Brother SC-2000 Service Manual Download Page 119

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III - 1

CHAPTER III THEORY OF OPERATION

1. MAIN PCB

1.1 Logic Components

(1) CPU

The CPU (#19: M37702) is a CMOS (16-bit) microprocessor, and controls and
supervises the whole system.

This CPU contains a 32-Kbyte ROM and a 2048-byte RAM.

The external 8-bit data bus controls the SRAM and I/O. The internal data bus
is of 16 bits.

(2) SRAM

Two 1-Mbit SRAMs (#11 and #12: µPD431000AGW) or equivalents are used.
These SRAMs serve as working areas for a printer buffer.

(3) Gate array

The gate array (#13: µPD65612-053) provides an interface between the CPU
and the SRAMs, controls the main motor and sensors, and provides a parallel
interface and expanded I/O.

1.2 EEPROM Circuit

Fig. 3.1 shows the EEPROM circuit.

The EEPROM (#21) is a ROM into which data can be electrically written. It has
initial values for each setting, which can be changed in the test mode.

Fig. 3.1 EEPROM Circuit

Summary of Contents for SC-2000

Page 1: ...Stamp Creator PRO SERVICE MANUAL MODEL SC 2000 Version A ...

Page 2: ...Stamp Creator PRO SERVICE MANUAL MODEL SC 2000 ...

Page 3: ...ht Brother 1999 All rights reserved No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher Specifications are subject to change without notice ...

Page 4: ...tions I 3 1 8 Magazine Tray Specifications I 3 1 9 Stamp Specifications I 4 1 10 Draft Sheet Specifications I 6 1 11 ID Label Specifications I 6 CHAPTER II THEORY OF MECHANISM OPERATION II 1 1 PRINTING MECHANISM II 1 1 1 Construction of Thermal Head II 1 1 2 Theory of Printing II 1 1 3 Configuration of Character and Graphics II 1 2 ENGRAVING STAMP MECHANISM II 2 2 1 Theory of Engraving Stamp II 2 ...

Page 5: ...tor Holder Assy and the Motors III 29 1 17 Disassembly of the Rollers III 30 1 18 Disassembly of the Label Guide Assy III 31 1 19 Disassembly of the Film Path Assy III 33 1 20 Disassembly of the Drawer Connector III 35 2 REASSEMBLING PROCEDURES III 36 2 1 Reassembly of the Drawer Connector III 36 2 2 Reassembly of the Film Path Assy III 37 2 3 Reassembly of the Label Guide Assy III 42 2 4 Reassemb...

Page 6: ...n Unit III 78 2 20 Reassembly of the Magazine Tray Assy III 79 2 21 Reassembly of the AC Cord and the I F Cable III 79 2 22 Lubrication during Reassembly III 80 CHAPTER IV TROUBLESHOOTING IV 1 1 GENERALS IV 1 2 PRECAUTIONS ON REPAIRING IV 1 3 ACTIONS TO BE TAKEN AFTER REPAIRS IV 1 ...

Page 7: ...IFICATIONS 1 1 Overview 1 External view See Fig 1 1 2 Dimensions 470 mm W 238 3 mm D 180 8 mm H without the magazine tray assy 3 Weight Approx 8 kg 4 Total weight Approx 11 kg machine and package 470 mm 238 3 mm 180 8 mm Fig 1 1 External Dimensions ...

Page 8: ... Dots CG construction 5 dots 7 dots the cursor 4 Dot size 0 58 mm wide by 0 524 mm high 5 Dot pitch 0 65 mm wide by 0 594 mm high 1 4 Printing Specifications 1 Printing type Thermal fusion and printing method by thermal head 2 Printing speed 99 2 dots sec 4 2 mm sec 3 Thermal head construction Thin film thermal head 960 dots 1 dot Vertical pitch 0 0425 mm 1 600 inch Dimensions of a heating element...

Page 9: ...nstruction Xenon tube reflector acrylic plate and glass plate 4 Packaged standard xenon unit Yes 1 piece 1 7 Ribbon Cassette Specifications 1 Ink color Black 2 Printing times 150 or more printing surfaces 1 printing surface includes both an ID label and a draft sheet 3 Packaged standard ink Yes 1 piece ribbon cassette 1 8 Magazine Tray Specifications 1 Capacity 50 draft sheets 2 Separation method ...

Page 10: ... Stamp Specifications 1 Types and sizes of stamp Size Dimensions mm 1212 28 31 2020 36 39 3030 47 50 4040 57 60 1060 26 79 1438 30 57 1850 34 69 2260 38 79 2770 43 90 3458 51 78 4090 57 110 Fig 1 3 Stamp Types ...

Page 11: ...p Holder Fig 1 4 Stamp Configuration 3 Effective printing area Size Dimensions mm 1212 9 9 9 8 2020 18 0 18 0 3030 27 2 27 1 4040 37 4 37 3 1060 7 8 57 9 1438 11 9 36 2 1850 16 0 47 8 2260 19 0 56 9 2770 23 8 67 1 3458 31 3 54 9 4090 37 4 86 7 4 Ink color for each size Black red and blue 5 Packaged standard stamp Yes 1438 and 1850 2 pieces 2770 1 piece ...

Page 12: ... Yes 150 sheets Fig 1 5 Draft Sheet 1 11 ID Label Specifications 1 Dimensions 58 mm 170 mm 0 15 mm 2 Material White PET film with adhesive and a separator on the back 3 Type A total of 11 types 1212 2020 3030 4040 1060 1438 1850 2260 2770 3458 and 4090 4 Packaged standard ID label Yes 1438 and 1850 2 labels 2770 1 label ...

Page 13: ...I 7 Fig 1 6 ID Label 1438 Fig 1 7 ID Label 1850 Fig 1 8 ID Label 2770 ...

Page 14: ...g elements out of the 960 heating elements to energize them When the energized heating elements are heated the ink in the ink ribbon is fused and the ink is transferred to an adhered draft sheet or an ID label to print dots The ink ribbon and the draft sheet or the ID label are fed to the next printing position simultaneously at the same speed to start the next printing cycle By repeating the prin...

Page 15: ...ight As for the draft sheet s area printed with no character or graphics the light is directly irradiated on the printing surface The light heats the carbon contained in the printing material to thermally fuse the printing material and the pressure closes up the holes in the printing material This manufactures the printing surface with holes left only on the area with a character and graphics Afte...

Page 16: ...he shutters At this time the six micro switches send ON OFF signals according to the shapes of the hollows in the holder which depend on the size of the holder to detect the size of the holder as shown in Fig 2 3 Shutter rear Shutter front Holder Holder Micro switch for stamp size detection Triangular hollow in the holder Triangular projection of the shutter Holder Note The above shows holder 1850...

Page 17: ...he draft sheets set in the magazine tray assy are fed one by one from the side contacting the paper feed roller and then separated by the separating claws as shown in Fig 2 4 Magazine tray assy Paper feed roller Draft sheet Separating claws Fig 2 4 ...

Page 18: ...feeding position of the draft sheet is detected by the transparent sensors to control the printing start position and the engraving stamp position Paper feed roller Main motor Reflective sensor Reflective sensor Paper feed roller Transparent sensor Draft sheet Paper feed motor Nip roller Nip roller Paper eject roller Driving roller Eject roller shaft Xenon unit assy Fig 2 5 Feeding Path ...

Page 19: ...ever remove main capacitor charge PCB from the capacitor case since the PCB may be charged with high voltage List of Tightening Torque Position Screw Qty Tightening torque N cm kgf cm Paper feed motor Screw bind M2 6 5 2 49 9 8 5 1 Main motor Screw bind M3 5 2 58 8 9 8 6 1 Motor holder sub assy Screw bind M3 5 3 58 8 9 8 6 1 Presser unit assy Screw pan S P washer M3 6DB 12 117 6 9 8 12 1 Presser u...

Page 20: ... DISASSEMBLY PROCEDURES 1 1 Disassembly of the I F Cable and the AC Cord Remove the I F cable and the AC cord in the back of the machine as shown in Fig 3 1 AC cord Serial I F cable Parallel I F cable Fig 3 1 ...

Page 21: ...sy and the Xenon Unit Remove the magazine tray assy by lifting it diagonally While sliding the slide lever on the side of the machine upwards pull out the xenon unit as shown in Fig 3 2 Magazine tray assy Body cover Xenon unit Slide lever Fig 3 2 ...

Page 22: ... Cassette Assy Press the open button on top of the machine to open the cassette cover and remove the ribbon cassette assy as shown in Figs 3 3 and 3 4 Cassette cover Open button Body cover Fig 3 3 Body cover Ribbon cassette assy Fig 3 4 ...

Page 23: ... part A of the cassette cover to close it as shown in Fig 3 5 Cassette cover A Body cover Fig 3 5 Turn the machine over and remove the four screws to remove the main PCB assy as shown in Fig 3 6 Main PCB bottom plate Body cover Screws Screws Fig 3 6 ...

Page 24: ...s as shown in Fig 3 7 Note Put on a static control wrist band before handling PCBs Main PCB assy Ground wire Main chassis Screw Main PCB bottom plate Fig 3 7 Remove the five screws to remove the main PCB assy from the main PCB bottom plate as shown in Fig 3 8 Screws Main PCB bottom plate Main PCB assy Screws Fig 3 8 ...

Page 25: ...f the Capacitor Case Remove the shield plate and pull out the connector of the power supply harness from the power supply PCB assy as shown in Fig 3 9 Shield plate Body cover Power supply harness Power supply PCB assy Fig 3 9 ...

Page 26: ...ase from the bottom cover Remove the capacitor harness from the connector of the capacitor case and remove the screw to remove the ground wire as shown in Fig 3 10 Screws Body cover Capacitor case Capacitor harness Screws Ground wire Bottom cover Fig 3 10 ...

Page 27: ...ht side up open the cassette cover and remove the two screws to remove the cassette cover as shown in Fig 3 11 Screws Body cover Cassette cover Head holder assy Fig 3 11 Close the head holder assy and remove the two screws as shown in Fig 3 12 Head holder assy Screws Fig 3 12 ...

Page 28: ...and the screw Remove the slide lever as shown in Fig 3 13 Slide lever Eject cover Screw Fig 3 13 Remove the three screws in the back of the cover and remove the body cover by lifting it as shown in Figs 3 14 and 3 15 Screws Fig 3 14 ...

Page 29: ... screws to remove the control panel PCB holder from the body cover Remove the screw from the control panel PCB holder to remove the control panel PCB assy as shown in Fig 3 16 Body cover Screw Screws Control panel PCB assy Control panel PCB holder Fig 3 16 ...

Page 30: ...e open button to open the head holder assy as shown in Fig 3 17 Open button Head holder assy Fig 3 17 Remove the six screws to remove the main chassis from the bottom cover and remove the two cores as shown in Fig 3 18 Bottom cover Screws Main chassis Screws Screws Fig 3 18 ...

Page 31: ... PCB shield plate and the main chassis as shown in Fig 3 19 Main chassis Ground wire Screw PS PCB shield plate Screw Fig 3 19 Remove the size detection PCB harness from the bottom cover as shown in Fig 3 20 Size detection PCB harness Main chassis Bottom cover Fig 3 20 ...

Page 32: ...III 14 Remove the harness coming out of the main chassis from the bottom cover as shown in Fig 3 21 Bottom cover Main chassis Fig 3 21 ...

Page 33: ...he two screws securing the power supply PCB assy on the bottom cover to remove the power supply PCB assy Then remove the PS PCB shield plate as shown in Fig 3 22 Note Put on a static control wrist band before handling PCBs PS PCB shield plate Power supply PCB assy Bottom cover Screws Fig 3 22 ...

Page 34: ...arness Fig 3 23 Press the open button to open the head holder assy Pull parts A of the head protection cover in the direction of the arrow to remove it from the head guide shaft Remove the two screws to remove the thermal head unit from the head holder as shown in Fig 3 24 Note Take care not to touch the thermal head heat generating points Head guide shaft Head protection cover Thermal head unit A...

Page 35: ...rom the sensor brackets Remove the screw to remove transparent sensor assy A from the film path Remove the screw to remove transparent sensor assy B from the presser unit assy as shown in Fig 3 25 Head holder assy Reflective sensor assy A Reflective sensor assy B Screw Reflective sensor assy C Transparent sensor assy B Screw Screw Screw Transparent sensor assy A Screw Fig 3 25 ...

Page 36: ...ion from the main chassis as shown in Fig 3 26 Main chassis Micro switch assy A Screw Fig 3 26 Remove the screw to remove micro switch assy B for xenon reset from the main chassis Slide and pull out the xenon lock claw in the directions of arrows as shown in Fig 3 27 Xenon lock claw Micro switch assy B Screw Main chassis Fig 3 27 ...

Page 37: ...aten unit assy Main chassis Screws Fig 3 28 Slide the platen unit assy in the direction of arrow 1 pass gear A through the hole in the main chassis turn the projection of the bearing down tilt the platen unit assy in the direction of arrow 2 and pull it out in the direction of arrow 3 as shown in Fig 3 29 Platen unit assy Main chassis Bearing 1 2 3 A Fig 3 29 ...

Page 38: ...III 20 Subsequently separate the film guide from the platen unit as shown in Fig 3 30 Film guide Platen unit Fig 3 30 ...

Page 39: ... Assy Open the presser unit cover in the direction of the arrow Remove the 12 screws securing the presser unit assy on the main chassis to remove the presser unit assy as shown in Fig 3 31 Screws Screws Screws Screws Presser unit cover Fig 3 31 ...

Page 40: ...3 32 Retaining ring Presser plate hinge shaft Presser plate Retaining ring Retaining rings Presser frame sub assy Fig 3 32 While bending two claws A of the presser plate cover and the presser plate in the directions of the arrows remove the presser plate cover as shown in Fig 3 33 Presser plate cover Presser plate A A Fig 3 33 ...

Page 41: ...ft from the presser plate While bending the four claws in the directions of the arrows remove the presser lever cover as shown in Fig 3 34 Presser lever cover Presser plate Retaining ring Presser plate positioning shaft Presser lever Retaining ring Positioning presser plate Fig 3 34 ...

Page 42: ...he presser plate lever shaft and presser plate lock shaft out from the presser lever as shown in Fig 3 35 Presser plate lock shaft Presser plate lever shaft Presser lever Presser plate lock spring Presser plate lock Presser bearing Presser bearing Fig 3 35 ...

Page 43: ...r Remove the shutter front shutter rear and the two pinions 14 from the presser frame sub assy Remove the three screws to remove the shield plate rear and the size detection PCB assy from the shutter rear as shown in Fig 3 36 Shutter cover Shutter springs Tongue Shutter front Shutter rear Shutter front Shutter rear Size detection PCB assy Shield plate rear Screws Presser frame sub assy Retaining r...

Page 44: ...r springs from the grooves of the main chassis Remove the two retaining rings and pull out the rotation shaft in the direction of the arrow as shown in Fig 3 37 Head holder springs Head holder guide Rotation shaft Main chassis Head guide spring Retaining ring Retaining ring A Fig 3 37 ...

Page 45: ...rrow and remove the lever hook Remove the two retaining rings and pull out the head guide shaft in the direction of the arrow as shown in Fig 3 38 Lever shaft Lever hook Head guide shaft Compression springs Head holder guide Head holder Protection cover spring Lever hook return spring Fig 3 38 ...

Page 46: ...of the Gears and Pulleys Remove the gears and pulleys in the numerical order shown in Fig 3 39 Gear 50A Gear 44 Gear 25 Pulley 18 Pulley 25 Gear19 84 Á Gear 20 50 À Â Ã Gear 21 47 Ä Gear 68 Å Gear 20 50 Æ Gear 21 47 Ç Fig 3 39 ...

Page 47: ... on the main chassis to remove the motor holder sub assy Remove the two screws to remove the main motor from the motor holder sub assy Remove the two screws to remove the paper feed motor from the main chassis as shown in Fig 3 40 Paper feed motor Screws Motor holder sub assy Main motor Screws Main chassis Screws Fig 3 40 ...

Page 48: ...he paper feed roller Remove the clutch spring the washer and the retaining ring from the paper feed roller Remove the two retaining rings to remove the nip roller as shown in Fig 3 41 Driving roller Bearing Retaining ring Clutch spring Washer Retaining ring Bearing Retaining ring Bearing Retaining ring Bearing Paper eject roller spring Bearing Retaining ring Nip roller Retaining ring Bearing Retai...

Page 49: ... five screws securing the label guide assy on the main chassis and remove the label guide assy by pressing projections A and B of the label guide to release them from the holes as shown in Fig 3 42 Screw Main chassis Label guide assy A B Screws Screws Fig 3 42 ...

Page 50: ...ove the sensor bracket from the label guide Remove the two retaining rings to remove the ribbon cassette shaft from the label guide as shown in Fig 3 43 Label guide Label nip spring R Sensor bracket Screws Ribbon cassette shaft Label nip spring L Retaining ring Fig 3 43 ...

Page 51: ...ring the film path assy on the main chassis press two projections A of the film path to release them from the holes and remove the film path assy Remove torsion springs R and L Remove the two retaining rings to remove the nip roller as shown in Fig 3 44 Torsion springs R and L Paper feed roller Screws Film path assy Main chassis Bearing Retaining ring A Nip roller Screws Bearing Retaining ring A R...

Page 52: ...o remove the sensor bracket Remove the two magazine springs and the magazine lift sub assy while pressing parts A and B of the film path to release them as shown in Fig 3 45 Magazine lift sub assy Screw Magazine springs Outer plate shafts Outer plate Lock plate Retaining ring Sensor bracket Film path Return spring Screw B A Retaining ring Return spring Fig 3 45 ...

Page 53: ... two screws to remove the drawer connector from the main chassis as shown in Fig 3 46 Screws Drawer connector Main chassis Fig 3 46 Remove free bush 50 and free bushes 15 and 70 as shown in Fig 3 47 Free bush 50 Main chassis Free bush 15 Free bush 70 Fig 3 47 ...

Page 54: ...is Free bush 15 Free bush 70 Fig 3 48 Pass the drawer connector assy harness through hole A in the main chassis Insert the drawer connector into hole B and secure it with the two screws as shown in Fig 3 49 Note Insert the drawer connector so that its projection will be inserted into groove D of the main chassis Main chassis Drawer connector assy Projection Hole B Groove D Hole A Fig 3 49 ...

Page 55: ...into the holes in the magazine lift sub assy as shown in Fig 3 50 Magazine lift sub assy Parts A Film path Fig 3 50 Set the two magazine springs on two hooks B of the film path assy and then two hooks C of the magazine lift sub assy as shown in Fig 3 51 Hooks C Magazine lift sub assy Magazine springs Hooks B Film path assy Fig 3 51 ...

Page 56: ...path assy so that the two locating pins on the film path assy will be inserted into holes E in the sensor bracket and secure the film path assy with the two screws as shown in Fig 3 52 Holes E Locating pin Sensor bracket Film path Part D Film path Locating pin Sensor bracket Screws Fig 3 52 ...

Page 57: ...the return spring and the hole on the opposite side of the film path before setting the retaining ring on the outer plate shaft Note 1 The hook of the return spring must be between the ribs of the film path as shown in Fig 3 53 Retaining ring Film path Hook Outer plate shaft Return spring Film path Outer plate Ribs Outer plate Fig 3 53 ...

Page 58: ...n the lock plate the return spring and the hole on the opposite side of the film path before setting the retaining ring on the outer plate shaft Note 2 The hook of the return spring must be outside the rib of the film path as shown in Fig 3 54 Film path Film path Rib Return spring Lock plate Outer plate shaft Lock plate Return spring Fig 3 54 ...

Page 59: ...ends of the nip roller from the outside of the main chassis Set the film path in the main chassis and secure it with the seven screws Note 3 Insert the hooks of the torsion springs into the grooves of the nip roller Note 4 Make sure that part D of the outer plate is inserted into hole E in the main chassis as shown in Fig 3 55 Screws Torsion springs Nip roller Screws Paper feed roller Retaining ri...

Page 60: ...rom the inside and then pass end B through the hole on the opposite side of the main chassis Set the bearings and the retaining rings on both ends of the paper feed roller from the outside of the main chassis Insert the hook of the clutch spring into the groove of the bearing as shown in Fig 3 56 Retaining ring Paper feed roller Bearing Clutch spring Retaining ring Bearing Washer Retaining ring Ma...

Page 61: ...nd set the two hooks of the label nip spring L in hook A and then hook B of the label guide Set the ribbon cassette shaft on the label guide and set the two retaining rings on the ribbon cassette shaft In the same manner set label nip spring R as shown in Fig 3 57 Label nip spring L A B Label nip spring R Ribbon cassette roller Screws Sensor bracket Label guide Locating pin Locating pin Fig 3 57 ...

Page 62: ...guide assy in the main chassis Secure the label guide assy in the main chassis with the five screws Note 2 Make sure that two parts D of the label guide is properly inserted into the holes in the main chassis as shown in Fig 3 58 Screws Screw Screws Label guide Main chassis D D Fig 3 58 ...

Page 63: ...te 1 Check that ends A of the label nip springs make contact with parts B of the nip roller then apply grease to parts B of the nip roller Set the retaining rings on both ends of the nip roller from the outside of the main chassis Then set the paper guide on the sensor bracket as shown in Fig 3 59 Retaining ring Part B Nip roller Label nip spring Retaining ring Label nip spring Main chassis Label ...

Page 64: ...n the main chassis from the inside and end B of the paper feed roller into the hole on the opposite side of the main chassis while pressing the nip roller Set the bearings and the retaining rings on both ends of the paper feed roller from the outside of the main chassis as shown in Fig 3 60 Insert the hook of the clutch spring into the groove of the bearing Paper feed roller Clutch spring Washer R...

Page 65: ...n both ends of the paper eject roller Set the retaining ring on the left end of the roller and the paper eject roller spring on the other end of the roller as shown in Fig 3 61 Note 3 Fit the end of the paper eject roller spring in the groove of the bearing Note 4 Before setting the paper eject roller spring apply grease to the portion on the paper eject roller where the spring is to make contact ...

Page 66: ...main chassis and secure the motor holder sub assy on the main chassis with the three screws Set the paper feed motor in the hole in the main chassis so that the end of the harness will be at a lower position and secure the paper feed motor on the main chassis with the two screws Pass the paper feed motor harness to the outside of the main chassis through hole B from the inside of the main chassis ...

Page 67: ... C into the groove of gear 50A and set the retaining ring 6 Set pulley 25 and gear 19 84 on shafts F and G respectively and set the timing belt MXL belt B69 on pulley 25 and gear 19 84 Set the flanges and the retaining rings on shafts F and G 7 Set pulley 18 on shaft H Set the timing belt MXL belt 221 on shaft H and gear 44 and set gear 44 and the retaining ring on shaft I Set the flange and the r...

Page 68: ...ing Shaft H Pulley 25 Shaft F Shaft E Shaft G Shaft I Shaft J Shaft D Shaft A Shaft B Shaft C Gear 19 84 MXL belt B69 MXL belt 221 Gear 20 50 Gear 50A Clutch spring C Gear 25 Gear 44 Gear 21 47 Gear 68 Gear 20 50 Clutch spring A Gear 21 47 Fig 3 63 ...

Page 69: ...er spring then mount the retaining rings on both ends of the shaft Move the protection cover spring toward the end of the shaft then fit arm B of the protection cover spring in portion B of the head holder Assemble the head protection cover so that portions D fit over the head guide shaft then fit arm C of the protection cover spring in the hook of the head protection cover Head holder guide Hooks...

Page 70: ...er hook return spring and insert the lever shaft into the hole on the opposite side of the head holder guide in the direction of the arrow Then set the retaining rings on both ends of the lever shaft as shown in Fig 3 65 Lever hook Head holder guide Lever shaft Stopper Head holder guide Lever hook Lever hook return spring Head holder guide Fig 3 65 ...

Page 71: ...ssy head holder springs R and L and the hole on the opposite side of the main chassis and set the two retaining rings on the rotation shaft Set the hooks of head holder springs R and L on the projections of the main chassis as shown in Fig 3 66 Head guide spring Head holder assy Main chassis Head holder spring R Rotation shaft Retaining ring Head holder spring L Retaining ring Fig 3 66 ...

Page 72: ... on the shutter rear and secure them with the three screws Set two pinions 14 on the two shafts in the presser frame sub assy Set the shutter rear and then the shutter front as shown in Fig 3 67 Pinions 14 Shutter front Shutter rear Size detection PCB assy Shield plate rear Presser frame sub assy Fig 3 67 ...

Page 73: ... shutter rear to the centers of the pinion shafts Set the shutter front so that there will be no clearance between the ends of the ribs of the shutter front and those of the shutter rear as shown in Fig 3 68 Shutter front Shutter rear Fig 3 68 ...

Page 74: ...shaft through the presser frame sub assy and set the retaining rings and the bearings on both ends of the presser frame shaft Note 1 Make sure that the two pinion shafts of the presser frame sub assy are inserted into two holes A in the shutter cover as shown in Fig 3 69 Presser frame sub assy Shutter cover Shutter springs Presser frame shaft Hole A Bearing Retaining ring Retaining ring Bearing Fi...

Page 75: ...the presser plate lock spring into the hole C in the presser lever Pass the presser plate lever shaft through the presser plate and the presser lever Set the presser bearings on both ends of the presser plate lever shaft Set the presser lever cover on the presser lever Note 2 Make sure that two hooks B of the presser lever cover and the two locating pins are properly set as shown in Fig 3 70 Press...

Page 76: ...he direction of the arrow Pass it through the presser plate hinge spring the presser plate and the hole on the opposite side of the presser frame sub assy and set the four retaining rings as shown in Fig 3 71 Presser plate hinge spring Hinge shaft Presser frame sub assy Shutter cover Hook Fig 3 71 ...

Page 77: ...e presser jig assy part of the presser base assy at the specified position as shown in Fig 3 72A Note 4 Check that there is not any gap A between the main chassis and presser jig assy Locating pins Presser jig assy part of the presser base assy A Locating pin Locating pins Locating pin Locating pins Main chassis Fig 3 72A 2 Place the presser sub unit assy on the main chassis as shown in Fig 3 72B ...

Page 78: ...te Presser frame sub assy Fig 3 72C 4 Close the presser plate Note 5 Check that the presser plate is locked B as shown in Fig 3 72D Presser plate lock Presser frame shaft B Main chassis Presser sub unit assy Fig 3 72D 5 Align the presser frame sub assy with the main chassis at four portions C with no gap being allowed between them as shown in Fig 3 72C ...

Page 79: ... assy is aligned with the main chassis at four portions C with no gap being allowed between them as shown in Fig 3 72C Check that the harnesses including the FPC are not caught between the presser jig assy and presser frame sub assy Check that the presser frame sub assy and main chassis fit in four dented portions D on the presser side plates R L of the presser jig assy as shown in Fig 3 73A and F...

Page 80: ...Presser frame sub assy Side plate L Presser jig assy E E Fig 3 73C Check that the protrusion of the presser frame sub assy fit in the hole of the main chassis at two portions G as shown in Fig 3 73D G It is possible to check the item by taking a look G It is impossible to check the item by taking a look Presser jig assy part of the presser base assy Presser sub unit assy Presser frame sub assy Mai...

Page 81: ... 74A to 3 74B Note 8 Tighten those screws twice Presser sub unit assy Pressser jig assy Main chassis Screws Screws Screws Presser jig assy part of the presser base assy Main chassis Presser jig assy Screw Screws Fig 3 74B 9 Remove the presser jig assy Fig 3 74A ...

Page 82: ...ssis 11 Remove the presser jig assy part of the presser base assy and adjustment jig 12 Attach the presser plate cover to the presser plate as shown in Fig 3 74D Note 10 Check that two hooks and locating pins of the presser plate cover fit in the holes of the presser plate Presser plate cover Presser plate Hooks Main chassis Locating pins Fig 3 74C Fig 3 74D ...

Page 83: ... main chassis from the inside Then insert part B of the platen unit assy into the hole on the opposite side of the main chassis and insert the platen unit assy into the two grooves of the main chassis with the projection of the bearing turned upwards as shown in Fig 3 76 Set part C of the platen unit assy between the two ribs of the film path Platen unit assy Main chassis Bearing C A B Fig 3 76 ...

Page 84: ...III 62 Secure the platen unit assy with the two screws as shown in Fig 3 77 Screws Main chassis Platen unit assy Fig 3 77 ...

Page 85: ...rt part A of the xenon lock claw into hole B in the main chassis While bending the resin spring insert the two hooks of the xenon lock claw into two holes C in the main chassis Set hole D in the micro switch assy B for xenon reset on the emboss on the main chassis Screw the switch on the main chassis where hole E in the switch and the hole in the main chassis overlap Then secure the harness of the...

Page 86: ...the screw Pass the transparent sensor assy A harness through hole F in the main chassis and to the outside Insert transparent sensor assy B in the direction of the arrow and secure it on the presser unit assy with the screw Pass fastening band L100 through holes E and F and secure the harness coming out of hole E and F in the main chassis as shown in Fig 3 80 Head holder assy Transparent sensor as...

Page 87: ...t on the two embosses on the head holder and secure it with the two screws Pass the thermal head unit harness between the rotation shaft and the head holder guide and pass it through the hole in the main chassis and to the outside as shown in Fig 3 82 Thermal head unit Screws Fig 3 82 Secure the thermal head unit harness on the main chassis with fastening band L100 that is also used to secure the ...

Page 88: ...assy on the two hooks C of the bottom cover set the power supply PCB assy on the locating boss on the bottom cover and secure the power supply PCB assy on the bottom cover with the two screws as shown in Fig 3 83 Note Put on a static control wrist band before handling PCBs Power supply PCB assy Screw Bottom cover PS PCB shield plate Locating boss Screw A B C C Fig 3 83 ...

Page 89: ...onnector harness through hole B in the bottom cover Bundle all other harnesses coming out of the main chassis and pass them through hole A in the bottom cover Secure the harness of the transparent sensor assy B and the switch for the xenon cassette with the harness of the transparent sensor assy A and the switch for opening closing the cover using fastening band L100 as shown in Fig 3 85 Paper fee...

Page 90: ...ix screws Then set the two cores as shown in Fig 3 86 Locating boss Screws Screws Screws Locating boss Main chassis Bottom cover Fig 3 86 Set the ground wire on the main chassis and the PS PCB shield plate with the two screws as shown in Fig 3 87 Screw Bottom cover Ground wire PS PCB shield plate Screw Main chassis Fig 3 87 ...

Page 91: ... the back of the body cover and secure it on the body cover with the two screws Attach the control panel PCB harness on the body cover with a tape at two positions as shown in Fig 3 88 Screws Core Screw Body cover Control panel PCB holder Control panel PCB assy Core Body cover Two positions where the harness is attached with a tape Control panel PCB harness Fig 3 88 ...

Page 92: ... in the bottom cover set the body cover on the bottom cover and secure it with the six screws Set the eject cover and the slide lever on the body cover as shown in Fig 3 89 Bottom cover Control panel PCB harness Eject cover Screws Slide lever Screws Body cover Fig 3 89 ...

Page 93: ...ooks of the cassette cover on the head holder guide and secure it with the two screws as shown in Fig 3 90 Note Make sure that the two locating bosses and hooks are properly set Hook Screws Locating bosses Cassette cover Head holder guide Head holder guide Body cover Fig 3 90 ...

Page 94: ... and connect it to the connector of the power supply PCB assy Connect connector D coming out of the bottom cover to connector B of the capacitor case Set the capacitor case on the bottom cover and secure it with the four screws as shown in Fig 3 91 Bottom cover Screws Main chassis Ground wire Connector B Connector A Connector D Capacitor case Screws Connector C Capacitor case rank number Fig 3 91 ...

Page 95: ...mber of printing times light emission times of xenon lamp 4 Press the SET key and the LCD unit displays C BOX RANK Current setting 5 Check the rank printed on the capacitor box The capacitor case rank is printed at the bottom of the case Example 8E29 11000 D Rank A to J Capacitance Mf g No 6 Set the capacitor case rank according to the printed rank by pressing the MODE key The rank display changes...

Page 96: ... in Fig 3 92 Bottom cover Shield plate Power supply PCB harness Control panel PCB harness Paper feed motor harness Size detection PCB harness Fig 3 92 Secure the main PCB assy on the main PCB bottom plate with the five screws as shown in Fig 3 93 Note Put on a static control wrist band before handling PCBs Main PCB assy Main PCB bottom plate Fig 3 93 ...

Page 97: ...n detection Automatic feed position detection Manual feed detection Paper feed motor Thermal head Power supply PCB Control panel PCB Xenon unit detection release sensor Power supply PCB Room temperature detection Fig 3 94 Set the ground wire of the main PCB assy on the main chassis with the screw Secure harnesses A and B in hook C of the bottom cover as shown in Fig 3 95 Harness A Harness B Ground...

Page 98: ...III 76 Secure the main PCB bottom plate on the bottom cover with the four screws as shown in Fig 3 96 Screws Screws Main PCB bottom plate Bottom cover Fig 3 96 ...

Page 99: ...urn the machine over with the right side up and press the open button on the cassette cover to open the cassette cover Set the ribbon cassette assy and close the cassette cover as shown in Fig 3 97 Body cover Cassette cover Ribbon cassette assy Fig 3 97 ...

Page 100: ...eassembly of the Xenon Unit Assy Insert the xenon unit assy into the machine at its right side as shown in Fig 3 98 Note Insert the xenon unit assy all the way until it is locked Body cover Xenon unit assy Fig 3 98 ...

Page 101: ...e in the machine in the direction of the arrow as shown in Fig 3 99 Magazine tray assy Body cover Fig 3 99 2 21 Reassembly of the AC Cord and the I F Cable Set the AC cord and the I F cable in the back of the machine as shown in Fig 3 100 AC cord Serial I F cable Parallel I F cable Fig 3 100 ...

Page 102: ...l amount of grease to the portion where the main chassis makes contact with the torsion springs R and L Portion A Nip roller Amount Apply small amount of grease to the portion where the main chassis makes contact with the label nip spring Portion C Main chassis Amount Apply small amount of grease to the dented portions of the main chassis A B A B B B C C A Portion B Paper feed roller Amount Apply ...

Page 103: ...re the presser plate lock shaft presser lever and presser plate lock make contact with each other Presser lever Presser plate lock Portion F Hinge shaft Amount Apply small amount of grease to the portion where the hinge shaft presser plate and presser frame make contact with each other D E F Fig 3 102 G Main chassis Portion G Paper eject roller Amount Apply small amount of grease to the portion wh...

Page 104: ...nd the failure and if it related to two or more components well understand their relationship before carrying out the repair 3 If the xenon tube does no emit light possible causes are the failures of the xenon unit and the main capacitor charge PCB The xenon unit can be disassembled However never disassemble the main capacitor unit as it poses a danger 4 In case of a failure related to the thermal...

Page 105: ...ct direction _ Is a draft sheet set in the correct position of the magazine tray Draft sheet set in the incorrect position Set the draft sheet in the correct position of the magazine tray _ Does any draft sheet or ID label remain in the machine body Draft sheet or ID label remaining in the film path Remove the draft sheet or the ID label _ Is there any foreign matter present in the film path Forei...

Page 106: ...he broken timing belt MXL belt CHAPTER III 1 15 Disassembly of the Gears and Pulleys 2 6 Reassembly of the Gears and Pulleys Non of the above Defective sensor or PCB Electronic part The paper feed motor or the main motor does not rotate preventing a draft sheet or an ID label from being fed Is the connector of the paper feed motor or the main motor dis connected YES Disconnected connector of the m...

Page 107: ...onic part Blurred or partial printing is performed Does any dust or thumb mark adhere to the printing surface of a draft sheet or an ID label Reprint on a new draft sheet or a new ID label _ Is the ink ribbon wrinkled or torn Defective ink ribbon Straighten the ink ribbon to reprint If the ink ribbon is severely wrinkled or torn replace the ink ribbon cassette _ Is the head dirty Dirty head Clean ...

Page 108: ... Electronic part The printing surface is insufficiently fused after Is the printing surface of the holder flawed or dented Defective printing surface of the holder Engrave stamp with a new holder _ engraving stamp Is the surface of the transparent plate of the xenon unit dirty Dirty surface of the transparent plate Clean the surface with a soft cloth If the dirt or blur can not be removed replace ...

Page 109: ...I 1 2 INTERFACE SPECIFICATIONS I 1 3 POWER SUPPLY SPECIFICATIONS I 2 4 DISPLAY SPECIFICATIONS I 2 5 SWITCH SPECIFICATIONS I 3 6 CHARGE SPECIFICATIONS I 3 7 DETECTION SPECIFICATIONS I 3 CHAPTER II GENERALS II 1 1 CONFIGURATION OF THE ELECTRONIC PART II 1 2 ELECTRONIC PCB II 1 3 MOTOR II 2 4 THERMAL HEAD II 2 5 LCD II 2 ...

Page 110: ...ircuit III 9 1 12 5V Power Supply Circuit Stabilization Circuit III 10 1 13 LCD Control Circuit III 10 1 14 Charge Discharge Control Circuit III 11 1 15 Size Detection Open Cover Detection and Key Scanning Circuit III 12 1 16 Room Temperature Detection Circuit III 15 1 17 Xenon Unit Release Detection Circuit III 15 1 18 Xenon Unit Detection Circuit III 16 1 19 Reflective Sensor Circuit III 17 1 20...

Page 111: ...ACTIONS TO BE TAKEN AFTER REPAIRS IV 1 APPENDIX A Main PCB Circuit Diagram 1 2 APP 1 B Main PCB Circuit Diagram 2 2 APP 2 C Control Panel PCB Circuit APP 3 D 100V AC System Power Supply Circuit APP 4 E 200V AC System Power Supply Circuit APP 5 F Main Capacitor Charge PCB Circuit APP 6 ...

Page 112: ...INTERFACE SPECIFICATIONS 1 Windows interface Bidirectional parallel interface Win95 NT Complies with IEEE1284 level 1 Operates in compatibility and nibble modes Connector 36 pin Centronics parallel interface connector with a 0 085 inch pitch 2 Mac interface Serial interface Complies with RS 422A Transfer rate 57600 bps Connector 8 pin Mini Din connector 3 Win 95 NT Serial interface Complies with R...

Page 113: ... 5V 4 Power supply switch Seesaw switch 4 DISPLAY SPECIFICATIONS 1 LCD Use Character type Number of 15 columns 1 line characters displayed Construction of 5 dots 7 dots the cursor a character Number of guidances 14 both vertical and horizontal Display method TN type Lighting method Reflection method Display form Positive Dimensions Glass dimensions 67 5 mm W 18 mm H Dot dimensions 0 524 mm W 0 58 ...

Page 114: ...or Photo interrupter 3 Position detection sensor Photo interrupter 4 Manual feed detection sensor Photo interrupter 5 Automatic feed position Photo interrupter detection sensor 6 Size detection sensor 5 detection switches 7 Stamp position detection sensor Detection switch 8 Open closed shutter Detection switch detection sensor 9 Trigger detection sensor Photo interrupter 10 Room temperature Thermi...

Page 115: ...n 2 Power supply PCB 100V or 200V system This PCB equipped with a switching regulator stabilizes at 8V and 25V fluctuating AC current voltage and supplies it to the main PCB 3 Main Capacitor Charge PCB This PCB charges the capacitor at 330V in response to charge signals output from the main PCB to cause the xenon tube to emit light or forcibly discharges the capacitor in response to power supply O...

Page 116: ... an ID label label from the manual insertion opening or the magazine tray to the platen It is a φ25 unipolar motor at a drive voltage of 25V 4 THERMAL HEAD It is a thin film thermal printer head with a built in driver circuit consisting of 960 heating elements These heating elements perform printing when they are energized drive voltage 19V 5 LCD It is a LCD that displays up to 15 columns 1 line a...

Page 117: ... detection Serial I F cable Parallel I F cable Control panel PCB Room temperature detection P8 Not used P9 Open cover sensor P10 Xenon unit release and detection sensor P11 Ribbon sensor P12 Printing position detection sensor P13 Light emission trigger detection sensor P14 Paper feed motor P15 Manual feed detection sensor P16 Automatic feed position detection sensor Fig 2 1 Configuration of the El...

Page 118: ...II 4 Fig 2 2 Block Diagram of the Electronic Part ...

Page 119: ... Two 1 Mbit SRAMs 11 and 12 µPD431000AGW or equivalents are used These SRAMs serve as working areas for a printer buffer 3 Gate array The gate array 13 µPD65612 053 provides an interface between the CPU and the SRAMs controls the main motor and sensors and provides a parallel interface and expanded I O 1 2 EEPROM Circuit Fig 3 1 shows the EEPROM circuit The EEPROM 21 is a ROM into which data can b...

Page 120: ... to the thermal head It is latched on the driver IC of the thermal head by the LAT signal and the heating elements of the thermal head are energized by the STB signal The thermistor on the thermal head is connected to the analog input port AN0 of the CPU to detect the temperature of the heat radiation plate of the thermal head Fig 3 2 Thermal Head Drive Circuit ...

Page 121: ...ol Circuit Receiving the 25V input from the power supply PCB the thermal head power supply control circuit generates the output voltage of the switching regulator 17 MC34166T according to the thermal head voltage control signal output from P61 of the CPU By adjusting the volume resistance at VR1 1KΩ the thermal head voltage is set at approximately 19V ...

Page 122: ...uit Main Motor Fig 3 4 shows the main motor drive circuit The φ42 48 division stepping motor is used to feed a draft sheet or an ID label from the platen to the eject opening The drive circuit is bipolar Fig 3 4 Main Motor Drive Circuit ...

Page 123: ...t sheet or an ID label from the manual insertion opening or the magazine tray to the platen The drive circuit is unipolar Fig 3 5 Paper feed Motor Drive Circuit 1 7 Main Oscillation Circuit Fig 3 6 shows the main oscillation circuit This circuit contains an oscillator and generates an oscillation at 16 MHz basic clock for the CPU Fig 3 6 Main Oscillation Circuit ...

Page 124: ...III 6 1 8 Sub Oscillation Circuit Fig 3 7 shows the sub oscillation circuit This circuit generates a clock for a serial transfer Fig 3 7 Sub Oscillation Circuit ...

Page 125: ... 5V power supply voltage Vcc increases when the power supply is supplied by the turning on of the power supply switch When this Vcc reaches point A the reset IC is activated and the signal at the RESET terminal passes from L level to H If the Vcc becomes less than 4 2V when the power supply is cut by the turning off of the power supply switch the signal at the RESET terminal passes from H level to...

Page 126: ...vel signals into RS 232C signals The RXD signal is a print data input signal from the computer and transferred at 57 6 K baud rate The TXD signal is a status information output signal to the computer and the DTR signal is a busy signal The RXD signal indicates that power is supplied to the SC 2000 Fig 3 10 Serial Interface Circuit ...

Page 127: ... Interface Circuit Fig 3 11 shows the parallel interface circuit The address space for the gate array 13 is used to input and output data which provides a Centronics parallel interface Fig 3 11 Parallel Interface Circuit ...

Page 128: ...ed by the power supply PCB Fig 3 12 5V Power Supply Circuit 1 13 LCD Control Circuit Fig 3 13 shows the LCD control circuit This circuit reads and writes the data status by using 4 bit data signals LD4 LD7 and control signals LCDC RS signal LCDC R W signal and LCDC E signal from the main PCB to the control panel PCB Fig 3 13 LCD Control Circuit See the control circuit for LCDC RS signal LCDC R W s...

Page 129: ...arge Discharge Control Circuit The active level for each signal is Charge signal H Light emission signal H Discharge signal L Charge completion signal L The charge voltage SO signal synchronized with the charge voltage CLK signal is used for the serial transfer of the charge voltage setting to the charge PCB ...

Page 130: ...458 1850 2260 2770 and 4090 and draft sheets come in one type totaling 12 types These types are distinguished by ON OFF signals output from switches 0 5 on the size detection PCB Table 3 1 Relationship between the Stamp ID Its Size and the Detection Switches Stamp ID Size Status of the detection switches 0 1 2 3 4 5 0 r r r r r 1 1212 r r r r 2 2020 r r r r 3 r r r 4 1438 r r r r 5 r r r 6 r r r 7...

Page 131: ...2260 r r 26 2770 r r 27 4090 r 28 r r 29 r 30 r 31 Draft sheet The size detection circuit reads the ON OFF status through key scanning It also detects the ribbon cassette and the open cover and reads the ON OFF status of the Mode and Set keys through key scanning Fig 3 15 shows the size detection ribbon cassette open cover detection and key scanning circuit ...

Page 132: ...III 14 Fig 3 15 Stamp Size Detection Open Cover Detection and Key Scanning Circuit ...

Page 133: ...Ω 1 is fixed The potential at the R76 chip thermistor is output to the analog input port AN1 of the CPU to detect temperature Fig 3 16 Room Temperature Detection Circuit 1 17 Xenon Unit Release Detection Circuit Fig 3 17 shows the xenon unit release detection circuit The setting and removal of the xenon unit are detected by ON OFF signals output from the micro switches Fig 3 17 Xenon Unit Release ...

Page 134: ...Fig 3 18 shows the xenon unit detection circuit With the xenon unit that connects each of xenon unit signals Xe UNIT 0 2 with Xe UNIT this circuit can handle different levels of the light of the xenon tube Fig 3 18 Xenon Unit Detection Circuit ...

Page 135: ...d of the cassette ribbon are detected In the automatic feed position detection it is judged whether the feed position of a draft sheet or an ID label is correct In the manual feed detection the presence of a draft sheet or an ID label that is fed manually and the size of an ID label are detected Fig 3 19 Reflective Sensor Circuit ...

Page 136: ...he transparent sensor circuit In the printing position detection the printing start position is detected In the trigger detection the light emission trigger of the xenon tube is detected by closing the presser unit cover Fig 3 20 Transparent Sensor Circuit ...

Page 137: ... motor It is also input into switching regulator MC34166 which generates the thermal head voltage 3 CONTROL PANEL PCB CIRCUIT Fig 3 21 shows the control panel PCB circuit 1 is a dot matrix LCD driver controller to display characters 15 columns 1 line are displayed with 5 dots 7 dots comprising one character The built in oscillation circuits and R10 generate a basic clock for drive signals Timing s...

Page 138: ...III 20 Fig 3 21 Control Panel PCB Circuit ...

Page 139: ...it on the main PCB The set voltage is used to charge the capacitor that stores energy necessary to cause the xenon tube to emit light as electric charges It is also used to discharge the electric charges stored in the capacitor 5 SIZE DETECTION CIRCUIT Fig 3 22 shows the size detection circuit SW0 detects the shutter and SW7 detects the stamp SW1 2 3 4 and 5 detect the stamp sizes 0 1 2 3 4 respec...

Page 140: ...ASSY CIRCUIT Fig 3 23 shows the reflective sensor assy circuit Fig 3 23 Reflective Sensor Assy Circuit 7 TRANSPARENT SENSOR ASSY CIRCUIT Fig 3 24 shows the transparent sensor assy circuit Fig 3 24 Transparent Sensor Assy Circuit ...

Page 141: ...d the failure and if it related to two or more components well understand their relationship before carrying out the repair 3 If the xenon tube does not emit light possible causes are the failures of the xenon unit and the main capacitor charge PCB The xenon unit can be disassembled However never disassemble the main capacitor unit as it poses a danger 4 In case of a failure related to the thermal...

Page 142: ...l head Replace the thermal head CHAPTER III 1 3 Thermal Head Drive Circuit NO Defective 17 and 19 Replace the main PCB assy CHAPTER III 1 4 Thermal Head Power Supply Control Circuit The size of a stamp can not be correctly detected Are the stamp size detection switches properly turned on off YES Defective 13 Replace the main PCB assy CHAPTER III 1 15 Size Detection Ribbon Cassette Open Cover Detec...

Page 143: ...or assy CHAPTER III 7 TRANSPARENT SENSOR ASSY CIRCUIT The xenon tube does not emit light Does the light emission trigger detection sensor function correctly YES Defective xenon unit or main capacitor unit Replace the xenon unit or the main capacitor unit CHAPTER III 4 MAIN CAPACITOR CHARGE PCB CIRCUIT NO Defective transparent sensor assy Replace the transparent sensor assy CHAPTER III 7 TRANSPAREN...

Page 144: ...APP 1 ...

Page 145: ...APP 2 ...

Page 146: ...APP 3 ...

Page 147: ...APP 4 D 100V AC System Power Supply Circuit ...

Page 148: ...APP 5 E 200V AC System Power Supply Circuit ...

Page 149: ...APP 6 ...

Page 150: ...Sep 98 5V5014BE0 Printed in Japan ...

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Summary of Contents for SC-2000

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Brother SC-2000, Service Manual, Page: 119 / 150

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Summary of Contents for SC-2000

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