circuit 2 30 ...

Page 74: ...FRAME ASSEMBLY REAR 3 11 3 2 5 3 Removing the MOTOR ASSEMBLY CR 3 12 3 2 5 4 Removing the MOTOR ASSEMBLY PF 3 13 3 2 5 5 Disassembling the GEAR TRAIN PF 3 14 3 2 5 6 Removing the CARRIAGE GUIDE ASSEMBLY 3 15 3 2 5 7 Removing the Ribbon Drive RD ASSEMBLY 3 17 3 2 5 8 Removing the Home Position HP DETECTOR 3 18 3 2 5 9 Removing the Platen Gap PG DETECTOR 3 18 3 2 5 10 Removing the Front and Rear Pap...

Page 75: ...re 3 14 Positioning the LEVER RELEASE for Insertion 3 14 Figure 3 15 Removing the CARRIAGE GUIDE ASSEMBLY 3 15 Figure 3 16 Attaching the TIMING BELT 3 16 Figure 3 17 Removing the RD ASSEMBLY 3 17 Figure 3 18 Removing the DETECTOR HP 3 18 Figure 3 19 Removing the DETECTOR PG 3 18 Figure 3 20 Removing the DETECTORS PE 3 19 Figure 3 21 Removing the DETECTOR RELEASE 3 20 Figure 3 22 Arranging the Cabl...

Page 76: ...um printer operation use only the recommended tools for maintenance work Also only the lubricants recommended in Chapter 6 Adjust the printer only as described in this manual See Chapter 4 3 1 2 Tools Tables 3 1 and 3 2 list the recommended tools needed to disassemble assemble or adjust the printer Use only tools that meet these specifications Table 3 1 RecommendedTools Tool Part No Round nose pli...

Page 77: ...y Is the paper advance motor running at the l Checked Not necessary correct temperature and not overheating Paper path Is the type of paper in the printer feeding l Checked l Not necessary smoothly Is the tractor feeding the paper correctly l Checked Not necessary Is the paper path clear of all obstructions l Checked l Not necessary Is the platen free of damage l Checked Not necessary Ribbon mask ...

Page 78: ...ecessed Bind head B tight screw CBC Cross recessed Bind head C tight screw CBN Cross recessed Bind head N tight screw CBS Cross recessed Bind head S tiaht screw Table 3 5 Screw Types and Abbreviations Head Body Washer assembled Top Side 1 ross recessed head 1 ind 1 ormal 1 lain washer b Q 0 2 tight 2 lotted head with IJotch ma 2 tside toothed I 1 1 lock washer e 2 an 0 Q 3 Qlp b 4 apping 3 pring w...

Page 79: ...e end of the description of each procedure Be sure to follow the instructions in these notes WARNING Before disassembling the printer read the warning in Section3 1 CAUTION Before disassembling any part of the printer remove the paper and the ink ribbon Also disconnect the interface cable Note Exploded diagrams in the appendix show how the components fit together Refer to them as L necessary The f...

Page 80: ...r front cover paper eject cover and tractor unit Front Cover Figure 3 2 Removing the PAPER GUIDE ASSEMBLY LY Note Remove the paper eject cover and the tractor unit by pushing and releasing the hooks at both sides When remounting them be sure to snap these hooks on the projecting parts 3 5 ...

Page 81: ... two clips on the bottom of the panel unit and remove the PANEL UNIT STEP 3 Remove the flexible flat cable FFC cable PAN Figure 3 3 Removing the PANEL UNIT Assembly Note The FFC cable must be connected properly as shown below Plain Face 4 FFC Cable Q4a Face with exDosed I I terminals at he end of the cable w Figure 3 4 Connecting the FFC Cable to the PANEL UNIT m c 3 6 ...

Page 82: ...ove the PAPER GUIDE ASSEMBLY top cover front cover paper eject cover and tractor unit See Section 3 2 1 STEP 21 Remove the two CBS M3X8 screws and the FFC cable from the PRINTHEAD STEP 31 Remove the PRINTHEAD Figure 3 5 Removing the PRINTHEAD 3 7 ...

Page 83: ... screws securing the HOUSING ASSEMBLY UppER There are only two screws in the 80 column printer STEP 41 Push the two hooks through the cutouts located on the front cover to disengage the hooks from the plates Lift up the front side of the HOUSING ASSEMBLY UPPER STEP 51 Remove the HOUSING ASSEMBLY UPPER HOUSING ASSEMBLY UPPER CBC M4X15 c u t f Šˆ Figure 3 6 Removing the HOUSING ASSEMBLY UPPER Note T...

Page 84: ...LY UPPER See Section 3 2 4 Remove the four CBB M4X12 screws securing the PRINTER MECHANISM Remove the CBS M3X6 screw securing the INTERFACE COVER Disconnect the following connectors on the BOARD ASSEMBLY MAIN CN3 2 pin Blue CN4 2 pin White CN5 2 pin Black CN6 6 pin CN7 2 pin yellow CN8 ld pinh CN9 S pin r CN12 lO pin and CN13 5 pin Remove the PRINTER MECHANISM CBB M4X12 h I CBS M3X6 1 la INTERFACE...

Page 85: ... PANEL UNIT See Section 3 2 2 STEP 31 Remove the HOUSING ASSEMBLY UPPER See Section 3 2 4 STEP 4 Remove the two CBS M3X8 screws securing the COVER PLATEN STEP 51 Disengage the teeth of the PLATEN SHAFT HOLDERS and rotate them STEP 61 Remove the PLATEN KNOB STEP 7 Slide the PLATEN ASSEMBLY and remove it h C B S M3X8 PLATEN KNOB DER Figure 3 8 Removing the PLATEN ASSEMBLY 3 1o ...

Page 86: ...ee Section 3 2 5 1 Remove the four CBS M3X8 screvvs securing the LEFT FRAME of the pRINTER MECHANISM and the nut and washer securing the LEVER G ADJUST Remove the BUSHING PARALLEL ADJUST Remove the LEFT FRAME Remove the FFC cables from the RIGHT FRAME of the PRINTER MECHANISM and then the two CBS M3X8 screws securing the RIGHT FRAME Remove the FRAME ASSEMBLY REAR Push the clip on the back of the F...

Page 87: ... tension spring disengage the TIMING BELT from the MOTOR ASSEMBLY CR and hang it on the hook Disconnect the connector CN13 on the BOARD ASSEMBLY C094 MAIN Remove the MOTOR ASSEMBLY CR Remove the two CBN M3X6 screws on the back of the MOTOR ASSEMBLY CR Remove the MOTOR ASSEMBLY CR F MOTOR ASSEMBLY CR Face Screw M3X7 Spring L i PLATE BELT TENSION L J A CBN M3X6 Figure 3 10 Removing the MOTOR ASSEMBL...

Page 88: ...NG ASSEMBLY UPPER See Section 3 2 4 STEP 41 Remove the PRINTER MECHANISM See Section 3 2 5 STEP 51 Set the LEVER RELEASE to the vertical or forward position STEP 61 Remove the FFC cables and then the two CBS M3X8 screws securing the MOTOR ASSEMBLY PF STEP 71 Remove the MOTOR ASSEMBLY PF This position does not release LEVER POSITIONS the MOTOR ASSEMBLY PF RELEASE ASSEMBLY PF CBS M3X8 Figure 3 12 Re...

Page 89: ... PRINTER MECHANISM See Section 3 2 5 Remove the MOTOR ASSEMBLY CR See Section 3 2 5 3 Remove the MOTOR ASSEMBLY PF See Section 3 2 5 4 Remove the FFC cables from the FRAME SUB RIGHT of the PRINTER MECHANISM and then remove the two CBS M3X8 screws securing the FRAME SUB RIGHT Remove the FRAME SUB RIGHT 1 FFC Cables CAM CLUTCH TRACTOR Figure 3 13 Disassembling the GEAR TRAIN PF Assembly Note Be sure...

Page 90: ...e HOUSING ASSEMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 Remove the PLATEN ASSEMBLY See Section 3 2 5 1 Remove the LEH FRAME of the PRINTER MECHANISM See Section 3 2 5 2 Disengage the TIMING BELT from the MOTOR ASSEMBLY CR See Section 3 2 5 3 Release the TIMING BELT from the two clips at the bottom of the CARRIAGE ASSEMBLY Move the CARRIAGE ASSEMBLY to the MOTOR AS...

Page 91: ...he TIMING BELT to the CARRIAGE ASSEMBLY secure the TIMING BELT using the left and right clips of the CARRIAGE ASSEMBLY as shown below Make sure there is no slack in the TIMING BELT Clip TIMING BE Figure 3 16 Attaching the TIMING BELT 3 16 ...

Page 92: ...EMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 Remove the PLATEN ASSEMBLY See Section 3 2 5 1 Remove the LEIT FRAME of the PRINTER MECHANISM See Section 3 2 5 2 Disengage the TIMING BELT from the MOTOR ASSEMBLY CR See Section 3 2 5 3 Remove the CARRIAGE GUIDE ASSEMBLY See Section 3 2 5 7 Remove the CBC M3X8 screw and the CBB M3X8 screw securing the RD ASSEMBLY Remove ...

Page 93: ... 61 Remove the PAPER GUIDE ASSEMBLY top cover front cover paper eject cover and tractor unit See Section 3 2 1 Remove the PANEL UNIT See Section 3 2 2 Remove the HOUSING ASSEMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 Remove the two clips of the DETECTOR PG attached to the LEFT FRAME of the PRINTER MECHANISM Remove the detector Disconnect the LEAD PG from the DETECT...

Page 94: ...e the PANEL UNIT SeeSection 3 2 2 Remove the HOUSING ASSEMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 I Remove the PLATEN ASSEMBLY See Section 3 2 5 1 Remove the FRAME ASSEMBLY REAR See Section 3 2 5 2 Remove the clip for each DETECTOR PE mounted on the PAPER GUIDE ASSEMBLY REAR Remove the DETECTOR PE FRONT and DETECTOR PE REAR Remove the LEAD from each DETECTOR PE F...

Page 95: ...UNIT See Section 3 2 2 Remove the HOUSING ASSEMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 Remove the PLATEN ASSEMBLY See Section 3 2 5 1 Remove the FRAME ASSEMBLY REAR See Section 3 2 5 2 Remove the two clips of the DETECTOR RELEASE mounted on the PAPER GUIDE ASSEMBLY REAR Remove the DETECTOR RELEASE Disconnect the LEAD RELEASE from the detector L Figure 3 21 Removi...

Page 96: ...REV A 3 2 5 12 Arranging the Cables When you assemble the printer arrange the cables as shown in Figure 3 22 1 n n n hl 7 d o PRINTER MECHANISM b w Bottom figure 3 22 Arranging the Cables 3 21 ...

Page 97: ...ove the right tractor frame from the tractor shaft and the tractor guide shaft STEP 41 Remove the E ring from the tractor shaft STEp 51 Remove the right tractor the paper support unit and the left tractor from the tractor shaft and tractor guide shaft 9 Figure 3 23 Disassembling the Tractor Unit 17 Assembly Note When reassembling the tractor unit be sure to snap the clips of the cog 17 onto the tr...

Page 98: ...e the PRINTER MECHANISM See Section 3 2 5 Disconnect the cable from connector CN2 on the BOARD ASSEMBLY C076 PSB pSE Remove SUPPORT l F from the BOARD ASSEMBLY C094 MAIN Remove the two CBS M3X12 screws securin9 the cover for the oPtional interface card Remove the CBC M3X8 screwandthe five CBB M3X12 screws securing the BOARD ASSEMBLY C094 MAIN Remove the GROUNDING PMTE I F Remove the BOARD ASSEMBLY...

Page 99: ...BLY top cover front cover paper eject cover and tractor unit See Section 3 2 1 Remove the PANEL UNIT See Section 3 2 2 Remove the HOUSING ASSEMBLY UPPER See Section 3 2 4 Remove the PRINTER MECHANISM See Section 3 2 5 Remove the three CBB M3X12 screws and the two CBC M3X8 screws on the BOARD ASSEMBLY C076 PSB PSE Remove the connectors CN1 2 pin and CN2 1 l pin Remove the BOARD ASSEMBLY C076 PSB PS...

Page 100: ...gnment Adjustment 4 2 4 2 1 Overview of the Bidirectional Alignment Adjustment 4 2 4 2 2 Bidirectional Alignment Adjustment Prooedure 4 3 LIST OF FIGURES Figure 4 1 PARALLELISM ADJUSTMENT BUSHING 4 2 Figure 4 2 Bidirectional Alignment Adjustment Draft mode 4 3 Figure 4 3 Bidirectional Alignment Adjustment NLQ mode 4 3 4 i ...

Page 101: ... ADJUST to the O setting STEP 31 Remove the RIBBON MASK using tweezers STEP 41 Adjust the platen gap according to the following flowchart The correct platen gap is 0 38 mm 0 02 mm Use the clearance gauge and adjust the gap so that the 0 36 mm gauge will fall into the gap and the 0 41 mm gauge wiil not Never try to force the gau9e into the 9aP To widen the gap rotate the PARALLELISM ADJUSTMENT BUSH...

Page 102: ...d with the printing in the other direction Otherwise printed vertical lines may be staggered It is important to readjust the bidirectional alignment whenever anything has been done to the gear arrangement of the printer mechanism that might affect this alignment The bidirectional alignment can be adjusted by altering the timing in which the carriage moves from one end to the other Since no two pri...

Page 103: ...numbered lines 1 st and 3rd adjust the even numbered lines 2nd and 4th 1 f the even numbered lines are shifted to the right press the FONT button to shift them to the left The Adjust value increases by the shifted amount 2 f the even numbered lines are shifted to the left press the PAPER FEED button to shift them to the right The Adjust value decreases by the shifted amount Press the PAUSE TEAR OF...

Page 104: ...hanism 5 18 LIST OF FIGURES Figure 5 1 The Troubleshooting Procedure 5 1 Figure 5 2 Printhead Resistance 5 2 LIST OF TABLES Table 5 1 Motor and Printhead Coil Resistance 5 1 Table 5 2 Error Indication 5 3 Table 5 3 Symptomsand Flowchart References 5 4 Table 5 4 RepairingtheBOARD ASSEMBLY C076PSBIPSE 5 11 Table 5 5 RepairingtheBOARD ASSEMBLY C094MAIN 5 14 Table 5 6 Repairing the Printer Mechanism 5...

Page 105: ... 10 5 5 5 13 The problem is corrected Figure 5 1 The Troubleshooting Procedure The following tables provide troubleshooting information Table 5 1 Motor and Printhead Coil Resistance Part Coil Resistance Motor Assembly CR 5 0 ohms 77 at 25 degrees C 77degrees F CN13 on the main board 1 2 3 4 pin phase A B IMotor Assembly PF 63 ohms 3 ohms at 25 degrees C 77degrees F CN6 on the main board 1 2 3 4 pi...

Page 106: ...o 3 o 4 o 5 o 6 O 7 o 8 O 9 o IWIRE ASSIGNMENT Coil Resistance 16 5 1 6Q at 25 C Bemeen each dot wire and common COM 8 9 COM 1 5 COM TERMINAL ASSIGN MENTI Note COM 2 2 4 6 COM 8 7 8 9 COM 14 1 3 5 Figure 5 2 Printhead Resistance t j 5 2 ...

Page 107: ... eject a sheet Buzzer beeps Paper out error Single sheet feed is selected and no paper is present Continuous paper cannot be loaded Paper runs out after the PAPER FEED button has been pressed Buzzer beeps Paper release error The paper release lever is set to an continuously inappropriate position All indicators blink Fatal error simultaneously All indicator LEDs blink Voltage error The power suppl...

Page 108: ...ay from the home position at chart 2 power on The printer does not enter READY mode when the carriage returns to the home position Self test printing abnormal The printer does not print the self test chart 3 Carriage operation is The printer does not print some of the dots normal Paper feed abnormality The printer does not feed the paper chart 4 The paper feed is irregular Control panel operation ...

Page 109: ... electric shock START Use the correct AC input voltage Voltage range 103 5 132 V Voltage range 198 264 No fluctuation from the recommended AC voltage range is permitted Replace the fuse and disconnect CN14 on the BOARD ASSY No No v Measure the VP 35 VDC at pin 10 CN2 of the BOARD ASSY C076 PSB PSE Yes Measure the VL 5 VDC at pin 1 CN2 of the BOARD ASSY C076 PSB PSE No END END 5 5 ...

Page 110: ... connectors and the printer mechanism Yes problem corrected coil resistance correct 5 ohms 7 at room v Replace the BOARD ASSY C094 MAIN END problem corrected v Refer to Section 5 5 Repairing the Printer Mechanism END Note If any coils in the CR motor are shorted also test the motor drivers on the BOARD ASSY C094 MAIN 5 6 ...

Page 111: ...lf test To start the self test turn on the printer while holding down the PAPER FEED button I Does the printer CN3 4 5 6 7 8 9 and 13 connecting the BOARD ASSY C094 MAIN and the printer mechanism Perform the bidirectional I Yes Adjust the platen gap properly inserted Replace the BOARD ASSY C094 MAIN No 5 7 ...

Page 112: ...l resistance correct 63 ohms 3 at room Replace the PF motor smoothly when the printer Repair the BOARD ASSY C094 MAIN I v END No I Refer to Section 5 5 Repairing the Printer Mechanism Yes END v END Note If any coils in the PF motor are BOARD ASSY C094 MAIN shorted also test the motor drivers on the 5 8 ...

Page 113: ...ecting the BOARD ASSY C094 PNL and the BOARD Insert connector ASSY C094 MAIN inserted CN12 correctly I No A Q Yes END Repair the BOARD ASSY C094 MAIN Replace the BOARD ASSY C094 PNL Replace the BOARD ASSY C094 PNL I Yes zm l H Repair the ASSY CO z I v v END 5 9 ...

Page 114: ...e printer while holding down the PAPER FEED button See Section 5 3 self test correctly through 5 5 G Check the printer s default settings See Section 1 5 1 for information on Yes 1s the problem corrected No Replace the interface cable that connects the printer to the host computer END Yes Is the problem corrected No Replace the BOARD ASSY C094 MAIN I END END 4 f 5 1o ...

Page 115: ...ovides proper waveforms resistance values and other information for each component of the C076 PSB PSE rwAR NG The OPERATE button on the control panel turns on or off only the secondary power circuit so the primary power circuit IS Ilve as long as the printer IS connected to an AC power outlet Do not touch the heat sink attached to the FET Ql when the printer is powered Table 5 4 Repairing the BOA...

Page 116: ...roblem The voltage of the 35 V line is below thespecifiedvalue Cause Q3 ICI Pcl PC2 Q2 is dead Checkpoint Check the voltage waveforms at Q3 CH1 O 2V TlME 2 s Check the voltage waveforms at Q2 I I H I CH1 2V 1 1 1 I Solution Replace D3 Icl Pcl PC2 ZD51 or Replace Q2 ...

Page 117: ...point heck the 35 V line heck the oscillation waveform IC51 pin 5 and the switching waveform IC51 pin 8 I I I I I I I I I I II Ill I II II I I I 1 1 1 I 1 I CH1 2V CH2 20V TlME 20ps Check the switching waveform at Q52 emitter F 1 1 1 1 1 1 1 1 1 L II CH1 20V TlME 20 s 1 1 1 I I 1 Solution efer to tht terns iescribed bove eplace C51 Replace D51 or D52 5 13 ...

Page 118: ...Y C094 MAIN Problem Symptom Cause Checkpoint Solution Abnormal The CPU The reset Check the voltage waveforms of the VDD 5 Replace IC4 Dperation at does not circuit is V IC4 pin 41 and ROUT IC4 pin 15 when the power on operate defective power is turned on properly 1 CHl Power m A 1 I I I I I I 1 II I I I I I I 1 II Ill I 1 I 1 1 I I I I 1 II I I I 1 1 T 1 CH1 2V CH2 2V TIME O IS 1 1 1 I The control...

Page 119: ...ctive 28 is not correct ower on operate replace properly IC2CI Otherwise replace CR1 CHI 2V TIME O lVS 1 1 1 arriage The carriage IC6 is Check the input signal pin 5 and the output Replace IC6 operation does not defective waveform pin 8 bnormal operate at all CH2 PIN 8 B q w i l s I f u I I I I I I I I Ill I 1 I I 1 1 I I I I I I I I I I I II I I I I I I I 1 CH1 PIN 5 falww d LkL CHI 5V CH2 50V TI...

Page 120: ...1 II I II II I I I I I I I I I 1 I CHI PIN 63 m 4 m m I f f n 9 9w W 9 CH1 5V CH2 5V TIME O 2ms 1 1 1 1 1 Self test A particular One of the Check the head drive signal at the base and the If the signal Jrinting dot fails to head drive emitter of each transistor at the base bnormal print transistors is is normal defective L J repiace the Q2 4 5 6 4CH2 Emitter transistor 8 9 10 11 J Otherwise or 12 ...

Page 121: ...CI abnormal does not defective waveform pin 3 feed the I paper at all CH2 PIN 3 or the paper E feed is k b irregular I I I I I I h I I I II t I I I I I II I I i l 1 k WI Cf Il PIN 2 i m 4 CH1 2V CH2 50V TlME 2ms r 1 1 I I 1 ncorrect Data is Either IC4 or Replace IC4 rinting of corrupted IC5 is or IC5 iata sent when the defective from the parallel host interface is omputer used 5 17 ...

Page 122: ...power on lodged in the check that this substances gears or moves the belt 5 elsewhere in the pulley on the mechanism carriage motor The MOTOR ASSY Measure the coil Replace the CR is defective resistance of the MOTOR ASSY CR motor The resistance should be approximately 5 0 ohms Carriage movement The MOTOR CR The belt pulley is Check the pulley Replace the belt abnormal rotates but the defective for...

Page 123: ...f the tip of Replace the light or the print defective the dot wire is printhead density is not worn uniform The platen gap is Set the LEVER G Adjust the gap as not adjusted ADJUST to O and described in properly check the gap Platen Gap between the the Adjustment in printhead and the Chapter 4 platen The correct gap is 0 36 0 40 mm Paper feeding The printer prints Foreign substances Visually check ...

Page 124: ...correctly The platen gap is not adjusted correctly The DETECTOR PE is defective Checkpoint Remove the ribbon cartridge Then rotate the ribbon f e e d r o l l e r manually to check that the ribbon cartridge feeds the ribbon normally Check that the ribbon driving gear rotates properly when the carriage is moved manually Manually move the carriage and check that the planetary gear functions normally ...

Page 125: ...V A 6 1 6 2 CHAPTER 6 MAINTENANCE Preventive Maintenance 6 1 Lubrication 6 1 LIST OF FIGURES Figure 6 1 Lubrication Points 6 3 LIST OF TABLES Table 6 1 Lubricants 6 1 Table 6 2 Lubrication Points 6 2 6 i ...

Page 126: ...nance work Do not use thinner tnchloroethylene or ketone based solvents on the plastic components of the 6 2 Lubrication EPSON recommends that the printer be lubricated at the points shown in Figure 6 2 Table 6 2 lists each lubrication point and its recommended lubricant All the lubricants have been tested extensively and found to comply with the requirements of this printer Table 6 1 describes th...

Page 127: ...ME G 26 excluding the two slots at the bottom 2 The arms and tab of the RD ASSEMBLY G 26 3 The shaft end of the ROLLER ASSEMBLY DRIVE G 26 4 The ribbon drive gear train G 26 5 The OIL PAD in the CARRIAGE ASSEMBLY o 2 6 The cam surface of the CAM CLUTCH TRACTOR G 26 7 The cam end of the SPUR GEAR 34 5 G 26 f 4 c 6 2 ...

Page 128: ...REV A Figure 6 1 Lubrication Points 6 3 ...

Page 129: ...AIN Component Layout A 12 Figure A 10 BOARD ASSEMBLY C076 PSB Component Layout A 13 Figure A 11 BOARD ASSEMBLY C076 PSE Component Layout A 14 Figure A 12 BOARD ASSEMBLY C094 PNL Component Layout A 15 Figure A 13 FX 870 Case Outline Drawing A l6 Figure A 14 FX I 170 Case Outline Drawing A l7 LIST OF TABLES Table A 1 C094 MAIN Board Connector Summary A 2 Table A 2 CN2 Board Assembly C094 MAIN A 3 Ta...

Page 130: ...primary components Table A 1 summarizes the functions and sizes of the connectors BOARD ASSEMBLY C076 PSB PSE I I BOARD ASSEMBLY C094 MAIN CN1 I IDETEC R PG1 IEF 1 I I I I DETECTOR E Front 1 PRINTHEAD 1 PRINTER MECHANISM I BOARD ASSEMBLY C094 PNL Figure A 1 Cable Connections A 1 ...

Page 131: ...r 36 C094 MAIN CN2 Optional Interface 36 CN3 DETECTOR PE Front 2 Blue CN4 DETECTOR RL 2 White CN5 DETECTOR PG 2 Black CN6 MOTOR ASSEMBLY PF 6 CN7 DETECTOR HP 2 Yellow CN8 PRINTHEAD 14 CN9 DETECTOR PE Rear 3 CN12 BOARD ASSEMBLY C094 PNL 10 CN13 MOTOR ASSEMBLY CR 5 CN14 BOARD ASSEMBLY C076 PSB PSE 11 f i L E 2 A 2 ...

Page 132: ...0 D7 Data Bus Bit 7 30 1 0 D6 Data Bus Bit 6 31 1 0 D5 Data Bus Bit 5 32 1 0 D4 Data Bus Bit 4 33 1 0 D3 Data Bus Bit 3 34 1 0 D2 Data Bus Bit 2 35 1 0 D1 Data Bus Bit 1 36 1 0 DO Data Bus Bit O Table A 3 CN3 BOARD ASSEMBLY C094 MAIN No 1 0 Signal Name Function 1 GND Signal Ground 2 I PEF Paper End FRONT Table A 4 CN4 BOARD ASSEMBLY C094 MAIN No 1 0 Signal Name Function 1 GND Signal Ground 2 I Lsw...

Page 133: ...BOARD ASSEMBLY C094 MAIN No 1 2 3 4 5 6 7 8 9 10 1 0 o 0 0 0 I I I I Signal Name 5 READY STAT FONT COND PAUSE FONT PFEED OPERA GND Function 5 VDC READY LED STAT LED Not equipped FONT LED CONDENSED LED PAUSE BUTTON FONT BUITON PAPER FEED BUTTON OPERATE BUTTON Signal Ground Table A n CN13 BOARD ASSEMBLY C094 MAIN f No 1 0 Signal Name Function 1 0 CR A CR Motor Phase A 2 0 CR CR Motor Phase 3 0 CR B ...

Page 134: ...d 4 r I m 0 C2 c O EN l I t J 1 I I m I I k I 1 _ m u Figure A 4 BOARD ASSEMBLY C076 PSB Circuit Diagram Annotated A 7 ...

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Epson FX 1170 - B/W Dot-matrix Printer, Service Manual

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