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ENCAD CROMA24 Service Manual

Color inkjet printer
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  • Page 1 ®...
  • Page 2 This Page Intentionally Left Blank...

  • Page 3: Service Manual

    ® Croma24™ COLOR INKJET PRINTER SERVICE MANUAL Part Number 208817...
  • Page 4 Copyright © 1995 and 1996 ENCAD 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,...

  • Page 5: User Instructions

    Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. 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...
  • Page 6 Croma24 Service Manual VDE Statement Hiermit wird bescheinigt, daß der CROMA24 in Übereinstimmung mit den Bestimmungen der BMPT-AmstbIVfg 234/1991 funkentstört ist. Der vorschriftsmäßige Betrieb mancher Geräte (z.B. Meßsender) kann allerdings gewissen Einschränkungen unterliegen. Beachten Sie deshalb die Hinweise in der Bedienungsanleitung.

  • Page 7: Material Safety Data Sheet

    Material Safety Data Sheet CROMA24 QIS (Quality Image Supplies) ink is nonhazardous, 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:...
  • Page 8 Croma24 Service Manual WARRANTY OR DAMAGE CLAIMS United States ® ENCAD , Inc., warrants its printers ("P 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.

  • Page 9: Table Of Contents

    Contents of this Service Manual ... 21 Technical Support ... 23 Chapter 2 Theory of Operation... 25 Introduction ...25 Croma24 Printer General Block Diagram ... 25 Paper (Media) Axis Drive ... 27 The Carrier Axis Drive ... 28 Main Printed Circuit Board (MPCB) ... 29 Microprocessor ...
  • Page 10 Deadband Alignment ... 56 X-Axis Calibration ... 57 Pinch Roller Adjustment Procedure ... 57 Head Height Alignment Procedure ... 60 Croma24 Control Panel ... 65 Manufacturing Menu ... 66 Print Quality Test ... 67 Deadband ... 67 Diagnostics Menu ... 68 Paper Sensor Test ...
  • Page 11 Remove the Trailing Cable Cover Assembly ... 105 Install the Trailing Cable Cover Assembly ... 107 Replacing the Carrier Bushings ... 108 Remove the Service Station, Seals, and Wipers ... 110 Install the Service Station, Seals, and Wipers ... 111 Croma24 Service Manual...
  • Page 12 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 ... 117 Install the Power Supply and AC Entry Module ...
  • Page 13 2-8. Quadrature Signal Generation ... 35 2-9. Interface Circuits ... 36 2-10. Carrier Assembly Circuits ... 37 2-11. Croma24 System Ground Network (Left Side) ... 39 2-12. Croma24 System Ground Network (Right Side) ... 40 2-13. Front Key Controls ... 40 Chapter 3 Maintenance 3-1.
  • Page 14 Croma24 Service Manual List of Illustrations (cont) Figure Chapter 3 Maintenance (cont) 3-17. Setting Up Tools from Height Gauge Kit ... 61 3-18. Zeroing the Micrometer Gauge ... 62 3-19. Test Cartridge Installed ... 62 3-20. Carrier Positions for Head Height Adjustment ... 63 3-21.
  • Page 15 5-17. Ground Stud with Ground Lugs Attached ... 118 5-18. Power Supply Assembly ... 119 Chapter 6 Parts List 6-1. Croma24 Assembly Parts (Platen and Above)... 125 6-2. Croma24 Assembly Parts (Below Platen) ... 126 6-3. Carrier Assembly Breakdown ... 127 6-4.

  • Page 16: List Of Tables

    Croma24 Service Manual List of Tables Table Chapter 1 General Description Chapter 2 Theory of Operation 2-1. Front Key Control LED Codes ... 41 Chapter 3 Maintenance 3-1. Pinch Roller Adjustments ... 58 3-2. Keypad Test Indications ... 71 Chapter 4 Troubleshooting 4-1.

  • Page 17: Chapter 1 General Description

    General Description Introduction This manual provides service information for the ENCAD, Inc. Croma24 Color Inkjet Printer. There are three versions to the Croma24 Color Inkjet Printer family: CAD version for: CAD market I/O: parallel includes: All versions will have an ADI Windows driver and print utility.

  • Page 18: Overview

    Related Publications The following publication contains additional information which may be useful in servicing the ENCAD, Inc. Croma24 Color Inkjet Printers: ENCAD, Inc. Croma24 User Guide, P/N 207103 Copies of this and other ENCAD, Inc. publications may be obtained by contacting your nearest authorized ENCAD, Inc.

  • Page 19: Warnings, Cautions, And Notes

    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.

  • Page 20: Printer Specifications

    Croma24 Service Manual Printer Specifications The specifications and performance characteristics of the Croma24 Color Inkjet Printers are as follows: Max Printing Area: Norm Extend Language Emulation: ENCAD RTL Buffer: 2 MB permanently installed (not upgradable) Power Requirements: Input Voltage: 90 - 246 VAC...

  • Page 21: Contents Of This Service Manual

    List of Tables. This manual is divided into six chapters as: Chapter 1 GENERAL DESCRIPTION - Contains a general description of the ENCAD Croma24 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.
  • Page 22 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 are included to help clarify and identify parts for ordering.

  • Page 23: Technical Support

    6059 Cornerstone Court West San Diego, CA 92121 Help Desk Telephone: Help Desk FAX: International Users contact your local ENCAD service provider. see details on your ENCAD registration card. Croma24 Service Manual (619) 452-2653 or (619) 452-3768 http://www.encad.com (619) 452-4350 (619) 546-0659...
  • Page 24 Croma24 Service Manual This Page Intentionally Left Blank General Description...

  • Page 25: Chapter 2 Theory Of Operation

    Theory of Operation 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.

  • Page 26: General Block Diagram

    Croma24 Service Manual Figure 2-1. General Block Diagram. Theory of Operation...

  • Page 27: Paper (Media) Axis Drive

    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.

  • Page 28: The Carrier Axis Drive

    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.

  • Page 29: Main Printed Circuit Board (Mpcb)

    Figure 2-4. Main Printed Circuit Board. The Main Printed Circuit Board (MPCB) consists of six functional areas: Microprocessor (CPU) Gate Array Memory Circuits Stepper Motor Controller Servo Motor Controller Interface Circuits: Serial & Parallel Croma24 Service Manual Theory of Operation...

  • Page 30: Microprocessor

    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.

  • Page 31: Memory Circuits

    The term “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. Croma24 Service Manual Theory of Operation...

  • Page 32: Serial Eeprom

    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.

  • Page 33: Stepper Motor Controller

    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.

  • Page 34: Servo Motor Controller

    Croma24 Service Manual 2. Motor current sense The voltage across a series current sense resistor is measured and level shifted so that it is centered around 5 V. 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.

  • Page 35: Quadrature Signal Generation

    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.

  • Page 36: Interface Circuits: Serial & Parallel

    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.

  • Page 37: Carrier Assembly Circuits

    The paper sensor circuitry senses for the presence of loaded media. It does this automatically during the start-up and load sequences. It Croma24 Service Manual Theory of Operation...

  • Page 38: Power Supply

    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);...

  • Page 39: Croma24 System Ground Network (Left Side)

    Croma24 Service Manual Figure 2-11. Croma24 System Ground Network (Left Side). Theory of Operation...

  • Page 40: Front Key Controls

    Croma24 Service Manual Figure 2-12. Croma24 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.
  • Page 41 Croma24 Service Manual Table 2-1. Front Key Control LED Codes. Theory of Operation...
  • Page 42 Croma24 Service Manual This Page Intentionally Left Blank Theory of Operation...

  • Page 43: Chapter 3 Maintenance

    Scheduled maintenance can be thought of as preventive mainte- nance since its purpose is to prolong the life of the printer. It is not intended to repair or isolate an existing problem, though it can sometimes be helpful in detecting a condition due to a weakened component that has not yet completely failed.

  • Page 44: Cleaning Procedures

    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.

  • Page 45: Service Station Cleaning

    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.

  • Page 46: Linear Encoder Strip Cleaning

    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 a dry swab, wipe all moisture from the seals and wipers.

  • Page 47: Cartridge Dimple Cleaning

    Clean the cartridge dimple area by gently dabbing the area with a lint free cloth or cotton swab saturated with isopropyl alcohol. Croma24 Service Manual Maintenance...

  • Page 48: Flex Cable Contact Cleaning

    Croma24 Service Manual 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.

  • Page 49: Clean And Inspect Mpcb

    Clean the carrier assembly by blowing the objects away or gently brush them aside with a soft brush if required. Be careful not to let anything to fall into the printer as you clean or it could cause a new problem later.

  • Page 50: Reseat Connectors On Mpcb And Carrier Board

    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.

  • Page 51: Carrier Pcb Connection Locations

    Croma24 Service Manual Figure 3-5. Carrier PCB Connection Locations. Figures 3-4 and 3-5 shows the locations of all the 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.

  • Page 52: Replace Carrier Bushings

    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.

  • Page 53: Stepper Motor Winding Resistance Check

    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. Croma24 Service Manual Figure 3-8. Stepper Motor. Maintenance...

  • Page 54: Examples Of Banding

    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 any RIP or network systems and connect the printer directly to the computer.

  • Page 55: Alignments/Adjustments

    Croma24 Service Manual Alignments/Adjustments The ENCAD Croma24 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.

  • Page 56: Deadband Alignment

    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.

  • Page 57: X-Axis Calibration

    1 in-lbs ± 0.5. 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. Croma24 Service Manual...
  • Page 58 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. 1. Turn mo unting screw coun terclockw ise (ccw ). 2. Turn mo unting screw clockw ise (cw ).

  • Page 59: Upper Roller Mounting

    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. Figure 3-14. Gap of Pinch Roller. Croma24 Service Manual Maintenance...

  • Page 60: Head Height Alignment Procedure

    Croma24 Service Manual Figure 3-15. Upper Roller Adjustment. Figure 3-15 shows how the motion (rapid drifting to the right or to 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.

  • Page 61: Carrier Head Height Tolerance

    Figure 3-16. Carrier Head Height Tolerance. 1. Remove the lid and the right cover of the printer. See Chapter 5 for procedures. 2. Obtain the 3 tools (Micrometer Dial Gauge, Test Cartridge, and Measuring Tip Extender) from the Height Gauge Kit.

  • Page 62: Zeroing The Micrometer Gauge

    Croma24 Service Manual 3. Place the test cartridge upright on a flat surface and ‘zero’ the gauge by loosening the knob near the top and turning the dial until the needle is at the ‘0’ position on the dial. Tighten the knob.

  • Page 63: Carrier Positions For Head Height Adjustment

    0.075 +/-0.003” is used because the test cartridge being used does not have a print head attached. A 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. Croma24 Service Manual Maintenance...
  • Page 64 Croma24 Service Manual 10. 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.

  • Page 65: Croma24 Control Panel

    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:...

  • Page 66: Manufacturing Menu

    Croma24 Service Manual This brings up the Maintenance Menu as seen in Figure 3-21. Figure 3-21 shows that the Maintenance Menu for the Croma24 is divided into 3 submenus: Manufacturing Diagnostics Service Options Manufacturing Menu Maintenance Figure 3-21. Maintenance Menu.

  • Page 67: Print Quality Test

    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.

  • Page 68: Diagnostics Menu

    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.

  • Page 69: Paper Sensor Test

    Figure 3-26. Paper Sensor Reported Data Dialog Box. Fan Test Figure 3-27. Fan Test Menu Panels. The Fan Test toggles the fan on and off each time the control button is activated. Croma24 Service Manual Maintenance...

  • Page 70: Carriage Vibration Test

    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 The Color Test prints a 1 inch swath of each color (total of 4) to test for banding.

  • Page 71: Keypad Test

    Croma24 Service Manual Keypad Test 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.

  • Page 72: Led Test

    1 hour. 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.

  • Page 73: Paper Motor Test

    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.

  • Page 74: Service Menu

    Croma24 Service Manual Service Menu The Service Menu consists of ROM Information. 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.

  • Page 75: Built In Test (Bit)

    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 or conditions that may be caused by the computer or network.

  • Page 76: Firmware/Software Upgrades

    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 in Chapter One.

  • Page 77: Internal Cabling And Signal Flow Diagram

    (the original version) if power is removed from the printer for any reason. To 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.

  • Page 78: Signal Wiring Diagram

    Croma24 Service Manual Figure 3-36. Signal Wiring Diagram. Maintenance...

  • Page 79: Chapter 4 Troubleshooting

    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.

  • Page 80: Media Does Not Move

    Croma24 Service Manual Symptoms No Power (cont) Media Does Not Move Troubleshooting Table 4-1. Troubleshooting Table (cont). Possible cause • all DC output voltages not present (see Figure 3-18 for voltages) • all DC voltages present at MPCB • perform Stepper...

  • Page 81: Carrier Axis Failure

    • damaged encoder strip • bad encoder sensor • worn carrier bushings • loose trailing cable connections Croma24 Service Manual Solution perform Slide Shaft Cleaning procedure replace servo motor bad bearings - replace servo motor remove obstruction perform Encoder...

  • Page 82: Does Not Print

    Croma24 Service Manual Symptoms Carrier Axis Failure (cont) Does Not Print Ink Cartridge Misfiring Troubleshooting Table 4-1. Troubleshooting Table (cont). Possible cause • cutter assembly malfunction • damaged carrier drive belt system • bad connection between computer and printer • firmware is corrupted •...

  • Page 83: Paper Skewing

    • bad carrier assembly • bad MPCB Paper Skewing • pinch rollers not aligned correctly • stepper motor gearing dirty or damaged Croma24 Service Manual Solution 1) perform Cartridge Dimple Cleaning procedure 2) replace cartridge reseat cartridge replace cartridge 1) perform Service...

  • Page 84: Printer Output Is Banding

    Croma24 Service Manual Symptoms Printer Output is Banding Troubleshooting Table 4-1. Troubleshooting Table (cont). Possible cause • if banding is consistent • check amount of ink in cartridges cartridges • cartridges need to be primed • color calibration required • X-axis...

  • Page 85: Fan Does Not Power Up

    Fan Does Not Power Up • MPCB has 24 VDC at J3 pins 1-2 • power not being applied to fan Croma24 Service Manual Solution 1) perform Flex Cable Contact Cleaning 2) replace carrier assembly reinstall, check...
  • Page 86 Croma24 Service Manual This Page Intentionally Left Blank Troubleshooting...

  • Page 87: Chapter 5 Assembly\Disassembly

    Assembly\Disassembly 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...

  • Page 88: Remove The Left, Middle (Lid), And Right Covers

    Croma24 Service Manual Always turn the printer OFF, remove the power cord and the interface cable before beginning any disasembly procedures. An electrical shock hazard may be present if these precautions are not followed. Remove the Left, Middle (Lid), and Right Covers...

  • Page 89: Install The Left, Middle, And Right Covers

    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.

  • Page 90: Remove The Mpcb (Main Printed Circuit Board) And Actuator Assembly

    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.

  • Page 91: Install The Mpcb And Actuator Assembly

    1. Put on an ESD wrist strap. 2. Remove the MPCB from the ESD bag. 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.

  • Page 92: Remove Servo Motor

    Croma24 Service Manual 6. Connect the Servo Motor connector to J4 on the MPCB. 7. Connect the Power Supply connector to J5 on the MPCB. 8. Connect the Stepper Motor connector to J7 on the MPCB. 9. Connect the Fan connector to J3 on the MPCB.
  • Page 93 11. While holding the Servo Motor, remove the front screw on the Servo Motor. 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 94: Install Servo Motor

    Croma24 Service Manual Install Servo Motor Integrated circuits may become weakened or damaged by electrical discharge. Do not touch or work near integrated circuits without wearing an ESD wrist strap. 1. Put on an ESD wrist strap. 2. Reinsert the Servo Motor under the Platen with the connector facing the FRONT side of the Platen.

  • Page 95: Remove The Carrier Assembly, Carrier Belt, And The Frame Tensioner

    Left, Middle and Right Covers. 2. Remove the Cutter Actuator by reaching under the Platen and releasing the actuator support tabs. 3. Move the Carrier Assembly to the far left side of the Slide Shaft. Croma24 Service Manual Assembly\Disassembly...

  • Page 96: Strain Relief Removal/Installation From Carrier

    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.

  • Page 97: Carrier Belt Clamp

    Carrier Belt clears the top of the left post. 13. 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 98: Install The Carrier Assembly, Carrier Belt, And The Frame Tensioner

    Croma24 Service Manual Failure to use an approved anti-static bag for storage or shipment may cause damage to the MPCB and 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.

  • Page 99: 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 100: Remove The Carrier Pcb

    Croma24 Service Manual 13. 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.

  • Page 101: Carrier Pcb Removal/Installation

    Carrier PCB. See Figure 5-7. 5. Slide the Carrier PCB to the right to remove the tab on the left end of the Carrier PCB from the slot in the Carrier Assembly. Croma24 Service Manual Assembly\Disassembly...

  • Page 102: Install The Carrier Pcb

    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 PCB 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.

  • Page 103: Paper And Encoder Sensor Removal

    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 Croma24 Service Manual Assembly\Disassembly...

  • Page 104: Install The Paper Sensor Or The Encoder Sensor

    Croma24 Service Manual the Encoder clear the ridges which hold it in place. Then pull it straight out. See Figure 5-8. Install the Paper Sensor or the Encoder Sensor Figure 5-9. Paper and Encoder Sensor Installation. 1. To install the Paper Sensor: a.

  • Page 105: Remove The Trailing Cable Cover Assembly

    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. Croma24 Service Manual Assembly\Disassembly...

  • Page 106: Trailing Cable Assembly Removal/Installation

    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.

  • Page 107: Install The Trailing Cable Cover Assembly

    8. Slide the 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 108: Replacing The Carrier Bushings

    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.

  • Page 109: Carrier Bushing Installation

    Bushing goes into the Carrier Assembly first. 6. Push the 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 110: Remove The Service Station, Seals, And Wipers

    Croma24 Service Manual Remove the Service Station, Seals, and Wipers 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.

  • Page 111: Install The Service Station, Seals, And Wipers

    Actuator. 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. Croma24 Service Manual Assembly\Disassembly...

  • Page 112: Remove The Lower Roller Assembly And Stepper Motor

    Croma24 Service Manual 3. Position the Service Station inside the Right Cover and place the left side of the Service Station into the Platen. 4. Push down on the right side of the Service Station until the Service Station snaps into place.

  • Page 113: C-Bracket Assembly And Platen Removal

    Croma24 Service Manual i n t Figure 5-14. C-Bracket Assembly and Platen Removal. Assembly\Disassembly...

  • Page 114: Stepper Motor Removal/Installation

    Croma24 Service Manual 7. Remove the C-Bracket Assembly by removing the four attaching screws. See Figure 5-14. 8. Using a #2 Phillips screwdriver, remove the grounding strap on the left side of the Slide Shaft. 9. Remove the Slide Shaft using a 3mm hex head driver.

  • Page 115: Install The Lower Roller Assembly And Stepper Motor

    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 in-lb of torque. Croma24 Service Manual NOTE Assembly\Disassembly...

  • Page 116: Installing Lower Roller Assembly

    Croma24 Service Manual Figure 5-16. Installing Lower Roller Assembly. 3. Lower the Lower Roller Assembly into the Base of the printer by aligning 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.

  • Page 117: Remove The Power Supply And Ac Entry Module

    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.

  • Page 118: Ground Stud With Ground Lugs Attached

    Croma24 Service Manual 6. Disconnect the Trailing Cable from J6 on the MPCB and remove the Trailing Cable Cover Assembly. 7. Disconnect the Servo Motor cable from J4 on the MPCB and remove the Servo Motor. 8. Remove the C-Bracket Assembly.

  • Page 119: Power Supply Assembly

    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. Croma24 Service Manual Assembly\Disassembly...

  • Page 120: Install The Power Supply And Ac Entry Module

    10. Connect the Power Supply cable to the J5 connector on the MPCB. 11. 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.
  • Page 121 3mm hex head torque screwdriver. 15. Attach the ground strap to the left side of the Slide Shaft. 16. Perform the Carrier Assembly, Carrier Belt, and the Frame Tensioner Reinstallation procedures to reinstall the Carrier Assembly. Croma24 Service Manual Assembly\Disassembly...
  • Page 122 Croma24 Service Manual This Page Intentionally Left Blank Assembly\Disassembly...

  • Page 123: Chapter 6 Parts List

    Parts List 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/disassembly procedures to aquire the necessary parts and properly install them into the printer.
  • Page 124 Croma24 Service Manual FIGURE ITEM Parts List PART NAME ACTUATOR, MPCB ... 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 FEET ...

  • Page 125: Croma24 Assembly Parts (Platen And Above)

    Croma24 Service Manual Figure 6-1. Croma24 Assembly Parts (Platen and Above). Parts List...

  • Page 126: Croma24 Assembly Parts (Below Platen)

    Croma24 Service Manual Figure 6-2. Croma24 Assembly Parts (Below Platen). Parts List...

  • Page 127: Carrier Assembly Breakdown

    Croma24 Service Manual Figure 6-3. Carrier Assembly Breakdown. Parts List...

  • Page 128: C-Bracket Assembly Breakdown

    Croma24 Service Manual Figure 6-4. C-Bracket Assembly Breakdown. Parts List...

  • Page 129: Lower Roller Assembly Breakdown

    Croma24 Service Manual Figure 6-5. Lower Roller Assembly Breakdown. Parts List...
  • Page 130 Croma24 Service Manual This Page Intentionally Left Blank Parts List...

  • Page 131: Index

    . . 28 , 35 paper skewing . . 83 pinch roller . . 57 power supply . . 38 , 117 printer does not print . . 82 related publications . . 18 resistance check servo motor . . 52 stepper motor .
  • Page 132 Croma24 Service Manual scheduled maintenance . . 43 service station . . 45 , 110 servo motor . . 92 signal flow . . 77 skewing . . 57 stepper motor . . 112 technical specifications . . 20 technical support ENCAD BBS .

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