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Integra CROMA24 User's Manual

1. 0 DOA 5 M m B 33MOd ONIHOIIMS Inan INANI 2v E NVID SAINAI JOURS w OTEK Sod UNNES z 6 arava 8 AS Ss 19 2 QNO t Ha a3dvd 119 er ir v v noa 5 Fiz 20 aneyg INS T2UdO Figure 3 36 Signal Wiring Diagram Maintenance 78 Troubleshooting 4 Introduction Chapter 4 Troubleshooting consists of a table that is intended to aide the technician in troubleshooting the Croma24 printer This table addresses symptoms with their possible causes and solutions Basic troubleshooting skills will be required to perform the symptom identification troubleshooting fault isolation and repair of the printer when using this table Ensure that all applicable software diagnostic tests have been properly executed all visual indications including LED status have been observed and all applicable pushbuttons have been depressed to obtain a complete list of symptoms to be applied to the table below Use the table in conjunction with Chapter 3 Maintenance whenever the table prompts you for additional
2. 117 Install the Power Supply and AC Entry Module 120 Chapter 6 Parts List EF qa Cuba cii 123 I qe 131 12 Croma24 Service Manual List of Illustrations Figure Page Chapter 1 General Description Chapter 2 Theory of Operation 2 1 General Block 26 2 2 27 2 3 Carrier Axis Drive 0 4 0 000 0 28 2 4 Main Printed Clrc iti Board 2 rati reta niic enda 29 2 5 eL 30 2 6 Stepper Motor Controller 1 2 0 1 1 2 eiiis ed apie ees 33 2 7 Servo Motor Controller esses ennemis 34 2 8 Quadrature Signal Generato Msa srsisni niaaa aa 35 2 9 Interface Circuits uniaan UNAN 36 2 10 Carrier Assembly Circuits 2 2 23 20 a a a E 37 2 11 Croma24 System Ground Network Left 39 2 12 Croma24 System Ground Network Right Side 40 2 13 Front Key Controls 44 000 40 3 3 1 Encoder Strip
3. 207197 6 1 10 SLIDE SHAFT sssini 206480 6 1 11 SERVICE STATION ASSEMBLY 204629 6 1 12 CUTTER 206812 2 13 PLATEN PETER 206546 6 2 1 SERVO MOTOR 207034 62 gt LIGHT PIPE 207031 E 123 Croma24 Service Manual 124 FIGURE ITEM 6 2 6 2 6 2 6 2 6 2 6 2 6 2 6 2 6 2 6 3 6 3 6 3 6 3 6 3 6 3 6 3 6 4 6 4 6 5 6 5 Parts List W e O N e Ne OU B U N PART NAME PART 207030 MAIN PRINTED CIRCUIT BOARD 207047 LOWER DRIVE SHAFT ASSY 206479 FAN ASSEMBLY 203443 POWER SUPPLY ASSEMBLY 207042 ROLLGUIDE ASSY RIGHT 204969 5 ROLLGUIDE ASSY LEFT 206828 4 PEET tiere deste a 207041 ASSEMBLY 207040 COVER CARRIER 207038 CARRIERIPCB 207088 ENCODER SENSOR W FLEX 206823 PAPER SENSOR W FLEX 207180 STRAIN RELIEF rrt tne 204694 CARRIER BUSHING SET OF 2 207961 CARRIER FRAME ASSY 207077 ENCODER STRIP oinnes 206384 PINCH ROLLER ASSY tete 207071 STEPPER MOTOR W GEAR 207173 BRACKET STEPPER MOTOR clar 206854 1 BRACKET STEPPER MOTOR LEFT 206854 2 H
4. 0 46 3 2 Cartridge Dimple Region aiaa aai a 47 3 3 Flex Cable Contacts eren ace 48 3 4 MPCB Connection 50 3 5 Carrier PCB Connection enn 51 3 6 Ribbon Connector Locking 51 9 7 Servo 52 8 Stepper can em 53 3 9 Examples ol Banding 2 54 3 10 Color Calibration 3 11 Deadband Fast Slow serisinin nennen nnne 56 3 12 Upper Roller Support Description 2 57 3 13 Upper Roller Mountliig 5 ecco tree tee eoe cotta ipee 59 3 14 Gap ot PINCH Roller acie Deere 59 3 15 Upper Roller Adjustment 24220 60 3 16 Carrier Head Height Tolerance 61 13 Croma24 Service Manual List of Illustrations cont Figure Page Chapter 3 Maintenance cont 3 17 3 18 3 19 3 20 3 21 3 22 3 23 3 24 3 25 3 26 3 27 3 28 3 29 3 30 3 31 3 32 3 33 3 34 3 35 3 36 Setting Up Tools from Height Gauge 61 Zeroing the Micrometer 62 Test Cartridge Installed eiui c eio ipto 62 Carrier Position
5. 3 Reconnect the power cord and interface cable ENCODER STRIP COTTON SWAB Figure 3 1 Encoder Strip Cleaning 46 Maintenance Croma24 Service Manual Cartridge Dimple Cleaning Cartidge Dimples Figure 3 2 Cartridge Dimple Region The cartridge dimple area can easily be contaminated by oils and dirt on fingers and hands or ink spilled onto them This causes the cartridges to not receive some of the electrical signals for a proper firing of the jets This be seen as a misfiring of the cartridge NOTE Care should be used when handling the cartridges Avoid touching the cartridges on the dimple area or the inkjet holes on the bottom The oils and dirt fingers and hands can contaminate the area and re sult in misfiring of the inkjets 2 gt z 9 m Clean the cartridge dimple area by gently dabbing the area with a lint free cloth or cotton swab saturated with isopropyl alcohol Maintenance 47 Croma24 Service Manual 48 Flex Cable Contact Cleaning Figure 3 3 Flex Cable Contacts Cleaning the flex cable contact area is very important due to the ease of which this area can become dirty This also causes the cartridges to not receive all of the electrical signals for a proper firing of the jets This be seen as misfiring of the cartridge NOTE Care should be used when handling the flex cable con tact area Avoid touching the contact are
6. Deadband calibration compensates for minute differences created when bidirectional printing is used Unidirectional printing is not affected by deadband There are four types of deadband tests slow deadband fast deadband fast deadband vertical lines all and fast deadband vertical lines one Figure 3 11 Deadband Slow Fast Figure 3 11 shows what the display will look like when printing either the fast or slow test if it is out of alignment A correctly aligned printer will appear as if there is only a series of vertical lines printed No difference between the three segments of lines would be apparent The SLOW DEADBAND calibration is a precision test that checks the firing time of the jets as related to the forward and reverse direction Maintenance Croma24 Service Manual X Axis Calibration The X axis calibration procedure ensures that the processing that drives the stepper motor is correct to minimize line length accuracy errors Pinch Roller Adjustment Procedure The purpose of the Paper Skew Adjustment is to make certain that the Pinch Roller in the Upper Roller Support stays centered on its shaft and or has a gap when the Lower Roller is rotated forward for approximately two full revolutions In other words the Pinch Roller should not drift rapidly to the left or to the right when the Lower Roller is rotated forward for two full revolutions Slow drifting is acceptable Use the torque screwdriver with the PO
7. CONTROL lt MICRO dm PANEL gt PROCESSOR APRENDE CARRIER ASSEMBLY GATE ARRAY POWER MEMORY SUPPLY gt CIRCUITS MPCB LOWER STEPPER PAPER AXIS DRIVE DRIVE MOTOR ASSEMBLY LEGEND ELECTRICAL CONNECTION MECHANICAL CONNECTION MAIN DATA BUS lt gt Figure 2 1 General Block Diagram 26 Theory of Operation Croma24 Service Manual Paper Media Axis Drive STEPPER PINCH ROLLERS MOTOR PAPER LOWER DRIVE SHAFT ASSY REDUCTION GEARS T E 29 Figure 2 2 Paper Media Axis Drive The Paper Media Axis Drive moves the plotting media in a direc tion perpendicular to the length of the printer This friction drive utilizes a micro step drive technology and consists of a stepper motor reduction gears lower drive shaft assembly and pinch wheels This can be seen in Figure 2 2 The micro step technology associated with the stepper motor gives the capability of a resolution up to 600 dpi The reduction gear meshes the stepper motor to the lower drive shaft assembly which allows the media to advance or retract The purpose of the pinch wheels is to apply pressure to the media onto the drive shaft assembly to reduce the chance of slipping Misaligned pinch wheels is the main cause of skewing of the media Theory of Operation 27 Croma24 Service Manual The Carrier Axis Drive 28 ENCODER ST
8. Push the right end of the Trailing Cable back down into the hole the Platen and reconnect the end to J 6 on the MPCB Depress the back of the Frame Tensioner and wrap the Carrier Belt over the Servo Motor pulley Make sure that the guides on the inside of the belt are inserted in the pulley grooves and that the belt is not twisted Move the Carrier Assembly back and forth to check the Carrier Belt tension Assembly Disassembly Croma24 Service Manual 11 Perform the Reinstall the Left Middle and Right Covers procedures to reinstall the Left Middle and Right Covers Remove the Carrier Assembly Carrier Belt and the Frame Tensioner Figure 5 3 Electronics Cover Removal 1 Perform the Left Middle and Right Cover Removal procedures to remove the Left Middle and Right Covers 2 Remove the Cutter Actuator by reaching under the Platen and releasing the actuator support tabs g o gt o lt KIGINASSV 3 Move the Carrier Assembly to the far left side of the Slide Shaft Assembly Disassembly 95 Croma24 Service Manual 4 Lift up on the front left side of the Electronics Cover until it comes part way off of the Carrier Assembly Then lift up on the front right side of the Electronics Cover and move the Electronics Cover slightly to the left so that the back of it clears the Trailing Cable Support Assembly See Figure 5 3 5 Lift up on the connector lock to unlock the Trailing Cable
9. These banding lines are generated by the software when incorrectly interpreting the paper advancing ink firing sequence of the expected print file Because it is not directly tied to a mechanical movement the bands become inconsistent in both frequency and duration The possible causes are the printer driver the original software package or the RIP if used To eliminate the chance that it is the printer driver 1 Remove RIP or network systems and connect the printer directly to the computer 2 Print a test file approved by ENCAD that uses only the printer driver software and the ENCAD printer If thetest file prints correctly the problem lies in either the software package that generated the print or the RIP if used Maintenance Croma24 Service Manual Alignments Adjustments The ENCAD 24 printers are designed with a minimum of maintenance requirements in mind Most of the adjustments are controlled and performed via software firmware interaction that require you to run a subroutine and enter values on the computer Programmed calibrations include color calibration deadband alignment and X axis calibration The mechanical adjustment requirements include the pinch roller adjustments and the encoder strip height adjustments No electrical alignments are required Color Calibration This procedure describes how to check that the cartridges are properly aligned for color plotting amp should be followed each
10. Croma24 User Guide P N 207103 Copies of this and other ENCAD Inc publications may be obtained by contacting your nearest authorized ENCAD Inc dealer or by contacting ENCAD s Technical Support and Service Department Electrostatic Discharge ESD Sensitivity 18 All PCBs Printed Circuit Boards associated with the Croma24 printers have components sensitive to ESD electrostatic dis charge Care must be taken to avoid damage to any of the compo nents by following current ESD handling procedures and practices Always use an approved ESD grounding strap when handling or working with PCBs General Description Croma24 Service Manual Warnings Cautions and Notes Warnings cautions and notes are used when additional informa tion instructions or care should be observed In this manual warnings cautions and notes precede the text to which each ap plies The definition of each is provided below WHANAD m D U m z WARNINGS Warnings are used to stress that the following steps or procedure has the potential to cause serious harm or death to service personnel Extreme care should be observed when following the procedures and to exercise standard safety procedures They are indicated by WARNING Followed by a paragraph describing the concern CAUTION Cautions depict that the following steps or procedures can cause damage to the equipment if not properly followed Ex treme care should be o
11. IDLER PULLEY ASSEMBLY SIDE WITH THICKER OUTER RING OF PLASTIC MUST FAGE UP Figure 5 6 Installation of Frame Tensioner 12 Holding the Carrier Belt and Frame Tensioner insert the Idler Pulley Assembly into the loop of the belt Make sure that the side of the Idler Pulley Assembly with the thicker outer ring of plastic is facing up See Figure 5 6 Assembly Disassembly 99 Croma24 Service Manual 13 14 15 16 17 18 Once the Idler Pulley Assembly is in position pinch the belt to hold the Idler Pulley Assembly in place and pull it into the Frame Tensioner so that the axle rests in the V shaped groove in the Frame Tensioner Insert the Compression Spring into the opening in the back of the Frame Tensioner so that the end of the spring fits over the post inside the opening Fit the Compression Spring over the post at the back of the C Bracket Fit the notch in the front end of the Frame Tensioner over the notch in the front of the C Bracket Depress the back of the Frame Tensioner and slip the Carrier Belt over the Servo Motor pulley Make sure that the guides in the Carrier Belt are properly fitted over the Servo Motor pulley Gently move the Carrier Assembly from end to end and make sure that the Carrier Belt is not rubbing against any other parts Remove the Carrier PCB 100 1 Integrated circuits may become weakened or damaged by electrical discharge Do not touch or work near integrated
12. compatable versions Only the Centronics parallel connection exists on the CAD only version Commands sent from the host computer are Encad RTL format Drivers are supplied to support Windows based PC s 3 XX 95 and NT as well as Macintosh and Power PC computers These printers expand upon ENCAD s tradition of delivering fast high quality color or monochrome graphics for a variety of applica tions ENCAD has made significant advances in designing these 17 Croma24 Service Manual plotters to respond to and anticipate our customers needs Principal features are summarized below Three Versions CAD GA Graphic Arts GA amp CAD ENCAD s software RIP supplied with the GA Graphic Arts version Remotely Configured via Host Computer 25 63 6 cm Maximum Media Width 600 x 600 dpi mono addressable 300 x 300 dpi color Overview Printers draw according to instructions issued from a host com puter Every printer is engineered to understand a specific set of instructions and to execute each instruction in a precise manner In addition most printers are designed to execute predetermined characters automatically without a specific line by line instruction from the program These characters are part of the printer s permanent memory Related Publications The following publication contains additional information which may be useful in servicing the ENCAD Inc Croma24 Color Inkjet Printers ENCAD Inc
13. encoder strip bad encoder sensor worn carrier bushings loosetrailing cable connections perform Slide Shaft Cleaning procedure replace servo motor bad bearings replace servo motor remove obstruction perform Encoder Strip Cleaning procedure o I jo 2 replace encoder strip replace encoder sensor replace carrier bushings reseat trailing cable connections at the MPCB and the carrier assembly Troubleshooting 81 Croma24 Service Manual Table 4 1 Troubleshooting Table cont Symptoms Carrier Axis Failure cont Does Not Print Ink Cartridge Misfiring 82 Troubleshooting cutter assembly malfunction damaged carrier drive belt system bad connection between computer and printer firmware is corrupted bad MPCB cartridge low on ink flex contacts dirty or damaged replace cutter assembly 1 check idler tension assembly 2 check carrier belt reseat cable connections on computer and printer refresh EEPROM firmware with new download replace MPCB refill or replace cartridge 1 perform Flex Cable Contact Cleaning procedures 2 replace carrier assembly Table 4 1 Troubleshooting Table cont Symptoms Ink Cartridge Misfiring cont Paper Skewing cartridge dimple area dirty or damaged cartridge not seated correctly bad cartridge service station dirty or not properl
14. J on the MPCB 10 Connec and lock the Trailing Cable connector to J 6 on the MPCB 11 Reinstall the Middle and Right Covers by performing steps 2 through 4 of the Reinstall the Left Middle and Right Covers procedure Remove Servo Motor 1 Perform the Left Middle and Right Cover Removal procedures to remove the Left Middle and Right Covers 2 Disconnect the Servo Motor connector red and blue wires at the J 4 location on the MPCB PUSH IN HERE TO SLACKEN CARRIER BELT Figure 5 2 Frame Tensioner 3 Depress the back of the Frame Tensioner see Figure 5 2 to create slack in the Carrier Belt and slip it off of the Servo Motor pulley 92 Assembly Disassembly Croma24 Service Manual 4 Move the Carrier Belt to the left so it is out of the way of the Servo Motor pulley 5 Move the Carrier Assembly to the left end of the Slide Shaft Integrated circuits may become weakened or dam aged by electrical discharge Do not touch or work near integrated circuits without wearing an ESD wrist strap 6 Put on ESD wrist strap 7 n order to have access to the back screw on the Servo Motor it is necessary to disconnect the Trailing Cable from the MPCB and lift up the right end of the Trailing Cable Disconnect the Trailing Cable connector at the J 6 location on the MPCB 8 Lift up gently and hold the right end of the Trailing Cable 9 Using a 2 Phillips screwdriver remove the back screw on the Servo
15. Motor The screwdriver will be at a slight angle Be careful not to strip the head of the screw or to cause damage to the Encoder Strip 10 Lower the Trailing Cable back into place 11 While holding the Servo Motor remove the front screw on the Servo Motor g o gt o lt 1419 3557 12 Tilt the bottom of the Servo Motor towards the back of the Platen and carefully lower the motor through the opening and out of the back of the printer Assembly Disassembly 93 Croma24 Service Manual Install Servo Motor 94 10 Integrated circuits may become weakened or damaged by electrical discharge Do not touch or work near integrated circuits without wearing an ESD wrist strap Put on an ESD wrist strap Reinsert the Servo Motor under the Platen with the connector facing the FRONT side of the Platen Guide the pulley up through the opening in the Platen Once the Servo Motor pulley is through the Platen push up on the Servo Motor and align the screw holes with the screw hole openings Insert the front screw into the Servo Motor and tighten it almost all the way Lift up gently and hold the right end of the Trailing Cable Insert the back screw into the Servo Motor and tighten it Make sure the screw does not go into the motor at an angle and be careful not to strip the head of the screw or to cause damage to the Encoder Strip Tighten both screws on the Servo Motor to 15 of torque
16. bit to adjust the Pinch Roller mounting screws The maximum torque requirement is Lin lbs 0 5 m gt z 9 m PINGH ROLLER ASSEMBLY LEFT MOUNTING SCREW RIGHT MOUNTING SCREW AS SEEN FROM BEHIND THE PRINTER Figure 3 12 Upper Roller Support Description 1 Figure 3 12 shows the Upper Roller Support and the mounting screws Stand behind the printer in order to adjust the mounting screws on the Upper Roller Supports Maintenance 57 Croma24 Service Manual 2 Become familiar with the actions and results shown in Table 3 1 Note that these actions are performed from behind the printer Table 3 1 Pinch Roller Adjustments ACTION RESULT 1 Turn mounting screw 1 Screw is loosened counterclockwise ccw 2 Turn mounting screw 2 Screw is tightened clockwise cw 3 Loosen left mounting screw 3 Roller moves to the right turn ccw 4 Tighten left monting screw 4 Roller moves to the left turn cw 5 Loosen right mounting screw 5 Roller moves to the left turn ccw 6 Tighten right mounting screw 6 Roller moves to the right cw 7 Not maintaining downward 7 The upper roller support pressure towards the floor on will not be perfectly level and the head of each mounting screw will not perform its function at the same time as you loosen or properly tighten the screw Each mounting screw must be completely at the bottom edge of its hole in the back of
17. circuits without wearing an ESD wrist strap Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Removal procedures to remove the Carrier Assembly from the Slide Shaft Put on an ESD wrist strap Unlock the connectors and remove all flex cables on the Carrier PCB Ensure that the ferrite remains on the black cartridge flex cable Assembly Disassembly Croma24 Service Manual ASSEMBLY DISASSEMBLY Figure 5 7 Carrier PCB Removal nstallation left end of the Carrier PCB from the slot in the Carrier lift up the right end of the Carrier PCB See Figure5 7 Assembly 4 Unlock the latch on the right end of the Carrier Assembly and 5 Slide the Carrier PCB to the right to remove the tab on the 101 Assembly Disassembly Croma24 Service Manual Failure to use an approved anti static bag for storage or shipment may cause damage to the Carrier PCB and affect the Warranty 6 Place the Carrier in an ESD bag anti static bag in preparation for shipment to ENCAD for replacement or repair or if it is to be stored at your facility for repair Install the Carrier PCB 1 Put the tab on the left end of the Carrier PCB into the slot in the left side of the Carrier Assembly See Figure 5 7 2 Ensure that no flex cables are underneath the Carrier PCB 3 Push down the right end of the Carrier PCB until the latch snaps into place 4 Reattach all flex cables on the Carrier PCB Ensure that the
18. dears the top of the left post NKIGINASSV g o o lt Push the Carrier Belt away from the right post of the Belt Clamp and gently lift up to finish removing the Carrier Belt from the Belt Clamp Assembly Disassembly 97 Croma24 Service Manual Failure to use an approved anti static bag for storage or shipment may cause damage to the af fect the Warranty 14 Place the Carrier Assembly in an ESD anti static bag in preparation for shipment to ENCAD for replacement or repair or if it is to be stored for repair at your facility Install the Carrier Assembly Carrier Belt and the Frame Tensioner 1 To install the Belt onto the Carrier Assembly the bumps on the belt where the ends of the belt are joined together to make the belt continuous must be positioned between the left and right posts of the Belt Clamp See Figure 5 5 2 Slide the Carrier Belt between the right post and the middle post and guide it down into the Belt Clamp Then slide the Carrier Belt between the left post and the middle post and finish placing the Carrier Belt into the Belt Clamp 3 Check the position of the Carrier Belt to make sure it matches Figure 5 5 4 Make sure the left end of the Trailing Cable extends out beyond the left end of the Trailing Cable Support Assembly 5 Slide the Carrier Assembly onto the left end of the Slide Shaft making sure that the Encoder Strip fits into the slot i
19. eid 69 pe e CREE 69 Carriage Vibration 70 Color ER 70 Keypad rri 71 LED TEST tmm 72 Servo Motor lest ie E 72 Paper Motor TeSt 73 Semic MENU nes 74 B lt ln Test BIT TEX 75 Croma24 Service Manual Table of Contents cont Chapter 3 Maintenance cont Firmware Software Upgrades sess eene nennen nnns 76 Internal Cabling and Signal Flow Diagram seen 77 Chapter 4 Troubleshooting 79 EEUU 79 ROWEN MM e 79 Media Does Not eT 80 Carrer Axis Fall le creer ea des 81 DOSS oisi 82 Ink Cartridge Misfiring 82 lere cioe E 83 Printer Output is nnne nnns 84 Fan Does Not Power Up seen tias Dead 85 Chapter 5 Assembly Disassembly 87 ELS 87 Remove the Left Middle Lid and Right 88 Install the Left Middle and Right 89 Remove the MPCB Main Printed Circuit Boa
20. ferrite remains on the black cartridge flex cable 5 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Reinstallation procedures to reinstall the Carrier Assembly Remove the Paper Sensor or the Encoder Sensor 1 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Removal procedures to remove the Carrier Assembly from the Slide Shaft 102 Assembly Disassembly Croma24 Service Manual TO REMOVE PAPER SENSOR BOARD GRASP HERE AND PULL UP PUSH DOWN ON CLIP PUSH ON ENCODER THEM PLILL CLIT THIS PIECE OF PLASTIC ONE ON EACH SIDE MUST CLEAR THE RIDGES ON THE UNDERSIDE OF HOLDER Figure 5 8 Paper and Encoder Sensor Removal 2 remove the Paper Sensor a Unlock the connector at 3 and remove the flex cable b Turn the Carrier Assembly over and hold it while firmly grasping the Paper Sensor between thumb and index finger See Figure 5 8 c Pull straight up on the Paper Sensor and remove it from the Carrier Assembly KIGINASSV gt 2 7 w lt 3 To remove the Encoder Sensor a Unlock the connector at J 2 and remove the flex cable b Turn the Carrier Assembly over and lay it with the top side facing down c Push down on the plastic clip and at the same time push down on the Encoder until the plastic pieces on each side of Assembly Disassembly 103 Croma24 Service Manual the Encoder clear the
21. information This information may be in the form of an illustration additional data or a procedure that needs to be performed Im Table 4 1 Troubleshooting Table gt w z m Symptoms d No Power faulty power replace power cord cord AC input not replace AC entry present at power module supply 79 Croma24 Service Manual 80 Table 4 1 Troubleshooting Table cont Symptoms No Power cont Media Does Not Move Troubleshooting all DC output voltages not present see Figure 3 18 for voltages all DC voltages present at MPCB perform Stepper Motor Winding Resistance check rough motion while spinning stepper motor pinch rollers not adjusted correctly paper sensor not responding media control switches on printer are operating correctly bad MPCB 1 check fuse on power supply 2 replace power supply replace MPCB replace stepper motor bad bearings replace stepper motor adjust pinch rollers replace paper sensor Croma24 Control Panel corrupted reinstall Control Panel replace MPCB Croma24 Service Manual Table 4 1 Troubleshooting Table cont Symptoms Carrier Axis Failure dirty or lubricated slide shaft perform Servo Motor Winding Resistance check check servo motor for smooth movement obstruction in path of carrier may or may not be visible dirty encoder strip damaged
22. inspection of the condition of the printer only no adjustments can be performed while the BIT mode Firmware Software Upgrades 76 The Croma24 Control Panel Printer Driver and embedded firmware are all upgraded onto the computer at the same time by installing the latest Croma24 software bundle The latest version can be found on ENCAD s bbs or website the phone numbers are located Chapter One The installation procedure will upgrade the Control Panel and the Printer Driver simultaneously Verify that the upgrade was success ful by checking in the about panel in both the Control Panel and the Driver for version specs Maintenance Croma24 Service Manual The latest firmware version was included and installed onto the computer during the installation process To upgrade the firm ware on the printer open the Control Pane with the printer online During the initial start up of the Control Panel it commu nicates with the printer s firmware The Control Panel is collect ing information stored on the printer such as current ink levels and the firmware version If the Control Panel finds an older version of firmware it automatically installs the latest version that is stored on the computer This communication between the Control Panel and the printer happens every time that the Control panel is opened NOTE The printer s firmware will revert back to version 1 the original version if power is removed from the
23. of Operation 2 1 Front Key Control LED Codes Chapter 3 Maintenance 3 1 Pinch Roller Adjustments 3 2 Keypad Test Indications Chapter 4 Troubleshooting 4 1 Troubleshooting Chapter 5 Assembly Disassembly Chapter 6 Parts List 6 1 6 2 cepe se eeu 16 General Description 1 Introduction This manual provides service information for the ENCAD Inc 24 Color Inkjet Printer f 9 oz Zim 5 1 gt There are three versions to the Croma24 Color Inkjet Printer family CAD version GA amp CAD version GA version for CAD market GA amp CAD GA 1 0 parallel serial amp parallel serial amp parallel includes ENCAD software RIP All versions will have an ADI Windows driver and print utility This manual is written for service personnel who possess analog and digital circuitry experience Chapter 2 Theory of Operation should be read and thoroughly understood before troubleshooting calibrating the printers The printers support pre cut and roll media Media size is auto matically determined and harddip limits are set accordingly Pre cut media uses different maximum plotting areas than roll media See the Printer Specifications for more details Both RS 422 serial and Centronics parallel connections are pro vided to interface with the host computer on the GA Graphic Arts
24. out If no paper is sensed the paper sensor sends this information to the MPCB which immediately begins an out of paper subroutine This subroutine starts the LEDS on the printer to blink green blinks slow while yellow blinks faster It also informs the host computer of the situation and stops the printer from printing until more media is loaded The sensor also checks for the size of the media loaded so it can determine the proper printing parameters Power Supply An internal UL recognized switching power module supplies power for the Croma24 printer It provides a constant 5 VDC and 24 VDC output from input voltage in the range of 90 264 VAC The 24 V supply is used for the stepper controller which advances the paper the servo controller which moves the Carrier and power to fire the inkjets The 5V supplies power to the logic circuits The power supply is fused using a 2 A 250 V fast blow type fuse The outputs share a common ground which is isolated from earth ground within the supply itself Earth ground and DC ground are connected external to the power supply The power supply will shut down under overload short circuit condi tions on any output over the full range of input voltage Overvoltage protection is 2096 3096 above nominal for the 5 V and 24 V outputs System Grounding 38 Due to the amount of plastics used in the manufacturing of the printer a system of grounding the metal assemblies to each other is
25. printer for any reason m 2 gt Z e m assure that the latest version is loaded onto the printer it is a good practice to run a Prime every morning that the printer is to be used This forces the user to open the Control Panel which verifies that the latest version of firmware is loaded It also helps the cartridges to purge any possible obtructions within the jets before clogging begins by firing all the jets for a period of time Internal Cabling and Signal Flow Diagram Figure 3 36 is a schematic of the major components and the cabling associated between them The diagram depicts component boards or assemblies jack connections cables and signal flow It is to be used by the technician as an additional aid in trouble shooting and improve understanding of the printer theory of operation Maintenance 77 Croma24 Service Manual AFGHANO Avct i 733 S PECHE EEE OYUVMIDYE 15 avoles cuvmMyod O 0 ind 7 aoaaa 10 43MOdsS 1 05 za lt
26. pulse of 24 V is generated When the current goes above the output of the wave form generator the pulse turns off Every time the output of the waveform generator is changed by the microprocessor the motor moves 1 micro step Each circuit contains four main blocks see Figure 2 6 1 Reference waveform generator The microprocessor uses a D A digital to analog converter to set the desired level for the current in the stepper motor winding The output of the D A converter varies in time to create a reference waveform This reference waveform is centered around 10 V Theory of Operation 33 Croma24 Service Manual 34 2 Motor current sense The voltage across a series current sense resistor is measured and level shifted so that it is centered around 5 3 Comparator This portion divides the output of the reference waveform gen erator by two and compares it to the output of the motor current sensor Logic inside the gate array generates the control signals for the power driver that applies voltage across the motor wind ing in order to make the actual current match the reference waveform 4 Power driver An H bridge allows the supply voltage to be applied across the winding in either polarity to drive the current to the desired value Servo Motor Controller ENCODER CARRIER CONNECTOR CARRIER Figure 2 7 Servo Motor Controller The Carrier Assembly is driven by the Servo Motor T
27. required If no common ground was in place the potential of electric shock could exist due to static voltage buildup on the individual assemblies The system grounding network ensures that all metallic assemblies have the same ground potential Figures 2 11 and 2 12 show how the ground straps are implemented on the printers Theory of Operation Croma24 Service Manual T E 29 GROUND STUD KCPNUTS GROUND LUG GROUND LUGS TO POWER SUPPLY C BRACKET SLIDE SHAFT AND SLIDE SHAFT SUPPORT BRACKET a PART OF BASE Figure 2 11 Croma24 System Ground Network Left Side Theory of Operation 39 Croma24 Service Manual Figure 2 12 24 System Ground Network Right Side Front Key Controls The Control Panel see Figure 2 13 is located on the lower right side of the printer and consists of five controls and two LED indicators The controls are from left to right Backward Load Forward Cut and Power Table 2 1 lists all possible indications allowed using the LEDs and the conditions that generated that indication EE wx 2 BACKWARD LOAD FORWARD CUT POWER Figure 2 13 Front Key Controls 40 Theory of Operation Croma24 Service Manual Table 2 1 Front Key Control LED Codes DESCRIPTION Ready to print Blinking fast Processing Blinking slow Error i e media out or ink empty follow computer prompts Te H 0 AYO
28. serial communications with a Macintosh serial port is compatible with RS 422 devices when ate adapter cableis used This cableis available from ENCAD Theory of Operation Croma24 Service Manual Carrier Assembly Circuits OPTICAL ENCODER DRIVERS CARTRIDGE 3 CARTRIDGE 4 OPTICAL SENSOR TRAILING CABLE m PAPER SENSOR To TRAILING CARRIER EX CABLE PCB CONNECTION Eeg ROM 2 CARTRIDGE 1 INKJET CARTRIDGE 2 CARRIER ASSEMBLY Figure 2 10 Carrier Assembly Circuits The Carrier Assembly contains 1 Carrier PCB 2 Optical Sensors 3 Paper Sensor 4 Inkjet Cartridges The Carrier PCB contains the logic and drive circuitry for the firing of the inkjet cartridges It also establishes an interface path for the optical sensor and paper sensor to communicate with the MPCB The optical sensors receive their inputs from the optical encoder strip and sends this data tothe MPCB The MPCB uses this information to determine the horizontal position of the carrier assembly so that accurate printing can be established The paper sensor circuitry senses for the presence of loaded media It does this automatically during the start up and load sequences It Theory of Operation 37 Croma24 Service Manual also constantly monitors the media during printing to determine if the media has run
29. the Main PC Board Memory expansion is not available for this printer Sinceit only supports EN RTL language additional memory is not required or beneficial Serial EEPROM Serial EEPROM is an Electrically Erasable Programmable Read Only M emory which provides storage for calibration constants and user configuration data entered from the host computer A 1K bit serial nonvolatile EEPROM stores calibration and configu ration information It retains data whilethe unit is off Theory of Operation Croma24 Service Manual Stepper Motor Controller DAIABUS gt D A CURRENT STEPPER DATA BUS CONVERTER COMPARATOR DRIVER SENSE MOTOR Figure 2 6 Stepper Motor Controller The media is driven by a Stepper Motor which drives the media in a direction perpendicular to the length of the printer The media in the printer can advance forward and backward depending upon the commands which the Stepper Motor receives from the micro processor T E 29 The Stepper Motor Controller contains two identical circuits one for each winding of the stepper motor The circuit is a combination of two simpler types of circuits and can be thought of as a variation of either one A digital to analog D A converter receives digital data from the CPU and generates a sine wave output This signal is fed into comparator circuit that measures the current through the winding of the stepper motor If the current is too low a
30. time the ink cartridges installed Figure 3 10 is a representation of how a color calibration looks when printed m gt z 9 m RE Y c te M Ho OT TOT OTT T hh Current Heads Y M C Figure 3 10 Color Calibration Maintenance 55 Croma24 Service Manual 56 The Current Heads Y M C view represents the alignment of the heads as they are currently entered This is just an overview of all heads and how they are aligned Do not attempt to align the heads using this view The Color Horizontal H ead to H ead Calibration checks the align ment of the nozzles horizontally and allows corrections when re quired J ust enter the value below the set of lines that are correctly aligned careful that you are aligning the correct color by observ ing the C cyan M magenta and Y yellow on the right side of the plot The Color Vertical Head to Head Calibration checks the alignment of the nozzles vertically and allows corrections when required J ust enter the value below the set of lines that are correctly aligned Be careful that you are aligning the correct color by observing the C cyan M magenta and Y yellow on the right side of the plot Deadband Alignment
31. 23 Chapter 2 Theory of 25 25 24 Printer General Block 25 Paper Media Axis Dive EE addict 27 The Carrier Axis 0 24 4 0 0 nennen nnne nennen 28 Main Printed Circuit Board 29 30 Gate Ur 30 Memory enint iiaa 31 Stepper Motor 33 Servo Motor Controller ener nnne 34 Interface Circuits Serial amp Parallel sse 36 Carrier Assembly nennen nennen nnne 37 38 System Grounding erii ten etes baee dese 38 Front KEY 40 Chapter 3 MalnfenaliCB sino x RE LM QUEE UU MM i rid exin R 43 MOGUCOM enaa 43 Scheduled a eaaa aE 43 GIS AMING 44 External Cleaning 44 Slide Shalt 44 Croma24 Service Manual Table of Contents cont Chapter
32. 3 Maintenance cont 10 Service Station Cleaning si 45 Linear Encoder Strip 0 46 Cartridge Dimple Cleaning 1 aaa aai 47 Flex Cable Contact 0 48 Clean and Inspect Stepper Motor Gears 48 Clean and Inspect 49 Clean and Inspect Carrier 49 Reseat Connectors on MPCB and Carrier 50 Replace Garrier BUSHINGS incorrese de 52 Servo Motor Winding Resistance Check sse 52 Stepper Motor Winding Resistance 53 Banding Hardware vs 2 53 Alignments Adj sStmMe nts idee aioe 55 ere roger 55 Deadbard Aligriment 56 X AxiS GallDEAtiOn Lider 57 Pinch Roller Adjustment Procedure seen 57 Head Height Alignment Procedure sssssseeeeeenneenn 60 Croma24 Control Panel sited cna aA nu EU Im SEE aus ee 65 Manufacturing 2 66 Print Quality 6St 67 67 DIAGNOSTICS MENMU 68 Paper Sensor Test oet ii ora
33. 452 3768 ENCAD Website http www encad com Additional information is available though our Technical Support and Service Department s Help Desk ENCAD Inc Technical Support amp Service Dept 6059 Cornerstone Court West San Diego CA 92121 Help Desk Telephone 619 452 4350 Help Desk FAX 619 546 0659 International Users contact your local ENCAD service provider see details on your ENCAD registration card General Description 23 Croma24 Service Manual This Page Intentionally Left Blank 24 General Description Theory of Operation 2 Introduction This chapter explains the mechanical and electrical theory of opera tion of the ENCAD Croma24 D Size Color Inkjet printer The Croma24 is a MC68322 microprocessor based digital printer that receives plotting instructions from a host computer through either the RS 422 serial interface or the Centronics parallel inter face E E 29 Croma24 Printer General Block Diagram Figure 2 1 illustrates the major functional areas of the printer The 24 printer consists of two mechanical drives 1 Paper Media Axis Drive 2 Carrier Axis Drive and three main electrical assemblies 1 MPCB Main Printed Circuit Board 2 Carrier Assembly 3 Power Supply 25 Croma24 Service Manual SERVO L pprpavenpur LL MOTOR CARRIER AXIS DRIVE PAPER SENSOR f ENCODER READER
34. ARDWARE KIT 208995 Croma24 Service Manual Figure 6 1 Croma24 Assembly Parts Platen and Above Parts List 125 151 SLYVd Croma24 Service Manual Figure 6 2 Croma24 Assembly Parts Below Platen 126 Parts List vice Manu Croma24 Ser PARTS LIST arrier Assembly Breakdown Figure 6 3 C 127 Parts List Croma24 Service Manual Figure 6 4 C Bracket Assembly Breakdown 128 Parts List Croma24 Service Manual U gt 70 Figure 6 5 Lower Roller Assembly Breakdown Parts List 129 Croma24 Service Manual This Page Intentionally Left Blank 130 Parts List axis drive carrier 28 paper media 27 banding 84 hardware or software 53 built in test BIT 75 C cabling 77 calibration color 55 deadband 56 67 head height 60 X axis 57 carrier assembly 95 carrier axis failure 81 carrier bushings 108 cartridges 47 55 cautions 19 control panel 40 65 E ESD 18 F features 18 firmware 31 G general block diagram 25 ink cartridge misfiring 82 L language emulation 20 line accuracy 20 linear encoder strip 46 lower roller assembly 112 media does not move 80 menus diagnostics 68 manufactoring 66 microprocessor 25 mpcb 29 49 90 N no power 79 notes 19 O o
35. Bushings in until they snap into place 7 Perform the Reinstall the Carrier Assembly Carrier Belt and the Frame Tensioner procedures to reinstall the Carrier Assembly IN ESI EET g o gt o lt Assembly Disassembly 109 Croma24 Service Manual Remove the Service Station Seals and Wipers SEAL POST WIPER WIPER SUPPORT RETAINING RING SLED ACTUATOR TAB BASE SLED SPRING Figure 5 13 Service Station Exploded View 1 Place the Middle Cover in the open position 2 Move the Carrier Assembly to the left side of the Slide Shaft 3 Reach into the Right Cover and pull back on the Service Station release tab located on the far side of the Service Station See Figure 5 13 4 Raise the right side of the Service Station out of the Platen 5 Lift out the left side of the Service Station from the Platen and remove the Service Station Moving the Service Station 110 Assembly Disassembly Croma24 Service Manual farther to the right might be required to release the left side of the Service Station 6 To remove a Service Station Wiper lift the Wiper up and off of the Wiper support 7 To remove a Service Station Seal a Disconnect the Sled spring from the post on the bottom of the Service Station Sled See Figure 5 13 b Slide the Service Station Sled to the right and up until it is removed from the Service Station Base c While pushing the Service Station S
36. COLOR PRINTER SERVICE MANUAL This Page Intentionally Left Blank ENCAD Croma24 COLOR INKJET PRINTER SERVICE MANUAL Croma24 Service Manual Copyright 1995 and 1996 ENCADS Inc All rights reserved ENCAD is a registered trademark of ENCAD Inc CROMA24 is a trademark of ENCAD Inc Other trademarks and registered trademarks are the property of their respective owners No part of this manual may be copied or distributed transmitted transcribed stored in a retrieval system or translated in any human or computing language in any form or by any means electronic mechanical mag netic or otherwise or disclosed to a third party without the express written permission of ENCAD Inc 6059 Cornerstone Court West San Diego CA 92121 U S A Printing history 1st Edition Rev A May 1997 Croma24 Service Manual FCC Statement U S A The United States Federal Communications Commision has specified that the following notice be brought to the attention of the users of the Croma24 printers FEDERAL COMMUNICATIONS COMMISION RADIO AND TELEVI SION INTERFERENCE FOR CLASS B DEVICE This equipment has been tested and found to comply with the limits for a class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not ins
37. GREEN LED AMBER LED Maintenance 71 Croma24 Service Manual The test is selectable in duration The available time selections are 5 10 20 30 40 50 60 90 120 180 240 or 300 seconds 10 or 30 minutes or 1 hour LED Test Test Time Selection 30 Seconds Test Figure 3 30 LED Test The LED Test lights both LEDs on the printer The test is selectable in duration The available time selections are 5 10 20 30 40 50 60 90 120 180 240 or 300 seconds 10 or 30 minutes or 1 hour Servo Motor Test Servo Motor Test Figure 3 31 Servo Motor Test 72 Maintenance Croma24 Service Manual The Servo Motor Test tests the servo motor by moving the carrier back and forth across the slide shaft Speed is selectable to either slow or fast The number of cycles the carrier does is selectable between 0 and 10 000 cycles Paper Motor Test Media Motor Steps x Tech Notes of Use Selectthe number of steps to move the paper motor This will move the paper from 0 to 1 inch motor step is 1 300 of an inch Move Paper Motor by 50 steps Cancel m z gt 2 9 m Figure 3 32 Paper Motor Test The Paper Motor Test tests the stepper media motor by moving the paper forward by a selected number of steps The number of steps is selectable between 0 and 300 steps At 0 steps the media will not advance at all Mai
38. ND STUD KEPNUTS GROUND LUG GROUND LUGS TO POWER SUPPLY TO C BRACKET SLIDE SHAFT a PART OF BASE AND SLIDE SHAFT SUPPORT BRACKET Figure 5 17 Ground Stud With Ground Lugs Attached 13 Disconnect the ground lug from the ground stud See Figure 5 17 14 Remove the Power Supply Assembly by unhooking it from the two plastic hooks securing it to the Base and sliding it out 15 Loosen the 4 screws and slip the Power Supply cover off of the Power Supply base See Figure 5 18 16 Disconnect the cable from TB2 on the Power Supply Board Assembly Disassembly Croma24 Service Manual 17 Disconnect the AC Entry Module from the Power Supply Board by disconnecting cable from TB1 18 Remove 4 screws and washers securing power supply board and remove power supply board Remove grounding wire to the AC Entry Module from the mounting screw on the power supply lower cover 19 Remove AC Entry Module by unsnapping from the power supply base Figure 5 18 Power Supply Assembly IN ESI EET n gt 2 7 w lt Assembly Disassembly 119 Croma24 Service Manual Install the Power Supply and AC Entry Module 1 10 11 Insert the AC Entry Module by snapping it into the Power Supply base Install Power Supply board into the Power Supply base using four mounting screws and washers Attach the ground wire from the AC Entry Module to the lower Power Supply cover mounting screw Connect the AC Entry Module
39. NTROLLER CARRIER PCB T 39 29 SERVO ARRAY CONTROLLER SERIAL EEPROM lt MEMORY CIRCUITS PARALLEL INTERFACE CIRCUITS SERIAL Figure 2 4 Main Printed Circuit Board The Main Printed Circuit Board MPCB consists of six functional areas 1 Microprocessor CPU 2 Gate Array 3 Memory Circuits 4 Stepper Motor Controller 5 Servo Motor Controller 6 Interface Circuits Serial amp Parallel Theory of Operation 29 Croma24 Service Manual Microprocessor The microprocessor a Motorola MC68322 is the central processor unit which supervises system functions executes the printer firm ware manipulates data and controls input output data busses It has a built in parallel port a two channel DMA Direct Memory Access controller timer module clock generator and an on board chip select generator One DMA channel supplies data to the gate array for jet firing the other DMA channel is used to receive data through the serial port via the gate array or the serial port when using a high speed serial mode One timer generates a servo inter rupt every millisecond The microprocessor halves the 40M Hz crystal reference X1 signal to create the 20M Hz system clock that is used for timing of all internal circuitry The chip select generator is programmed to generate chip selects at the appropriate addresses with the appropri
40. RIP SERVO ASSY MOTOR Figure 2 3 Carrier Axis Drive The Carrier Axis Drive moves the printer s carrier assembly along the length of the printer The drive consists of a servo motor linear encoder strip drive belt and tension assembly These items are illustrated in Figure 2 3 servo motor drive belt and tension assembly the compo nents that actually drive the carrier assembly The servo motor drives the belt back and forth allowing the attached carrier assembly to be repositioned as required The tension assembly is spring controlled and allows the proper amount of tension on the belt The linear optical encoder strip is used to obtain the printers accu racy along the axis of the printer It is made with 150 parallel lines per inch etched into it By utilizing two optical encoder sensors that are slightly off set from each other and reading the leading and trailing edges of the lines a resolution of 600 dpi can be obtained The stepper and servo motors are controlled from the main printed circuit assembly by the microprocessor Theory of Operation Croma24 Service Manual Main Printed Circuit Board MPCB CRYSTAL Xl STEPPER CO
41. SHL Blinking slow Error corrected Blinking slow Error follow computer prompts Off Printer is in sleep mode soft off Theory of Operation 41 Croma24 Service Manual This Page Intentionally Left Blank 42 Theory of Operation Maintenance 3 Introduction This chapter contains general maintenance and cleaning instruc tions for the Croma24 printer Scheduled Maintenance Scheduled maintenance consists of a list of checks that are planned to be performed on a regular basis or when conditions warrant it Scheduled maintenance can be thought of as preventive mainte nance since its purpose is to prolong the life of the printer It is not E intended to repair or isolate an existing problem though it can z sometimes be helpful in detecting a condition due to a weakened component that has not yet completely failed 2 Below is list of scheduled maintenance checks and their periodic e ity Clean external areas weekly or as required Clean slide shaft monthly Clean service station biweekly Clean encoder strip monthly Clean cartridge dimples if prime fails Clean flex cable contacts if prime fails or cartridge is replaced Clean and inspect motor gears annually Clean and inspect MPCB annually Clean and inspect carrier assembly annually Reseat connectors on MPCB annually Reseat connectors on carrier board annually Replace carrier bushings biannually 43 Croma24 Service Manual Cleanin
42. a because the oils on your skin can contaminate the area and result in misfiring of the inkjets Clean the flex cable contacts by gently dabbing the area with a cotton swab soaked with isopropyl alcohol Clean and Inspect Stepper Motor Gears The stepper motor gears can become dirty and after time if not cleaned could cause wide banding in the print or paper skewing This will reduce the quality of the intended output Clean the motor Maintenance Croma24 Service Manual gears with a stiff brush to knock off any debris A cotton swab soaked with isopropyl alcohol can be used to remove any ink that may have accumulated on the gears Clean and Inspect MPCB Foreign material on the MPCB could short out electrical signals being developed on the MPCB and cause erroneous prints or even damage to the MPCB electrical circuits should be free of foreign material especially those with conductive properties Clean the MPCB by blowing the objects away or gently brush them aside with a soft brush if required Inspect the MPCB for any damage to the board connections or any of the components on the board Replace board if inspection reveals any damage or flaws that could effect the function of the MPCB Clean and Inspect Carrier Assembly Z gt 2 9 m Foreign material on the carrier assembly could short out signals being developed on the carrier assembly and cause erroneous prints or even damage to the carrie
43. als are also required NKIGINASSV g o gt o lt Isopropyl Alcohol Cotton Swabs Lint Free Cloth or Tissue Double Sided Tape 1 16 thick 3 4 wide Loctite Blackmax P N 200172 A Hardware Kit is available for the printers See Chapter 6 of this manual for the part number 87 Croma24 Service Manual Always turn the printer OFF remove the power cord and theinterface cable before beginning any disasembl y procedures An electrical shock hazard may be present if these precautions are not followed Remove the Left Middle Lid and Right Covers 88 Removing the Left Cover allows immediate access to the left side of the Platen for removal of the Carrier Assembly Carrier Drive Belt Tension Assembly and the Cutter Activator Removing the Right Cover provides immediate access to the Main Printed Circuit Board MPCB Control Panel Servo Motor and the MPCB connections to the Stepper and Servo Motors Fan Trailing Cable and Power Supply The Middle Cover Lid needs to be removed before any of the other covers can be removed It also gives access to the Carrier Assembly and the Service Station when in the open position 1 Remove Cover Retaining Clips 2 from the Middle Lid Cover Insert a Needle Nose Pliers into the square openings near the back of the Lid and remove the Retaining Clip 2 Put the Middle Cover Lid in the open position by lifting the front of the Middle Cover to t
44. ardous requiring no special disposal handling It can be harmful if swallowed and should be kept away from children To obtain a Material Safety Data Sheet contact ENCAD Inc at 6059 Cornerstone Court West San Diego CA 92121 3734 619 452 4350 International users should contact their local dealer or distributor Croma24 Service Manual WARRANTY OR DAMAGE CLAIMS United States ENCADS Inc warrants its printers to be free from defects in workmanship and materials for a period of one year from the date of purchase In order to submit a Warranty claim please contact the ENCAD Help Desk at 619 452 4350 ENCAD reserves the right to make changes or improvements to Products without incurring any obligation to similarly alter Products previously purchased Buyer s sole and exclusive rights pursuant to this Warranty shall be for the repair or replacement of defective Product ENCAD specifically disclaims any and all other warranties expressed or implied including but not limited to implied warranties of merchantability and fitness for a particular purpose In no event shall ENCAD be liable for any loss of profit or other commercial damages special incidental or consequential damages or any other damages or claims whatsoever This Warranty gives Buyer specific legal rights and Buyer may also have other rights that vary from state to state This Warranty applies only to printers purchased from ENCAD or aut
45. as necessary to ensure an accurate alignment Maintenance Croma24 Service Manual Croma24 Control Panel During the installation procedures for the Croma24 a software Control Panel for this printer is installed onto the computer This control panel provides a means to monitor and adjust certain vari ables utilized by the printer These variables include ink levels in the cartridges color calibration adjustments Other items that can be accomplished at the control panel are media movement forward backward media standard selections cutting the media priming the cartridges access cartridge moves the Carrier to the middle of the Platen for changing cartridges etc The printer control panel also has a hidden maintenance menu that has been developed with subroutines to aide the technician in troubleshooting and to assure the quality of the printed output products m 2 gt 2 9 m All menus depicted in this section have been derived from the Win dows95 Control Panel version Other versions of the Control Panel may look slightly different but have the same functionality The maintenance subroutines are hidden and should be performed by competent technicians only To make the Maintenance Menu appear 1 Open or execute the Croma24 s Control Panel program 2 At the About Croma24 menu simultaneously type S while holding down the Alt key Maintenance 65 Croma24 Ser
46. ate data size byte word and with the appropriate number of wait states Gate Array SERIAL PORT SERVO CONTROLLER TO CARRIER PCB Figure 2 5 Gate Array 30 Theory of Operation Croma24 Service Manual The gate array contains the hardware logic for dot firing monitor ing changes in the Carrier Assembly position controlling DMA for the serial port and generating the PWM Pulse Width Modulation waveforms for the servo controller The gate array is a Xilinx device It is a static RAM based field programmable gate array This means that the logic that it imple ments is determined by configuration information in internal RAM storage Each time power is turned on this information must be downloaded from the system ROM This type of gate array allows for the flexibility of upgrading the logic by simply downloading the new system software E 29 Memory Circuits Memory is used to retain large amounts of information This information is stored in the device memory in the form of binary bits Printer memory consists of Flash EEPROM DRAM and EEPROM Maximum installable memory is as follows DRAM 2MB Flash EEPROM 1 MB Serial EEPROM 1 KB Flash EEPROM Flash EEPROM is Electrically Erasable Programmable Read Only Memory used to store instructions and data constants which the microprocessor can access and interpret This set of instructions and data constants is called the firmware o
47. bserved when following the procedures and to exercise standard safety procedures They are indicated by Followed by a paragraph describing the concern NOTE Notes are placed before a procedure to inform the service personnel of specific details to improve quality to give reminders of interrelated parts and to provide other helpful information They are indicated by NOTE Followed by a paragraph describing the concern General Description 19 Croma24 Service Manual Printer Specifications The specifications and performance characteristics of the Croma24 Color Inkjet Printers are as follows 20 Max Printing Area Norm 23 8 60 9 Extend 24 6 62 9cm Accuracy 0 296 line length with ROLL mode off Language Emulation Interface ENCAD RTL Centronics parallel RS 422 serial Buffer GA and GA CAD 2 MB permanently versions only installed Environment not upgradable Operating 41 to 104 F Power Requirements 5 to 40 C Input Voltage 1096 to 7096 RH 90 246 VAC non condensing 47 63 Hz Output Power 24 W typical 63 W maximum Baud Rates 38400 1MByte High Speed Serial MAC only Resolution Mono 600x600 dpi addressable Color 300x300 dpi General Description Storage 40 to 140 F 40 to 60 C 596 to 8096 RH non condensing Dimensions Height 12 305mm Width 43 5 1105mm Depth 14 356mm Croma24 Service Manual Contents of this Service Manual Figures are used
48. connector J 1 on the Carrier PCB and remove the end of the Trailing Cable Figure 5 4 Strain Relief Removal Installation from Carrier 6 Removethe Trailing Cable and Strain Relief from the Carrier Assembly by releasing the latch on the left lower side of the Strain Relief and lifting it off of the Carrier Assembly See Figure 5 4 7 Movethe Carrier Assembly away from the left end of the Slide Shaft Compress the back of the Frame Tensioner and use the end of a screwdriver to remove the Carrier Belt from the Servo Motor pulley See Figure 5 2 8 Remove the Compression Spring from the Frame Tensioner and set it aside 96 Assembly Disassembly 10 11 12 13 Croma24 Service Manual Push the Carrier Belt through the Frame Tensioner enough to remove the Idler Pulley Assembly from the Frame Tensioner and then set aside the Idler Pulley Assembly and the Frame Tensioner See Figure 5 6 for part identification if necessary Slide the Carrier Assembly and Drive Belt off the left side of the Slide Shaft LARRIER BELT RICSHT PAST BELT CLAMP LEFT POST CF BELT Figure 5 5 Carrier Belt Clamp Once the Carrier Assembly is removed from the Slide Shaft turn it over so that you can see the Belt Clamp See Figure 5 5 To disengage the Carrier Belt from the Belt Clamp push the Carrier Belt away from the left post of the Belt Clamp and gently lift up until the bottom edge of the Carrier Belt
49. ding strap for the Stepper Motor 90 Assembly Disassembly Croma24 Service Manual 11 Using care remove the MPCB by bringing it out the front of the printer Failure to use an approved anti static bag for storage or shipment may cause damage to the and af fect the Warranty 12 Place the MPCB in an ESD bag anti static bag in preparation for shipment to ENCAD for replacement or repair or if it is to be stored at your facility for repair Install the MPCB and Actuator Assembly Integrated circuits may become weakened or damaged by electrical discharge Do not touch or work near in tegrated circuits without wearing an ESD wrist strap 1 Put onan ESD wrist strap 2 Remove the from the ESD bag KIGINASSV 3 Insert the MPCB through the area in the front of the printer Align the MPCB so that the serial and parallel connections protrude out of the back of the printer and that the screw holes are aligned to the holes on the Base of the printer o o w lt 4 Using a 2 Phillips Torque Screwdriver fasten the Actuator Assy to the MPCB and the Base with 15 in Ib of torque 5 Attach the grounding strap for the Stepper Motor Assembly Disassembly 91 Croma24 Service Manual 6 Connect the Servo Motor connector to J 4 on the MPCB 7 Connect the Power Supply connector to J 5 on the MPCB 8 Connect the Stepper Motor connector to J 7 on the MPCB 9 Connect the Fan connector to
50. e connectors on the MPCB and carrier board respectively To remove the ribbon cables from their connectors lift the connector s ribbon locking mechanism as shown in Figure 3 6 reattach depress the locking mechanism back into the locking position after inserting the ribbon cable end gt z O m LOCKING MECHANISM UNLOCKED LOCKED CONNECTOR ASSEMBLY Figure 3 6 Ribbon Connector Locking Mechanism Maintenance 51 Croma24 Service Manual Replace Carrier Bushings The carrier bushings are rated for approximately 1500 hours of operational usage Given an average of about 3 hours a day of printing for 104 weeks results in 1560 hours Therefore it is safe to approximate 1500 hours into 2 years of continuous service If not replaced the wear on the bushings can result in erratic carrier motion and or carrier axis failures It can even cause cartridge headheight to become uneven To replace the carrier bushings follow the Replacing the Carrier Bushing procedures in Chapter 5 Servo Motor Winding Resistance Check Figure 3 7 Servo Motor 1 Disconnect the servo motor connection from the MPCB 2 Using a standard ohmmeter or multimeter connect the meter leads to the two wires going to the motor 3 While manually rotating the servo motor monitor the readings on the meter The acceptable range is 10 20 ohms Typically the reading is 12 16 ohms 5 Ifthe measurement is found to be unsati
51. e the carrier assembly from side to side m 2 gt 2 9 m 6 Wipethe shaft again to remove any deposits left from the carrier 7 Lower the cover and reconnect the power cord perform the PRIME plot Be sure that the carrier moves freely over the slide shaft Service Station Cleaning Ink and dust may build up on the service station resulting in contamination which may smear the prints The service station is deaned as follows 1 Disconnect the power cord and interface cable 2 Raisethe middle cover 3 Carefully move the carrier toward the center of the printer Maintenance 45 Croma24 Service Manual 4 Using a cotton swab dampened with distilled water wipe the seals and the rubber wiper in the service station until no more ink residue or dust can be removed 5 With dry swab wipe all moisture from the seals and Wi pers 6 Close the cover and reconnect the power cord and interface cable Linear Encoder Strip Cleaning Clean the linear encoder strip monthly or as necessary to remove any buildup of debris Distilled water or isopropyl alcohol may be used You may notice that it tends to fog the encoder strip however no detrimental effect has been observed in the field To clean the Encoder Strip 1 Disconnect the power cord and interface cable 2 Slightly dampen a cotton swab with distilled water or isopropyl alcohol and wipe along the length of the encoder strip on both sides
52. eal in remove the retaining ring from the other side This releases the Seal Post with the Seal attached and the Seal spring d Remove the Seal from the Seal Post by sliding the rubber Seal until it is released Install the Service Station Seals and Wipers 1 To install a Service Station Seal a Slide the new Seal over the Seal Post b Insert the Seal Post through the Seal spring c Align the Seal Post and spring into the hole on the Service Station Sled it is keyed to only goin one way d Press the Seal Post in to give enough clearance on the other side to attach the retaining ring e Insert the Service Station Sled into the Service Station Base by sliding the Service Station Sled down and to the left into the Base To seat the Sled completely into the Base it will be necessary to press down on the tab on the Actuator NKIGINASSV g o o lt f Reattach the spring onto the post on the bottom of the Service Station Sled 2 To install a Service Station Wiper press the new Wiper onto the wiper support Assembly Disassembly 111 Croma24 Service Manual 6 Position the Service Station inside the Right Cover and place the left side of the Service Station into the Platen Push down on the right side of the Service Station until the Service Station snaps into place Slide the Carrier Assembly to the right and back into the home position Lower the Middle Cover Remove the Lowe
53. er belt is loose too tight worn or damaged carrier bushings worn or damaged MPCB has 24 VDC atJ pins 1 2 power not being applied to fan 1 perform Flex Cable Contact Cleaning 2 replace carrier assembly reinstall check tension assembly and or replace belt replace bushings 1 reseat connection at MPCB tofan 2 replace fan replace MPCB Troubleshooting 85 o I jo 2 Croma24 Service Manual This Page Intentionally Left Blank 86 Troubleshooting Assembly Disassembly 5 Introduction Chapter 5 contains the procedures for removal and replacement of the Croma24 printer assemblies and mechanisms Illustrations are provided for clarity Steps for each replaceable part may depend on parts already removed in previous disassembly directions It is recommended that you read through each procedure before begin ning the removal and replacement of any assemblies or mecha nisms The following is a list of tools which are recommended to disassemble and reassemble the printer 1 Phillips Torque Screwdriver 2 Phillips Torque Screwdriver 1 Slotted Torque Screwdriver 2 Slotted Torque Screwdriver 1 Phillips Screwdriver 2 Phillips Screwdriver 1 Slotted Screwdriver 2 Slotted Screwdriver Torque Screwdriver Allen Hex Driver 4mm Torque Screwdriver Socket Head 4mm Wire Cutters Needle Nose Pliers X ACTO Knife ESD Wrist Strap The following materi
54. f the plotter Theterm Flash means that bytes cannot be individually erased A block or the whole device is erased at the same time and the block or whole device is then reprogrammed It can be erased and reprogrammed more than 10 000 times Theory of Operation 31 Croma24 Service Manual 32 The system firmware is stored in Flash EEPROM and can be up graded by opening the Control Panel located on the host computer Once the Control Panel has been executed it first starts an initial ization and status communication sequence with the printer The Control Panel requires ink levels and deadband information to load correctly At the same time it checks the version of firmware that is loaded on the printer Theflash EEPROM is a volitile memory in that it will lose updated information after a loss of power and revert back tothe firmware that was initially installed at the factory If the Control Panel contains a newer version of the firmware than the printer is cur rently loaded with it automatically updates the firmware at the startup of the Control Panel DRAM DRAM is Dynamic Random Access Memory which provides tempo rary storage of the microprocessor calculation and input output data It is also a faster type of memory then the Flash EEPROM Thats why the printer control program is also copied from the Flash EEPROM to RAM where it can be executed faster The printer is supplied with 2 Megabytes of DRAM permanently installed on
55. g Procedures Always turn the printer OFF remove the power cord and the interface cable before cleaning the printer An electrical shock hazard may be present if these proce dures are not followed External Cleaning Do not use abrasive cleansers of any sort on the sur faces of the printer Damage to the surface may result The exterior surfaces of the printer may be cleaned with a soft cloth which has been dampened For more persistent stains a small amount of liquid detergent may be used Cleaning intervals are determined by the environment in which the printer is used Slide Shaft Cleaning Use only isopropyl alcohol on the slide shaft of the printer Damage to the stainless steel slide shaft may result if cleaned with water and not completely dried off 44 Maintenance Croma24 Service Manual Printer problems can be caused by an accumulation of dirt or other contamination on the slide shaft This contamination may lead to drag on the carrier Extreme drag results in a carrier axis failure fault and will stop the carrier motion These problems may be eliminated by maintaining and cleaning the slide shaft at intervals determined by the environmental conditions Do not use any lubrication To clean the slide shaft 1 Remove the power cord 2 Raise the middle cover 3 Moisten a clean cloth or paper wipe with isopropyl alcohol 4 Wipe the length of the slide shaft with the moistened cloth or wipe 5 Manually mov
56. he full upward position 3 Remove the Middle Cover by pushing the Middle Cover backwards to disengage it from the Left Cover pin Push back on the right side to disengage it from the Right Cover pin 4 Remove the Right Cover by using a flat head screwdriver to unhook the locking clasps located in Figure 5 1 All clasps can be accessed from under the Base Carefully lift off the Cover Assembly Disassembly Croma24 Service Manual INSERT SCREW DRIVER Figure 5 1 Cover Removal installation 5 Remove the Left Cover by using a flat head screwdriver to unhook the locking clasps located in Figure 5 1 All clasps but one can be accessed from under the Base The clasp located near the AC input plug can be reached with a 1 flathead screwdriver inserted into the slot between the Base and the Cover above and to the left of the AC plug on the back of the printer See insert on Figure 5 1 Carefully lift off the Cover Install the Left Middle and Right Covers 1 Align the locking mechanisms on the Left Cover with the holes in the Base Carefully push the Cover down onto the Base until it locks into place NKIGINASSV g o gt o lt 2 Align the locking mechanisms on the Right Cover with the holes in the Base Carefully push the Cover down onto the Base until it locks into place 3 Reinsert the Middle Cover by pressing it back onto the left and right pins Lower the Middle Cover into the ready posit
57. he speed of the Carrier Assembly is controlled by varying the duty cycle of the power applied to the controller The microprocessor checks the position of the Carrier Assembly approximately 1 000 times per second during the servo interrupt It then updates the PWM pulse width modula Theory of Operation Croma24 Service Manual tor register in the gate array which sets the duty cycle to make adjustments to the Carrier Assembly speed A linear optical encoder is used to monitor the Carrier Assembly position The optical encoder strip runs the length of the Stabilizer Bracket and contains 150 lines and spaces per inch Thus there are 300 edges per inch The detector circuit actually consists of two optical edge detectors They are separated from each other by one half the width of one of the optical lines on the encoder strip This allows 4 evenly spaced pulses to be developed for each line on the encoder strip This is known as quadrature signals It gives an effective resolution of 600 lines per inch SeeFigure 2 8 for a graphical representation of quadrature signals PA 23 E 29 DETECTOR 2 e DETECTOR 1 ENCODER STRIP OUTPUT OF DETECTOR 1 OUTPUT OF DETECTOR 2 COMPOSITE TRANSITION TRIGGERED OUTPUT GF BOTH DETECTORS 4 OUTPUT PULSES PER OPTICAL LINE Figure 2 8 Quadrature Signal Genera
58. horized ENCAD distributors or dealers The intent of this Warranty is to repair or replace defective Products subjected to normal wear and tear when operated according to ENCAD instructions This Warranty does not cover damage to the Product resulting from the following Accident or negligence Unauthorized modification of the Product Adverse environmental conditions Service of the Product by other than an ENCAD authorized service provider Unauthorized or improper use including but not limited to Use in applications for which the Product was not designed Using cartridges or ink other than those supplied by ENCAD or authorized ENCAD resellers Using media other than that supplied by ENCAD or authorized ENCAD resellers Lubricating any part of the printer Internationally Contact your dealer or distributor for warranty information Croma24 Service Manual Table of Contents Chapter 1 General Description eere 17 eror eie 17 ie 18 Related Publications 18 Electrostatic Discharge ESD Sensitivity 18 Warnings Cautions and 19 Printer Specifications m 20 Contents of this Service 22 21 Technical SUPPOM ete ER alana EE
59. in this manual to clarify procedures They are for illustrative purposes only and may not necessarily be drawn to scale WHANAD m D U m z Material in this manual may be repeated in various sections so that each section can stand alone This allows information to be located without having to refer back and forth between sections Figures and tables are easily located and cross referenced and are listed in the front of the manual under List of Illustrations and List of Tables This manual is divided into six chapters as Chapter 1 GENERAL DESCRIPTION Contains a general description of the ENCAD 24 printer This includes printer specifications and related materials Also included is a description of the use of Warnings Cautions and Notes as used in this manual and chapter contents Chapter 2 THEORY OF OPERATION Functional descriptions of the overall printer and major assemblies are contained in this chapter Chapter 3 MAINTENANCE This chapter covers the scheduled maintenance cleaning procedures and alignment adjustments recommended to perform on the printers Diagnostics and a signal flow diagram also listed General Description 21 Croma24 Service Manual 22 Chapter 4 TROUBLESHOOTING A table containing problems that could occur and possible causes and repairs is found in this chapter This tableis not intended to bea complete listing of troubleshooting procedures It wi
60. ion 4 Reinstall the Cover Retaining Clips 2 into the square openings in the Lid Assembly Disassembly 89 Croma24 Service Manual Remove the MPCB Main Printed Circuit Board and Actuator Assembly Integrated circuits may become weakened or damaged by electrical discharge Do not touch or work near in tegrated circuits without wearing an ESD wrist strap 1 Perform steps 1 through 4 of the Left Middle and Right Cover Removal procedures to remove the Middle and Right covers 2 Remove the three screws and washers securing the Actuator Assy and the MPCB 3 Lift out the Actuator Assy 4 Put ESD wrist strap 5 Disconnect the Trailing Cable connector at the J 6 location Use the thumb and forefinger to pull up on the connector lock and remove the trailing cable from the connector 6 Disconnect the Fan connector red and black wires at the J 3 location Grasp the Fan connector with the thumb and forefinger and pull straight out 7 Disconnect the Stepper Motor connector at the J 7 location Grasp the Stepper Motor connector with the thumb and forefinger and pull straight out 8 Disconnect the Power Supply connector at the J 5 location Grasp the Power Supply connector with the thumb and forefinger and pull straight out 9 Disconnect the Servo Motor connector red and blue wires at the J 4 location Grasp the Servo Motor connector with the thumb and forefinger and pull straight out 10 Remove the groun
61. lied the the lower rollers Attach the Slide Shaft to the supports tightening to 15 in Ibs of torque using 3mm hex head torque screwdriver Attach the ground strap to the left side of the Slide Shaft Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Reinstallation procedures to reinstall the Carrier Assembly Assembly Disassembly 121 g o gt o lt 1419 3557 Croma24 Service Manual This Page Intentionally Left Blank 122 Assembly Disassembly Parts List 6 This chapter lists the items and their associated numbers for the parts and assemblies of the Croma24 printers that are field re placeable The list is in order of part name as identified in the assembly disassembly chapter This list is to be used in conjunction with the assembly disassembl y procedures to aquire the necessary parts and properly install them into the printer The parts and asssemblies may be ordered through your local autho rized dealer ENCAD Inc s Technical Support and Service department Table 6 1 Parts List FIGURE ITEM PART NAME PART 6 1 1 207027 6 1 2 COVER LEFT 207028 6 1 3 COVER RIGHT 207029 6 1 4 TRAILING CABLE COVER ASSY 208405 6 1 5 TRAILING CABLE ASSEMBLY 207068 6 1 D 203037 6 1 7 SPRING COMPRESSION 203999 6 1 8 IDLER ASSY scere 207185 6 1 9 FRAME 51
62. ligning the bracket guides with the base guide tracks See Figure 5 16 4 Slide the Lower Roller Assembly to the right until the left lower roller bracket is snug against the bracket stop guide 5 Route the Stepper Motor wires through the wire access area and to the wire clamp Attach the connector to J 7 on the MPCB 116 Assembly Disassembly Croma24 Service Manual 6 Route the Stepper Motor ground strap through the wire access area and to the wire clamp Attach onto the back of the MPCB 7 Carefully snap the Platen onto the printer Base Ensure that the ground straps for the Slide Shaft and C Bracket are coming through the holes in the Platen 8 Secure the Lower Roller Assembly onto the Platen 9 Attach the C Bracket Assembly and ground strap to the Platen by aligning the bracket onto the bracket guide pins and securing with attaching hardware to 15 in Ib of torque See insert of Figure 5 14 for connection of ground strap onto the C Bracket Ensure that the Pinch Rollers are centered on the lower rollers and that tension is being applied the the lower rollers 10 Attach the Slide Shaft to the supports tightening to 15 in Ibs of torque using 3mm hex head torque screwdriver 11 Attach the ground strap to the left side of the Slide Shaft 12 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Reinstallation procedures to reinstall the Carrier Assembly Remove the Power Supply and AC Entry Module 1 Re
63. lizer bracket until a reading of 0 075 47 0 003 is observed Read only the RED numbers on the micrometer gauge The measurement of 0 075 47 0 003 is used because the test cartridge being used does not have print head attached 0 010 difference had to be added to compensate for the lack of a print head 9 Tighten the screw on the center of the stabilizer Maintenance 63 Croma24 Service Manual 64 10 11 12 13 14 15 16 While lifting up the measuring tip of the micrometer slide the Carrier to the left of the stabilizer as shown in Figure 3 20 Position it as close to the screw as possible and drop the measuring tip onto the platen Do this a couple of times to ensure an accurate reading Move the left end of the stabilizer bracket until a reading of 0 075 0 003 is observed Read only the RED numbers on the micrometer gauge Tighten the screw on the left end of the stabilizer While lifting up the measuring tip of the micrometer slide the Carrier to the right of the stabilizer as shown in Figure 3 20 Position it as close to the screw as possible and drop the measuring tip onto the platen Do this a couple of times to ensure an accurate reading Move the right end of the stabilizer bracket until a reading of 0 075 0 003 is observed Read only the RED numbers on the micrometer gauge Tighten the screw on the right end of the stabilizer Repeat these steps as many times
64. ll isolate the problem down tothe lowest replacable assembly If the problem happens to bethe wiring between assemblies standard troubleshooting techniques will have to be implemented to correct the problem Chapter 5 ASSEMBLY DISASSEMBLY Contains detailed procedures to remove and replace printer parts and assemblies Chapter 6 PARTS LIST Contains a complete listing of all field replacable parts and assemblies for the Croma24 Color Inkjet Printer Illustrated parts breakdown drawings included to help clarify and identify parts for ordering Special kits and adjustment jigs may be required ORIENTATION Instructions in this manual are based on the assumption that the service person is facing the front of the printer References to top view back view and so forth are consis tent with this engineering standard References to the X Axis and Y Axis Paper Axis and Carrier Axis respectively follow the stan dard of AutoCAD absolute coordinates up and down for X left to right for Y General Description Croma24 Service Manual Technical Support ENCAD offers full technical support and service for its various products If you are unable to find the answer to your question in either the User s Guide Service Manual or other related publica tions check out ENCAD s Technical Bulletins located on ENCAD s bulletin board or the Internet ED D U m z ENCAD BBS 619 452 2653 or 619
65. move the Left Middle and Right covers by following the cover removal procedures 2 Remove the Cutter Actuator by reaching under the Platen and releasing the actuator tabs 3 Release the Carrier Belt from the servo Motor spindle by pressing the tension assembly inward to allow enough slack to lift off the belt from the servo motor NKIGINASSV g o o lt 4 Disengage the Trailing Cable from the Carrier Assembly by disconnecting the cable from J 1 on the Carrier Board and pressing on the Trailing Cable Strain Relief latch see Figure 5 4 5 Slide the Carrier Assembly Belt and Tension Assembly off the left side of the Slide Shaft Assembly Disassembly 117 Croma24 Service Manual 118 6 Disconnect the Trailing Cable from J 6 on the MPCB and remove the Trailing Cable Cover Assembly 7 Disconnect the Servo Motor cable from J 4 on the MPCB and remove the Servo Motor 8 Remove the C Bracket Assembly 9 Using a 2 Phillips screwdriver remove the grounding strap on the left side of the Slide Shaft 10 Remove the Slide Shaft using a 3mm hex head driver 11 Disconnect the Lower Drive Shaft Assembly from the Platen by removing the 4 attaching screws 12 Remove the Platen by releasing the 4 securing tabs 2 on each side and six screws Gently lift the Platen off of the Base 13 Disconnect the Power Supply cable from J 5 the MPCB Remove the cable from the cable supports on the Base GROU
66. n the Slider and the Encoder on the Carrier PCB Guide the belt while sliding the Carrier Assembly from left to right on the Slide Shaft 6 Move the Carrier Assembly to the left end of the Slide Shaft and align the left bushing on the Carrier Assembly with the left end of the Slide Shaft 98 Assembly Disassembly Croma24 Service Manual 7 Insert the Strain Relief with Trailing Cable onto the Carrier Assembly by sliding it onto the Strain Relief Support until it snaps firmly into place See Figure 5 4 8 Place the Trailing Cable into the J 1 connector lock on the Carrier Make sure the silver fingers on the Trailing Cable are fully inserted into the lock and slide both sides of the connector lock shut at the same time 9 Place the right side of the back of the Electronics Cover under the Trailing Cable Support Assembly and gently press down on the ends of the Electronics Cover until the latches snap into the Carrier Assembly 10 Slide the Carrier Assembly to about the middle of the Slide Shaft and stretch out the Carrier Belt 11 Insert the Carrier Belt into the Frame Tensioner so that the belt extends about an inch past the Frame Tensioner COMPRESSION SPRING FITS OVER THIS POST COMPRESSION SPRING FRAME TENSIONER CARRIAGE BELT THIS NOTCH IN THE 7 THIS NOTCH IN FRAME TENSIONER THE END OF THE MUST FIT OvER NKIGINASSV g o gt o lt
67. nector at the J 6 location on the MPCB Use the thumb and forefinger to pull forward the connector lock and remove the Trailing Cable from the connector See Figure 3 6 if necessary Figure 5 10 Trailing Cable Assembly Removal Installation 106 Assembly Disassembly Croma24 Service Manual 8 Using a 72 Phillips screwdriver remove the three screws washers securing the Trailing Cable Cover Assembly to the C Bracket Assembly See Figure 5 10 9 With the Carrier Assembly in the far right position if still installed carefully slide the Trailing Cable Cover left until it clears the back of the Carrier Assembly Then lift the Trailing Cable Assembly out of the printer Install the Trailing Cable Cover Assembly 1 Ensure that the Carrier Assembly if installed is at the far right side of the Slide Shaft position the Trailing Cable Support Assembly in front of the C Bracket and offset to the left enough to clear the Carrier Assembly 2 Carefully slide the right side of the Trailing Cable Cover Assembly behind the Carrier Assembly until the screw holes on the Trailing Cable Cover Assembly lines up with the holes in the C Bracket Assembly 3 Fasten the Trailing Cable Cover Assembly onto the C Bracket Assembly with screws with 15 of torque 4 Insert the right side of the Trailing Cable through the hole provided in the Platen and Secure to the J 6 connector on the MPCB 5 f the Carrier Assembly is n
68. nob near the top and turning the dial until the needle is at the 0 position on the dial Tighten the knob See Figure 3 18 A cO f x ENSURE PRESSURE IS ZERO PLACED ON THE REAR GAUGE 7 OFTHE CARTRIDGE Figure 3 18 Zeroing the Micrometer Gauge Remove the Cyan ink cartridge Snap the test cartridge with the micrometer gauge into the position vacated by the Cyan ink cartridge See Figure 3 19 Ensure that the micrometer can be read from the BACK of the printer LOO __ Figure 3 19 Test Cartridge Installed 5 Removethetrailing cable assembly 6 Loosen the three screws located on the back of the C bracket that secures the stabilizer to the C bracket 62 Maintenance Croma24 Service Manual Damage may occur to the micrometer gauge if the Carrier is moved without lifting up on the measuring tip This action could also take the micrometer out of alignment and foul the results of the alignment 7 While lifting up the measuring tip of the micrometer slide the Carrier to the center of the stabilizer as shown in Figure 3 20 Position it as close to the screw as possible and drop the measuring tip onto the platen Do this a couple of times to ensure an accurate reading LEFT CENTER RIGHT POSITION POSITION POSITION m gt z 9 m Figure 3 20 Carrier Positions for Head Height Adjustment 8 Move the left and right ends of the stabi
69. ntenance 73 Croma24 Service Manual Service Menu Figure 3 33 Service Menu The Service Menu consists of ROM Information Firmware Information Center Figure 3 34 ROM Info The ROM Info screen displays the current firmware version and date and time of development This information helps the technician by providing a means of identifying the firmware loaded on the printer Additional information can be obtained by revealing the Service Special Information Menu as shown in Figure 3 35 To display the Service Special Information Menu at the Maintenance Menu simultaneously type S while holding down the Alt key and then type bali 74 Maintenance Croma24 Service Manual Service Options ROM Info Service Special Service Special Information x Plottime reported as 369 On time reported 22200 Max PWM Postiton reported as 0 Carriage Shut Down Position m z gt 2 9 m Figure 3 35 Service Special Information The Service Special Information Menu displays information about the printers plot and ON time in seconds as well as the Maximum PWM Position and Carriage Shut Down Position Built In Test BIT The Croma24 printer has a built in test mode which is used as an additional tool for the technician in troubleshooting The BIT mode is a way of checking the performance of the printer while removing any interferance o
70. ot installed perform steps 5 through 18 of the Reinstalling the Carrier Assembly Carrier Belt and the Frame Tensioner procedures 6 Push the Trailing Cable up through the opening in the Strain Relief NKIGINASSV g o gt o lt 7 Fold the Trailing Cable and press it down onto the tape 8 Slidethe fold in the Trailing Cable under the triangular portion of the Strain Relief 9 Slide the Ferrite Bracket onto the Strain Relief until the catch is securely in place on the Strain Relief Assembly Disassembly 107 Croma24 Service Manual 7 Insert the Strain Relief with Trailing Cable onto the Carrier Assembly by sliding it onto the Strain Relief Support until it snaps firmly into place See Figure 5 4 Replacing the Carrier Bushings 1 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Removal procedures to remove the Carrier Assembly from the Slide Shaft Figure 5 11 Carrier Bushing Removal 2 Usea flat tip screwdriver to push up on the latch which holds the Carrier Bushing in place See Figure 5 11 3 Pull the Carrier Bushing out of the Carrier Assembly 4 Repeat Steps 2 and 3 for the other Carrier Bushing 108 Assembly Disassembly Croma24 Service Manual TABS Figure 5 12 Carrier Bushing Installation 5 Orient the new Bushing as shown in Figure 5 12 so that the metal tab on top of the Bushing goes into the Carrier Assembly first 6 Push the
71. ows what the display will look like when printing either the fast or slow test if it is out of alignment A correctly aligned printer will appear as if there is only a series of vertical lines printed No differences will be apparent between the segments in each set of lines The SLOW DEADBAND calibration is a precision test that checks the firing time of the jets as related to the forward and reverse direction Allowable values for the Slow Deadband is 1 0 and 1 and from 0 to 164 in increments of one for the Fast Deadband The Single Line Test and All Line Test are variations of the Slow and Fast Tests except they print longer lines so that long time integra tion of the deadband calibration can be observed The Single Line Test prints only one line at a time while the All Line Test prints all lines at the same time Diagnostics Menu Diagnostics Color Test Servo Motor Test Keypad Test Paper Motor Test LED Test Paper Sensor Test Fan Test Carriage Vibration Test Figure 3 25 Diagnostics Menu Maintenance Croma24 Service Manual The Diagnostics Menu as seen in Figure 3 25 consists of eight tests Paper Sensor Test Fan Test Carrier Vibration Test Color Test Keypad Test LED Test Servo Motor Test Paper Motor Test Paper Sensor Test The Paper Sensor Test checks the operation of the optical paper sensor Once activated a pop up dialog box Figure 3 26 ap
72. pears E that displays the widthof the media loaded in inches centimeters gt and millimeters a Z gt Paper Sensor Reported Data 5 Ci US ARCH D 24 0 x 36 0 Actual Width 24 05 in Actual Width 61 07 cm Actual Width 510 74 mm Figure 3 26 Paper Sensor Reported Data Dialog Box Fan Test Figure 3 27 Fan Test Menu Panels TheFan Test toggles the fan on and off each time the control button is activated Maintenance 69 Croma24 Service Manual Carriage Vibration Test The Carriage Vibration Test prints 5 sets of 3 parallel lines to test the vibration characteristics of the carrier assembly Color Test Figure 3 28 Color Test The Color Test prints a 1 inch swath of each color total of 4 to test for banding The test is selectable in the amount of ink that is printed to 10 25 35 50 65 75 or 100 70 Maintenance Croma24 Service Manual Keypad Test Test Time Selection x Selecttest duration time from list below 30 Seconds Test Cancel Figure 3 29 Keypad Test The Keypad Test checks the keypads on the MPCB The keypads are the microswitches that are activated whenever one of the tabs on the actuator is depressed Each time a switch is activated and hold for a few seconds a LED or both LEDs becomes illuminated The indications to be observed is listed in Table 3 2 m 2 gt 2 9 m Table 3 2 Keypad Test Indications
73. plug into TB1 on the Power Supply board Attach the Power Supply cable to the TB2 connector on the Power Supply board Place the Power Supply cover over the assembly and slide into place over the loosened screws on the Power Supply base Ensure that the grounding strap is still attached to the screw on the Power Supply base Insert the Power Supply Assembly into the printers Base Orient the assembly so that the extensions on the back of the Power Supply base slip into the square holes in the Base of the printer and that the AC Entry Module extends through the back of the printer Apply pressure downward on the Power Supply Assembly until it snaps firmly into place Connect the ground lug to the grounding stud on the Base See Figure 5 17 Position the Power Supply cable into the cable supports inside the front part of the Base until it reaches the MPCB Connect the Power Supply cable to the J 5 connector on the MPCB Carefully secure the Platen onto the printer Base Ensure that the ground straps for the Slide Shaft and C Bracket are coming through the holes in the Platen 120 Assembly Disassembly 12 13 14 I5 16 Croma24 Service Manual Secure the Lower Roller Assembly onto the Platen Attach the C Bracket Assembly to the Platen by aligning the bracket onto the bracket guide pins and securing with attaching hardware Ensure that the Pinch Rollers are centered on the lower rollers and that tension is being app
74. ptical encoder strip 28 35 P paper skewing 83 pinch roller 57 power supply 38 117 printer does not print 82 R related publications 18 resistance check servo motor 52 stepper motor 53 resolution 20 28 35 131 Croma24 Service Manual 5 scheduled maintenance 43 service station 45 110 servo motor 92 signal flow 77 skewing 57 stepper motor 112 T technical specifications 20 technical support ENCAD BBS 23 ENCAD website 23 help desk FAX 23 telephone 23 tests carriage vibration 70 color 70 fan 69 keypad 77 LED 72 paper sensor 69 print quality 67 servo motor 72 troubleshooting 79 132 V version CAD only 17 GA amp CAD 17 GA Graphic Arts 17 W warnings 19
75. r Roller Assembly and Stepper Motor 6 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Removal procedures to remove the Carrier Assembly from the Slide Shaft Perform the Trailing Cable Cover Assembly Removal procedures to remove the Trailing Cable Support Assembly Disconnect the Servo Motor connector red and blue wires at the J 4 location on the Using a 2 Phillips screwdriver remove the back screw on the Servo Motor The screwdriver will be at a slight angle Be careful not to strip the head of the screw or to cause damage to the Encoder Strip While holding the Servo Motor remove the front screw on the Servo Motor Tilt the bottom of the Servo Motor towards the back of the Platen and carefully lower the motor through the opening and out of the back of the 112 Assembly Disassembly Croma24 Service Manual g o gt o lt KIGINASSV Figure 5 14 C Bracket Assembly and Platen Removal Assembly Disassembly 113 Croma24 Service Manual 10 11 12 13 14 15 16 Remove the C Bracket Assembly by removing the four attaching screws See Figure 5 14 Using a 2 Phillips screwdriver remove the grounding strap on the left side of the Slide Shaft Remove the Slide Shaft using a 3mm hex head driver Disconnect the Lower Drive Shaft Assembly from the Platen by removing the 4 attaching screws See Figure 5 14 Remove the Platen by releasing
76. r Sensor snaps into place d Turn the Carrier Assembly over and insert the Encoder flex cable into the connector at J 2 e Push both sides of the connector lock shut at the same time 3 Perform the Carrier Assembly Carrier Belt and the Frame Tensioner Reinstallation procedures to reinstall the Carrier Assembly Remove the Trailing Cable Cover Assembly 1 Perform the Left Middle and Right Cover Removal procedures to remove the Left Middle and Right Covers 2 If you have not already removed the Carrier Assembly from the Slide Shaft you will need to perform Steps 3 through 7 of the Removing the Carrier Assembly Carrier Belt and the Frame Tensioner procedures in order to remove the Electronics Cover and release the left end of the Trailing Cable from the Carrier PCB IN ESI EET g o gt o lt 3 Disconnect the Ferrite and Ferrite Bracket from the Strain Relief by turning the Strain Relief over and pushing down on the Ferrite Bracket s catch until it can pass under the Strain Relief Pull the Ferrite Bracket clear from the Strain Relief Assembly Disassembly 105 Croma24 Service Manual 4 Remove the Trailing Cable from the triangular portion of the Strain Relief 5 Lift up on the short end of the tape and unfold the bend in the Trailing Cable 6 Remove the Strain Relief by pushing the Trailing Cable down through the opening in the Strain Relief 7 Disconnect the Trailing Cable con
77. r assembly A very common problem is where ink has been spilled onto the carrier assembly All electrical circuits should be free of foreign material especially those with conductive properties Clean the carrier assembly by blowing the objects away or gently brush them aside with a soft brush if required careful not to let anything to fall into the printer as you clean or it could cause a new problem later Inspect the carrier assembly for any damage to the boards connec tions or any of the components on the assembly Maintenance 49 Croma24 Service Manual Reseat Connectors on MPCB and Carrier Board Integrated circuits may become weakened or damaged by electrical discharge Do not touch or work near in tegrated circuits without wearing an ESD wrist strap Ribbon connectors can be easily damaged if incorrectly handled Observe extreme caution when handling the ribbon connectors to avoid damage Many problems can be corrected simply by removing and reseating connections found in circuit assemblies This process helps to clean the contacts and can dissipate any static electrical charges that might have developed oC O E POWER i FAN Figure 3 4 MPCB Connection Locations 50 Maintenance Croma24 Service Manual ae oil Figure 3 5 Carrier PCB Connection Locations Figures 3 4 and 3 5 shows the locations of all th
78. r conditions that may be caused by the computer or network It is considered as a stand alone test To perform the BIT test a loopback cable is required and needs to be installed into the I O ports before powering up the printer If the printer is a GA or GA amp CAD version insert both the parallel and serial ends of the loopback cable before powering up Maintenance 75 Croma24 Service Manual To enter the BIT mode apply power to the printer while simulta neously depressing the soft on button Continue to hold onto the soft on button until the carrier assembly has traveled halfway across the length of the platen Release the soft on button The printer will go through its normal start up routine Once the start up routine is completed it will perform and print out a series of tests First thing it will dois prime the cartridges The prime is followed by a serial port test GA or GA amp CAD ver sions The loopback cable is required to pass this test Then it will print a fast deadband display and a color calibration display It will then test the parallel port test The loopback cable is required to pass this test After completing the parallel port test the BIT test begins again with a prime It will continue to perform the BIT test until the BIT mode is exited To exit the BIT mode turn the printer off and on again in the normal power up mode The deadband and color calibration displays are for visual
79. rd and Actuator Assembly 90 Install the MPCB and Actuator 91 Remove Servo Motor nnne nnne nnne sn nennen nnns 92 Instal Servo Motor TERT 94 Remove the Carrier Assembly Carrier Belt and the Frame Tensioner 95 Install the Carrier Assembly Carrier Belt and the Frame Tensioner 98 Remove the Carrier 7 100 Install the Garrier PCB 102 Remove the Paper Sensor or the Encoder Sensor 102 Install the Paper Sensor or the Encoder Sensor 104 Remove the Trailing Cable Cover Assembly sss 105 Install the Trailing Cable Cover Assembly sss 107 Replacing the Carrier 108 Remove the Service Station Seals and Wipers 110 Install the Service Station Seals and Wipers 111 11 Croma24 Service Manual Table of Contents cont Chapter 5 Assembly Disassembly cont Remove the Lower Roller Assembly and Stepper Motor 112 Install the Lower Roller Assembly and Stepper Motor 115 Remove the Power Supply and AC Entry Module
80. ridges which hold it in place Then pull it straight out See Figure 5 8 Install the Paper Sensor or the Encoder Sensor ALIGN SIDES OF PAPER SENSOR 1 BOARD 4 BETWEEN GROOVES AND PUSH STRAIGHT DOWN ROUTE FLEX THROUGH SLOT INSIDE THE CARRIER ASSEMBLY 1 PUSH DOWN CLIP PUSH ENCODER IM OVER CLIP ENCODER MUST SLIDE PAST THE RIDGES AND SNAP INTO PLACE Figure 5 9 Paper and Encoder Sensor Installation 1 To install the Paper Sensor a Turn the Carrier Assembly so that the bottom side of it is facing up b Route the flex on the Paper Sensor through the slot in the Carrier Assembly Make sure the flex cable goes all the way through and does not curl under the Carrier PCB C Grasp the Paper Sensor between thumb and index finger and guide the sides of the board into the grooves on each side of the opening See Figure 5 9 d Push the Paper Sensor board down into the Carrier Assembly until it snaps firmly into place 104 Assembly Disassembly Croma24 Service Manual e Turn the Carrier Assembly over and insert the Paper Sensor flex cable into the connector at J 3 f Push both sides of the connector lock shut at the same time 2 To install the Encoder Sensor a Turn the Carrier Assembly so that the bottom side of it is facing up b Push down on the plastic clip and slide the back of the Encoder Sensor over it c Push the Encoder Sensor in past the ridges until the Encode
81. s for Head Height Adjustment 63 Maintenance lleno ree RERE ek eie 66 Manufacturing 66 Deadband Options Menu waives E pri 67 Deadband Slow Fast 68 Diagnostics 68 Paper Sensor Reported Data Dialog 69 Fan Test Menu Panels nde eta ea 69 70 b erri 71 LED E aad ete ie sea 72 servo Motor Testi nien De E Go EU te nee 72 Paper Motor Test ioo dore eae 73 Seice H 74 ie ure 74 Service Special Information 75 Signal Wiring Diagram 78 Chapter 4 Troubleshooting Chapter 5 Assembly Disassembly 14 5 1 5 2 5 3 5 4 5 5 5 6 5 7 5 8 5 9 Cover Removal Installation 89 Frame Tensionet ecce er tenen nva ee ut ds cea o att oa cb ad 92 Electronics Cover Removal 95 Strain Relief Removal Installation from Carrier 96 Carrier Belt Clamp inei rente rient et ee eoe eer 97 Installation of Frame Tensioner 99 Carrier PCB Removal In
82. sfactory replace the servo motor 52 Maintenance Croma24 Service Manual Stepper Motor Winding Resistance Check YELLOW WIRE Figure 3 8 Stepper Motor m z gt 2 9 m 1 Disconnect the stepper motor connection from the MPCB 2 Using a standard ohmmeter multimeter measure between pins 1 yellow wire and 3 3 Thereading should indicate 7 2 8 0 ohms 4 Continue by measuring between pins 4 and 6 5 Reading should also indicate 7 2 8 0 ohms 6 If either measurement is out of tolerance replace the stepper motor Banding Hardware vs Software The technician must be able to identify whether the banding that is being observed is related to either a hardware or a software problem The two examples in Figure 3 9 represent classic types of hardware and software banding errors Maintenance 53 Croma24 Service Manual 54 HARDWARE SOFTWARE Figure 3 9 Examples of Banding Hardware banding is usually characterized by consistent banding strips as shown It signifies a slippage in the media s normal move ment that is possibly due to the stepper motor lower drive shaft assembly or the rollguides on the back of the printer All these possible faulty areas deal with a rotational movement that if faulty will generate a consistent banding pattern The MPCB and Carrier PCB can also cause this type of error to incur Software banding is characterized by inconsistent banding lines
83. stallation eee 101 Paper and Encoder Sensor 103 Paper and Encoder Sensor Installation 104 Croma24 Service Manual List of Illustrations cont Figure Page Chapter 5 Assembly Disassembly cont 5 10 Trailing Cable Assembly Removal Installation 106 5 11 Carrier Bushing 108 5 12 Carrier Bushing Installation 109 5 13 Service Station Exploded View 110 5 14 C Bracket Assembly Platen 113 5 15 Stepper Motor Removal Installation eene 114 5 16 Installing Lower Roller Assembly 4 0 2 00 116 5 17 Ground Stud with Ground Lugs Attached sss 118 5 18 Power Supply Assembly meninada cesse enne dace en ien oca 119 Chapter 6 Parts List 6 1 Croma24 Assembly Parts Platen and 125 6 2 Croma24 Assembly Parts Below Platen 126 6 3 Carrier Assembly Breakdown 127 6 4 C Bracket Assembly Breakdown sse 128 6 5 Lower Roller Assembly Breakdown sese 129 15 Croma24 Service Manual List of Tables Table Chapter 1 General Description Chapter 2 Theory
84. talled and used in accordance with the instructions may cause harmful interfer ence to radio communications User Instructions If the equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Changes or modifications not expressly approved by ENCAD Inc could void the user s authority to operate the equipment Croma24 Service Manual VDE Statement Hiermit wird bescheinigt da der CROMA24 in bereinstimmung mit den Bestimmungen der BMPT AmstbIVfg 234 1991 funkentst rt ist Der vorschriftsmaBige Betrieb mancher Ger te z B MeBsender kann allerdings gewissen Einschr nkungen unterliegen Beachten Sie deshalb die Hinweise in der Bedienungsanleitung Dem Zentralamt f r Zulassungen im Fernmeldewesen w rde dan Inverkehrbringen dieses Ger tes angezeigt und die Berechtigung zur berpr fung der Serie auf die Einhaltung der Bestimmungen eingeraumt ENCAD Inc U S A Croma24 Service Manual Material Safety Data Sheet CROMA24 QIS Quality Image Supplies ink is nonhaz
85. the 4 securing tabs 2 on each side and six screws Gently lift the Platen off of the Base Disconnect the Stepper Motor cable from J 7 on the Disconnect the Stepper Motor ground strap from the MPCB Raise the Lower Drive Shaft Assembly out of the Base SPRING TO POST ON BRACKET Figure 5 15 Stepper Motor Removal installation Remove the Stepper Motor Extension Spring from the Stepper Motor and the post on the Left Lower Drive Shaft Bracket See Figure 5 15 Remove the hardware securing the Stepper Motor to the Left Lower Drive Shaft Bracket and remove the Stepper Motor 114 Assembly Disassembly Croma24 Service Manual Install the Lower Roller Assembly and Stepper Motor NOTE Ensure that the stepper motor wires are exiting the motor casing in the down direction when completely installed The wires should be opposite from the holes that secure the bracket to the platen 1 Loosely attach the Stepper Motor to the Lower Roller bracket using Stepper Motor hardware as shown in Figure 5 15 2 Attach the Stepper Motor tension spring to the Stepper Motor and the Lower Roller Bracket Tighten the Stepper Motor hardware to 8 of torque 1419 3557 o o w lt Assembly Disassembly 115 Croma24 Service Manual BRACKET GUIDES Figure 5 16 Installing Lower Roller Assembly 3 Lower the Lower Roller Assembly into the Base of the printer by a
86. the C bracket as you loosen or tighten the screw See Figure 3 13 58 Maintenance 3i Croma24 Service Manual MAINTAIN DOWNWARD PRESSURE WHEN LOOSENING OR TIGHTENING MOUNTING SCREW C BRACKET y MOUNTING SCREW PINCH ROLLER ASSEMBLY 7 7 Figure 3 13 Upper Roller Mounting If you loosen one of the mounting screws and the roller moves in one direction and you need to move the roller in the opposite direction tighten the screw that was loosened toits maximum torque 1 bs 0 5 BEFORE loosening the other screw to move the roller in the opposite direction NEVER LOOSEN OR TIGHTEN BOTH MOUNTING SCREWS AT THE SAME TIME ON THE SAME UPPER ROLLER SUPPORT gt z 9 m Following all of the above information precisely will ensure that the Upper Roller Support springs are deflected and the lower tail of the springs will always be pressed against the C bracket s vertical wall without a gap as shown in Figure 3 13 m d GAP GAP Figure 3 14 Gap of Pinch Roller Maintenance 59 Croma24 Service Manual IF ROLLER MOVES IF ROLLER MOVES TO THE RIGHT TO THE LEFT AND TOUCHES AND TOUCHES TN NO GAP NO GAP THEN TIGHTEN THE THEN TIGHTEN THE LEFT MOUNTING SCREW RIGHT MOUNTING SCREW 1 2 TURN AT A TIME 1 2 TURN AT A TIME Figure 3 15 Upper Roller Adjustment Figure 3 15 shows how the motion rapid drifting to the right or to
87. the left of the roller determines which mounting screw should be tightened in order to eliminate the motion of the roller so that the roller stays in the center of the shaft and or there is a gap when the Lower Roller is rotated forward Head Height Alignment Procedure Perform this procedure only when the encoder strip stabilizer has been removed from the C Bracket or whenever the alignment is in question The head height alignment procedure is to ensure that a 0 065 0 003 difference exists between the cartridge jet plate and the Platen See Figure 3 16 60 Maintenance Croma24 Service Manual CARTRIDGE JET PLATE 3 PLATEN 0 065 V pw d Figure 3 16 Carrier Head Height Tolerance 1 Remove the lid and the right cover of the printer See Chapter 5 for procedures gt z 9 m 2 Obtain the 3 tools Micrometer Dial Gauge Test Cartridge and Measuring Tip Extender from the Height Gauge Kit Assemble the tools as shown in Figure 3 17 AL SPIN HEAD ON gt MICROMETER GAUGE _ MICROMETER TO FACE BACKWARDS GAUGE lt TIGHTEN SET SCREWS PT ud TEST CARTRIDGE MEASURING TIP EXTENDER ENSURE TIP EXTENDS BELOW CARTRIDGE ae 1 4 6mm Figure 3 17 Setting Up Tools from Height Gauge Kit Maintenance 61 Croma24 Service Manual 3 Place the test cartridge upright on a flat surface and zero the gauge by loosening the k
88. tion Theory of Operation 35 Croma24 Service Manual The direction that the Carrier Assembly is moving is known based upon the state of one detector s output and the direction of the transition of the other detector s output A hardware counter in the gate array increments as the Carrier Assembly moves left and decrements as the Carrier Assembly moves right The hardware counter is only eight bits wide so it cannot store a value large enough to represent an absolute Carrier Assembly position Instead it is read during the servo interrupt and its value compared with that from the previous interrupt This differenceis used to update the absolute position value in the software Interface Circuits Serial amp Parallel SERIAL CONNECTOR 36 a MICRO PARALLEL KC TRANSCEIVER PROCENOR CONNECTOR Figure 2 9 Interface Circuits Data from the host computer is received either through the Centronics parallel port or the serial port on the GA CAD or GA versions only The gate array provides the control signals for DMA transfers from the serial port to DRAM The serial port is designed primarily to interface to a Macintosh printer port It has an eight pin Mini DIN connector The data TXD RXD signals meet RS 422 electrical specifications and the control signal DTRCLK meets the RS 423 electrical specifications The control signal can be configured as a 1 MHz clock for high speed
89. vice Manual This brings up the Maintenance Menu as seen in Figure 3 21 E MEM E Figure 3 21 Maintenance Menu Figure 3 21 shows that the Maintenance Menu for the Croma24 is divided into 3 submenus Manufacturing Diagnostics Service Options Manufacturing Menu Figure 3 22 Manufacturing Menu 66 Maintenance Croma24 Service Manual The Manufacturing Submenu Figure 3 22 consists of two proce dures Print Quality Test Deadband The procedures are primarily used in the manufacturing process and is adjusted correctly before it leaves the plant They are also available to the field technician in case such adjustments are required to be performed again Print Quality Test The Print Quality Test prints an imbedded 24 RTL graphic that allows the technician to get a general idea how well the printer is operating The graphic depicts a series of triangles of different colors This test is primarily used to identify if banding is present Deadband m 2 gt 2 9 m Fest fend T Paion Siga Lra Tei C Padzrn Al Lines Tend Cancel Comet Vedas Hera inus Figure 3 23 Deadband Options Menu The Deadband calibration Figure 3 23 consists of four tests Slow Deadband Test Fast Deadband Test Single Line Test All Line Test Maintenance 67 Croma24 Service Manual 68 Figure 3 24 Deadband Slow Fast Display Figure 3 24 sh
90. y sealing cartridge jet area bad carrier assembly bad MPCB pinch rollers not aligned correctly Stepper motor gearing dirty or damaged 1 perform Cartridge Dimple Cleaning procedure 2 replace cartridge reseat cartridge replace cartridge 1 perform Service Station Cleaning procedures 2 replace seal on service station replace carrier assembly replace MPCB perform Pinch Roller Adjustment Procedure perform Clean and Inspect Stepper Motor Gears procedure Troubleshooting Croma24 Service Manual 83 o I jo 2 Croma24 Service Manual Table 4 1 Troubleshooting Table cont Symptoms Printer Output is Banding if banding is 1 inspect and or consistent replace stepper motor perform Stepper Motor Winding Resistance Check 2 inspect and or replace stepper motor gears and or lower roller assembly 3 replace MPCB check amount replace or refill of ink in cartridges cartridges cartridges need perform Prime to be primed color calibration perform Color required Calibration X axis perform X axis calibration Calibration required e cartridge dimple 1 perform area dirty or Cartridge Dimple damaged Cleaning procedure 2 replace cartridge 84 Troubleshooting Croma24 Service Manual Table 4 1 Troubleshooting Table cont Symptoms Fan Does Not Power Up flex cable contacts dirty or damaged carri

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