Epson U375 - TM B/W Dot-matrix Printer Technical Manual Download Page 134

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5-48

Sub-assembly F

Switch Circuit Board Assembly and Sensor Circuit Board Assembly
Attachment

Assembly

Step

Part Name

Assembly Procedure

1
2

★

Plate-Front
Switch circuit board assembly

CC (M3 x 4)

x 2

Sensor circuit board assembly

CCS-tite (M3 x 6)

x 1

• Align holes A and B in the Switch circuit board assembly with hook

C and dowel D on the Plate-Front, respectively; then fasten the board
assembly with the screws.

• Connect the C.O. sensor cable to the Sensor circuit board assem-

bly.

• Attach the Sensor circuit board assembly to the Plate-Front and

tighten the screw. Be careful not to damage the sensor when
tightening the screw.

<Checkpoint>
• Make sure to align the dowel holes in the Switch circuit board

assembly and in the Sensor circuit board assembly with the
corresponding dowels on the Plate-Front.

CONFIDENTIAL

Summary of Contents for U375 - TM B/W Dot-matrix Printer

Page 1: ...p to its topic If you wish you can increase the size of the bookmark area by dragging the dividing bar to the right Use the scroll bar on the right side of this screen to move through the text Use the zoom tools to magnify or reduce the page display Click the Find button if you want to search for a particular term However using the bookmarks is usually quicker Complete online documentation for Acr...

Page 2: ...Technical manual TM U375 U375P English 4005791 Copied Date 199 Copied by ...

Page 3: ...e to give Seiko Epson reasonable cooperation and assistance in resisting disclosure 4 You may use confidential information only for the purpose of operating or servicing the products to which the document relates unless you obtain the prior written consent of Seiko Epson for some other use 5 Seiko Epson warrants that it has the right to disclose the confidential information SEIKO EPSON MAKES NO OT...

Page 4: ...RES AND GENERAL SPECIFICATIONS CHAPTER 2 MECHANISM CONFIGURATION AND OPERATING PRINCIPLES CHAPTER 3 HANDLING AND MAINTENANCE CHAPTER 4 TROUBLESHOOTING CHAPTER 5 DISASSEMBLY CHAPTER 6 APPENDIX CHAPTER 7 TM U375P INFORMATION CONFIDENTIAL ...

Page 5: ...tions 1 7 1 3 HARDWARE CONFIGURATION 1 8 1 3 1 Main Unit Configuration 1 8 1 3 2 Main Unit Specifications 1 9 Paper feed motor 1 9 Carriage motor 1 9 Print head unit print solenoids 1 9 Paper roll near end sensor 1 9 Cut sheet sensor TOF BOF sensor 1 9 Cover open sensor 1 9 Home position sensor 1 9 Carriage motor out of phase state sensor 1 9 1 3 3 Connectors 1 9 Interface connector 1 10 Power sup...

Page 6: ...ction 1 15 Starting hexadecimal dumping 1 15 Ending hexadecimal dumping 1 15 1 4 4 Printing Operation 1 15 Sensors and printing operation 1 15 Buffer full printing 1 15 1 4 5 Other Functions 1 15 Paper load 1 15 Paper release 1 15 Clamshell mechanism 1 15 1 5 OPTIONS 1 16 1 5 1 AC Adapter PS 150 1 16 Specifications 1 16 Dimensions and weight 1 16 1 5 2 Display Device DM D101II DM D202II 1 16 DM D1...

Page 7: ...etection mechanism 2 5 Cut sheet detection mechanism 2 5 Paper roll near end detection mechanism 2 6 Cover open detection mechanism 2 6 2 2 4 Paper Feed Mechanism 2 6 Paper feed operations 2 6 Paper feed component mechanisms 2 8 Other mechanisms 2 10 2 2 5 Ribbon Feed Mechanism 2 12 Ribbon feed operation 2 12 2 2 6 Paper Roll Take Up Mechanism 2 12 Paper roll supply mechanism 2 12 Paper roll take ...

Page 8: ... 2 3 1 4 Removing the Paper Roll 3 4 3 1 5 Inserting Cut Sheet and Printing on Cut Sheet 3 4 Inserting cut sheet 3 4 Printing on cut sheet 3 5 3 1 6 Installing and Removing the Ribbon Cassette 3 5 Installing the ribbon cassette 3 5 Removing the ribbon cassette 3 6 3 1 7 Mounting the Power Switch Cover 3 6 3 1 8 Removing the Jammed Paper 3 6 3 2 MAINTENANCE 3 7 3 2 1 Periodic Checks 3 7 3 2 2 Clean...

Page 9: ... lit 4 4 4 ERROR LED is flashing 4 5 5 Paper is not loaded by pressing down paper load switch 4 5 6 Self test is not normal 4 6 7 Data from host is not printed normally 4 7 4 1 3 Troubleshooting Tables 4 8 4 2 MAJOR PART REPLACEMENT 4 13 4 2 1 Fuse Replacement 4 13 4 2 2 Print Head Unit Replacement 4 13 4 2 3 J Guide Assembly B Cutter Blade Replacement 4 13 4 3 ERROR TYPES AND COUNTERMEASURES 4 14...

Page 10: ...r Unit Assembly 5 11 H Ribbon Frame Assembly B 5 14 I Print Frame Unit Assembly B 5 17 5 3 3 Main Assembly 5 24 1 Paper Take up Drive Pulley A and Platen Holder Unit Attachment 5 24 2 Linked Lever and Fulcrum Shaft A and B Attachment 5 25 3 Intermediate Drive Roller Assembly and Guide Frame Assembly B Attachment 5 26 4 Lever Release J Attachment 5 27 5 J Guide Assembly B C Feed Belt and V Feed Rol...

Page 11: ...HOLE UNIT ASSEMBLY 5 43 5 4 1 Component Parts 5 43 5 4 2 Sub assembly 5 44 A N E Detector Unit Assembly 5 44 B Pasting Caution Seals 5 45 C Main Circuit Board Unit 5 46 D Paper Take up Gear Assembly 5 46 E Rubber Feet and Frame Ground Screw Attachment 5 47 F Switch Circuit Board Assembly and Sensor Circuit Board Assembly Attachment 5 48 5 4 3 Main Assembly 5 49 1 Main Circuit Board Unit Cables and...

Page 12: ...ent 5 56 9 Switch Panel and Cover Face Attachment 5 57 10 Document Table Cover and Paper Take up Shaft Assembly Attachment 5 58 11 Cover ROM Attachment 5 59 5 4 4 Adjustments 5 60 A Adjusting the Paper Roll Near end Detector Position 5 60 B Head Duty Control Adjustment 5 61 CONFIDENTIAL ...

Page 13: ...1 6 1 1 Main Circuit Block Diagram 6 1 6 2 MAIN CIRCUIT BOARD PARTS LAYOUT 6 10 6 3 OVERALL EXPLODED DIAGRAMS 6 11 6 3 1 Printer Mechanism Unit 6 11 6 3 2 Whole Unit 6 12 6 4 GENERAL LUBRICATION POINTS DIAGRAMS 6 12 6 4 1 Printer Mechanism Unit 6 13 6 CONFIDENTIAL ...

Page 14: ...ly Circuitry 7 6 Reset Circuit 7 7 CPU 7 7 Gate Array 7 8 Host Interface Circuit 7 10 Drawer Kick out Drive Circuit 7 10 TROUBLESHOOTING 7 11 ASSEMBLY 7 12 Whole Unit Sub assembly C 7 12 Whole Unit Main Assembly 1 7 13 APPENDIX 7 14 Main Circuit Board Diagrams 7 14 Parallel Interface Circuit Board Diagram 7 16 Main Circuit Board Parts Layout 7 17 Parallel Intrface Circuit Board Parts Layout 7 19 O...

Page 15: ...Rev B xiv TM U375 TM U375P Technical Manual Revision Sheet Revision Page Altered Item and Contents Rev A Rev B 1 7 Reliability Information CONFIDENTIAL ...

Page 16: ...on slip paper entrances from above for validation paper and from the front for slip paper Various check printing pattern Free format printing in page mode Paper load switch for easy paper roll loading Control capability for two drawers Selectable character size 7 x 9 font or 5 x 9 font Command protocol based on the ESC POSTM standard Automatic Status Back ASB function to automatically send printer...

Page 17: ... 40 columns 16 CPI continuous print ing Approx 5 4 LPS 20 columns 16 CPI continuous print ing LPS Lines Per Second CPI Characters Per Inch Note During excessive use printing stops to protect the print head In this case the actual printing speed may be slower than that listed above 1 2 2 Character Specifications Character set Alphanumeric 95 International 32 Extended graphics 128 x 8 tables space p...

Page 18: ...Ambient Temperature Original 2 ply copy 10 to 40 C 50 to 104 F Original 1 ply copy 5 to 40 C 41 to 104 F Units mm Figure 1 3 Character Size Example 7 x 9 font 1 2 3 Paper Specifications Paper type Paper roll Plain paper Pressure sensitive paper Cut sheet Plain paper Carbon copy paper Pressure sensitive paper Recommended paper Mitsubishi Paper Mills Co no carbon paper blue Upper sheet N40Hi thickne...

Page 19: ... slip paper with curls at the paper end may cause character misalignment within the area about 17 mm 67 from the paper edge Glue must not be on the bottom edge of slip paper It is desirable that the glue should be on the top edge of slip paper Choose slip paper carefully when the glue is on the right or left edge of the slip paper since paper feeding and paper insertion are affected by gluing con ...

Page 20: ...he margin into consideration when setting printing position in paper feeding direction Slip paper Paper width W 70 to 85 mm 2 76 to 3 35 Printable area X W 22 mm Units mm Figure 1 10 Slip Paper Print Area Paper width 70 to 85 mm 2 76 to 3 35 1 Paper feeding after manual cutting is not included 2 If slip paper with curls at the paper end is used character misalignment may occur within the area abou...

Page 21: ...izing time standard Ribbon cassette overall dimensions Units mm Figure 1 11 Ribbon Cassette Dimensions 1 2 8 Dimensions Weight Finish Dimensions 186 x 327 x 145 mm 7 3 x 12 9 x 5 7 W x D x H Weight Approx 4 0 kg 8 8 lbs Color Epson standard gray 1 2 9 Environmental Specifications Temperature Operation 5 to 40 C 41 to 104 F Storage 10 to 50 C 14 to 122 F excluding paper and ribbon Humidity Operatio...

Page 22: ...2 11 Certifications EMI standards FCC Class A VDE Class B F mark Safety standards UL1950 2TH D3 recognized component C UL CSA950 D3 recognized component EN60950 IEC950 2TH 5 000 000 4 000 000 3 000 000 2 000 000 1 000 000 0 Lines 0 1 000 000 2 000 000 3 000 000 Paper roll Cut sheet Lines CONFIDENTIAL TM 295 295P Technical Manual 1 2 10 Reliability Life Mechanism Print head life 7 500 000 lines onl...

Page 23: ...1 8 1 3 HARDWARE CONFIGURATION 1 3 1 Main Unit Configuration Printer mechanism Electrical circuits and components attached to the case Figure 1 14 TM U375 Main Unit Configuration CONFIDENTIAL ...

Page 24: ...level High when a paper near end is detected Cut sheet sensor TOF BOF sensor This sensor is installed in the cut sheet path It detects insertion and ejection for slip paper and insertion for valida tion paper This sensor also detects the presence of a cut sheet in the paper path Sensor type Photosensor Voltage 5 V DC 5 Input current Approx 20 mA Output level Low when a cut sheet is detected Cover ...

Page 25: ...s 2 and 5 The ON time n1 and OFF time n2 are determined by the ESC p command 0 2 Figure 1 16 Drawer Kick out Drive Signal Timing 2 Drawer open close signal The host computer can check the drawer open close status with the ESC u command Input signal level at connector pin 3 Low 0 to 0 8 V High 2 to 5 V Notes Use a shielded cable for the drawer connection It is not possible to drive two drawers at t...

Page 26: ...rinter side is fixed to 1 Connector type D SUB 25 female or equivalent Can be set with DIP switches on the bottom of the printer see Tables 1 9 and 1 10 Table 1 7 Interface Connector Specifications and Functions Pin Signal Number Name 1 FG Frame ground 2 TXD O Transmit data 3 RXD I Receive data 4 RTS O Same as DTR signal 6 DSR I Indicates whether the host is ready to receive data SPACE indicates r...

Page 27: ...a In addition the data transmitted during the receive buffer full state may be lost Example of use Set the receive buffer to 4K bytes and check the status with ESC v or ESC u for each line of printing transmit ted Make sure that the data for printing each line does not cause the printer to enter the receive buffer full state On line off line switching This printer has no on line off line switch It...

Page 28: ...PAPER FEED button Type Non locking push button Function When pushed once and released feeds paper one line by the amount set by ESC 2 and ESC 3 When pushed and held feeds paper continuously Note When the printer cover is open these buttons are active regardless of the ESC c 5 setting Paper load switch Type Non locking lever switch Function Loads a paper roll Notes This switch performs fast paper f...

Page 29: ...intout For details about the self test refer to Section 4 1 1 Self test 1 3 6 Indicators The indicators are located on the operation panel see Figure 1 1 POWER LED green On Stable power 24 V is supplied Off Stable power 24 V is not supplied ERROR LED red On Off line except during paper feeding using the PAPER FEED button Off Normal operation Blinking An error has occurred see Section 4 3 Error Typ...

Page 30: ...setting The paper roll near end and cut sheet sensors are enabled The printer operation then differs depending on the paper type as follows Paper roll mode When printing stop is selected and a paper end is detected the printer stops printing after printing current line and feeding the paper If the DIP switch 2 3 is OFF the printer goes off line To start printing close the printer cover after loadi...

Page 31: ...tion Rated output power Approx 48 W Output peak current 6 A within 10 ms Compliance to safety regulations UL CSA TÜV Dimensions and weight Dimensions 86 x 166 x 44 mm 3 39 x 6 54 x 1 73 W x D x H without protruding parts Weight 700 g 1 54 lbs excluding AC cable 1 5 2 Display Device DM D101II DM D202II The DM D101II and D202II displays are able to connect to the TM U375 printer using the display s ...

Page 32: ...set drives the motor gear so that it rotates in the direction of A the rotational force is transferred to the intermediate gear intermediate drive gear and intermediate gear B Each gear rotates in the direction of the The J paper feed roller shaft set then rotates in the direction of B Figure 2 2 Gear Train for Feeding the Paper Roll Gear train for feeding validation paper When the paper feed moto...

Page 33: ...e intermediate drive gear and the S belt is connected to the intermediate holder gear the S feed roller set rotates in the direction of B and the V feed roller set rotates in the direction of C by means of the respective belts Figure 2 4 Gear Train for Feeding Slip Paper Ribbon feed gear train The ribbon feed gear train consists of the parts shown in Figure 2 5 The ribbon drive plate set moves usi...

Page 34: ...e platen set in the direction of B 2 When the wire that is pushed out strikes the platen set through the ink ribbon and the paper one dot is printed 3 When the current supplied to the drive coil stops the wire and the moving plate are returned to their normal positions by the force of the wire return spring and the moving plate spring Figure 2 8 Wire Movement Printing operations involved in formin...

Page 35: ...tial setting of TM U375 Detection of head carriage operation abnormality Detection of presence absence of slip validation paper Detection of presence absence of paper on the paper roll Detection of cover open close Detection Mechanism Home position Carriage motor out of phase state Cut sheet TOF BOF Paper roll near end Cover open Figure 2 11 Sensor Mechanisms Home position detection mechanism The ...

Page 36: ...ut of phase State Detection Mechanism Figure 2 14 Carriage Motor Out of phase State Sensor Circuit Diagram Cut sheet detection mechanism The cut sheet detection mechanism functions as a TOF sensor that detects the top of the slip paper loaded from the front of the printer and as a BOF sensor that detects both the presence of validation paper loaded from the top of the printer and the bottom of the...

Page 37: ...of the paper roll by a spring inside the microswitch Therefore when there is a large amount of paper remaining on the roll the near end detection lever is pressed against the side of the paper roll as depicted by the solid lines in Figure 2 17 This keeps the microswitch turned on When the amount of paper left on the roll decreases below a predetermined level the tip of the near end detection lever...

Page 38: ... until the edge of the printable area on the slip is reached exactly Note that when the slip paper is fed current is supplied to the clutch mechanism mounted on the J paper feed roller shaft set before current is supplied to the paper feed motor set so that the paper roll is not fed forward Figure 2 21 Feeding Slip Paper During and After Printing Figure 2 19 Feeding the Paper Roll Feeding slip pap...

Page 39: ...er sets 4 When the cut sheet sensor detects the end of the validation paper it turns off the current supply to the paper holder switching solenoid This releases the restriction on the V movable lever set the dotted lines in Figure 2 23 causing the V feed roller set to move in the direction of the until it contacts the V holder roller set thereby sandwiching the validation paper The feeding of the ...

Page 40: ... the paper feed clutch plate and the other end is connected to the J paper feed roller The paper feed clutch spring normally squeezes the J paper feed roller shaft Whenever the J paper feed roller shaft rotates the shaft paper feed clutch plate and J paper feed roller move as one unit Note that the paper is fed forward by the friction between the J paper feed roller and J holder roller Figure 2 26...

Page 41: ...ion of A and the form stopper set linked to the paper holder lever set moves in the direction of B out of the paper path the state indicated by the dotted lines in Figure 2 28 Figure 2 28 Mechanical Form Stopper Mechanism Other mechanisms Manual release mechanism The J release lever of this mechanism is mounted on the rear portion of left side of the guide frame at the paper roll inlet on the left...

Page 42: ...he cutter on this unit is a manual cutter and consists of the parts shown in Figure 2 31 The cutter cover is normally used to protect the operator from injury When cutting the paper roll the cutter cover moves in the direction of the using the cutter cover shaft as a fulcrum and cuts the paper roll After cutting the paper the cutter cover is returned to its original position by the cutter cover sp...

Page 43: ... the ribbon take up gear rotates in the direction of D The ribbon feed roller and ribbon holder roller inside the ribbon cassette both of which are engaged with the ribbon take up set then begin to rotate so that the ribbon is fed When the carriage motor rotates in the forward direction the carriage motor gear rotates in the direction of E causing the ribbon intermediate gear and planet gears 1 an...

Page 44: ...ke up drive pulley The take up drive pulley rotates the take up gear by means of the take up torque spring and the take up gear rotates the take up shaft set which takes up the paper Note that the take up torque spring takes up paper with a fixed rotational force by balancing the rotational torque trans ferred sequentially via take up drive pulley A and the take up belt with fluctuations in the pa...

Page 45: ...trical circuitry of the TM U375 consists of the following major components Main circuit board unit Switch circuit board unit Sensor circuit board set External AC adapter optional Figure 2 37 is a component connection diagram for the electrical circuitry Figure 2 37 Electrical Component Connection Diagram CONFIDENTIAL ...

Page 46: ... 512K 64K x 8 bits RAM 256K 32K x 8 bits Gate array Operation panel control circuit Host interface circuit Customer display interface circuit Drawer kick out drive circuit Print head solenoid drive circuit Carriage motor drive circuit Paper feed motor drive circuit Platen switching solenoid drive circuit Clutch solenoid drive circuit Slip paper switching solenoid drive circuit Printer mechanism ov...

Page 47: ... this power supply circuit and their uses are shown in Table 2 3 The description of the power supply circuit is the same for the TM U375 and TM U375P but the diagram for the TM U375P is different from Figure 2 40 Refer to Chapter 7 for the TM U375P power supply circuit diagram Table 2 3 Power Supply Voltage Usage 00000H 00280H 00800H 01000H 08000H 10000H 80000H 88000H Voltage 5V 24V Usage Logic ci...

Page 48: ...24V DC voltage that drives the printer mechanism is supplied via a FET Q33 circuit signal I24PSW The output state 24V output on off of the FET Q33 is controlled by an IC U8A The SW24V signal is supplied from the P60 terminal pin 9 of the CPU U12 to the A terminal input pin 1 of the IC U8A The SW24V signal is the 24V system circuit protection signal This signal turns off the FET output when overcur...

Page 49: ...signal for controlling the 24V power supply circuitry The reset IC U4 monitors the 5V voltage when the voltage is 4 5V or more the reset is released for the CPU and other components and the printer becomes ready In addition the C terminal pin 5 of the reset IC U4 is connected to the reset signal CN9 9 from IM 403 or the reset signal the DSR signal or pin 25 input signal from the host interface CN2...

Page 50: ...n switching magnet return drive High active PWM mode during return Clutch magnet drive High active Unused Unused Drawer kick out drive signal 1 Low active Drawer kick out drive signal 2 Low active Carriage motor drive 1 2 2 phase excitation Carriage motor drive 2 2 2 phase excitation Carriage motor common High drive motor Low stop motor Platen switching magnet drive sig nal 1 High magnet return Lo...

Page 51: ... switch setting SW 3 DIP switch setting SW 4 DIP switch setting SW 5 DIP switch setting SW 6 DIP switch setting SW 7 DIP switch setting SW 8 Print solenoid 9 drive signal Low on Print solenoid drive trigger Low pulse trigger Unused open Error LED Low on DIP switch selection read PB0 to 7 High DIP switch 1 selected Low DIP switch 2 selected Platen switching magnet hold High hold JOURNAL OUT LED Low...

Page 52: ...ches PAPER FEED and RELEASE and a photosensor for detecting whether the printer cover is open or closed These are mounted on the switch circuit board unit and sensor circuit board set which is connected to the main circuit board unit via a connector CN8 Driving of the LEDs and detection of the switches and photosensor is controlled by the CPU U12 and signal input output is conducted through the ga...

Page 53: ...t interface connector CN2 on the TM and is connected directly to the RXD signal pin 3 of the customer display interface connector CN7 Pins 6 and 25 of the interface connector carry the printer reset signal which is selectable by DIP switch Refer to SW 7 and 8 of switch bank 2 in Table 1 10 DIP switch bank 2 Then select the Seiko Epson customer display by setting DIP switch 1 on the bank 2 to ON Wh...

Page 54: ...2 23 Figure 2 44 Host Interface Circuit and Custor Display Interface Circuit CONFIDENTIAL ...

Page 55: ...al DK_S is input to the gate array allowing the host to check the status via the interface The 24 V drawer power supply is controlled by the three pin regulator U1 which cuts off the supply in case of excessive current The drawer drive signal is also supplied to the IM 403 through CN9 See Chapter 7 for the TM U375P drawer kick out drive circuit Figure 2 45 Drawer Kick out Drive Circuit CONFIDENTIA...

Page 56: ...miter signal and turns the head off if due to misoperation power is supplied to the head for more than approximately 1ms The limiter time is determined according to the CR time constant C118 R157 of the signal input to the CRIN terminal pin 51 and is retriggered at the sitting edge of the HD_COM signal pin 21 Refer to Figure 2 46 The head temperature can be determined by reading the voltage HD_TEM...

Page 57: ...nism carriage motor as four phase drive signals CR_A CR_B CR_C and CR_D The CR_HL signal which controls the hold state of the motor is output from the P45 terminal pin 20 of the CPU U12 This signal in combination with the four phase drive signals controls the operation of the motor according to the timing chart shown in Figure 2 49 Figure 2 48 Carriage Motor Drive Circuit CONFIDENTIAL ...

Page 58: ...2 27 Figure 2 49 Carriage Motor Drive Signal Timing Chart CONFIDENTIAL ...

Page 59: ...ribed later in this section As with the carriage motor drive circuit the paper feed motor phase signals PFR1 pin 3 and PFR2 pin 2 output by the CPU U12 are supplied to the paper feed motor by this circuit as four phase drive signals PF_A PF_B PF_C and PF_D The PFR_HL signal which controls the hold state of the motor is output from the P65 terminal pin 4 of the CPU U12 Figure 2 50 shows the timing ...

Page 60: ...olding operation L H L H Clutch solenoid drive circuit Supplying current to the clutch solenoid in the printer mechanism cuts off the driving power of the paper feed motor so that paper feeding is not performed This makes it possible to switch between paper roll printing and cut sheet printing Refer to Section 2 2 4 Paper feed mecha nism The CPU U12 outputs the CLUTCH signal from the P53 terminal ...

Page 61: ...U12 When the CPU receives the CD_OFF signal it stops sup plying the 24V voltage through the SW24V signal output from the P60 terminal pin 9 Table 2 7 Solenoid Overcurrent Detection Signals Signal Name Source Target Solenoid CD_PLN Bridge driver QM5 Platen switching solenoid Pin 1 output terminal CD_SJC Transistor Q40 Slip holder switching Emitter side solenoid CD_CLT Transistor Q41 Clutch solenoid...

Page 62: ... SLIP CN12 Pin 2 SLIP P61 Pin 8 of CPU U12 Paper load switch status Not implemented Carriage home position detection Carriage motor printing position detection Paper roll near end sensor Cut sheet TOF BOF detection Connector Input Signals Control Circuit Signals Function supplied by the printer mechanism Sensor control circuits The statuses of the sensors shown in Table 2 8 are monitored by the CP...

Page 63: ...ing There is a set screw for the frame ground FG Use it for grounding the printer Be careful when wiring and connecting the interface power drawer kick out and customer display cables to avoid subjecting the connectors to excessive pressure Paper handling precautions Use only paper that meets the paper specifications in this manual Refer to Section 1 2 3 Paper specifica tions If paper does not mee...

Page 64: ... spool 4 Close the printer cover and turn off the power 5 Unplug the power cord from the electrical outlet then disconnect the 24 V DC cable from the printer 6 Disconnect the interface cable from the printer 7 Disconnect the drawer kick out cable and customer display cable from the printer if they are connected 8 Insert the transport fixing plate into the printer from front as shown in Figure 3 2 ...

Page 65: ...3 6 Inserting the Paper into the Spool 6 Tear off the paper roll receipt paper on the cutter then close the printer cover Note When the printer cover is open the PAPER FEED button is inactive Figure 3 4 Loading Paper Roll 4 Insert the tip of the paper into the paper inlet as far as it will go and push the PAPER LOAD switch to feed the paper roll until the paper comes out from the top of the printe...

Page 66: ...inlet Make sure you insert the paper into the inlet as far as it will go 3 For slip paper the paper will automatically be drawn in and printing will begin For validation paper printing will begin immediately after the paper is inserted Note When the VALIDATION SLIP indicator flashes this de pends on the application software remove the paper from the paper path Figure 3 9 Inserting Slip Paper 3 1 4...

Page 67: ...et to be loaded according to the time set by the ESC f t1 t2 command The VALI DATION SLIP LED blinks Detects the cut sheet and turns on the VALIDATION SLIP LED When using slip paper detects the slip after the set time t2 has passed If the slip is not detected re enters the slip waiting state When the slip paper is detected feeds the slip as far as the print start position then redetects the slip a...

Page 68: ...over To guard the power switch from incorrect operation attach the power switch cover on the printer power switch as shown in Figure 3 15 Figure 3 15 Mounting the Power Switch Cover 3 1 8 Removing the Jammed Paper To clear a paper jam inside the printer follow the steps below 1 Turn the printer power off and on again then open the printer cover 2 Remove the ribbon cassette from the printer 3 Lift ...

Page 69: ...specialize in printers Dust paper particles or dirt on and in the mechanism unit Shape of the springs Lubrication Ribbon cassette Operation check Checkpoints Remedies Table 3 1 Periodic Checks Clean the mechanism unit thoroughly with a vacuum cleaner Remove any pieces of paper from the paper path Replace any deformed springs Lubricate the points listed in Table 3 2 Lubri cation points for printer ...

Page 70: ...6 4 General Lubrication Points Diagrams The numbers in the left column of Table 3 2 Lubrication points for printer mechanism unit correspond to the num bers in the figures in Section 6 4 Lubrication schedule When the printer is overhauled or after every 5 million print lines Table 3 2 Lubrication Points for Printer Mechanism Unit No Type G 36 G 36 O 3 G 36 G 36 G 36 G 36 G 36 G 36 G 31 G 31 G 31 G...

Page 71: ... B mounting shafts of main frame Gear and hole of Gear Intermediate Gear and hole of Intermediate gear B Gear Intermediate securing E ring Lever Release J U groove V feed roller assembly mounting portions of V movable lever Linked lever U groove Intermediate holding roller assembly mounting portions of main frame Contact portion of V movable lever and Paper holding lever 24 25 26 27 28 29 30 31 32...

Page 72: ... cover 2 Turn on the printer while keeping both the RELEASE and PAPER FEED buttons depressed The VALIDATION SLIP LED flashes 3 Feed a sheet of validation paper into the printer The self test starts and status information is printed When printing on slip or validation paper the paper roll should also be inserted in the printer This prevents paper jams Self test standby Paper roll self test 1 When s...

Page 73: ...D lit Yes No 3 No Is paper roll in near end condition or not inserted Is self test nor mal Yes Host sends print data Yes END Is printout normal 7 No 6 No Yes Execute self test refer to Section 4 1 1 5 No Normally servicing should be performed by component replacement Repairs of the PCBs and other components should be performed only by technicians Is paper loaded by pressing down paper load switch ...

Page 74: ...PCB unit Yes END OK Replace main PCB END No No Yes Yes No No No Is power supply cable connected properly Connect power supply cable properly Yes END OK No Is POWER LED continuity normal No Yes Does external power supply have proper output voltage rating approx 24 V in no load condition Yes END OK No Yes Has fuse F1 on main PCB blown CONFIDENTIAL ...

Page 75: ...lace main PCB END Yes No To check the continuity of the cover open sensor Check the voltage at terminals 1 and 3 of CN2 on the switch PCB unit for the following 5 V when cover open is detected 0 V when cover close is detected END Is printer cover closed correctly Close the cover correctly OK END Yes No No Yes Is near end sensor continuity normal Replace near end sensor assembly No Yes OK Yes No EN...

Page 76: ...s inside the printer hooked up correctly END No Hook up connectors correctly OK Yes END No 5 No Is paper jammed in the paper inlet path OK END Yes No Replace printer mechanism assembly OK No Replace main PCB END END Yes Remove the paper OK END No Yes Is paper load switch continuity normal No Yes Yes Replace microswitch sub assembly CONFIDENTIAL ...

Page 77: ...o Yes No No Yes Yes No Is output voltage of regulator on main PCB within spec 3 END Is data printed on slip paper or paper roll when performing validation paper printing Printing is carried out but print quality is deficient or paper feeding is not normal Replace printer mechanism assembly OK END Yes No Replace main PCB END Yes No 1 To check the continuity of the cover open sensor Check the voltag...

Page 78: ...K No Yes Are RS 232C interface parameters set to identical values at host and printer No Yes Yes No Is output voltage of regulator on main PCB within spec Does interface cable match specifications Replace with a proper cable OK No Replace main PCB END Yes Is the interface wire broken OK No Yes END Replace the interface cable OK No Yes END Verify the voltages shown in this table Checkpoint Rating R...

Page 79: ...mination has occurred use the tables below to determine the cause and perform repairs There are three tables divided by symptom category Table 4 1 Initialization Problems Table 4 2 Printing Quality Problems Table 4 3 Printer Mechanism Problems The tables contain the following columns Problem This is the symptom that can be verified Probable Cause This is a listing of one or several possible causes...

Page 80: ... sensor sub assembly failure Carriage motor failure Checkpoint Check gears for wear and dam age Check for dirt deposits or other foreign matter Check input signal to carriage motor drive terminal of CN13 with an oscilloscope Check continuity between re spective terminals Check solder condition Move the Carriage motor and check the timing detection sig nal with an oscilloscope Above four checks hav...

Page 81: ...ng Adjust the solenoid attach ing position as described in Main Assembly 7 in Sec tion 5 3 3 Replace Main circuit board unit Problem Paper roll is not loaded when paper load switch is pressed It is hard to insert cut sheet or it cannot be inserted Level B A A B A B Probable Cause FFC Print head wire break Print head operation fail ure Print head unit wear Belt tension is loose Carriage drive area ...

Page 82: ...Hook Spring J holding roller or replace it Replace Main circuit board unit Attach J paper guide roller Replace Paper take up shaft assembly Replace any damaged parts Position the belt properly or replace it Replace V sensor sub assembly Repair TOF BOF sensor circuit Use cut sheet that corre sponds to specifications See Section 1 2 3 Paper specifications Insert cut sheet along the guide Remove any ...

Page 83: ...er assembly and V paper feed roller as sembly Replace any damaged gears Repair paper feed motor drive signal generator cir cuit Replace Paper feed motor Replace Microswitch sub assembly Replace IC U3 Set DIP switches correctly See Section 1 3 5 Switches and buttons Replace cable Problem Slip or validation paper is not fed continued Cut sheet feed pitch is irregular or paper does not advance and pr...

Page 84: ... removing the ribbon cassette 4 2 MAJOR PART REPLACEMENT 4 2 1 Fuse Replacement Follow the steps below to replace a blown fuse 1 Turn the printer off 2 Disconnect the external power supply 3 Disassemble the printer following the procedure de scribed in Section 5 2 1 Fuse replacement 4 Replace the blown fuse 125 V 2 5 AT 5 Perform steps 1 through 3 in reverse If the printer still does not operate p...

Page 85: ...No repair is necessary in this case 2 A paper jam that occurred beyond the carriage movement area cannot be detected in this case 3 A paper jam that occurred after the paper passed through the cut sheet sensor cannot be detected in this case Action Action 1 Action 2 Action 2 Action 2 Action 3 Action 3 Action 3 Action 3 Action 3 Error Description Print head temperature is too high Home position cou...

Page 86: ...r OK Yes END Yes Is the printer recovered from the error No END Execute DLE ENQ 1 or DLE ENQ 2 command or reset the printer Replace main PCB OK Yes No END Replace printer mechanism assembly END Any data in the buffer is lost when the printer power is turned off When the printer recovers from an error using DLE ENQ 1 with cut sheet mode selected the printer ejects the cut sheet and then executes lo...

Page 87: ...te self tap ping screw CCS tite Cross recessed Cup head S tite self tap ping screw CPP tite Cross recessed Pan head P tite self tap ping screw CPT B Cross recessed Pan head self tapping screw without fluted class 2 CPT B P2 Cross recessed Pan head self tapping screw without fluted class 2 and with Plane washer 2 RE Retaining ring E type 5 1 SMALL PART SPECIFICA TIONS This section uses abbreviation...

Page 88: ... basically the reverse of the assembly steps described in these sections 5 2 1 Removing the Fuse Disassembly Step 1 2 3 4 5 Disassembly Procedure Turn over the printer Remove the screws from the Plate Base assembly Remove the GND plate fastening screw and release the Plate Base assembly from the tab of the GND plate Remove the Plate Base assembly from theCase Main then disconnect all connectors co...

Page 89: ... assembly by turning it in the direction Remove the Print head unit from the printer and disconnect the FFC Print head from the print head unit connector Checkpoint Position the Print head unit in the area of the head positioning mark after replacing the print head then close the Ribbon frame assembly Adjustment Adjust the platen gap as described in Adjustment D in Section 5 3 4 CONFIDENTIAL ...

Page 90: ... 3 in reverse Push the Lever Ribbon frame in the 1 direction and open the Ribbon frame assembly 2 direction Remove the J guide assembly B and Guide Mask fastening screw Remove the V feed roller assembly fastening E ring then remove the roller assembly from the printer Remove the J guide assembly B 5 2 3 Removing the J Guide Assembly B Cutter Blade CONFIDENTIAL ...

Page 91: ...s being carried over into another assembly 5 3 1 Component Parts Component parts in each assembly are shown in the following Small parts such as screws are omitted FFC guide assembly Sub assembly A FFC Print head Guide FFC Relay circuit board assembly Sub assembly B Relay circuit board sub assembly Carriage sensor sub assembly Home position sensor sub assembly Carriage assembly Sub assembly C Carr...

Page 92: ...Assembly 2 Fulcrum shaft B Linked lever spring Linked lever Fulcrum shaft A Platen holder spring Main Assembly 3 Intermediate drive shaft spring Intermediate drive roller assembly Guide frame assembly Sub assembly E Main Assembly 4 Lever Release J Spring J holding roller Main Assembly 5 J guide assembly B C feed belt V feed roller assembly Main Assembly 6 Solenoid Platen switching Tension lever as...

Page 93: ...ame Assembly Procedure FFC Print head Guide FFC Put a mark on the FFC Print head at 66 5 mm 2 62 from its bent portion Attach the FFC to the Guide FFC as shown in the figure Checkpoint Make sure that the FFC Print head marked portion aligns with the Guide FFC portion A CONFIDENTIAL ...

Page 94: ...ead wire colors Relay circuit board sub ass y Carriage sensor sub assembly Home position sensor sub as sembly Sub assembly C Carriage Assembly Assembly Step Part Name Assembly Procedure 1 2 Align the ribbed section of the Belt with the ribbed section of the Carriage sub assembly and mount the Belt Checkpoints Make sure to mount the Belt with the correct orientation Verify that the Belt is fully in...

Page 95: ...ock plate Spring pin Paper holding solenoid shaft S holding roller shaft sub as sembly Attach the Magnetic field block plate and paper holding solenoid shaft to the Paper holding lever then insert the Spring pin Insert side A of the shaft into hole B and mount the S holding roller shaft sub assembly on the Paper holding lever CONFIDENTIAL ...

Page 96: ...g roller shaft into holes A and B of the Guide frame sub assembly B then attach the E ring outside of hole A Engage the Spring J holding roller on the J holding roller shaft then attach the E ring to the shaft outside of the spring Assembly Step 1 2 Assembly Procedure Part Name Sub assembly F V Sensor Assembly V sensor sub assembly Sensor holder Insert the V sensor sub assembly into the Sensor hol...

Page 97: ...Platen holder Attach the V movable lever spring to hook A of the Platen Align the dowel holes of the Platen with the dowels of the Plate Platen mounting and fasten the Platen with the screws Attach the assembled Plate Platen mounting to the Platen holder Attach the Cover Platen holder to the Platen holder Checkpoint Verify that there is platen play left and right and up and down CONFIDENTIAL ...

Page 98: ...n holder so that the bottoms of the rollers are inserted in the rectangular holes on the Plate Platen mounting Press the Platen adjustment roller holders into the Platen holder by covering the Platen adjustment rollers with the holders Align tabs B with portions C and attach the V movable lever spring to hook D Checkpoint Make sure to fully press in the Platen adjustment roller holders CONFIDENTIA...

Page 99: ...5 13 Assembly Step Assembly Procedure Part Name Sub assembly G J feed roller shaft assembly 9 Attach the J feed roller shaft assembly to the U grooves of the V movable lever CONFIDENTIAL ...

Page 100: ...mbly B Assembly Step Assembly Procedure Part Name Frame Ribbon Microswitch sub assembly 1 2 Align dowel A of the Microswitch sub assembly with hole B on the Frame Ribbon Route the microswitch lead wires as shown in the figure CONFIDENTIAL ...

Page 101: ...both ends of the V holding roller shaft to grooves C of the Guide Slip paper then push the shaft until it clicks Checkpoints Make sure that the flat side of the Roller Holding large and small face inward Attach the Spring J insertion lever B to shaft D of the Guide Slip paper Attach the Lever J insertion to shafts D and E of the Guide Slip paper Attach the E ring to shaft D Make sure that the Spri...

Page 102: ...me Ribbon attach the Microswitch to the frame at first and attach the Lever J insertion by inserting it into hole G and aligning dowel H with indent I then secure the Guide Slip paper with the screws Checkpoint Verify that the Microswitch Guide Slip paper and Frame Ribbon are attached together with their dowels and dowel holes Turn over the Frame Ribbon and insert the Lever Ribbon frame in hole J ...

Page 103: ...FFC guide ass y pawl with the print frame sub assembly notch and align the indent with the protrusion Attach the FFC Print head to the relay circuit board assembly connec tor Align relay circuit board assembly holes A and B with FFC guide assembly poles C and D respectively while engaging portion E in notch F then tighten the screw in hole A Checkpoint Verify that the FFC Print head is fully inser...

Page 104: ...ub assembly CB M3 x 4 x 1 Turn over the Print frame sub assembly and insert the carriage motor gear in hole G then secure the motor with the screw Attach the Plate Carriage sensor to the Carriage motor so that the tabs engage portion H Align hole I with the dowel and secure the Carriage sensor sub assembly to the Plate Carriage sensor with the screw CONFIDENTIAL ...

Page 105: ...int frame sub assembly into the rectangular hole then tighten the screw loosely so that the tension plate moves Secure the Home position sensor sub assembly to the Print frame sub assembly with the screw Route the home position sensor lead wires under portion J Checkpoint Verify that the soldered connections on the rear of the Home position sensor sub assembly do not touch the Carriage motor Sub a...

Page 106: ... the Gear Intermediate transmission to the Print frame sub assembly with the small gear face down and fasten it with the E ring Attach the Gear Ribbon intermediate to the Print frame sub as sembly with the small gear face up Attach the Gear Ribbon transmission to the Print frame sub ass y with the small gear face up Attach the Ribbon take up shaft assembly to the Print frame sub assembly Attach th...

Page 107: ...rriage guide A in the Carriage assembly through hole M of the Print frame sub assembly and fasten it with the E ring Attach the Spring Belt tension to hook N of the Tension plate assembly and hook O of the Print frame sub assembly Push the Pulley Belt drive in the direction to stretch the belt tight then tighten the tension plate screw firmly Move the Spring Belt tension from hook N to hook P the ...

Page 108: ...on the Carriage assembly The plate is not fastened here It is fastened in Main Assembly 16 Attach the FFC Print head to the print head unit connector Attach the Print head unit to the Carriage assembly and tighten the screw provisionally Final tightening is done in the platen gap adjustment performed in Main Assembly 16 Checkpoint Make sure that the left and right sides of the Insulation sheet are...

Page 109: ...irection align the U grooves of the Frame Ribbon with the grooves on the Shaft Carriage guide A Pass the Shaft Carriage guide B through the Frame Ribbon Print frame sub assembly and carriage assembly pawls R Then fasten the shaft with the E ring Solder the microswitch lead wires to the points on the Relay circuit board assembly Checkpoint Make sure to route the microswitch lead wires as shown in t...

Page 110: ...ft holder left RE 2 3 x 1 Attach Paper take up drive pulley A to the Main frame assembly and fasten it with the E ring Attach the Paper take up drive gear to the J feed roller shaft Place the Platen holder unit inside the Main frame assembly so that the J feed roller shaft holder right and J driving gear emerge from hole A Attach the J feed roller shaft holder left to the Main frame assembly align...

Page 111: ...rum shaft B from inside the Platen holder unit and fasten the shaft with the E ring Place the Linked lever spring inside the Linked lever then place portion A in groove B Pass Fulcrum shaft A from inside the Platen holder unit through the Linked lever and Linked lever spring then attach the E ring to the shaft Attach the Platen holder spring to shaft C and lock it with dowel D of the Linked lever ...

Page 112: ...ss the Intermediate drive roller assembly from the right side of the Main frame assembly through the hole to the Intermediate drive shaft spring and then align groove B with hole C Insert the Guide plate between portions D 1 direction then move the Guide frame assembly B in the 2 direction to secure it in place Fasten the guide frame with the screws Checkpoints Make sure that the tab of the Guide ...

Page 113: ...t Lever Release J CCS tite M2 5 x 4 x 1 Spring J holding roller Align the U groove of the Lever Release J with the shaft inside the spring and insert tab A into hole B then secure the lever with the screw Attach the Spring J holding roller to portion C of the Guide frame assembly B CONFIDENTIAL ...

Page 114: ...tions B and D respectively The J guide assembly B is secured later in Main Assembly 16 Attach the C feed belt to the Intermediate drive gear While attaching the C feed belt to the S feed gear attach the V feed roller assembly to the V movable lever Fasten the V feed roller assembly with the E ring J guide assembly B C feed belt V feed roller assembly RE 2 3 x 1 CONFIDENTIAL ...

Page 115: ...d in Main Assembly 14 Attach the Tension pulley to the C feed belt Attach the Tension lever assembly to the Main frame assembly and provisionally fasten the Tension lever assembly and Solenoid Platen switching with the screw Final tightening is done in Adjust ment B performed in Main Assembly 14 Checkpoint Make sure to attach the Solenoid Platen switching so that the lead wires face front of the p...

Page 116: ...lenoid Paper holding switching then secure the solenoid with the screw When attaching the solenoid adjust its position so that the space between the lower end of hole C and the lower end of hole D is within 0 5 mm 02 Checkpoint Make sure to route the lead wires between portion E and the right side of the frame Solenoid Paper holding switch ing CC M3 x 5 x 1 CONFIDENTIAL ...

Page 117: ...as sembly S belt Insert the S feed roller assembly in holes A and B from the bottom of the Main frame assembly Secure the roller assembly with the E ring Insert the Intermediate holding roller assembly from inside the Main frame assembly in hole C Attach the S belt to the small gear of the Intermediate holding gear and to the S feed gear then insert the Intermediate holding roller assembly in hole...

Page 118: ...upper CCS tite M2 5 x 4 x 1 Insert the Paper guide upper from the front of the Main frame assembly 1 direction Move the paper guide in 2 direction and align the U shaped notch with dowel A hole B with dowel C L shaped portion D with portion E and protrusions F with holes G then tighten the screw CONFIDENTIAL ...

Page 119: ...ch Intermediate gear B to the Main frame assembly with the small gear facing inside Attach the Gear Intermediate to the Main frame assembly with the small gear facing inside then secure it with the E ring Insert shaft A into the Solenoid Paper holding switching Insert the Paper holding lever shaft into hole B and pass it through the Paper holding lever assembly then attach two E rings inside holes...

Page 120: ...he Paper feed motor to the Main frame assembly so that portions A and B hold the motor then tighten the screws Attach the Form stopper assembly to the Main frame assembly from the inside and insert the shaft of the stopper into hole C then install the E ring Adjustment Adjust the backlash between the Gear Intermediate and Gear paper feed motor as described in Adjustment A in Section 5 3 4 CONFIDEN...

Page 121: ...t Name Main Assembly 12 V Sensor Assembly Attachment Align surface A of the V sensor assembly with surface B of the Main frame assembly then secure the sensor with the screw V sensor assembly Sub assembly F CCS tite M2 5 x 5 x 1 1 CONFIDENTIAL ...

Page 122: ...nd V sensor assembly connector together as shown in the figure Dress all wires except for the Solenoid Paper holding switching along portion A Bind all wires except for the Solenoid Paper holding switching with the Cable tie Bundle all wires where they contact the Main frame assembly using the Insulation adhesive tape Part Name Connectors Cable tie Insulation adhesive tape 1 2 3 CONFIDENTIAL ...

Page 123: ...ortion E Make sure that the Form stopper assembly does not touch the shaft of the Intermediate holding roller assembly and portion F of the Main frame assembly If it touches loosen screw G and move portion H Adjustments Adjust the space between the Linked lever and Platen holder as described in Adjustment B in Section 5 3 4 Adjust the Tension lever as described in Adjustment C in Section 5 3 4 Par...

Page 124: ...ith the U shaped grooves of the Main frame assembly Tighten the screws in order of 1 to 4 Checkpoint Make sure to tighten the screws in the proper order Adjustment Adjust the platen gap as described in Adjustment D in Section 5 3 4 Part Name Print frame unit B Sub assembly I CCS tite M3 x 8 x 2 CCS tite M3 x 6 x 2 1 CONFIDENTIAL ...

Page 125: ...with the screw Turn the Print head unit back and tighten the screw Attach the Guide Mask to the J guide assembly B and secure the mask with the screw Move the Print head unit to the center and close the Ribbon frame assembly Checkpoint Confirm the Print head mask assembly B position at left right and center At the right and left there must be space between the Print head mask assembly B and the J ...

Page 126: ...e correct operation Adjust ment Step Adjustment A Gear Intermediate and Gear Paper Feed Motor Backlash 1 2 3 Loosen the fastening screws of the Motor Paper feed Move the Motor Paper feed to adjust the backlash Tighten the fastening screw of the Motor Paper feed Nominal value A 0 05 to 0 15 mm 0 002 to 0 006 Procedure Adjustment Notes CONFIDENTIAL ...

Page 127: ...he space between the Linked lever and Platen holder Tighten the screw to secure the solenoid Space A 9 3 0 2 mm 0 37 0 008 Adjust ment Step Adjustment C Tension Lever Adjustment 1 2 Loosen the Tension lever fastening screw Apply a tension gauge to the lever and firmly tighten the screw at a force of 40 g 088 lb Nominal tension value 40 g 088 lb Procedure Adjustment Notes Procedure Adjustment Notes...

Page 128: ...mm 026 002 1 2 3 Verify that the platen surface protrudes from the guide frame surface Move the Print head unit to the two adjust ment points and perform Step 3 for each point Insert a clearance gauge between the Print head unit and the Platen and adjust the gap to get the nominal value B by turning the Platen adjustment rollers Procedure Assembly Notes CONFIDENTIAL ...

Page 129: ...it Sub assembly C Main circuit board assembly P ROM Paper take up gear assembly Sub assembly D Paper take up gear Paper take up torque spring Paper take up drive pulley Rubber feet and Frame ground screw Sub assembly E Plate Base assembly Rubber foot Switch circuit board assembly and Sensor circuit board assembly Sub assembly F Plate Front Switch circuit board assembly Sensor circuit board assembl...

Page 130: ...er N E detector and tighten the screw Place protrusions B of the Lever N E detector onto section A of the Holder N E detector Align the U shaped grooves with dowels C by turning the Lever N E detector in the direction of the arrow with protrusions B as the center Checkpoints Verify that the Nut is mounted on the correct place in the correct direction Make sure that the Microswitch is attached in t...

Page 131: ...l B After removing any dust and dirt from the caution seals mounting surfaces paste the seals along the lines inside the Cover Checkpoints Make sure that the caution seals are pasted in the proper position and direction Verify that no punctures bubbles tears or peels are evident after pasting the caution seals CONFIDENTIAL ...

Page 132: ...heckpoint Make sure not to mistake the direction of the P ROM Sub assembly D Paper Take up Gear Assembly Assembly Step Part Name Assembly Procedure 1 2 3 Paper take up gear Paper take up torque spring paper take up drive pulley Place the catch of the Paper take up torque spring on the Paper take up gear Place the cutout of the Paper take up drive pulley on the catch of the Paper take up torque spr...

Page 133: ...Assembly Step Part Name Assembly Procedure 1 2 3 Plate Base assembly Rubber foot x 2 CP O M3 x 5 x 1 After removing any dust or dirt from the rubber feet mounting locations paste the feet in place Tighten the frame ground screw on the Plate Base assembly CONFIDENTIAL ...

Page 134: ...mbly with hook C and dowel D on the Plate Front respectively then fasten the board assembly with the screws Connect the C O sensor cable to the Sensor circuit board assem bly Attach the Sensor circuit board assembly to the Plate Front and tighten the screw Be careful not to damage the sensor when tightening the screw Checkpoint Make sure to align the dowel holes in the Switch circuit board assembl...

Page 135: ...arriage motor cable assembly Power switch assembly Plate Base assembly Sub assembly E Hexagon lock screw x 2 Cover Circuit board CP P M3 x 5 x 4 Attach the Motor cable Head cable Carriage motor cable and Power switch assemblies to the corresponding connectors on the Main circuit board unit Place the Main circuit board unit on the Plate Base assembly Fasten the Main circuit board unit to the Plate ...

Page 136: ...ure Part Name Main Assembly 2 N E Detector Unit Attachment 1 2 Case Main N E detector unit Sub assembly A Align portion A of the N E detector unit with portion B of the Case Main and slide the detector unit in to attach it CONFIDENTIAL ...

Page 137: ...ace tabs B of the Plate Base assembly under portions C of the Case Main then turn the plate in the direction Make sure that holes D are aligned with dowels E then tighten the screws Align dowels F of the Plate Auxiliary with pole G of the Case Main then secure the plate with the screw Checkpoint Verify that the cables are not caught between the Case Main and the Plate Base assembly N E detector un...

Page 138: ...e Attach the J paper guide roller to the U grooves A on the Case Main Attach the Power switch assembly to the Case Main Attach theSpacer N E detector to the Detection adjustment screw then insert and tighten the screw in the hole of the N E detector unit Attach the Paper take up belt to the pulley of the Paper take up gear assembly then place the gear assembly in portion B of the Case Main Insert ...

Page 139: ...late Front to the Printer mechanism assembly At this time make sure that dowel A of the Plate Front is aligned with U groove B of the Printer mechanism assembly Make sure that dowels C is aligned with holes D and secure the Plate Front with the screws Printer mechanism assembly Plate Front Sub assembly F CCS tite M3 x 8 x 2 CONFIDENTIAL ...

Page 140: ...ter mechanism assembly Gently place the Printer mechanism assembly on the Case Main by attaching the back of the mechanism assembly first at an angle Fasten the Printer mechanism assembly with the screws Connect the cables from the Printer mechanism assembly to CN11 and CN12 then position the cables as shown in the figure Sleeve x 4 Vibration spacer x 4 Printer mechanism assembly CPT B P2 M2 6 x 2...

Page 141: ...elt and Connecting the Cables 1 2 Paper take up belt Cables Hold the middle of the Paper take up belt with your finger and attach the belt to the Paper take up drive pulley Attach the three cables from the Main circuit board unit to the connectors on the Printer mechanism assembly CONFIDENTIAL ...

Page 142: ...ain circuit board unit Bundle all the cables in front of the Main circuit board unit with the Eye lock Twist the Eye lock as indicated by the so that it does not come off Insert tab A on the GND plate into hole B in the Case Main Tighten the screw in hole C then tighten the screw in hole B Checkpoint Make sure that the GND plate is secured by tightening the screws in the proper order hole C then h...

Page 143: ...M3 x 5 x 1 Remove any dust or dirt from the Switch panel s mounting surface on the Plate Front then paste the panel along the edge of the plate Attach the Cover Face to the Case Main and secure the cover with the screws Hold the curved side of the Cover Face and Plate Front with your hand not to push them down when tightening the CP screw CONFIDENTIAL ...

Page 144: ...ed line in the figure of the Document table into the Case Main as indicated by 1 Slide the table in the direction of 2 and secure it with the screw Attach the Cover to the Case Main by sliding dowels A onto indents B Attach the Paper take up shaft assembly to the Case main Main Assembly 10 Document Table Cover and Paper Take up Shaft Assembly Attachment CONFIDENTIAL ...

Page 145: ...move any dust or dirt from the Spacer ROM mounting location on the Cover ROM Paste the Spacer ROM in place as shown in the extended illustration Move the Cover ROM fully to the direction and secure the Cover ROM on the bottom of the printer with the screw Checkpoint Make sure to move the Cover ROM fully to the direction CONFIDENTIAL ...

Page 146: ... the paper end is used the mark may cause the paper to stick together In this case dimension A is not correct If the paper on the paper roll becomes loose due to the paper quality the paper roll near end detector may operate incorrectly Use a paper roll for which the inner diameter ød of the paper core is 10 mm 394 or more Select a near end thickness A the thickness of the paper core includ ing th...

Page 147: ...s to room temperature Adjust ment Step Procedure Adjustment Notes Turn on the printer Open the cover Load the paper roll Install the ribbon cassette Turn off the printer Turn on the printer while pressing the FEED button Press the FEED button at least three times Close the cover The DIP switch settings are printed Refer to the print sample on the right Turn off the printer Measure the room tempera...

Page 148: ...ng pages The circuit 4 and main circuit are different from ones for the TM U375P See Chapter 7 for the TM U375P circuit 4 and main circuit 6 1 1 Main Circuit Block Diagram Figure 6 1 indicates the main circuit board block diagram Circuit 1 to circuit 6 are included in the main circuit Figure 6 1 Main Circuit Block Diagram CONFIDENTIAL ...

Page 149: ...6 2 Circuit 1 CONFIDENTIAL ...

Page 150: ...6 3 Circuit 2 CONFIDENTIAL ...

Page 151: ...6 4 Circuit 3 CONFIDENTIAL ...

Page 152: ...6 5 Circuit 4 CONFIDENTIAL ...

Page 153: ...6 6 Circuit 5 CONFIDENTIAL ...

Page 154: ...6 7 Circuit 6 CONFIDENTIAL ...

Page 155: ...6 8 Main Circuit The main circuit for the TM U375P is different from the below See Chapter 7 for the TM U375P main circuit CONFIDENTIAL ...

Page 156: ...6 9 CONFIDENTIAL ...

Page 157: ...6 10 CONFIDENTIAL ...

Page 158: ...6 11 CONFIDENTIAL ...

Page 159: ...6 12 CONFIDENTIAL ...

Page 160: ...o host The STATUS data transmission from the printer to the host is accomplished in the Nibble or Byte mode This mode allows data transmission from the asynchronous printer under the control of the host Data transmissions in the Nibble mode are made via the existing control lines in units of four bits Nibble In the Byte mode data transmission is accomplished by making the 8 bits data lines bidirec...

Page 161: ...l ground level Interfacing conditions should be all based on the TTL level In addition both the rise and fall of each signal must be 0 5µs or less Data transmission should not ignore the signal nAck or Busy An attempt to transmit data with either signal nAck or Busy ignored can cause lost data Data transmission to the printer should be made after verifying the nAck signal or while the Busy signal ...

Page 162: ...ven to the ASB status for transmission over the other status signals Any accumulated ASB status signals left for transmission from the last to the newest ASB status transmission should be transmitted together at one time as one ASB status showing the change has been made followed by the latest ASB status Example In the normal wait state the ASB status is configured as follows 1st status 2nd status...

Page 163: ...rror occurs DLE EOT and DLE ENQ cannot be used when the printer is busy due to a receive buffer full state When using a host that can transmit data when the printer is busy and the receive buffer becomes full while transmitting bit image data not as a command Secondly any data transmitted when the receive buffer is full may be lost Thirdly data sent during data entry or data sent when the printer ...

Page 164: ...ection 7x9 9x9 font 42 CPL 35 CPL 40 CPL 33 CPL 3 Busy condition Receive buffer full Off line or receive buffer full 4 Internal use do not change the setting 5 Internal use do not change the setting 6 Internal use do not change the setting 7 Undefined 8 nlnit reset signal Fixed to ON NOTE Changes in DIP switch settings are recognized only when the printer power is turned on or reset using the inte...

Page 165: ...7 6 Circuit Block Diagram Figure 7 3 TM U375P Circuit Block Diagram Power Supply Circuitry Figure 7 4 TM U375P Power Supply Circuit Diagram CONFIDENTIAL ...

Page 166: ...ay U19 as the RESET input signal pin 1 The output pin 6 is also supplied as the switching signal for controlling the 24V power supply circuitry The reset IC U4 monitors the 5V voltage when the voltage is 4 5V or more the reset is released for the CPU and other components and the printer becomes ready Reset IC output becomes low and CPU is reset if I F reset signal nlnit 31 is supplied more than 50...

Page 167: ...7 8 Table 7 4 TM U375P CPU Pin Functions continued Gate Array Table 7 5 TM U375P Gate Array Pin Assignment CONFIDENTIAL ...

Page 168: ...7 9 Table 7 5 TM U375P Gate Array Pin Assignment continued CONFIDENTIAL ...

Page 169: ...ta transmission from host to printer and IEEE 1284 nibble byte mode that transmits in the reverse direction Refer to the parallel interface circuit board parts layout shown later in this chapter Drawer Kick out Drive Circuit The DKD_1 and DKD_2 signals from the CPU set the drawer kick out driver transistors Q7 and Q8 to on they in turn output the drawer open signal The drawer status signal DK_S is...

Page 170: ...eplace with a proper cable No END OK No Does interface cable match specifications Yes 7 Is the interface wire broken Yes No No Is the I F board connected to the main PCB firmly Connect the board firmly Yes END No Yes OK END OK Yes Replace the I F board Replace printer mechanism assembly No OK END Yes No Check the host Yes 7 CONFIDENTIAL ...

Page 171: ...the P ROM to the socket of the main circuit board assembly matching the U shaped grooves of the socket to the P ROM Attach the I F circuit board to the main circuit board assembly Checkpoint Make sure not to mistake the direction of the P ROM ASSEMBLY Whole Unit Sub assembly C Main Circuit Board Unit CONFIDENTIAL ...

Page 172: ...e base assembly Sub assembly E Cover circuit board C P P M3 x 5 x 4 C P M3 x 5 x 2 Attach the motor cable head cable carriage motor cable and power switch assemblies to the corresponding connectors on the main circuit board unit Place the main cicuit board unit on the plate base assembly Place the cover circuit board on the main circuit board unit and fasten the cover with the screws Secure the sc...

Page 173: ...NDIX Main Circuit Board Diagrams All the main circuit board diagrams except the circuit 4 and main circuit are the same as the TM U375 See Chapter 6 for the diagrams that are the same as the TM U375 CONFIDENTIAL ...

Page 174: ...CONFIDENTIAL ...

Page 175: ...CONFIDENTIAL ...

Page 176: ...7 17 CONFIDENTIAL ...

Page 177: ...7 18 CONFIDENTIAL ...

Page 178: ...7 19 CONFIDENTIAL ...

Page 179: ...7 20 CONFIDENTIAL ...

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Epson U375 - TM B/W Dot-matrix Printer, Technical Manual

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Summary of Contents for U375 - TM B/W Dot-matrix Printer

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