Page 1: Service Manual
KM-1500 SERVICE MANUAL Published in Mar. ’04 842DC113 Revision 3...
Page 2 CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions. CAUTION Double-pole/neutral fusing.
Page 3: Safety Precautions
Safety precautions This booklet provides safety warnings and precautions for our service personnel to ensure the safety of their customers, their machines as well as themselves during maintenance activities. Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities.
Page 4 Safety warnings and precautions Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below: DANGER: High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol.
Page 5: Installation Precautions
1. Installation Precautions WARNING • Do not use a power supply with a voltage other than that specified. Avoid multiple connections to one outlet: they may cause fire or electric shock. When using an extension cable, always check that it is adequate for the rated current..................... •...
Page 6 2. Precautions for Maintenance WARNING • Always remove the power plug from the wall outlet before starting machine disassembly....• Always follow the procedures for maintenance described in the service manual and other related brochures............................• Under no circumstances attempt to bypass or disable safety features including safety mechanisms and protective circuits.
Page 7 • Do not pull on the AC power cord or connector wires on high-voltage components when removing them; always hold the plug itself....................... • Do not route the power cable where it may be stood on or trapped. If necessary, protect it with a cable cover or other appropriate item.
Page 8: Specifications
2DC-2 CONTENTS 1-1 Specifications 1-1-1 Specifications ............................1-1-1 1-1-2 Name of parts ............................1-1-2 (1) Copier ............................. 1-1-2 (2) Operation panel ..........................1-1-3 1-2 Handling Precautions 1-2-1 Drum ..............................1-2-1 1-2-2 Installation environment ........................1-2-1 1-3 Installation 1-3-1 Unpacking and installation ........................1-3-1 (1) Installation procedure ........................
Page 9: Table Of Contents
2DC-2 (8) The eraser lamp does not turn on....................1-5-21 (9) The exposure lamp does not turn on.................... 1-5-21 (10) The exposure lamp does not turn off.................... 1-5-21 (11) The heater lamp does not turn on....................1-5-21 (12) The heater lamp does not turn off.
Page 10 2DC-2 (6) Adjusting magnification of the scanner in the auxiliary scanning direction ........1-6-46 (7) Adjusting the scanner leading edge registration ................1-6-47 (8) Adjusting the scanner center line ....................1-6-48 (9) Adjusting the margins for scanning an original on the contact glass ..........1-6-49 (10) Adjusting the DP magnification .....................
Page 11 2DC-2 1-1-1 Specifications Type ..........Desktop Copying system ......Indirect electrostatic system " × 14" [legal]) Originals ......... Sheets of paper (Maximum original size: folio/8 Platen: Sheets of paper, books, 3-dimensional objects (Maximum original size: folio/ " × 14" [legal]) Original feed system ......
Page 12 2DC-2 1-1-2 Name of parts (1) Copier ‹ › ⁄ ¤ & Figure 1-1-1 Name of parts 1 Original holder # Paper guide 2 Contact glass $ Paper stopper 3 Original size indicator % Stopper extension lock 4 Operation panel ^ Face-down output tray 5 Front top cover &...
Page 13 2DC-2 (2) Operation panel ⁄ & Figure 1-1-2 1 Start key (Indicator) @ Thick Paper key (Indicator) 2 Reset/Power key # 2in1/4in1 key (Indicators) 3 Stop/Clear key $ Sort key (Indicator) 4 Copy quantity/magnification display % Program key (Indicator) 5 Copy exposure adjustment keys ^ Add toner indicator 6 Image mode selection key &...
Page 14: Installation Environment
2DC-2 1-2-1 Drum Note the following when handling or storing the drum. • When removing the process unit, never expose the drum surface to strong direct light. • Keep the drum at an ambient temperature between 10°C/50°F and 32.5°C/90.5°F and at a relative humidity not higher than 80% RH.
Page 15: Unpacking And Installation
1-3-1 Unpacking and installation (1) Installation procedure Start Unpack. Remove the tapes, pads and sheets. Remove the pin holding scanner unit. Install a toner container. Connect the power cord. Inisializing the copier. Load paper. Make test copies. Completion of the machine installation. 1-3-1...
Page 16 Unpack & & Figure 1-3-1 Unpacking 1 Copier ! Front spacer 2 Power cord @ Front pad 3 Toner container # Bottom spacer 4 Operation guide $ Corner support 5 Installation guide % Products cover 6 Cleaning cloth ^ Plastic bag 7 Outer case &...
Page 17 CAUTIONS • Be sure to hold both the front and rear sides of the copier when carrying it, as shown in the illustration. • Be sure not to pull the cassette out when holding the front of the copier. • Be sure that the original cover is closed whenever transporting the copier. •...
Page 18 Remove the tapes, pads and sheets. 1. Remove the sheet and the two tapes. Tapes Sheet Figure 1-3-3 2. Open the original cover. Original cover Figure 1-3-4 1-3-4...
Page 19 3. Remove the nine tapes, the three pads and the sheet. Tapes Tape Tapes Sheet Tapes Figure 1-3-5 4. Pull the cassette out of the copier. Cassette Figure 1-3-6 5. Remove the pad from inside the cassette. Figure 1-3-7 1-3-5...
Page 20 Remove the pin holding scanner unit. 1. Remove the yellow pin for scanner unit and the paper tag from the left side of the copier. Paper tag Figure 1-3-8 Install a toner container. 1. Open the front top cover and front cover. Front top cover Front cover Figure 1-3-9...
Page 21 3. Remove the process unit from the copier. CAUTIONS • Place the process unit on a clean, level surface. • Never expose the process unit to any sort of impact or shock. • The drum in the process unit is sensitive to light. Never expose the drum even to normal office lighting (500 lux) for more than five minutes.
Page 22 6. Shake the toner container horizontally back and forth five or six times so that the toner inside of it becomes evenly distributed. Toner container Figure 1-3-14 7. Remove the orange protective seal. Seal Figure 1-3-15 8. Set the toner container into the process unit. Toner container Process unit Figure 1-3-16...
Page 23 9. Hold the process unit stable and push in on the areas of the toner container marked “PUSH Toner container HERE” until the container clicks into place in the process unit. Figure 1-3-17 10. Push the lock lever back into its locked position. Lock lever Figure 1-3-18 11.
Page 24 12. Close the front cover. Front cover Figure 1-3-20 13. Close the front top cover. Front top cover Figure 1-3-21 1-3-10...
Page 25 2DC-2 Connect the power cord. 1. Connect the power cord. Power cord Figure 1-3-22 Initializing the copier. 1. Turn the power switch to the copier ON ( | ). Power switch Figure 1-3-23 First “900” will appear in the copy quantity/ magnification display on the copier's operation panel.
Page 26 Load paper. 1. Pull the cassette out of the copier. Cassette Figure 1-3-25 2. Adjust the paper stopper in the rear portion of the Paper stopper cassette to fit the size of the paper being loaded there by pressing in on the release buttons and sliding the paper stopper to the corresponding paper size.
Page 27 2DC-2 4) Press down on the stopper extension lock and slide the paper stopper towards the rear of the cassette to set the lock into place. Paper stopper The paper stopper is in position for Folio and Oficio II size paper. Stopper extension lock Figure 1-3-28...
Page 28 NOTES • DO NOT set more paper than indicated by the lines located on the paper width guides. Paper width guide • Be sure to load paper with the side to be copied onto facing down. Figure 1-3-31 5. Push the cassette securely all the way back into the copier until it stops.
Page 29 2DC-2 1-3-2 Installing the document processor (option) Procedure 1. Remove all of the components to the document processor from the box. CAUTION Be sure to hold both sides of the document processor when carrying it, as shown in the illustration. Be particularly careful NOT to touch the guide film or the thin white surface indicated by the A in the illustration.
Page 30 4. Attach the document processor to the copier. CAUTION Be sure that the connection cable does not get caught between the document processor and the copier when attaching the document processor to the copier. Connection cable Figure 1-3-36 5. Gently close the document processor. Document processor Figure 1-3-37...
Page 31 2DC-2 CAUTION Be sure to tighten the pins securely when connecting the cable. Pins Figure 1-3-39 7. Turn the power switch to the copier back ON ( | ). Warm up will begin. “1” will appear on the operation panel and the Start indicator will light when the copier is in a copy-ready state.
Page 32 1-3-3 Installing the expanding memory (option) The main board of the copier is equipped with one socket for memory expansion. Expansion memory is available in the form of DIMM (Dual In-line Memory Module). CAUTION Take precautions that no foreign substances such as metal chips or liquid get inside the copier during the installation process.
Page 33 1-4-1 Maintenance mode The copier is equipped with a maintenance function which can be used to maintain and service the machine. (1) Executing a maintenance item Start Press the stop/clear key, start key and the left copy exposure adjustment key in the order presented and hold them down.
Page 34 2DC-2 (2) Maintenance mode item list Item Initial Section Maintenance item contents setting* General U000 Outputting an own-status report — U001 Exiting the maintenance mode — U004 Checking the machine number — U005 Copying without paper — U019 Displaying the ROM version —...
Page 35 2DC-2 Item Initial Section Maintenance item contents setting* Fixing and U161 Setting the fixing control temperature cleaning • Primary stabilization fixing temperature • Secondary stabilization fixing temperature • Copying operation temperature 1 • Copying operation temperature 2 • Number of sheets for fixing control U162 Stabilizing fixing forcibly —...
Page 36 (3) Contents of maintenance mode items Maintenance Description item No. U000 Outputting an own-status report Description Outputs lists of the current settings of the maintenance items, and paper jam and service call occurrences. Purpose To check the current setting of the maintenance items, or paper jam or service call occurrences. Before initializing the backup RAM, output a list of the current settings of the maintenance items to reenter the settings after initialization or replacement.
Page 37 2DC-2 Maintenance Description item No. U005 Copying without paper Description Simulates the copy operation without paper feed. Purpose To check the overall operation of the machine. Method 1. Press the start key. A selection item appears. 2. Select the item to be operated using the copy exposure adjustment keys. Display Operation Only the copier operates.
Page 38 2DC-2 Maintenance Description item No. U020 Initializing all data Description Initializes all the backup RAM on the main board to return to the original settings. U004, however, is not initialized. Purpose Run as needed. Method 1. Press the start key. 2.
Page 39 2DC-2 Maintenance Description item No. U030 Checking motor operation Description Drives each motor. Purpose To check the operation of each motor. Method 1. Press the start key. A selection item appears. 2. Select the motor to be operated using the copy exposure adjustment keys. When selecting the feed motor, pull out the optional drawer in advance.
Page 40 Maintenance Description item No. U032 Checking clutch operation Description Turns each clutch on. Purpose To check the operation of each clutch. Method 1. Press the start key. A selection item appears. 2. Select the clutch to be operated using the copy exposure adjustment keys. 3.
Page 41 2DC-2 Maintenance Description item No. U063 Adjusting the shading position Description Changes the shading position. Purpose Used when white lines continue to appear longitudinally on the image after the shading plate is cleaned. This is due to flaws or stains inside the shading plate. To prevent this problem, the shading position should be changed so that shading is possible without being affected by the flaws or stains.
Page 42 Maintenance Description item No. U073 Checking scanner operation Description Simulates the scanner operation under arbitrary conditions. Purpose To check scanner operation. Method 1. Press the start key. 2. Select the item to be changed by lighting a copy exposure indicator using the copy exposure adjustment keys.
Page 43 Maintenance Description item No. U087 Turning the DP scanning position adjust mode on/off Description Turns on or off the DP scanning position adjust mode, in which the DP original scanning position is adjusted automatically by determining the presence or absence of dust on the slit glass. Also changes the reference data for identifying dust.
Page 44 Maintenance Description item No. U088 Setting the input filter (moiré reduction mode) Description Turns moiré reduction mode on and off by switching the input filter on and off. Purpose Used to prevent regular density unevenness (moiré) on halftone image areas of the copy image in text mode and text and photo mode.
Page 45 Maintenance Description item No. U091 Checking shading Description Performs scanning under the same conditions as before and after shading is performed, displaying the original scanning values at nine points of the contact glass. Purpose To check the change in original scanning values before and after shading. The results may be used to decide the causes for fixing unevenness (uneven density) of the gray area of an image: either due to optical (shading or CCD) or other problems.
Page 46 2DC-2 Maintenance Description item No. U091 When scanning is performed before shading, the scan value at the machine center should be slightly different from those at the machine front and rear. When scanning is performed after shading, there should be no difference between respective values. Any differences between the values at machine front and rear indicates that scanner problem causes the fixing unevenness.
Page 47 2DC-2 Maintenance Description item No. U093 Setting the exposure density gradient Description Changes the exposure density gradient in manual density mode, depending on respective image modes (text, text and photo, photo). Purpose To set how the image density is altered by a change of one step in the manual density adjustment. Also used to make copy image darker or lighter.
Page 48 2DC-2 Maintenance Description item No. U093 Test copy mode While this maintenance item is being performed, copying from an original can be made in test copy mode. Completion Press the stop/clear key while a selection item is displayed. The indication for selecting a maintenance item No. appears.
Page 49 Maintenance Description item No. U144 Setting toner loading operation Description Sets toner loading operation. Purpose To run when drum filming (background blur in paper edge section) occurs. Change the setting value to 3 when poor-quality paper is used and filming occurs frequently. Method Press the start key.
Page 50 2DC-2 Maintenance Description item No. U158 Checking/clearing the developing count Description Displays the developing count for checking, clearing or changing a figure. Purpose To check the developing count. Method 1. Press the start key. 2. Select the item by lighting a copy exposure indicator using the copy exposure adjustment keys. Copy exposure indicator Description Setting range Initial setting...
Page 51 Maintenance Description item No. U162 Stabilizing fixing forcibly Description Stops the stabilization fixing drive forcibly, regardless of fixing temperature. Purpose To forcibly stabilize the machine before the fixing section reaches stabilization temperature. Method 1. Press the start key. “on” appears. 2.
Page 52 Maintenance Description item No. U203 Operating DP separately Description Simulates the original conveying operation separately in the DP. Purpose To check the DP. Method 1. Press the start key. 2. Place an original in the DP if running this simulation with paper. 3.
Page 53 2DC-2 Maintenance Description item No. U244 Checking the DP switches Description Displays the status of the switches in the DP. Purpose To check if switches in the DP operate correctly. Method 1. Press the start key. "-S-" appears. 2. Manually turn on and off each switch to check the status. When the on-status of a switch is detected, the image mode LED corresponding to the operated switch lights.
Page 54 Maintenance Description item No. U254 Turning auto start function on/off Description Selects if the auto start function is turned on. Purpose Normally no change is necessary. If incorrect operation occurs, turn the function off: this may solve the problem. Method Press the start key.
Page 55 Maintenance Description item No. U258 Switching copy operation at toner empty detection Description Selects if continuous copying is enabled after toner empty is detected. Method Press the start key. The screen for selecting an item is displayed. The current setting is displayed. Setting 1.
Page 56 Maintenance Description item No. U265 Setting the destination specifications Description Sets whether or not to print the product name on the reports that users print. Purpose To be set according to user request. Method Press the start key. The current setting appears. Setting 1.
Page 57 2DC-2 Maintenance Description item No. U402 Adjusting margins of image printing Adjustment See page 1-6-43. U403 Adjusting margins for scanning an original on the contact glass Adjustment See page 1-6-49. U404 Adjusting margins for scanning an original from the DP Adjustment See page 1-6-54.
Page 58 Maintenance Description item No. U903 Checking/clearing the paper jam counts Description Displays or clears the jam counts by jam locations. Purpose To check the paper jam status. Also to clear the jam counts after replacing consumable parts. Method 1. Press the start key. 2.
Page 59 Maintenance Description item No. U905 Checking/clearing counts by the DP Description Displays or clears the counts of the DP. Purpose To check the use of the DP. Also to clear the counts after replacing consumable parts. Method 1. Press the start key. 2.
Page 60 2DC-2 Maintenance Description item No. U911 Checking/clearing copy counts by paper size Description Displays or clears the paper feed count value by paper size. Purpose To check the time to replace consumable parts. Also to clear the counts after replacing the consumable parts. Method 1.
Page 61 Maintenance Description item No. U911 Clearing copy counts by paper size 1. Select the paper size to clear the count. 2. Display “CLE” using the copy exposure adjustment keys. 3. Press the start key. The count is cleared. Clearing copy counts for all paper size 1.
Page 62 Maintenance Description item No. U991 Checking the scanner count Description Display the scanner count value. Purpose To check the scanner count value. Method 1. Press the start key. 2. Change the indication of the copy quantity display by lighting a copy exposure indicator using the copy exposure adjustment keys.
Page 63: Copier Management
2DC-2 1-4-2 Copier management In addition to a maintenance function for service, the copier is equipped with a management function which can be operated by users (mainly by the copier administrator). In this copier management mode, default settings can be changed.
Page 64 2DC-2 (2) Default settings Text original exposure adjustment User status report Adjusts the exposure to be used when text original is Outputs the details of the default settings. selected for the image mode. 1. Select “F01” and press the Recall%/Enter key. 1.
Page 65 2DC-2 Optional drawer paper size Layout (borderline) Sets the size of paper loaded in the optional drawer. Selects the type of borderline for layout copying. 1. Select “F13” and press the Recall%/Enter key. 1. Select “F18” and press the Recall%/Enter key. 2.
Page 66 2DC-2 Off mode time Paper feed shifting adjustment (bypass tray) Sets the amount of time without any operation being Adjusts displacement of the copy image. performed until the off mode automatically engages. 1. Select “F29” and press the Recall%/Enter key. 1.
Page 67: Paper Misfeed Detection
1-5-1 Paper misfeed detection (1) Paper misfeed indication When a paper misfeed occurs, the copier immediately stops copying and displays the jam location on the operation panel. Paper misfeed counts sorted by the detection condition can be checked in maintenance item U903. To remove paper jammed in the copier, open the face-up output tray, front top cover, front cover or pull the drawer out.
Page 68 (2) Paper misfeed detection conditions Registration Exit sensor sensor Figure 1-5-2 1-5-2...
Page 69 2DC-2 Section Jam code Description Conditions System No paper feed When the power switch is turned on, the machine detects activation of the registration sensor or the exit sensor. Cover open JAM A cover open state is detected during copying. Secondary paper feed When the machine waits for secondary paper feed, 30 s or timeout...
Page 70 2DC-2 (3) Paper misfeeds • Copier Problem Causes/check procedures Corrective measures A piece of paper torn from Check visually and remove it, if any. A paper jam in the copy paper is caught conveying, fixing or around registration sensor exit section is indi- or exit sensor.
Page 71 Problem Causes/check procedures Corrective measures Check if the MP feed roller Check visually and replace any deformed roller. A paper jam in the is deformed. paper feed section Defective registration sen- Run maintenance item U031 and turn registration sensor on and is indicated during sor.
Page 72 Problem Causes/check procedures Corrective measures Defective registration sen- Run maintenance item U031 and turn registration sensor on and A paper jam in the sor. off manually. Replace registration sensor if indication of the cor- exit section is indi- responding sensor is not light. cated during copy- Defective exit sensor.
Page 73 2DC-2 • DP Problem Causes/check procedures Corrective measures A piece of paper torn from Remove any found. An original jams an original is caught when the power around the DP timing switch is turned on. switch. Defective DP timing Run maintenance item U244 and turn DP timing switch on and switch.
Page 74 2DC-2 1-5-2 Self-diagnosis (1) Self-diagnostic function This unit is equipped with a self-diagnostic function. When a problem is detected, copying is disabled. "C" and a number between 0100 and 7990 altenates, indicating the nature of the problem. After removing the problem, the self-diagnostic function can be reset by turning interlock switch off and back on. (2) Self diagnostic codes Remarks Code...
Page 75 Remarks Code Contents Causes Check procedures/corrective measures C0610 Bitmap (DIMM) problem Defective main Replace the main board (KP-5060) and (A0610*) • There is a problem with the data or board (KP-5060). check for correct operation. address bus of the bitmap DRAM. DIMM installed Check if the DIMM is inserted into the incorrectly.
Page 76 Remarks Code Contents Causes Check procedures/corrective measures C3200 Exposure lamp problem Defective scanner Replace the scanner board (KP-5063) and (A3200*) • In indicator check before starting board (KP-5063). check for correct operation. copying, the average value in scan- Defective expo- Replace the exposure lamp or inverter ning of the shading plate with the sure lamp or in-...
Page 77 Remarks Code Contents Causes Check procedures/corrective measures C6000 Broken fixing heater wire Poor contact in Check the connection of connector CN4 on • In fixing warm-up, the time to reach the thermistor the power supply board (KP-5059) and the 50°C/122 °F exceeds 13.5 s, the time connector termi- continuity across the connector terminals.
Page 78 2DC-2 Remarks Code Contents Causes Check procedures/corrective measures C7800 Broken external temperature ther- Poor contact in Reinsert the connector. Also check for con- (A7800*) mistor the operation tinuity within the connector cable. If none, • The input voltage is 0.5 V or less. board connector remedy or replace the cable.
Page 79: Image Formation Problems
1-5-3 Image formation problems (1) No image appears (2) No image appears (3) Image is too light. (4) Background is visible. (entirely white). (entirely black). See page 1-5-14 See page 1-5-14 See page 1-5-15 See page 1-5-15 (8) One side of the copy (5) A white line appears (7) A black line appears (6) A black line appears...
Page 80 (1) No image appears Causes (entirely white). 1. No transfer charging. Causes Check procedures/corrective measures 1. No transfer charging. A. The connector terminals of the high voltage Reinsert the connector. Also check for continuity within the board make poor contact. connector cable.
Page 81 (3) Image is too Causes light. 1. Insufficient toner. 2. Deteriorated developer. 3. Dirty or deteriorated drum. Causes Check procedures/corrective measures 1. Insufficient toner. If the add toner indicator lights, replace the toner container. 2. Deteriorated developer. Replace the process unit. 3.
Page 82 (6) A black line appears Causes longitudinally. 1. Dirty contact glass. 2. Dirty or flawed drum. 3. Deformed or worn cleaning blade. 4. Dirty scanner mirror. Causes Check procedures/corrective measures 1. Dirty contact glass. Clean the contact glass. 2. Dirty or flawed drum. Replace the process unit.
Page 83 (9) Black dots appear Causes on the image. 1. Dirty or flawed drum. 2. Dirty contact glass. 3. Deformed or worn cleaning blade. Causes Check procedures/corrective measures 1. Dirty or flawed drum. Replace the process unit. 2. Dirty contact glass. Clean the contact glass.
Page 84 (12) Paper creases. Causes 1. Paper curled. 2. Paper damp. Causes Check procedures/corrective measures 1. Paper curled. Check the paper storage conditions. 2. Paper damp. Check the paper storage conditions. (13) Offset occurs. Causes 1. Defective cleaning blade. Causes Check procedures/corrective measures 1.
Page 85 (15) Fixing is poor. Causes 1. Wrong paper. 2. Flawed press roller. Causes Check procedures/corrective measures 1. Wrong paper. Check if the paper meets specifications. 2. Flawed press roller. Replace the press roller (see page 1-6-26). (16) Image center does not Causes align with the original 1.
Page 86 2DC-2 1-5-4 Electrical problems Problem Causes Check procedures/corrective measures No electricity at the power Measure the input voltage. The machine does outlet. not operate when The power cord is not Check the contact between the power plug and the outlet. the power switch is plugged in properly.
Page 87: The Eraser Lamp Does Not Turn On
Problem Causes Check procedures/corrective measures Broken MP feed clutch Check for continuity across the coil. If none, replace the MP feed The MP feed clutch coil. clutch. does not operate. Poor contact in the MP Reinsert the connector. Also check for continuity within the con- feed clutch connector ter- nector cable.
Page 88: Main Charging Is Not Performed
2DC-2 Problem Causes Check procedures/corrective measures (13) Broken main charger wire. See page 1-5-14. Main charging is not Leaking main charger performed. housing. Poor contact in the high voltage board connector terminals. Defective engine board (KP-5061). Defective high voltage board. (14) Poor contact in the high See page 1-5-14.
Page 89: Mechanical Problems
1-5-5 Mechanical problems Problem Causes/check procedures Corrective measures Check if the surfaces of the feed roller and Clean with isopropyl alcohol. No primary paper feed. MP feed roller are dirty with paper powder. Check if the feed roller and MP feed roller Check visually and replace any deformed are deformed.
Page 90: Precautions For Assembly And Disassembly
2DC-2 1-6-1 Precautions for assembly and disassembly (1) Precautions • Be sure to turn the power switch off and disconnect the power plug before starting disassembly. • When handling PCBs, do not touch connectors with bare hands or damage the board. •...
Page 91: Removing The Process Unit
2DC-2 1-6-2 Removing the process unit 1. Open the front top cover. 2. Open the front cover. 3. Lift the process unit together with the toner container out of the copier. Front top cover Front cover Process unit Figure 1-6-1 Removing the process unit CAUTIONS •...
Page 92: Removing The Principal Outer Covers
1-6-3 Removing the principal outer covers (1) Removing the front top cover/face-down output tray 1. Remove the one screw and then remove the memory cover. 2. Remove the one screw and then remove the rear cover. Screw Rear cover Memory cover Screw Figure 1-6-2 Removing the memory cover and rear cover 3.
Page 93: Removing The Right Cover
(2) Removing the right cover 1. Remove the front top cover/face-down output tray (See page1-6-3). 2. Remove the memory cover (See page 1-6-3). 3. Unlatch the snaps and hook, remove the right cover. Right cover :Snap/Hook (inside cover) Right cover Figure 1-6-4 Removing the right cover (3) Removing the left cover 1.
Page 94: Removing The Feed Roller
1-6-4 Removing the feed roller CAUTION When refit the feed roller, fit the D-cut shaft into the D-shape hole of the feed roller. 1. Remove the paper cassette and the process unit (See page 1-6-2). 2. Stand the machine the front side up. 3.
Page 95: Removing The Mp Feed Roller
1-6-5 Removing the MP feed roller 1. Remove the engine board (See page 1-6-9). 2. Remove one screw. 3. Remove the grounding plate. 4. Remove one stop ring . 5. Remove the MP feed clutch. MP feed clutch Stop ring Grounding plate Screw...
Page 96 6. Remove one screw. 7. Remove the toner sensor and spring. 8. Remove two screws. 9. While pressing the latch by using the driver and then remove the MP feed unit. Toner sensor Screw Screw Spring Screw Latch MP feed unit Figure 1-6-8 Removing the MP feed unit 10.
Page 97: Removing The Transfer Roller
1-6-6 Removing the transfer roller CAUTION Do not touch the transfer roller (sponge) surface. Oil and dust (particles of paper, etc.) on the transfer roller can significantly deteriorate the print quality (white spots, etc.). When refitting the bushes and springs, make sure to refit the black colored bush and spring on the left side. Also, observe the correct direction to which the bush is fit in reference to the paper passing direction.
Page 98: Removing The Principal Circuit Boards
2DC-2 1-6-7 Removing the principal circuit boards (1) Removing the engine board 1. Remove the right cover (See page 1-6-4). 2. Remove all (twelve) connectors from the engine board. 3. Remove three screws. 4. Remove the engine board. * When replacing the board with a new board, remove the EEPROM from the old board and mount it to the new board.
Page 99: Removing The Main Board
(2) Removing the main board 1. Remove the right cover (See page 1-6-4). 2. Remove the three connectors. 3. Remove the one flexible flat cable. 4. Remove the seven screws and then remove the main controller shield (with main board). Main controller shield (with main board) Flexible flat cable...
Page 100 2DC-1 5. Remove two screws at the back of the main board. * When replacing the board with a new board, remove the EEPROM from the old board and mount it to the new board. Main board Screws EEPROM Figure 1-6-13 Removing the main board 1-6-11...
Page 101: Removing The Power Supply Board And High Voltage Board
(3) Removing the power supply board and high voltage board 1. Remove the process unit (See page 1-6-2). 2. Remove the left cover (See page 1-6-4). 3. Remove three connectors from the power supply board. 4. Remove eight screws. 5. Remove the power supply board and high voltage board. (Note: The high voltage board is directly connected to the bias board.) 6.
Page 102: Removing The Bias Board
(4) Removing the bias board 1. Remove the cassette and process unit (See page 1-6-2). 2. Remove the left cover (See page 1-6-4). 3. Remove the power supply board and high voltage board (See the previous page). 4. Stand the machine with the front side up. 5.
Page 103: Removing The Main Motor And Drive Unit
2DC-2 1-6-8 Removing the main motor and drive unit 1. Remove the cassette and process unit (See page 1-6-2). 2. Remove the right cover (See page 1-6-4). 3. Remove three connectors from the main motor. 4. Remove four screws. 5. Remove main motor. Connectors Main motor Screws...
Page 104 6. Remove the engine board (See page 1-6-9). 7. Remove wires from wire saddles on the cord cover. 8. Remove one screw. 9. Remove the cord cover. Wire saddle Screw Wire saddles Cord cover Figure 1-6-17 Removing the cord cover 1-6-15...
Page 105 10. Remove the main board (See page 1-6-10). 11. Remove one screw and then remove the grounding plate. 12. Remove one screw and then remove the feed clutch. 13. Remove three stop rings. 14. Remove MP feed clutch (gear), feed clutch (gear), and registration clutch (gear). MP feed clutch (gear) Grounding Stop ring...
Page 106 15. Remove the four screws. 16. Remove the drive unit. Drive unit Screws Figure 1-6-19 Removing the drive unit 1-6-17...
Page 107: Removing And Splitting The Fuser Unit
1-6-9 Removing and splitting the fuser unit WARNING • The fuser unit is hot after the copier was running. Wait until it cools down. CAUTION • When refitting the fuser unit, make sure the fuser unit gear and the copier’s drive gear are properly meshed with each other.
Page 108 6. Remove two screws. 7. Open and split the fuser unit. Screw Fuser unit Screw Figure 1-6-21 Splitting the fuser unit 1-6-19...
Page 109: Removing The Separation Craws
(1) Removing the separation claws WARNING The separation claws are extremely hot immediately after the copier was running. Allow substantial period of time until it cools down. 1. Remove and split the fuser unit (See page 1-6-18). 2. Loosen the stopper screws. 3.
Page 110: Removing The Heater Lamp
(2) Removing the heater lamp WARNING • The heater lamp is extremely hot immediately after the copier was running. • Allow substantial period of time until it cools down. Also, the heater lamp is fragile: Handle it with great care. CAUTION •...
Page 111: Removing The Heat Roller
(3) Removing the heat roller WARNING • The heat roller is extremely hot immediately after the copier was running. Allow substantial period of time until it cools down. 1. Remove and split the fuser unit (See page 1-6-18). 2. Remove the heater lamp (See previous page). 3.
Page 112 4. Remove the heat gear Z33, heat R bush, and heat L bush from the heat roller. Heat gear Z33 Heat R bush Heat L bush Heat roller Figure 1-6-25 Removing the heat roller 1-6-23...
Page 113: Removing The Thermistor
(4) Removing the thermistor 1. Remove and split the fuser unit (See page 1-6-18). 2. Remove the heater lamp (See page 1-6-21). 3. Remove the heat roller (See page 1-6-22). 4. Remove one screw. 5. Remove the thermistor. Screw Thermistor Figure 1-6-26 Removing the thermistor 1-6-24...
Page 114: Removing The Thermal Cutout
(5) Removing the thermal cutout CAUTION • Do not bend the terminals of the thermal cutout. 1. Remove and split the fuser unit (See page 1-6-18). 2. Remove the heater lamp (See page 1-6-21). 3. Remove the heat roller (See page 1-6-22). 4.
Page 115: Removing The Press Roller
(6) Removing the press roller WARNING • The press roller is extremely hot immediately after the copier was running. Allow substantial period of time until it cools down. 1. Remove and split the fuser unit (See page 1-6-18). 2. Remove the press roller from the fuser unit. Press roller Fuser unit Figure 1-6-28 Removing the press roller...
Page 116: Removing The Scanner Unit
1-6-10 Removing the scanner unit 1. Remove the right and left cover (See page 1- 6-4). 2. Remove the five connectors and two flexible flat cables from the scanner board. 3. Remove the five screws and then remove the scanner board. Screw Scanner board Screws...
Page 117 4. Remove the two screws. 5. Slide the scanner unit and then remove the scanner unit. Scanner unit Screws Figure 1-6-30 Removing the scanner unit 1-6-28...
Page 118 1. Remove the scanner unit (See page 1-6-27). 2. Remove each two screws and then remove two grounding plates. 3. Remove each two screws and then remove the right and left scanner stays. Screws Screws Left scanner stay Grounding plates Right scanner stay Screws Figure 1-6-31 Removing the right and left stays...
Page 119 6. Remove three screws. 7. Remove two connectors from the laser scanner unit. 8. Remove the laser scanner unit. * When refitting the laser scanner unit, tighten a screw in order of 3 from 1. Screws Laser scanner unit Conncetor Conncetor Figure 1-6-33 Removing the laser scanner unit 1-6-30...
Page 120 9. Remove the eraser lamp. Eraser lamp 5-2-34 Removing the eraser lamp 1-6-31...
Page 121: Removing The Isu Unit
1-6-12 Removing the ISU unit 1. Unhook the two hooks by using screw driver through the holes and then remove the operation unit. Hole Operation unit Hook Hook Hole Figure 1-6-35 Removing the operation unit 2. Remove two screws and then remove the original holder cover.
Page 122 3. Remove two screws and then remove two grounding plates. 4. Remove the one stopper ring and then detach the scanner shaft. * Detach the shaft taking care to tilt it as little as possible. Stopper ring Screw Grounding plates Scanner shaft Screw Figure 1-6-37 Detaching the scanner shaft...
Page 123: Removing The Exposure Lamp
1-6-13 Removing the exposure lamp 1. Remove the ISU unit (See page 1-6-32). 2. Remove the two connectors from the inverter board. 3. Remove the one screw and then remove the inverter board. ISU unit Inverter board Screw Connectors Figure 1-6-39 Removing the inverter board 4.
Page 124 5. Remove the exposure lamp and cables from the exposure lamp mount. • Do not touch the glass surfaces of the exposure lamp with bare hands. Exposure lamp Exposure lamp mount Cables Figure 1-6-41 Removing the exposure lamp 1-6-35...
Page 125: Removing The Scanner Mirror A
1-6-14 Removing the scanner mirror A 1. Remove the ISU unit (See page 1-6-32). 2. Remove the exposure lamp (See page 1-6- 34). 3. Unhook the two mirror A holders and then Mirror A holder remove the scanner mirror A. Scanner mirror A Hook Mirror A holder...
Page 126: Removing The Scanner Motor
1-6-15 Removing the scanner motor 1. Remove the original holder cover (See page 1-6-32). 2. Remove the left cover (See page 1-6-4). 3. Remove the one connector from the scanner board. Scanner board Connector Figure 1-6-43 Removing the scanner motor (1) Screw 4.
Page 127 7. Remove three screws and then remove the grounding plate. Screws Grounding plate Screw Figure 1-6-46 Removing the scanner motor (4) 8. Remove the one stopper ring and then detach the scanner shaft. Stopper ring * Detach the shaft taking care to tilt it as little as possible.
Page 128 9. Remove the cable from the cable clamps. 10. Remove the four screws and then remove the scanner motor mount with scanner motor. Screws Screw Scanner motor mount Cable Cable clamps Figure 1-6-48 Removing the scanner motor (6) 11. Remove the one screw and then remove the scanner motor.
Page 129: Removing The Main Charger Unit
1-6-16 Removing the main charger unit 1. Remove the process unit from the copier (See page 1-6-2). 2. Unlatch the three snaps, and remove the main charger cap. 3. Draw the main charger unit in the direction of arrow A, then pull it out in the direction of arrow B. Main charger unit Snap...
Page 130: Adjustment The Maintenance Mode
2DC-2 1-6-17 Adjustment the maintenance mode (1) Adjusting the leading edge registration of image printing Make the following adjustment if there is a regular error between the leading edges of the copy image and original. U066 U071 U034 (P. 1-6-47) (P.
Page 131: Adjusting The Center Line Of Image Printing
(2) Adjusting the center line of image printing Make the following adjustment if there is a regular error between the center lines of the copy image and original when paper is fed from the drawer. U067 U072 U034 (P. 1-6-48) (P.
Page 132: Adjusting The Margins For Printing
(3) Adjusting the margins for printing Make the following adjustment if the margins are not correct. U403 U404 U402 (P. 1-6-49) (P. 1-6-54) Caution: Check the copy image after the adjustment. If the margins are still incorrect, perform the above adjustments in maintenance mode.
Page 133: Adjusting The Amount Of Slack In The Paper
2DC-2 (4) Adjusting the amount of slack in the paper Make the following adjustment if the leading edge of the copy image is missing or varies randomly, or if the copy paper is Z-folded. Procedure Start Enter maintenance mode. Enter “051” using the copy exposure Correct image Output Output...
Page 134: Adjusting Magnification Of The Scanner In The Main Scanning Direction
(5) Adjusting magnification of the scanner in the main scanning direction Perform the following adjustment if the magnification in the main scanning direction is not correct. U065 U065 U067 (auxiliary scanning (main scanning (P. 1-6-48) direction) (P. 1-6-46) direction) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode.
Page 135: Adjusting Magnification Of The Scanner In The Auxiliary Scanning Direction
(6) Adjusting magnification of the scanner in the auxiliary scanning direction Perform the following adjustment if the magnification in the auxiliary scanning direction is not correct. U065 U065 U070 (main scanning (auxiliary scanning (P. 1-6-50) direction) (P. 1-6-45) direction) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode.
Page 136: Adjusting The Scanner Leading Edge Registration
(7) Adjusting the scanner leading edge registration Perform the following adjustment if there is regular error between the leading edges of the copy image and original. U034 U071 U066 (P. 1-6-41) (P. 1-6-51) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure Start Enter maintenance mode.
Page 137: Adjusting The Scanner Center Line
(8) Adjusting the scanner center line Perform the following adjustment if there is a regular error between the center lines of the copy image and original. U034 U072 U067 (P. 1-6-42) (P. 1-6-53) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure Scanner center line Start...
Page 138: Adjusting The Margins For Scanning An Original On The Contact Glass
(9) Adjusting the margins for scanning an original on the contact glass Perform the following adjustment if the margins are not correct. U402 U404 U403 (P. 1-6-43) (P. 1-6-54) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure (3 ±...
Page 139: Adjusting The Dp Magnification
2DC-2 (10) Adjusting the DP magnification Adjust magnification in the auxiliary scanning direction if magnification is incorrect when the DP is used. U065 U070 (P. 1-6-46) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure Main scanning direction...
Page 140: Adjusting The Dp Leading Edge Registration
2DC-2 (11) Adjusting the DP leading edge registration Perform the following adjustment if there is a regular error between the leading edge of the original and the copy image. U034 U066 U071 (P. 1-6-41) (P. 1-6-47) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure Start Enter maintenance mode.
Page 141: Adjusting The Dp Trailing Edge Registration
(12) Adjusting the DP trailing edge registration Perform the following adjustment if the original scanning end position is not correct when the DP is used. Caution: If the copy image looks like copy example 2, clean the DP original scanning section. Procedure Start Enter maintenance mode.
Page 142: Adjusting The Dp Center Line
2DC-2 (13) Adjusting the DP center line Perform the following adjustment if there is a regular error between the centers of the original and the copy image. U034 U067 U072 (P. 1-6-42) (P. 1-6-48) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure Reference Start...
Page 143: Adjusting The Margins For Scanning The Original From The Dp
(14) Adjusting the margins for scanning the original from the DP Perform the following adjustment if margins are not correct. U402 U403 U404 (P. 1-6-43) (P. 1-6-49) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure (3 ±...
Page 144 (14) Adjusting the margins for scanning the original from the DP Perform the following adjustment if margins are not correct. U402 U403 U404 (P. 1-6-43) (P. 1-6-49) Caution: Before making the following adjustment, ensure that the above adjustments have been made in maintenance mode. Procedure (3 ±...
Page 145: Upgrading The Firmware On The Main Pcb
2DC-3 1-7-1 Upgrading the firmware on the main PCB Firmware upgrading requires the following tools: Flash DIMM (P/N 2DC01090) Procedure 1. Run maintenance mode U019 to check the version of the ROM. 2. Turn the power switch off and disconnect the power plug.
Page 146: Paper Feeding System
2-1-1 Paper feeding system The paper feeding system picks up paper from the cassette, MP tray, or if installed, the paper feeder, feeds it in the copier, and delivers in the output tray. Paper is fed at the precise timing in synchronization with data processing. The paper feeding system finally delivers the printed page to either the face-down or face-up tray as manipulated by the user.
Page 147: Paper Feed Control
(1) Paper feed control The following diagram shows interconnectivity of the feeding system components including the sensors and rollers. The engine board provides the signals in conjunction with the electrophotography process that is driven by the main board. Power train Toner container Process unit Registration...
Page 148: Paper Feeding Mechanism
(2) Paper feeding mechanism Driving power train A For process unit; drum (From main unit) B For process unit; toner container, developing roller etc. (From main unit) C From process unit; drum (To transfer roller) & ﬂ ﬁ 1 Main motor (gear) ›...
Page 149: Original Scanning System
2-1-2 Original scanning system The scanner unit consists of the image scanning unit (ISU) for main-direction scanning, and drive part for traveling the ISU unit to sub-direction. ^ & ⁄ ¤ › ) ‹ Figure 2-1-4 Scanner unit 1 Original holder # Scanner gear 39/22 2 Scanner upper frame $ Scanner shaft...
Page 150 Original Scanner unit ISU unit Scanner board Exposure Main board lamp image YC1-2 YC1-4 sensor YC1-3 YC1-5 CCDCLKN YC1-4 YC1-14 Inverter CCDCLK YC1-5 YC1-12 CCD board board YC1-8 YC1-10 YC1-10 YC1-8 LAMP YC2-2 YC1-12 YC1-6 CCDG(O) YC1-16 YC1-18 CCDB(E) YC1-18 YC1-20 CCDR YC1-22...
Page 151: Isu Unit
(1) ISU unit The ISU unit consists of an exposure lamp, three mirrors, an ISU lens, a CCD board, and so on. Also an inverter board for driving the exposure lamp and a scanner home position sensor for detecting the home position of the ISU unit are incorporated.
Page 152: Electrophotographic System
2-1-3 Electrophotographic system Electrophotography is the technology used in laser printing which transfer data representing texts or graphics objects into a visible image which is developed on the photosensitive drum, finally fusing on paper, using light beam generated by a laser diode. This section provides technical details on the copier’s electrophotography system.
Page 153: Process Unit Mechanism
(1-1) Process unit mechanism Driving power train A For drum (From main unit) B For toner container, developing roller, etc. (From main unit) C For main unit (Transfer roller) D For toner container ¤ & ⁄ ‹ Figure 2-1-8 Process unit mechanism 1 Main charger unit # DLP screw B 2 Charger wire...
Page 154: Main Charging
(2) Main charging (2-1) Photo conductive drum The durable layer of organic photoconductor (OPC) is coated over the aluminum cylinder base. The OPC tend to reduce its own electrical conductance when exposed to light. After a cyclic process of charging, exposure, and development, the electrostatic image is constituted over the OPC layer.
Page 155: Charging The Drum
(2-2) Charging the drum The following shows a simplified diagram of the electrophotographic components in relation to the engine system. Charging the drum is done by the main charger unit A. High voltage board Engine board Bias board MHVDR CN2-A4 YC8-5 YC-M Main charging output...
Page 156: Exposure
(3) Exposure The charged surface of the drum A is then scanned by the laser beam from the laser scanner unit B. Figure 2-1-11 Exposure The laser beam (780 nm wavelength) beam is dispersed as the polygon motor (polygon mirrors) revolves to reflect the laser beam over the drum.
Page 157: Laser Scanner Unit
(3-1) Laser scanner unit Diversion mirror Figure 2-1-12 Laser scanner unit 1 Laser diode ........... Emits diffused, visible laser. 2 Cylindrical lens ..........Compensates the vertical angle at which the laser beam hits a polygon mirror segment. 3 Polygon mirror (motor) ........Has six mirror segments around its hexagonal circumference; each mirror corresponding to one scanned line width on the drum when laser beam scans on it.
Page 158: Drum Surface Potential
(3-2) Drum surface potential The laser beam is continually switched on and off depending on the print data. It is on for a black (exposed) dot and off for a white (blank) dot. Since the drum surface is evenly charged, whenever it is illuminated by the laser beam, the electrical resistance of the photoconductor is reduced and the potential on the photoconductor is also lowered.
Page 159: Development
(4) Development The latent image constituted on the drum is developed into a visible image. The developing roller A contains a 3-pole (S-N-S) magnet core B and an aluminum cylinder rotating around the magnet core B. Toner attracts to the developing roller A since it is powdery ink made of black resin bound to iron particles.
Page 160: Transfer
(5) Transfer The image developed by toner on the drum A is transferred onto the paper because of the electrical attraction between the toner itself and the transfer roller B. The transfer roller is negatively biased so that the positively charged toner is attracted onto the paper while it is pinched by the drum and the transfer roller.
Page 161: Fusing
(6) Fusing The toner on the paper is molten and pressed into the paper as it passes between the heat roller A and the press roller B in the fuser unit. Figure 2-1-16 Fusing The heat roller has a halogen lamp inside which continuously turns on and off by the thermistor to maintain the constant temperature onto the heat roller surface.
Page 162: Fuser Unit Mechanism
(6-1) Fuser unit mechanism Figure 2-1-17 Fuser unit mechanism 1 Heat roller 7 Heater lamp 2 Idle gear Z34 8 Thermal cutout 3 Exit gear Z23 9 Separator(s) 4 Idle gear Z18 0 Thermistor 5 Heat gear Z33 ! Exit pulley(s) 6 Press roller @ Lower exit roller 2-1-17...
Page 163: Cleaning
(7) Cleaning After the transferring process, the drum needs to be physically cleaned of toner which is residual after the development process. The cleaning blade A is constantly pressed against the drum B and scrapes the residual toner off to the sweep roller C.
Page 164: Electrical Parts Layout
2-2-1 Electrical parts layout (1) Main unit D 4 % & Figure 2-2-2 Main unit 1 Main board (KP-5060) 7 Cooling fan 2 Engine board (KP-5061) 8 Registration clutch 3 Power supply board (KP-5059) 9 Feed clutch A Power switch 0 MP feed clutch B Exit sensor ! MP paper sensor...
Page 165: Scanner Unit
(2) Scanner unit Figure 2-2-2 Scanner unit 1 Operation board 2 CCD board (KP-5065) 3 Scanner board (KP-5063) 4 Inverter board 5 Scanner home position sensor 6 Scanner motor 7 Exposure lamp 2-2-2...
Page 166: Main Board
2-3-1 Main board Scanner I/F CCDCLKN, CCDCLK, RSN, CPN, SH 2.5V Regulator IMG7-0 +2.5V ADCCLK, SHD, LCLP CCDG(O) OEB, AFESDENB CCDG(E) A F/E AFESDIN, AFESDCLK CCDR Xtal Operator panel I/F (SYSTEM) KEYON, KEY1N, EY2N Xtal (VIDEO) 9.71MHz SCANON, SCAN1N, SCAN2N, SCAN3N 17.483375MHz SCAN4N, SCAN5N Xtal (CCD)
Page 167: Engine Board
2-3-2 Engine board Scanner Engine board (KP-5061) motor ISUMOTA, ISUMOTNA Scanner ISUMOTB, ISUMMOTONB board (KP-5063) Optional Main board LAMP , LAMPHI, LAMPLOW (KP-5060) RSTIN HPSWN PLGCLK Scanner board home +24V3 position Reset IC RSTN sensor Inverter board Exposure PLGDRN lamp PFMDRN PLGRDYN PFSEN, PFPFPER, PFCLK...
Page 168 (1) Eraser lamp control circuit The CPU (U1) turns pin #86 (ERASER) of U1 to H level, transistors (Q18) turns on consequently, and the 24 V DC given at pin #1 of connector YC14 applies to the eraser lamps. The eraser lamps thus illuminate as the current flows through the eraser lamp, the pin #2 of connector YC14, resistors (R109, R110, and R111), transistor Q18 and the ground.
Page 169: Heater Lamp Control Circuit
(2) Heater lamp control circuit Activation of the heater lamp is dominated by the HEAT signal which is derived by the engine CPU (U1) at its pin #74. When its level is high, transistor Q8 turns on, photo-triac PC2 and triac TRC1 turn on simultaneously, and the heater lamp is applied with the primary AC voltage in turn.
Page 170 The AC power for the heater is applied in one of the five variations of the zero cross switchings as shown in Figure 2-3-5. Each variation is constituted with the unit of ten positive and negative envelops in five cycles, as obtained by varying the duration during which TRC1 turns on.
Page 171 Heater lamp turn-on pattern in 1 cycle (10 half waves) AC wave Variation No.1 (Duty 100 %) Zero − cross point Conductivity staus of Triac (TRC1) Variation No.2 (Duty 80 %) − Variation No.3 (Duty 60 %) − Variation No.4 (Duty 40 %) −...
Page 172: Polygon Motor Control Circuit
(3) Polygon motor control circuit The main controller board supplies the 2598.4 Hz clock pulse (PLGCLK) via the engine board to the PLL control IC (IC1) for the polygon motor. To begin printing, the engine CPU U1 turns PLGDR to H level, the PLL control IC (IC1) starts to revolve the polygon motor so that the revolution is 25,984 rpm which depends on the PLGCLK clock pulse.
Page 173: Power Supply Board
2-3-3 Power supply board The power supply board provides the AC power input and DC power and outputs. The high voltage bias generator circuit is mounted on a separate board. A simplified schematic diagram is shown below. Power supply unit Power Current switch...
Page 174: Bias Board
2-3-4 Bias board The bias board contains the developing bias output circuit, registration sensor, paper empty sensor, and the cassette switch. It also provides a liaison connection to the high voltage board, power supply, and the toner sensor. Bias board (KP-5067) Engine board Toner TONEREPY...
Page 175: High Voltage Board
2-3-5 High voltage board The high voltage board contains the high voltage output circuit, interlock switch circuit as well as providing a liaison connection with the power supply board, bias board, and the engine board. High voltage board High voltage output circuit Engine board Main Bias board...
Page 176: Interlock Switch
(1) Interlock switch The interlock switch is located on the high voltage board and opened and closed in conjunction with the front cover or the front top cover via the interlock lever. This switch connects and disconnects the +24 V DC power supply line. If the front cover or the front top cover is open, the interlock switch is open, and the +24 V DC to the high voltage output circuit, bias board, engine board, and the power supply board is disconnected, deactivating the high voltage output, laser output, main motor output for safety.
Page 177: Ccd Board
2-3-6 CCD board The CCD board consists mainly of a CCD sensor (U4) that scans an original. The CCD sensor (U4) is driven to scan an original by the CCD sensor control signals (CCDCLKN, SH_BW, SH_RGB, SW, SWN, CPN, and RSN) based on the clock for driving the CCD sensor (CCDCLK) supplied from the main board through the scanner board.
Page 178: Operation Board
2-3-7 Operation board The operation board consists of key switches, LEDs and 7-segment LED. The lighting of LEDs is determined by scan signals (SCAN0N to SCAN5N) and LED lighting selection signals (LED0N to LED7N) from the main board. The key switches operated are identified by the scan signals (SCAN0N to SCAN5N) and the return signals (KEY0N to KEY2N).
Page 179: Scanner Board
2-3-8 Scanner board The scanner board consists of scanner driver circuit Q1 to Q5 and exposure lamp driver circuit U1, relays signals from engine board, main board, operation board, CCD board and optional document processor. Scanner board ISUMOTA MOTA MOTNA ISUMOTNA Driver Scanner...
Page 180 2-4-1...
Page 181 2-4-2...
Page 182 2-4-3...
Page 183: Wiring Diagram
2DC-1 Wiring diagram To optional document feeder GND/ GND 30/29 BUZERDRN/KEY1N 18/17 GND/SW 28/27 KEY0N/ SCAN7N 16/15 SWN/SH HPSWN 26/25 SCAN6N/ SCAN5N 14/13 GND/CPN 24/23 Optional DIMM slot SCAN4N/ SCAN3N 12/11 GND/RSN 9/10 22/21 SCAN2N/ SCAN1N 10/9 9/10 GND/CCDCLK 11/12 20/19 Scanner 11/12...

Kyocera KM-1500 Service Manual

Quick Links

Related Manuals for Kyocera KM-1500

Summary of Contents for Kyocera KM-1500

Table of Contents