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Principles of Operation

Push-pull Tractor Method

The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors

are used to advance the paper: one at the front paper entrance and the other at the rear paper
entrance. They operate simultaneously to push and pull the paper through the printer mechanism.
Figure 6-8 illustrates push-pull tractor operation when the paper is fed through the rear paper
entrance. Figure 6-9 illustrates push-pull tractor operation when the paper is fed through the front
entrance.

Paper (Continuous)

Pull Tractor

Pull Tractor Gear

Push Tractor

Push Tractor Gear

Tractor Reduction Gear

,PF Motor Pinion Gear

Motor

Paper Advance
Reduction Gear

Figure 6-8. Push-pull Tractor Operation Using the Rear Paper Entrance

6-10

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Summary of Contents for FX-1170

Page 1: ...FX 870 1170 SERVICE MANUAL I Revision Level I EPSON Printed on Recycled Paper ...

Page 2: ...ent into an outlet on a circuit different from the one connected to the receiver For Canadian Users This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications Le present appareil numcrique n cmet pas de bruits radkklectrique d passant lea limites applicables...

Page 3: ... shall be liable to the purchaser of this product or third parties for damages losses costs or expenses incurred by purchaser or third parties as a result of accident misuse or abuse of this product or unauthorized modifications repairs or alterations to this product Epson America Inc shall not be liable against any damages or problems arising from the use of any options or any consumable products...

Page 4: ...ct 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 the power supply and other electronic components CAUTION 1 Repairs on Epson products should be performed only by an Epson certi fied repair technician 2 Make certain that the source voltage is the same as the rated voltage listed on the serial number rating plate ...

Page 5: ...rs may ask the servicer an explanation and tables of control panel settings and a brief description of the major printer components 2 Installation and Setup Procedures This section lists site requirements for the printer It describes how to unpack the printer connect it power it up and test it The text describes the printer interfaces and gives signal tables and serial cable configurations Finally...

Page 6: ...ism 6 Principles of operation The Principles of Operation section explains the theory of printer operation including printhead function carriage movement paper feeding and ribbon feeding The chapter provides details about how printer components function mechanically and electronically At the end of the chapter there is a section for dealers outside the U S who need to replace individual components...

Page 7: ...rtador 498 Piso 12 1001 Buenos Aires Phone 541 394 2439 Fax 541 322 4637 Epson Mexico S A De C V Av Ejercito NacionaI No 904 6 Piso Col PaIamas Polanco Condigo Postal 11510 Mexico D F hp 525 395 9944 525 395 9499 Epson Latin America Inc 6100 Blue Lagoon Drive Floor 2 Suite 220 Miami FL 33126 Phone 305 265 0092 Fax 305 265 0097 Epson Chile S A Avenida Costanera Andres Bello 2287 Providencia Santiag...

Page 8: ...ialization 1 26 Buzzer 1 27 Main Components 1 28 Commonly Asked Questions and Answers 1 33 Chapter 2 Installation and Setup Procedures Site Requirements 2 1 Removing the Packing Materials 2 1 The Correct Power On Sequence 2 1 Running the Self Test 2 2 Connecting Printer Cables 2 2 Checking the Printer with the Computer 2 3 Tips to Increase Printer Life 2 4 Chapter 3 Troubleshooting Test Points 3 1...

Page 9: ...Housing Assembly 4 8 Removing the Printer Mechanism 4 9 Chapter 5 Adjustments Maintenance and Lubrication Adjusting the Printer Mechanism 5 1 Bidirectional Alignment Adjustment 5 3 Preventive Maintenance 5 5 Lubrication 5 5 Chapter 6 Principles of Operation Printer Mechanism Operation 6 1 Power Supply Operation 6 19 Control Circuit Operation 6 22 Chapter 7 Reference Materials Connector Summary 7 1...

Page 10: ...t Data Buffer 1 13 Interfaces 1 13 Parallel Interface 1 13 Optional Interfaces 1 16 Control Panel 1 17 Buttons 1 17 Micro Feed Function 1 18 Bin Selection for the Cut Sheet Feeder 1 19 Paper Ejection 1 19 Indicators 1 20 Default Settings 1 20 Power On Default Settings 1 22 Self Test 1 22 Hexadecimal Dump 1 23 Paper out Detection 1 24 Auto Tear off 1 24 Buffer full Printing 1 24 Thermal Protection ...

Page 11: ...e 1 12 C094 MAlN Board Assembly Main Control Circuit Board 1 29 Figure 1 13 C094 PNL Board Assembly Control Panel Circuit Board 1 30 Figure 1 14 C076 PSB Board Assembly Power Supply Circuit Board 1 30 Figure 1 15 Printer Mechanism 1 31 Figure 1 16 Housing Assembly 1 32 List of Tables Table 1 1 Line Feed Speed 1 line l 6 1 4 Table 1 2 Specifications for Cut Sheets Standard Paper 1 6 Table 1 3 Speci...

Page 12: ...rs Using the LEDs l 19 Table 1 16 Group 1 Features 1 20 Table 1 17 Group 2 Features ESC P Mode 1 21 Table 1 18 Group 2 Features IBM Mode 1 22 Table 1 19 Group 3 Features Power on Settings 1 22 Table 1 20 Lever Positions 1 25 Table 1 21 Buzzer Functions 1 27 Epson FX 870 1170 1 iii ...

Page 13: ... insertion front bottom rear Dual paper park and auto load front rear 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 l 24KB input buffer l 8 character tables Italic PC437 850 860 863 865 BRASCII and Abicomp l A default setting mode replaces ...

Page 14: ...Printer Features 80 column model 1 2 136 column model Figure 1 1 External View of the FX 870 1170 Epson FX 870 1170 ...

Page 15: ...olumn Front sheet guide 80 column Front sheet guide 136 column Serial I F card Type B 32KB intelligent serial I F card Type B 32KB intelligent parallel I F card Type B Coax interface Type B Twinax interface Type B Fabric ribbon cartridge 80 column Fabric ribbon cartridge 136 column Fabric ribbon sub cartridge Roll paper holder only for 80 column model Hardware Specifications Printing Method Printi...

Page 16: ... Cut sheets Friction feed Envelopes Friction feed Labels Tractor feed Rdk Friction feed Line spacing l 6 L B or programmable l 216 minimum Table l l Line Feed Speed 1 line l Type of paper Single line feed Thin Thick Continuous feeding Thin Thick Fanfold paper Single sheet manual Cut sheet CSF ms ms 77 85 69 77 71 77 ms ips ms ips 55 3 0 66 2 5 45 3 7 55 3 0 48 3 5 55 3 0 Thin Thin paper is less th...

Page 17: ...ecause accuracy of paper feed cannot be assured Pull tractor feed l Set the release lever to the PULL position l Load the paper from the front rear or bottom entrance The front or bottom entrance is recommended for thick paper or labels l Release the friction feed mechanism l Remove the paper tension unit and attach the pull tractor unit l Insert paper from either front or bottom l Multi part pape...

Page 18: ...0 mm 136 column 7 2 10 1 182 257 mm 80 column 7 2 14 3 182 364 mm 136 column Up to 14 3 364 mm 0 0025 0 0055 0 065 0 14 mm 14 24 lb 45 78 kg 52 3 90 g m Standard copier paper Recycled paper at normal temperature and humidity levels Table 1 3 Specifications for Cut Sheets Carbonless Duplicating Paper Width front insertion Length Quality Thickness Weight Copies 7 2 10 1 182 257 mm 80 column 7 2 l 4 ...

Page 19: ...per copier paper airmail Size 2 l 2 x 15 l 6 4 x 15 l 6 4 x 17 l 6 Thickness 0 0028 0 0031 0 07 0 09 mm base paper 0 0063 0 0075 0 16 0 19 mm total Quality Standard paper Notes 1 Labels must be fanfold 2 Example of labels Avery continuous form or mini line labels 3 Labels should be used with the pull tractor front bottom or the front push tractor Notes 1 Envelopes must be inserted from the top 2 K...

Page 20: ...mm 80 column 5 8 16 5 148 420 mm 136 column fkont insertion 7 2 10 1 182 257 mm 80 column 7 2 14 3 182 364 mm 136 column T 1 J m 1 Figure 1 3 Printable Area for Cut Sheets l 0 12 3 0 mm or more when the paper width is less than 14 3 364 mm 0 9 25 mm or more when the paper width is 16 5 420 mm 136column 3 0 mm 0 12 or more 80 column Note Paper feed accuracy cannot be assured within 0 94 24 mm from ...

Page 21: ... 0 0 0 C c Printable Area Figure 1 4 Printable Area for Continuous Paper l 1 13 mm 0 51 or more when the paper width is 4 to 9 5 101 mm to 241 mm 25 mm 1 O or more when the paper width is lo 254 mm 80 columns 13 mm 0 51 or more when the paper width is 4 to 14 87 101 mm to 377 8 mm 25 mm or more when the paper width is 15 to 16 381 mm to 406 mm 136 columns EpsonFX 870 1170 1 9 ...

Page 22: ...Paper I 0 12 3 0 mm or more Note Paper feed accuracy cannot be assured within 24 mm 0 94 from the bottom edge of the paper top insertion only Ribbon Cartridge Ribbon Color Whhnn Life Cartridge type same as F X series 8750 80 column model 8755 M 136 column model 8758 Subcartridge Black 3 million characters at 14 dots character _ 1 10 EpsonFX 870 1170 ...

Page 23: ...able 1 9 Environmental Conditions Reliability MCBF Temperature Humidity Resistance to shock Resistance to vibration 5 to 350 C 41 to 95 F operating 30 to 60 C 22 to 140 F in shipment container 10 to 80 RH operating 5to85 RH non operating 1 G within 1 ms operating 2G within 1 ms non operating 0 25 G 55 Hz max operating 0 50 G 55 Hz max non operating 5 million lines excluding a printhead MCBF Mean C...

Page 24: ...Italic PC 437 850 860 863 865 BRASCII Abicomp IBM mode PC 473 865 PC Personal Computer character table Fonts Draft NLQ Roman NLQ Sans serif Table l 10 Character Size and Pitch Type of letters Pica Condensed Width Height mm1 mm1 2 1 3 1 1 05 3 1 Character pitch mm1 2 54 10 cpi 1 48 17 cpi Elite 1 7 3 1 2 11 12 cpi Condensed elite 0 85 3 1 1 27 20 cpi Table l 11 Printable Columns Type of letters Pri...

Page 25: ...alue in I I when any italic character is in the line 4 The speed for high duty printing is reduced to approximately half of each speed except for the printing speed in I Input Data Buffer 24K or OK bytes selectable with power on default settings see Pouter On Default Settings later in this chapter Interfaces This printer has a built in 8 bit Centronics parallel interface Parallel Interface Data tr...

Page 26: ... signals represent the 1st to 8th 3 21 DATA2 In bits of parallel data respectively Each 4 22 DATA3 In signal is HIGH when data is a logical 1 5 23 DATA4 In and LOW when a logical 0 6 24 DATA5 In 7 25 DATA6 In 8 26 DATA7 In 9 27 DATA8 In 10 28 ACKNLG out Approx 12 us pulse LOW indicates that data has been received and that the printer is ready to accept more data 11 29 BUSY out A HIGH signal indica...

Page 27: ...es LOW the printer controller is reset to its initial state and the print buffer is cleared This signal is normally at the HIGH level and its pulse width must be more than 50 us 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...

Page 28: ...or BUSY signal Data transfers to this printer can be carried out only after con firming the ACKNLG signal or when the level of the BUSY signal is LOW Optional Interfaces The following interface cards can be used for this printer Table 1 14 Optional Interfaces I Catalog W I Interface I C823051 Serial I F card Type B C823071 32KB intelligent serial I F card Type B C823101 32KB intelligent parallel I...

Page 29: ...inuous paper to tear off position after the printer has printed all received data and is ready to receive more print data PAPER FEED l When there is paper in the paper path Advances the paper line by line using the current line spacing setting while the printer is ready to print or paused by PAUSE button Holding down the button for about 1 second advances the paper to the next top of form TOF posi...

Page 30: ...ter is in micro feed mode l In micro feed mode PAUSE Advances the paper forward by 2 216 inch per step PAPER FEED Moves the paper backward by 2 216 inch per step Depending on the time when the micro feed is activated it will micro adjust the following positions l the loading position immediately after paper is loaded in the printer l the tear off position when paper has been advanced for tear off ...

Page 31: ...ON Tear off Blinking 75 duty Pause Blinking 50 duty Paper error Blinking 25 duty Head hot Blinking 25 duty FONT Draft OFF NLQ Roman ON NLQ Sans serif Blinking CONDENSED Normal pitch OFF Condensed pitch ON When an error occurs the READY FONT and CONDENSED LEDs are used in combination to identify the error Table 1 15 Identification of Errors Using the LEDs I All indicators Blinking simultaneously Bl...

Page 32: ... setting The READY LED shows your selection 4 Repeat this procedure for any Group 1 feature you want to change After you set the feature at the bottom of Table 1 16 the printer returns to the first feature in Table 1 16 5 When all the settings are as you want them turn off the printer The settings are stored in non volatile memory Table l 16 Group 1 Features FONT LED OFF OFF ON ON BLINKS BLINKS BL...

Page 33: ...the FONT CONDENSED and BEADY LEDs indicate the character set you want 3 Turn off the printer The settings are stored in non volatile memory Table 1 17 Group 2 Features ESC P Mode Character Table I OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON OFF OFF ON BLINKS I t a l i c U S standard setting France ON ON ON OFF ON BLINKS BLINKS BLINKS OFF ON BLINKS OFF OFF OFF ON ON ON BLINK BLINKS OFF Ger...

Page 34: ...ds press the buttons indicatedin Table 1 19 to change parameters Table 1 19 Group 3 Features Power on Settings Button PAUSE PAPER FEED FONT Feature Input buffer Draft printing speed Auto CR Betting valid p 0 or invalid p high p 0 or normal p valid p 0 or invalid p T standard factory setting Notes 1 Auto CR moves the next print position to the left margin when a LF or the ESC J code is sent 2 isone...

Page 35: ...t help messages for control panel operation l A pattern of characters as shown below Figure l 8 Self Test Printout Hexadecimal Dump Press the PAUSE button while turning on the printer to put it in hexadecimal dump mode In this mode the printer prints out the hexadecimal format for received data along with the corresponding ASCII characters This function is useful to check received data from the ho...

Page 36: ...he thermistor detects that printhead temperature exceeds 180 F 82 C the printer stops printing to protect the printhead from overheating High Duty Printing When the 35 V monitor circuit determines that printing duty is too heavy for the power supply because the line voltage has dropped the printer stops printing until the voltage recovers It then continues printing the rest of the document at half...

Page 37: ...aper is loaded the paper is ejected backward to the paper park position To feed several pages backward repeat this operation several times Adjust Lever Operation You must set the platen gap adjust lever to the proper position from the 8 steps available for the paper thickness If this lever is set to position 2 the 4th step or higher printing speed and paper feeding speed are reduced Table l 20 Lev...

Page 38: ... l 6 inch l The page length and skip over perforation settings are returned to their default values l All vertical tab positions are cleared l The horizontal tab positions are set to every 8 columns The print mode is set to the default value set fkom the control panel and stored in non volatile memory TOF position is reset in the following cases Power on l Receipt of the INIT signal or CMIXEQ opti...

Page 39: ...ent at the start of a self test A sheet could not be ejected from the CSF no Anotherpaperdetectionerroroccurred With single sheet feed selected no paper is present Illegal paper release unrelease Recognition of l operation Continuous paper can t be loaded Paper runs out after the PAPER FEED button is pressed continuously till corrected The release lever was changed while there was paper in the pap...

Page 40: ... main components are l C094 MAIN board assembly l C094 PNL board assembly l C076 PSB board assembly l Printer mechanism l Housing assembly The following figure shows the main components of the FX 870 1170 Platen Gap Adjust Lever Release Lever Pril B Board Assembly IN Board Assembly iter Mechanism 1 28 Figure 1 11 Main Components Epson FX 870 1170 ...

Page 41: ...trols all the main functions of the printer It consists of a TMP90C041F 8 bit CPU an E05A55YA gate array an E2PROM a PSRAM a MASK ROM motor drivers and head drive transistors PF MOTOR DRIVER CPU DAld lfil l TM p CTRr CR MOTOR E2PROM 1 o q I M A S K R O M HEAD DRIVE GAiE ARRAY TRANSISTORS E05A66YA Figure 1 12 CO94 MAIN Board Assembly Main Control Circuit Board I F Epson FX 870 1170 1 29 ...

Page 42: ...cator LEDs Figure 1 13 CO94 PNL Board Assembly Control Panel Circuit Board CO76 PSB Board Assembly 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 Figure 1 14 CO76 PSB Board Assembly Power Supply Circuit Board 1 30 Epson FX 87011170 ...

Page 43: ...hanism consists of a g 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 model 80 column model Figure l 16 Printer Mechanism Epson FX 870 1170 1 31 ...

Page 44: ...r Feature8 Housing Assembly The printer mechanism and all the boards are contained in a housing assembly that consists of the upper case and the lower case 1 32 Figure 1 16 Housing Assembly Epson FX 870 1170 ...

Page 45: ...er X or XL for narrow or wide carriage What are the resident fonts are in these printers and are they scalable Draft Roman and Sans Serif The FX 870 and FX 1170 do not support Epson ESC P2 scalable fonts If the program I am running does not list the FX 870 or FX 1170 as a printer selection what other printer can I select in my software Acceptable driver selections for Epson mode are listed below i...

Page 46: ... Q A 11 Q A What is the size of the input buffer for the built in parallel interface 24K can be enabled or disabled in the default setting mode What accessories are available for the FX 870 and FX 1170 FX 870 Part No C808371 C803881 c800201 C814001 C823051 c823071 C823101 C823141 c823151 Cl 9E A 8310 FX 1170 Part No C808391 C808401 C800211 C814011 C823051 C823071 C823101 C823141 C823151 Cl 9E A De...

Page 47: ...d FX 1170 print on labels A Yes at normal temperature and humidity levels Use continuous type labels only Never back feed labels 17 Q Can the FX 870 and FX 1170 print on envelopes A Yes at normal temperature and humidity levels You can use No 6 and No 10 envelopes up to 0197 inches thick 18 Q What is the printer s duty cycle A 25 This means that out of every hour the FX 870 1170 can print continuo...

Page 48: ...er Cables 2 2 Parallel Cables 2 2 Serial Cables 2 2 Checking the Printer with the Computer 2 3 Parallel Connection to an MS DOS Computer 2 3 Serial Connection to an MS DOS Computer 2 4 Tips to Increase Printer Life 2 4 List of Figures Figure 2 1 Serial Cable Configuration to a 9 Pin Computer Connector 2 2 Figure 2 2 Serial Cable Configuration to a 25 Pin Computer Connector 2 3 Epson FX 870 1170 2 ...

Page 49: ...an 10 feet from the computer install an optional Type B serial interface a Leave adequate space around the printer for proper ventilation Avoid electrical outlets controlled by wall switches or automatic timers Accidental disruption of power can erase information stored in printer memory 0 Keep the entire computer system away from potential causes of electromagnetic interference such as loudspeake...

Page 50: ...parallel Centronics interface should be a shielded twisted pair cable no longer than 10 feet 3 meters maximum If the cable has a frame ground connector attach it to the frame ground terminal beside the parallel connector in the back of the printer See Table 1 13 for pin assignments and signal functions for the parallel interface Serial Cables If you install an optional Type B interface in the prin...

Page 51: ...Troubleshooting Parallel Connection to an MS DOS Computer Once you have connected the printer to the computer you can test the connection by send ing a print screen to the printer At the MS DOS prompt type DIR and press Enter Then press Print Screen or Shift Print Screen If the printer does not respond try modifying the MS DOS MODE command From the MS DOS directory type the following command and p...

Page 52: ...printer At the MS DOS prompt type DIR Enter Then press Print Screen or Shift Print Screen Or type DIR PRN and press Enter at the MS DOS prompt to print a listing of the current directory If you needed to change the MS DOS MODE command to reroute the computer s output to the correct port edit the system s AUTOEXEC BAT file to include this MODE command automatically Tips to Increase Printer Life Alt...

Page 53: ...or 3 19 Figure 3 5 Platen Gap Sensor 3 20 Figure 3 6 Front and Rear PE Sensors 3 20 List of Tables Table 3 1 Power Supply Test Points 3 1 Table 3 2 Sensor Test Points 3 2 Table 3 3 Motor Test Points and Coil Resistance 3 2 Table 3 4 Printhead Test Points and Coil Resistance 3 3 Table 3 5 Printhead Driver Test Points 3 4 Table 3 6 Carriage and Paper Feed Motor Driver Test Points 3 4 Table 3 7 Error...

Page 54: ...o the power source unless instructed to do so in the test When the power supply must be connected use extreme caution because the voltage may cause physical injury and may damage the components of the printer Test Points The test point tables and diagrams have been placed at the front of this chapter to provide you with a quick reference for checking motors the printhead printhead drivers sensors ...

Page 55: ...d short Closed active Meter should toggle between open and short Open active Meter Reading Meter should toggle between 0 V and HIGH Table 3 3 Motor Test Points and Coil Resistance Common Pin Numbers 5 6 5 Test Pin Numbers 1 2 3 4 1 and2 3and4 Test Method Set Meter to Ohms Disconnect Motor from Main Board and Check it with Printer Power Off Meter Reading Place one lead on pin 5 and the other lead 5...

Page 56: ...r Pin Test Pin Printhead and Check it with Number Numbers Numbers Printer Power Off Meter Reading Printhead 2 1 3 and5 Place one lead on pin 2 and the other on 16 5 I 1 6S2 test pins 1 3 and 5 to check the at 77 F resistance of printhead dots 2 4 and 6 25 C 8 4 6 and 13 Place one lead on pin 8 and the other on test pins 4 6 and 13 to check the 14 Thermistor resistance of printhead dots 7 8 and 9 1...

Page 57: ...ven are on the Not open and not shorted The typical reading on chip other Place lead on pin 4 ground and is 547 but the reading is not as important as SLA7024M lead on each of the four pins consistency PF Motor Test Method Driver El Set Meter to Diodes in Numbers Check with Printer Power Off Meter Reading 3 5 7 and Pins 1 and 10 are marked on board Place Consistent readings from all pins within f ...

Page 58: ...r beeps Paper release error The paper release lever is set to an continuously inappropriate position All indicators blink Fatal error Voltage error head thermistor error bad simultaneously RAM CPU or other fatal error All indicators blink Memory error Incorrect RAM simultaneously quickly All indicators blink High voltage error The power supply voltage is abnormal sequentially in the Use flowchart ...

Page 59: ... in the mechanism may be catching See paper feeds abnormally l Paper feed motor may be bad Chart 3 l Drier for PF on CO94 MAIN board may be bad Self test printout has poor l Platen gap may be incorrect quality l Printer may need bidirectional adjustment See l Head cable may be bad Chart 4 l Printhead may be bad l Printhead drivers on CO94 MAIN board may be bad Printing is darker on one l Platen ma...

Page 60: ...after power on l For narrow carriage printer the main board E2PROM the E2PROM call may have the wrong carriige width dealer BBS at 800 234 i 445 for Version 4 0 of Confidence Test to reprogram The FX 1170 will print only l The E2PROM on the CO94 MAIN board contains the Call dealer BBS BO columns wrong carriage width at 800 234 1445 for Version 4 0 of Confidence Test to reprogram The printer double...

Page 61: ...mpt For instance if the serial interface card s switches are in the factory setting type MODE COMn 9600 N 8 1 P n is the number of the COM port you are using The 8 parameter in the command sets the word length to 8 bits The printer l Handshaking problem Verify that computer and printer are using the outputs a couple l Cable problem same type of handshaking One cannot use of pages and BUSY READY if...

Page 62: ...es the new I 35 V at oin 10 I Measure the VP 35 V at pin 10 of CM2 on the C076 PSR board assembly 1 e c dhe board assembly I board Measure the VL 5 VI at pin 1 of CM2 on the C076 PSR No A Is the output No vo I tage Q norma I 1 Yes Disconnect CM14 and check the power supply voltages out of circuit a t pin 10 and pin 1 board assembly END v END v Epson FX 870 1170 3 9 ...

Page 63: ...isconnect connector CM1 2 and power on printer Yes initialize R g y N ha board Check motors and printhead 1 END I If shorted use Tables 3 5 and 3 6 to check drivers on C994 MAIN board and if bad replace main board at same time 1 board END 3 10 Epson FX 870 1170 ...

Page 64: ...eck the gears timing belt and belt pulley for war brmkagr objects and Coralgn Replace parts and lubrlcatr as nerdad km Chapter 5 1 Rapl8ca the Cg94 MAIN board Repl8ce CR motor I f any coil Is shorted use Table 3 6 to test CR drivers on the CW4 WIN board and If bad replaca rln b o a r d a t S W t l r END Epson FX 870 1170 3 11 ...

Page 65: ...eds Abnormally n START YOS No IR TY s No il Replace P F motor I f my coil Is shortrd use Table 3 6 to Cast PF drlvors on the CW4 WIN board and If bad raplace uln board at aaa tin roslstanca o f tha PF motor Is I t 63 l 3 INo 3 12 END Epson FX 870 1170 ...

Page 66: ...rs Are any dots 1 q lsslng or Q drrgglng No Perform thll No for bent or Chmck printhead rrslstance I f It Is not 16 5 ohms 1 6 olmr raplax t h r prlnthrad If any prlnthmd pin Is shortrd use Tablo 3 5 t o chack drlwrs QZ Q13 o n tha uln bawd and I f shorted raplace at t h e sm tlm 8s the printhead Epson FX 870 1170 3 13 ...

Page 67: ... ribbon mark rlght and l e f t does ribbon See Figure 6 21 page 6 18 Check gearing for broken or wore gears or foreign objects stuck In the gears Repface eny gears necessmy Lubricate as necessary See Chapter 5 1 And make sure gears are turning smoothly 3 14 Epson FX 87011170 ...

Page 68: ... RAIN bo8rd Chrck daf8UltS shown in the self test Are they correct for the 8ppliC8tlOn If not sat th8m correctly Sm Def8Ult Settings I n Chaptar 1 1 Exit progrv 8nd send 8 print scrmn from thm US DOS prompt R8pl8ca th8 C194 RAIN bo8rd Chock softw8re conflgurrtlon Verify prlnter opor8tion wlth other software I Note The host computer is assumed to be operating normally END Epson FX 870 1170 3 15 ...

Page 69: ... self test and chSck the printer s drf8ult settings 8gainst the settings In your 8pplic8 tlon SOftW8rS printer Th8 problv Is wlth th8 softw8ro YOS The C894 IL IN bo8rd f l y bs b8d This I s mor8 r8rS than problems with softw8rS settings 3 16 Epson FX 870 1170 ...

Page 70: ...e the following NODE LPTn 6 P and press Enter n is the port you 8r using 1 Send another print screen Disconnmt the cable At the prlntar connector you will see that the pin nmbers are Iabolod Put a piace of tape over pin 14 to block thr sIgnal f r a the p r i n t e r Epson FX 870 i 170 3 17 ...

Page 71: ...Troubleshooting Connector Locations The layout diagram below shows the positions of connectors on the C094 MAIN board R II PE Rear 3 18 Figure 3 2 Connector Locations Epson FX 870 1170 ...

Page 72: ...Troubleshooting Sensor Locations The illustrations below show the locations of sensors in the printer mechanism Figure 3 3 Release Sensor Figure 3 4 Home Position Sensor Epson FX 870 1170 3 19 ...

Page 73: ...Troubleshooting Printer Mechanism Figure 3 5 Platen Gap Sensor Rear Paper Guide Assembly 3 20 Figure 3 6 Front and Rear PE Sensors Epson FX 870 1170 ...

Page 74: ...SC EM n Turn cut sheet feeder on off select bin eject sheet 32 ESC SP n Set intercharacter space 33 ESC n Master select 35 ESC Cancel MSB control 36 ESC nl n2 Set absolute horizontal print position n nl n2 x 256 60 37 ESC n Select user defined set 38 ESC nn Define user defined characters 40 116 ESC tnn Assign character table 42 ESC mn Select graphics mode 45 ESC l O Turn underlining on off 47 ESC ...

Page 75: ...ver perforation 4F 79 ESC 0 Cancel skip over perforation 50 a0 ESC P Select 10 cpi 51 81 ESCQn Set right margin 52 a2 ESCRn Select international character set 53 83 ESC S l O Select subscriptlsuperscript mode 54 84 ESC T Cancel subscript superscript mode 55 85 ESC U l O Turn unidirectional mode on off 57 87 ESC W l O Turn double width mode on off 59 a9 ESC Y nl n2 Select high speed double density ...

Page 76: ...lect printer DC2 Select 10 pitch DC4 Cancel double width mode one line CAN Cancel line ESC l O Turn underlining on off ESC 0 Select l 8 inch line spacing ESC 1 Select 7 72 inch line spacing ESC 2 Select ESC A line spacing ESC3n Set n 216 inch line spacing ESC 4 Set top of form ESC 5 l O Set reset automatic line feed ESC 6 Enable printable characters ESC 7 Enable control codes upper ESC Select 12 p...

Page 77: ...SC l O Set skip over perforation Cancel skip over perforation Turn proportional mode on off Deselect printer Reset all tabs Select subscript superscript mode Cancel subscript superscript mode Turn unidirectional mode on off Turn double width mode on off Set left and right margins Select high speed double density graphics mode Select quadruple density graphics mode Select double height double width...

Page 78: ...tion HP Sensor 4 18 Removing the Platen Gap PG Sensor 4 18 Removing the Front and Rear Paper End PE Sensors 4 19 Removing the Release Sensor 4 20 Arranging the Cables 4 21 Disassembling the Tractor Unit 4 22 Removing the C094 MAIN Board Assembly 4 23 Removing the C076 PSB Board Assembly 4 24 List of Figures Figure 4 1 Flowchart for Disassembling the Printer 4 4 Figure 4 2 Removing the Paper Guide ...

Page 79: ... 20 Removing the PE Sensors 4 19 Figure 4 21 Removing the Release Sensor 4 20 Figure 4 22 Arranging the Cables 4 21 Figure 4 23 Disassembling the Tractor Unit 4 22 Figure 4 24 Position of the Cog 4 22 Figure 4 25 Removing the C094 MAIN Board Assembly 4 23 Figure 4 26 Special Extractor Tool 4 24 Figure 4 27 Removing the C076 PSB Board Assembly 4 24 List of Tables Table 4 1 Recommended Tools 4 1 Tab...

Page 80: ...ee Chapter 5 recommended tools for maintenance 5 Adjust the printer only as Tools Tables 4 1 and 4 2 list the recommended tools needed to disassemble assemble or adjust the printer Use only tools that meet these specifications Table 4 1 Recommended Tools Tool Part No Round nose pliers 8740400100 Nippers B740500100 Tweezers B741000100 Soldering iron B740200100 E ring holder 2 5 B740800400 Phillips ...

Page 81: ...he paper feed motor running at the 0 Checked 0 Not necessary correct temperature and not overheating Paper path Is the type of paper in the printer feeding 0 Checked 0 Not necessary smoothly Is the tractor feeding the paper correctly 0 Checked 0 Not necessary Is the paper path clear of all obstructions 0 Checked 0 Not necessary Is the platen free of damage 0 Checked 0 Not necessary Ribbon mask Is ...

Page 82: ... 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 tight screw Table 4 5 Screw Types and Abbreviations Head Body Washer assembled TOP Side Cross recessed head 1 Bind 1 tjormal 1 _Plain washer 0 0 o ooE 2 S tight Slotted head with Notch cl 2 Qutside toothed lock washer 8 2 _Pan oT d OQ __ 3 cup J 4 Iapping 3 ...

Page 83: ...ply cable from the AC power outlet Failure to do so may cause physical injury The power switch is wired in the secondary circuitry Therefore the printer s primary circuitry remains live even after the power switch is turned off CAUTION Before disassembling any part of the printer remove the paper and the ink ribbon Also disconnect the interface cable Note The flowchart below shows the order in whi...

Page 84: ... ribbon top cover front cover paper eject cover and tractor unit Figure 4 2 Removing the Paper Guide Assembly 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 Epson FX 870 i 170 4 5 ...

Page 85: ...h the two clips on the bottom of the panel unit and remove the panel unit 3 Remove the flexible flat cable FFC Figure 4 3 Removing the Panel Unit Assembly Note The FFC cable must be connected properly as shown below Plain Face FFC Cable 1 5 Face with exposed terminals at the end of the cable Figure 4 4 Connecting the FFC Cable to the Panel Unit 4 6 Epson FX 870 1170 ...

Page 86: ...ide assembly ribbon top cover front cover paper eject cover and tractor unit See page 4 5 2 Remove the two CBS M3x8 screws from the printhead lift the printhead up and remove the FFC cable 3 Remove the printhead FFC Figure 4 5 Removing the Printhead Epson FX 870 1170 4 7 ...

Page 87: ...using assembly There are only three screws in the 80 column printer 4 Use a small screwdriver to 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 upper housing assembly 5 Remove the upper housing assembly Upper Housing Assembly CBC M4X15 cut _ Hooks Screwdriver Figure 4 6 Removing the Upper Housing Assembly Note ...

Page 88: ...he four CBB M4x12 screws securing the printer mechanism Remove the CBS M3x6 screw securing the interface cover Disconnect the following connectors on the MAIN board assembly CN3 a pin BLUE CN4 a pin WHITE CN5 2 pin BLACK CN6 6pin BLACK CN7 a pin YELLOW CN8 lCpin FFC cable CN9 pin WHITE CN12 lo pin control panel and CN13 5 pin WHITE Remove the printer mechanism CBB k4X12 Interface Cover Printer Mec...

Page 89: ...g assembly See page 4 8 4 Remove the two CBS M3x8 screws securing the platen cover 5 Disengage the teeth of the platen shaft holders and rotate them Then slide the left platen sh holder to the left 6 Remove the platen knob 7 Remove the ribbon mask by pushing the two clips 8 Slide the platen assembly and remove it Platen Knob CBS M3X8 Platen Cover Platen Shaft Holder Figure 4 8 Removing the Platen ...

Page 90: ...ring the left frame of the printer mechanism and the nut and washer securing the adjust lever Remove the parallelism adjustment bushing Remove the left frame 7 Remove the FFC cables from the right frame of the printer mechanism and then the two CBS M3x8 screws securing the right frame 8 Remove the rear frame assembly 9 Push the clip on the back of the rear frame assembly Slide out the rear frame H...

Page 91: ...sengage the timing belt from the CR motor assembly and hang it on the hook 5 Disconnect connector CN13 on the C094 MAIN board assembly Remove the CR motor assembly 6 Remove the two CBN M3x6 screws on the back of the CR motor assembly Remove the CR motor assembly Face Screw M3X7 CR Motor Assembly Belt Tension Plate hi LCBN W3X8 Figure 4 10 Removing the CR Motor Assembly Assembly Note Position the C...

Page 92: ...emove the upper housing assembly See page 4 8 4 Remove the printer mechanism See page 4 9 5 Set the release lever to the vertical or forward position 6 Remove the FFC cables and then the two CBS M3x8 screws securing the PF motor assembly 7 Remove the PF motor assembly Lever Positions This position does not release the PF motor assembly M3X8 Figure 4 12 Removing the PF Motor Assembly Epson FX 870 1...

Page 93: ...sm See page 4 Q 5 Remove the CR motor assembly See page 4 12 6 Remove the PF motor assembly See page 4 13 7 Remove the FFC cables from the right sub fkame of the printer mechanism and then remove the two CBS M3x8 screws securing the right sub frame 8 Remove the right sub frame Figure 4 13 Disassembling the PF Gear Train Assembly Note Be sure to mesh the release lever with the mechanism properly Fi...

Page 94: ...ly See page 4 8 Remove the printer mechanism See page 4 9 Remove the platen assembly See page 4 10 Remove the left frame of the printer mechanism See page 4 11 Disengage the timing belt from the CR motor assembly See page 4 12 Release the timing belt from the two clips at the bottom of the carriage assembly Move the carriage assembly to the CR motor assembly Remove the carriage assembly from the r...

Page 95: ... the timing belt to the carriage assembly secure the timing belt using the 1eR and right clips of the carriage assembly as shown below Make sure there is no slack in the timing belt Clip Timing Figure 4 16 Attaching the Timing Belt 4 16 Epson FX 870 1170 ...

Page 96: ... 4 8 4 Remove the printer mechanism See page 4 9 5 Remove the platen assembly See page 4 10 6 Remove the left frame of the printer mechanism See page 4 11 7 Disengage the timing belt from the CR motor assembly See page 4 12 8 Remove the carriage guide assembly See page 4 15 9 Remove the CBC M3x8 screw and the CBB M3x8 screw securing the RD assembly 10 Remove the RD assembly CBC M3X8 RD Assembly Fi...

Page 97: ... Removing the Platen Gap PG Sensor 1 Remove the paper guide assembly ribbon top cover front cover paper eject cover and tractor unit See page 4 5 2 Remove the panel unit See page 4 6 3 Remove the upper housing assembly See page 4 8 4 Remove the printer mechanism See page 4 9 5 Remove the two clips of the PG sensor attached to the left frame of the printer mechanism Remove the sensor 6 Disconnect t...

Page 98: ...e page 4 6 3 Remove the upper housing assembly See page 4 8 4 Remove the printer mechanism See page 4 9 5 Remove the platen assembly See page 4 10 6 Remove the rear frame assembly See page 4 11 7 Remove the clip for each PE sensor mounted on the rear paper guide assembly Remove the front PE sensor and rear PE sensor 8 Remove the lead from each PE sensor Figure 4 20 Removing the PE Sensors Epson m ...

Page 99: ...6 Remove the upper housing assembly See page 4 8 Remove the printer mechanism See page 4 9 Remove the platen assembly See page 4 10 Remove the rear frame assembly See page 4 11 Remove the two clips for the release sensor mounted on the rear paper guide assembly Remove the release sensor 8 Disconnect the release lead from the sensor Release Sensor Figure 4 21 Removing the Release Sensor 4 20 Epson ...

Page 100: ...isassembly and Assembly Arranging the Cables When you assemble the printer arrange the cables as shown in Figure 4 22 El Printer Mechanism Bottom W Figure 4 22 Arranging the Cables Epson FX 8700170 4 21 ...

Page 101: ...r frame from the tractor shaft and the tractor guide shaft 4 Remove the E ring from the tractor shaft 5 Remove the right tractor the paper support unit and the left tractor from the tractor shaft and tractor guide shaft Tractor Guide Shaft Tractor Shaft Figure 4 23 Disassembling the Tractor Unit Assembly Note When reassembling the tractor unit be sure to snap the clips for cog 17 onto the tractor ...

Page 102: ...m connector CN2 on the C076 PSB board assembly Remove I F support from the C094 MAIN board assembly Remove the two CBS M3X12 screws securing the cover for the optional interface card Remove the CBC M3X8 screw and the five CBB M3X12 screws securing the C094 MAIN board assembly Remove the I F grounding plate Remove the C094 MAIN board assembly I F Support CBC M3X8 CO94 MAIN Board Assembly I F Grouna...

Page 103: ...sink attached to the FET Ql when the printer is powered on If you touch the heat sink you may suffer from electric shock 1 Remove the paper guide assembly ribbon top cover front cover paper eject cover and tractor unit See page 4 5 2 Remove the panel unit See page 4 6 3 Remove the upper housing assembly See page 4 8 4 Remove the printer mechanism See page 4 9 5 Remove the three CBB M3x12 screws an...

Page 104: ...Disassembly and Assembly CBC M3X8 CBB M3X12 C076 PSB Board Figure 4 27 Removing the C076 PSB Board Assembly Assembly Epson FX 870 1170 4 25 ...

Page 105: ... Adjustment Procedure 5 3 Adjustment Operation 5 4 Preventive Maintenance 5 5 Lubrication 5 5 List of Figures Figure 5 1 Removing the Ribbon Mask 5 1 Figure 5 2 Parallelism Adjustment Bushing 5 2 Figure 5 3 Platen Gap 5 2 Figure 5 4 Bidirectional Alignment Adjustment Draft Mode 5 4 Figure 5 5 Bidirectional Alignment Adjustment NLQ Mode 5 4 Figure 5 6 Lubrication Points 5 7 List of Tables Table 5 1...

Page 106: ...he printhead 1 Remove the printer mechanism from the lower case See page 4 9 2 Remove the printhead from the carriage See page 4 7 3 Use tweezers to remove the ribbon mask from the carriage Ribbon Mask 4 5 6 7 8 Figure 5 1 Removing the Ribbon Mask Remount the printhead on the carriage Set the adjust lever to the 0 setting second step position from the rear Move the release lever back to the FRICTI...

Page 107: ...lumn printer 11 Use the 7 mm box driver to rotate the parallelism adjustment bushing on the right frame of the printer mechanism 12 Rotate the adjustment bushing until the platen gap is large enough for a 0 36 mm thickness gauge but too narrow for a 0 40 mm thickness gauge 13 Move the printhead back to the 5th column print position again Check the platen gap with the thickness gauge It should stil...

Page 108: ... 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 printer mechanisms are manufactured exactly the same the bidirectional alignment correction differs for each print...

Page 109: ...m to the left The adjustment value increases by the shifted amount l If the even numbered lines are shifted to the left press the PAPER FEED button to shift them to the right The adjustment value decreases by the shifted amount Press the PAUSE TEAR OFF button when you finish the draft mode adjustment The printer enters the NLQ mode and prints an adjustment value and four lines of the H character S...

Page 110: ...r from the external AC power source before performing maintenance Lubrication Epson recommends that the printer be lubricated at the points shown in Figure 5 2 Table 5 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 5 1 describes the lubricants Before applying lubricant be s...

Page 111: ... the left frame excluding G 26 the two slots at the bottom 2 The arms and tab of the RD assembly G 26 d 3 The shaft end of the drive roller assembly 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 tractor clutch cam G 26 7 The cam end of spur gear 34 5 G 26 5 6 Epson FX 870 1170 ...

Page 112: ......

Page 113: ...e Motor Drive Circuit 6 27 Paper Feed Motor Drive Circuit 6 28 Printhead Drive Circuit 6 29 Parallel Interface Circuit 6 29 E2PROM Control Circuit 6 30 Component Repair Information for Dealers Outside the U S 6 31 Repairing the C076 PSB Board Assembly 6 31 Repairing the C094 MAIN Board Assembly 6 34 List of Figures Figure 6 1 How the Printhead Works 6 2 Figure 6 2 Carriage Operation 6 3 Figure 6 3...

Page 114: ... the Front Entrance 6 16 Figure 6 19 Paper Path for pull Tractor Feeding Using the Front Entrance 6 17 Figure 6 20 Paper Path for Push pull Tractor Feeding Using the Front Entrance 6 17 Figure 6 21 Ribbon Advance Mechanism 6 18 Figure 6 22 Power Supply Circuit Block Diagram 6 21 Figure 6 23 Control Circuit Block Diagram 6 22 Figure 6 24 Data Flow 6 23 Figure 6 25 Power On Reset Circuit 6 25 Figure...

Page 115: ...Principles of Operation Table 6 6 Carriage Motor Drive Modes 6 27 Table 6 7 Repairing the C076 PSB Board Assembly 6 31 Table 6 8 Repairing the C094 MAIN Board Assembly 6 34 Epson FX 870 1170 6 iii ...

Page 116: ...d Mechanism The printhead mechanism consists of the printhead itself the ink ribbon and the platen The printhead contains a column of 9 wires Each of these wires has a drive coil which causes the wire to move in and out of the printhead to print each dot The three steps below describe how these driving wires work 1 The control circuit outputs drive signals to the printhead drive circuit This chang...

Page 117: ... Dot Wire Wire Resetting Spring lnlxl Actuating Plate 7 Actuating Plate Spring Figure 6 1 How the Printhead Works The printhead tends to heat up after a period of continuous printing To minimize the dot wire drive coil s 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...

Page 118: ...ead installed the carriage moves in either direction along the carriage guide shaft The carriage CR motor a stepping motor drives the timing belt which moves the carriage The home position HP sensor detects the home position of the carriage Pulley Timing Belt I CR Motor Figure 6 2 Carriage Operation Epson FX 870 1170 6 3 ...

Page 119: ...oves the 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 the printer to protect the printhead The platen gap PG sensor detects the position of the adjust lever The correct platen gap is 0 38 mm f 0 02 mm with the adjust lever set to posit...

Page 120: ...ull 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 are used f...

Page 121: ...ear 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 6 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 and free the paper by ...

Page 122: ...aten gear and the gear train in the front part 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 gear train In the push tractor method the release ...

Page 123: ...Operation Paper Continuous Paper Tension Roller Paper Tension Roller Gear Platen Gear PF Motor P h Tractor Push Tractor Gear Figure 6 6 Push Tractor Operation Using the Front Paper Entrance 6 8 Epson FX 870 I 170 ...

Page 124: ...stalled at the paper exit and pulls the paper out of the printer mechanism As the result the paper tension unit is not required Figure 6 7 illustrates pull tractor operation when the paper is fed through the bottom paper entrance Paper Continuous1 II Tractor Gear Reduction Gear Paper Drive PF Motor P Paper Advance Reduction Gear Paper Drive Roller Gea Platen Gear Figure 6 7 Pull Tractor Operation ...

Page 125: ...e paper through the printer mechanism Figure 6 8 illustrates push pull tractor operation when the paper is fed through the rear paper entrance Figure 6 9 illustrates push pull tractor operation when the paper is fed through the front entrance Paper Continuous Pull Tractor Pull Tractor Gear Push Tractor Push Tractor Gear Tractor Reduction Gear PF Motor Pinion Gear fiF Motor Paper Advance Reduction ...

Page 126: ...er ctor Reduction PF Motor Pinion Gear Gear PF Motor PaDer Advance Reduction Gear l l Platen Gear Paper Drive Roller Gear ush Tractor Gear Push Tractor Figure 6 9 Push pull Tractor Operation Using the Front Paper Entrance Epson FX 870 1170 6 11 ...

Page 127: ... the paper guide rollers are separated from the platen When it is set to the paper free position the paper drive roller and the lower paper guide roller at the front entrance are separated from each other Figure 6 10 illustrates the release lever Figure 6 11 shows the function of each release lever setting Right Paper Frame Guide Rollers Release Lever Release Shaft Release Sensor Figure 6 10 Relea...

Page 128: ...located in front of the printer mechanism and the rear PE sensor is located behind the printer mechanism Top Entrance Figure 6 12 shows the paper path for friction feeding using the top entrance The top entrance is used only for the friction feed method When the top entrance is used the rear PE sensor senses when paper is out Paper Cut Sheet Paper Tension Roller Printhead Paper Guide Rollers Figur...

Page 129: ...ctor feed pull tractor feed or the push pull tractor feed When the rear entrance is used the rear PE sensor senses when paper is out Paper Continuous Prlnth Paper Tension Roller Pap Guide Rollers Figure 6 13 Paper Path for Push Tractor Feeding Using the Rear Entrance Paper Continuous Printhead Paper ide Rollers Figure 6 14 Paper Path for Pull Tractor Feeding Using the Rear Entrance 6 14 Epson FX 8...

Page 130: ... 16 shows the paper path for tractor feeding using the bottom entrance The bottom entrance is used only for pull tractor feeding When the bottom entrance is used the front PE sensor senses when paper is out Paper Figure 6 16 Paper Path for Pull Tractor Feeding Using the BottomEntrance Epson FX 870 1170 Tractor Paper Continuous Front PE Sensor Lower Paper Guide Roller 6 15 ...

Page 131: ... or push pull tractor feed When the front entrance is used the front PE sensor senses when paper is out Paper Continuous Paper Paper Tension Roller Front PE Sensor Lower Paper Guide Roller Figure 6 17 Paper Path for Friction Feeding Using the Front Entrance Paper Continuous Paper Paper Tension Roller ower Paper Guide Roller Push Tractor Figure 6 18 Paper Path for Push Tractor Feeding Using the Fro...

Page 132: ...Paper Guide Roller Figure 6 19 Paper Path for Pull Tractor Feeding Using the Front Entrance Paper Drive Roller Front PE Sensor Tower Paper Guide Roller Push Tractor Figure 6 20 Paper Path for Push pull Tractor Feeding Using the Front Entrance Epson FX 870 1170 6 17 ...

Page 133: ...Table 6 2 Ribbon Advance Gear Linkage Direction of Carriage Movement Gear Linkage Left to right Belt driven pulley 3 Gear 1 Gear 2 3 indicated bv the black arrow Ribbon driving gear Right to left Belt driven pulley ti Gear 1 c3 Gear 3 indicated by the white arrow G e a r 4 C Ribbon driving gear The ribbon brake spring attached to the exit slot of the cartridge case prevents slack in the ribbon and...

Page 134: ...r drive PF paper feed motor drive Printhead drive 5 v Main control board logic circuitry Sensors Control panel LEDs PF paper feed motor hold Power Supply Circuit Operation Figure 6 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 ...

Page 135: ...den voltage drop that may be caused by a short circuit in the secondary circuitry of the 35 VDC line Ifa voltage drop is detected it stops the operation of the switching circuit and then the output of the 35 VDC voltage An external switch is used to turn printer power on or off When the power switch is turned off the switching circuit is de energized and the output of the 35 VDC voltage is stopped...

Page 136: ...t Circuit i I Circuit I I t 5v Switching Regulator 5v Over Current Control Circuit 5v _ P h o t o 35 V Line coupler Detector Circuit I ZD51 t 35 V Line Voltage Overload Protection Circuit 2052 I J 9 35 VDC 4 5 V D C L Voltage Drop Protection Circuit Power Switch Figure 6 22 Power Supply Circuit Block Diagram Epson FX 870 1170 6 21 ...

Page 137: ... management functions that control the memory assignment and J O areas The output signals fkom each detector are sent to the analog input port 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 6 23 shows the contr...

Page 138: ...st computer to the printhead Data sent fkom the host computer is converted to image data and transmitted to the printhead through the gate array CPU I Host computer Image data transfer L IGate Array EOSABGYA RAM Input buffer Figure 6 24 Data Flow Epson FX 87W1170 6 23 ...

Page 139: ...atato the printhead drive circuit Also controls various printer mechanism parts such as the motors E05A66YA IC4 PROM iC3 RAM iC2 E2PROM XI This gate array mainly performs the following five functions l Memory management l Centronics I F control l Control panel control l E2PROM control l Printhead drive circuit control The PROM contains the program that runs the CPU The RAM contains the CPU working...

Page 140: ...he DISC 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 6 25 shows the power on reset circuit GA IC4 3...

Page 141: ... for a while As soon as the voltage recovers the printer starts to print at halfspeed The PF motor also slows down The Vref circuit supplies 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 temperature drops to a certain level When the printhead te...

Page 142: ... to the ports L M HOLD on the SLA7024M The SLA7024M sets the coil current depending on 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 IC2Cl P60 P61 P62 P63 SLA7024M IC6 CR MOTOR ASSEMBLY 4 phase 200 p HB ...

Page 143: ...otor is output through these ports PFA to PFB are turned on or off within the pPA1476H ICl depending on the phase data sent from the CPU When there is an output at A19 of the CPU a 36 V voltage is supplied to the PFCOM terminal of the PF motor Otherwise a 6 V voltage is supplied through Dl to hold the motor CPU UPAl476H ICl PF MOTOR 4 phase 48 p PM type pulse motor 36 VDC i 10 61 a 3 fi per phase ...

Page 144: ...ad Drive Circuit Parallel Interface Circuit The parallel interface circuit controls the data flow from the host computer When am signal is sent from the host computer the data is latched into the gate array E05A66YA Data is transmitted until a BUSY signal is sent back automatically to the host computer to stop the data Then the gate array outputs an B8 signal to P82 the interrupt signal port of th...

Page 145: ...non volatile memory containing information such as the top of form position Because the E2PROM is a serial I O device the gate array converts the parallel data sent fiorn the host computer into serial data SCL B5A66YA IC4 CPU IC2Cl Data Bus SCK SDA SDA Figure 6 31 EZPROM Control Circuit 6 30 Epson FX 870 1170 ...

Page 146: ... information for each component of the C076 PSB WARNING The OPERATE button on the control panel only turns the secondary power circuit on or off so the primary power circuit is live 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 6 7 Repairing the C076 PSB Board Assembly Problem Cause The 35 V line is Dio...

Page 147: ...ontinued Problem cause Checkpoint Solution The voltage of the Q3 ICl PCl Check the voltage waveforms at Q3 Replace Q3 t35 V line is below PC2 or ZD51 is ICl PCl the specified value bad PC2 or zD51 Q2 is bad Check the voltage waveforms at Q2 Replace Q2 6 32 Epson FX 870 1170 ...

Page 148: ...olution he 5 V line is The 35 V line is Check the 35 V line Refer to the ad bad items described above IC51 is bad Check the oscillation waveform IC51 pin 5 and the Replace switching waveform IC51 pin 8 IC51 Q51 or Q52 is bad Check the switching waveform at Q52 emitter Replace Q51 or Q52 Epson FX 870 1170 6 33 ...

Page 149: ...mponent of the C094 MAIN board Table 6 8 Repairing the C094 MAIN Board Assembly Problem Symptom 4bnormal The CPU weration at does not rower on operate properly Cause The reset circuit is defective Checkpoint Solution Check the voltage waveforms of the VDD 5 V Replace Ic4 IC4 pin 41 and ROUT IC4 pin 15 when the power is turned on The control Check HIGH LOW alternation for the Replace ROM is not sig...

Page 150: ...n at does not power on operate properly The CPU is Check the oscillator signal IC2Cl pin 27 or If the signal is defective pin 28 not correct replace IC2Cl Otherwise replace CRl Carriage The IC6 is Check the input signal pin 5 and the output Replace IC6 operation carriage defective waveform pin 8 abnormal does not operate at all Epson FX 870 1170 6 35 ...

Page 151: ... Replace IC4 printing does not print defective and pin 63 output abnormal the self test Self test printing abnormal A particular dot fails to print One of the Check the head drive signal at the base and If the signal head driie the emitter of each transistor at the base transistors is normal is defective replace the QZ 4 5 transistor 6 8 9 10 Otherwise 11 or 12 replace IC4 6 36 Epson PX 870 1170 ...

Page 152: ... ICl is Check the input signal pin 2 and the output Replace ICl abnormal does not feed defective waveform pin 3 the paper at all or the paper feed is irregular Incorrect Data is Either IC4 or printing of corrupted IC5 is data sent when the defective from the p a r a l l e l host interface is computer used Replace IC4 or IC5 Epson FX 87011170 6 37 ...

Page 153: ...sembly Component Layout 7 12 Figure 7 10 FX 870 Case Outline Drawing 7 13 Figure 7 11 FX 1170 Case Outline Drawing 7 14 List of Tables Table 7 1 C094 MAIN Board Connector Summary 7 2 Table 7 2 CN2 Optional I F C094 MAIN Board Assembly 7 3 Table 7 3 CN3 Front PE Sensor C094 MAIN Board Assembly 7 3 Table 7 4 CN4 Release Sensor C094 MAIN Board Assembly 7 3 Table 7 5 CN5 PG Sensor C094 MAIN Board Asse...

Page 154: ...components Table 7 1 summarizes the functions and sizes of the connectors AC IN 7 4 CNl CN2k CO76 PSB BOARD ASSEMBLY L I CO94 MAIN BOARD ASSEMBLY 1 1 CN4 t 1 CN6 1 iiq 1 CN13 1 I I I PRINTER MECHANISM IPF MOTOR ASSEMBLY t I CO94 PNL BOARD ASSEMBLY I Figure 7 1 Cable Connections Epson FX 870 1170 7 1 ...

Page 155: ...N7 CN8 CN9 CN12 CN13 CN14 Function Host Computer 36 Optional Interface 36 Front PE Sensor 2 Blue Release RL Sensor 2 W h i t e Gap PG Sensor 2 Black PF Motor Assembly 6 Home Position HP Sensor 2 Yellow Printhead 14 Rear PE Sensor 3 CO94 PNL Board Assembly 10 CR Motor Assembly 5 CO76 PSB Board Assembly 11 Pins 7 2 Epson FX 870 1170 ...

Page 156: ...ead Request Write Read Chip Select Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Address Bus Blt 3 Address Bus Bit 2 Address Bus Bit 1 Address Bus Bit 0 Data Bus Bit 7 Data Bus Bit 6 Data Bus Bit 5 Data Bus Bit 4 Data Bus Bit 3 Data Bus Bit 2 Data Bus Bit 1 Data Bus Blt 0 No l O Signal Name Function 1 GND Signal Ground 1 2 1 I 1 PEF 1 Front Paper End 1 Table 7...

Page 157: ...c789 Head Drive Common 9 0 TMP Head Temperature 10 0 HDl Head Data 1 11 0 HD3 Head Data 3 12 0 HD5 Head Data 5 13 0 HD7 Head Data 7 14 0 Cl35 Head Driie Common Table 7 9 CNO Rear PE Sensor CO94 MAIN Board Assembly No l O Signal Name Function 1 GND Signal Ground 2 I PER Rear Paper End 3 I LED Paper End LED Table 7 10 CN12 Control Panel CO94 MAIN Board Assembly No l O Signal Name Functlon I I1 I I 0...

Page 158: ... 0 B OTC1132 sE IOK I A I II II III I Il IIl II IIIIII II Head Conrrol IIm O Ill i Pf Molar Control CNL LE ER CYS G P CN3 PEFRNT CNS PERAEFI Pf Motor Ower Figure 7 2 C094 MAIN Board Assembly Circuit Diagram Annotated 7 5 Epson FX 870 1170 ...

Page 159: ...Reference Materials I Figure 73 C094 MAIN Board Assembly Circuit Diagram 7 6 Epson FX 87CY1170 ...

Page 160: ...C250V FG R4 o 3gs R7 16K _ iV Over I CB T 220Op lKV _ 3 ZJI X1 HEAT SINK I P 051 9 FMP G125 t5V DC Reourator Clrcult LPZOl 2R5SO R RW II tection I I C58 O Olu 1 I 7 ct 42 PSC 35V O A I F F SV I OA 3 Psc PO 7 A F F 5V l OA c57 1 L7OOp IKV Or 7 FG C076 PSB Power Supply Board ...

Page 161: ...V I t F G I L2 2200p lKV _ 3 R5 lOK 2w Cl2 01 L70pRKV AGOI _ 2 C r CSl 33ooun1 5ov C52 33oou 5 o v a_ C 5 6 2 2 o o p 1 KV z p 22 dP Tt i F G ELF160290M 2 O Z2u AC250V 1 c 57 1 A7oOp 1KV F G I Fl 2 5A 125V l HEAT SINK N 100 120VAC CO76 PSB Power Supply Board ...

Page 162: ...PER FEED t h 0 F O N T rPAUSE l OFF CONDENSED FONT STATUS o7 SW3 0 o6 ij L SW2 0 5 LED3 N 0 4 1 1 LED2 N I 2 L I LED1 N 41 Note The STATUS LED is not implemented in this model Figure 7 6 CO94 PNL Board Assembly Circuit Diagram Epson FX 870 1170 7 9 ...

Page 163: ...onent Layouts PF Motor e m PF Motor Parallel hlterface CNl PG Sensor c cN5 Ett C N 7 PE Rear i PE Front EY Y I I Printhead P iead zeyi Drivers EN3 C N 1 2 CN2 Figure 7 7 CO94 MAIN Board Assembly Component Layout z Rm 7 10 Epson FX 870 1170 ...

Page 164: ...Reference Materials n EEm EPS I I MODEL 1 Figure 7 8 CO76 PSB Board Assembly Component Layout Epson FX 870 1170 7 11 ...

Page 165: ... fi L2DJ cl LLD I cl I I I CO94 PNL Sw2 A S S Y 2 0 0 6 1 6 0 0 0 I I q 0 FL i 16 I A 4 SW4 SW3 SWI CMK 54x1 Am Note The STATUS LED is not implemented in this model Figure 7 9 CO94 PNL Board Assembly Component Layout 7 12 Epson F 870 1 170 ...

Page 166: ...Reference Mater Outline Drawings I r I 380 I I I I i I Figure 7 10 FX 870 Case Outline Drawing Epson FX 870 1170 7 13 ...

Page 167: ...Reference Materials I L I r r I I r 01 z Figure 7 11 F X 1170 Case Outline Drawing 7 14 Epson FX 870 1170 ...

Page 168: ...sses vii adjust 4 1 lever 1 24 3 2 4 11 5 1 6 4 adjustment 3 6 4 1 5 1 5 2 5 3 bushing 4 11 5 1 5 2 airmail 1 7 alignment 5 3 ALT 1 18 1 19 Amphenol 1 13 analog input port 6 22 assembly 4 1 through 4 25 auto CR 1 22 LF 1 20 3 7 loading 1 1 tear off 1 20 1 24 AUTOEXEC BAT 2 4 B base 3 4 6 36 baud rate 3 8 beeps 1 20 1 22 1 27 3 5 belt driven pulley 6 18 bidirectional adjustment 3 6 5 3 bidirectiona...

Page 169: ...n 2 2 2 3 3 8 connections 7 1 cam 5 6 carbon 1 5 carbonless 1 5 1 6 carriage 3 2 3 6 3 7 3 11 4 15 4 16 5 6 6 35 error 1 27 3 5 guide shaft 6 3 6 4 5 1 3 6 home 1 26 3 2 3 6 3 7 3 19 4 18 6 4 6 26 7 3 mechanism 1 31 6 1 6 3 motor 1 31 3 4 3 6 4 12 6 19 6 24 6 27 7 4 drive circuit 6 27 drivers 3 4 operation 3 6 width 3 7 case 7 13 7 14 Centronics 1 13 1 34 2 2 character pitch 1 12 1 20 sets 1 12 si...

Page 170: ... 1 26 2 1 3 2 3 6 3 7 3 19 4 18 6 3 6 4 6 26 7 3 HP sensor 1 26 3 2 3 6 3 7 3 19 4 18 6 26 7 3 motor 1 31 3 4 3 6 4 12 6 19 6 24 6 27 7 4 drive circuit 6 27 drivers 3 4 current adjustment value 5 4 default settings 1 20 print position 1 18 cut sheet feeder 1 1 1 3 1 19 cut sheets 1 1 1 8 1 17 6 5 D data dumps 1 23 3 21 3 23 flow 6 23 transmission 3 7 DC current 6 19 dead 3 6 3 9 3 10 decibel level...

Page 171: ...agnetic interference 2 1 elite 1 1 1 12 emitter 3 4 6 36 emulation 1 20 entrance paper 6 6 through 6 11 6 13 through 6 17 envelopes 1 4 1 6 environmental conditions 1 11 error 1 19 1 27 3 7 3 8 codes 3 5 status 1 14 ESC P 1 21 commands 3 21 3 22 mode 1 12 1 21 excitation phase 6 27 exploded diagram 5 7 extractor tool 4 24 F factory setting 1 18 1 20 1 27 3 7 3 8 fanfold 1 4 1 7 fatal error 1 19 1 ...

Page 172: ...ll wave rectification 6 19 fuse F1 6 19 rating 6 19 FX 850 1050 1 1 1 33 FX 86e 286e 1 1 1 33 G gap 1 25 3 2 3 6 4 18 5 1 5 2 5 6 6 4 6 26 adjustment 3 6 4 1 5 1 5 3 sensor 3 20 4 18 6 4 7 3 garbled print 3 7 gate array 6 22 6 24 6 29 6 30 gauge 4 1 5 2 gear arrangement 5 3 linkage 6 18 train 4 14 6 7 6 18 Germany 1 21 graphics 3 8 grease 5 5 ground 2 2 3 1 3 4 group 1 features 1 20 2 features 1 2...

Page 173: ...umidity 1 6 1 7 1 11 I I F 1 3 1 13 1 16 1 34 2 1 3 6 3 7 3 8 6 29 7 3 card 1 11 1 3 3 7 3 8 4 23 grounding plate 4 23 support 4 23 IBM commands 3 23 3 24 mode 1 12 1 21 1 22 Proprinter 1 20 illegal paper 1 27 image data 6 23 6 24 6 29 incorrect RAM 1 19 3 5 indicators 1 17 1 19 1 27 3 5 infinite retries 2 3 2 4 3 8 INIT signal 1 26 6 25 initialization 1 20 1 26 input buffer 1 1 1 13 1 15 1 17 1 2...

Page 174: ... 1 5 5 points 5 7 M main board 1 28 1 29 3 6 3 7 3 18 4 9 4 23 6 22 6 24 6 34 6 35 6 36 6 37 circuit diagram 7 5 component layout 7 10 connector summary 7 2 maintenance 2 4 5 1 5 5 6 20 margins 3 16 matrix 1 4 MCBF 1 11 memory 1 18 1 20 1 21 1 22 1 23 1 26 1 27 6 30 error 1 27 3 5 management functions 6 22 meter 4 1 reading 3 2 3 3 3 4 micro adjust 3 7 feed 1 18 1 27 microprocessor 6 22 MODE comma...

Page 175: ... 6 19 overheat 1 24 2 4 6 2 6 27 P packing material 2 1 page length 1 20 1 23 1 26 3 16 command 1 26 page size 3 7 panel unit 4 6 paper 4 4 advance 6 6 advance roller 6 7 debris 5 5 eject cover 4 5 end 1 5 3 7 sensor 1 24 3 2 3 7 3 20 4 19 6 13 through 6 16 6 26 7 3 7 4 error 1 19 1 27 3 6 3 7 feed 1 17 1 18 1 19 1 22 2 2 3 2 3 6 5 4 6 37 mechanism 1 31 6 1 motor 1 31 3 4 3 6 4 13 6 7 6 19 6 24 6 ...

Page 176: ...or 1 31 3 4 3 6 4 13 6 7 6 19 6 24 6 26 6 28 7 3 drive circuit 6 28 drivers 3 4 pinion gear 6 7 PG platen gap 1 25 3 2 3 6 4 18 5 1 5 2 5 6 6 4 6 26 lead 4 18 sensor 3 20 4 18 6 4 7 3 phase 3 2 6 27 6 28 phone numbers vii photo diode 6 26 pica l l 1 12 pin assignments 1 14 7 3 7 4 numbers 3 1 3 4 7 3 7 4 pinion gear 6 7 pitch 1 12 1 19 planetary gear 6 18 plate spring 6 2 platen 4 10 5 1 6 6 6 12 ...

Page 177: ... 3 1 3 6 3 8 4 1 4 21 life 2 4 mechanism 1 28 4 9 5 1 5 2 6 1 6 2 printhead 2 4 3 3 3 6 4 7 5 1 5 2 6 1 6 19 7 4 drive circuit 6 23 6 24 6 29 6 36 drivers 3 3 life 1 11 mechanism 6 1 temperature 1 24 problem 3 1 3 6 3 7 3 8 PROM 6 24 Proprinter 1 20 PSB board 1 28 1 30 4 23 4 24 6 19 6 31 through 6 33 circuit diagram 7 7 component layout 7 11 pull 1 1 1 5 6 14 6 15 6 17 tractor 1 4 1 7 6 5 6 9 6 1...

Page 178: ...5 6 34 command 1 26 resident fonts 1 33 resistance 3 2 3 3 values 6 31 retries 2 3 2 4 3 8 reverse feeds 1 5 1 7 1 24 RFI 1 12 R H relative humidity 1 11 ribbon 1 3 1 10 2 4 3 6 3 14 4 4 4 5 6 1 advance mechanism 6 18 roller 6 18 brake spring 6 18 drive 4 17 assembly 4 17 5 6 gear train 3 6 5 6 6 18 feed mechanism 1 31 life 1 10 mask 3 6 4 10 5 1 5 2 6 18 pressure roller 6 18 tension 6 18 right fr...

Page 179: ...0 1 23 1 35 3 6 shielded 2 2 shock 1 11 4 24 short 3 2 3 4 3 6 circuit 6 19 6 20 signal functions 1 14 7 3 single bin cut sheet feeder 1 3 site requirements 2 1 skip over perforation 1 20 1 26 slack 6 18 4 16 smoothing circuit 6 19 solenoid 6 1 solution 3 6 3 7 3 8 Spain 1 21 special tool 4 1 4 24 specifications continuous paper 1 7 cut sheets 1 6 envelopes 1 7 labels 1 7 roll paper 1 8 speed 1 13...

Page 180: ...timers 2 1 timing 1 14 5 3 belt 4 12 4 15 4 16 6 3 6 18 tools 4 1 top cover 4 5 entrance 6 6 6 13 insertion 1 8 margin 3 7 of form 1 17 1 24 tractor 6 5 6 6 clutch cam 5 6 feed 1 5 gear 6 7 guide shaft 4 22 shaft 4 22 unit 1 1 4 5 transformer coils 6 31 transistor 3 4 6 36 Twinax interface 1 3 twisted pair 1 15 2 2 Type B 1 34 2 1 2 2 U U K 1 21 unidirectional printing 1 12 unlimited retries 2 3 2...

Page 181: ...utput 6 19 overload protection circuit 6 20 range 1 11 supply 6 19 volts 3 1 Vref circuit 6 26 W wall switches 2 1 WARNING 4 1 4 4 4 24 3 1 washers 4 3 waveform 6 31 6 32 6 33 6 34 6 37 weight 1 6 1 7 1 8 2 1 6 4 width 1 6 1 7 1 9 wire 6 1 resetting spring 6 2 wires 1 3 word length 3 8 X XON XOFF 3 8 Z Zero face 1 20 Index 14 Epson FX 870 1170 ...

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