REPLACEMENT AND ADJUSTMENT Ricoh MP C2004 C2504 Service Manual

The main power button of this machine has been changed to a push-button switch (push button) from the conventional rocker switch. The push switch has characteristics and specifications different from the rocker switch. Care must be taken when replacing and adjusting parts.

The push switch in this machine uses DC (direct current). Therefore, if the AC power cord is connected to an electrical outlet, power is supplied to the controller board, the operation unit and other modules even when the main power is turned OFF. When replacing the controller board and the operation unit in this state, not only these boards, it will damage other electrical components.

So, when performing maintenance work such as replacing parts, in addition to turning off the main power with the push switch, always unplug the AC power cord.

When you disconnect the power cord from the AC wall outlet, inside the machine there is still residual charge.

When you disconnect the power cord from the AC wall outlet, inside the machine for a while there is still residual charge. Therefore, if you remove boards in this state, it can cause a blown fuse or memory failure.

After you unplug the power cord from the AC wall outlet, in order to remove the residual charge from inside the machine, be sure to press the main power switch. Thus, the charge remaining in the machine is released, and it is possible to remove boards.

When you reconnect the AC power cord into an AC wall outlet, the machine will start automatically.

In order to remove the residual charge, push the main power switch while you disconnect the AC power cord. At that time, the power ON flag inside the machine is set. Therefore, after you finish work on the machine and reconnect the power cord to the AC, even if you do not press the main power switch, the machine will start automatically and the moving parts will begin to move. When working on moving parts, be careful that fingers or clothes do not get caught.

NOTES ON THE MAIN POWER SWITCH PUSH SWITCH Characteristics of the Push Switch (DC Switch)Shutdown Method Forced Shutdown BEFOREHAND SPECIAL TOOLS EXTERIOR COVERS OVERVIEW Front and Rear Side Covers Right and Left Side Covers Paper Exit Covers Inner Covers FRONT COVER CONTROLLER COVER UPPER LEFT COVER LEFT REAR COVER LEFT COVER REAR COVER REAR LOWER COVER RIGHT REAR COVER RIGHT UPPER COVER FRONT UPPER COVER PROXIMITY SENSOR (HUMAN DETECTION SENSOR)MAIN POWER SWITCH COVER WASTE TONER COVER INVERTER TRAY PAPER EXIT TRAY PAPER EXIT COVER PAPER EXIT LOWER COVER PAPER EXIT FRONT COVER INNER UPPER COVER INNER LOWER COVER SMART OPERATION PANEL OPERATION PANEL UNIT USB CABLE ADF ADF REMOVAL SCANNER UNIT BEFORE YOU BEGIN SCANNER EXTERIOR Scanner Front Cover Scanner Right Cover Scanner Left Cover Scanner Upper Cover EXPOSURE GLASS SCANNER CARRIAGE Cleaning the Scanner Carriage Mirror SCANNER MOTOR APS SENSOR SCANNER HP SENSOR ARDF/PLATEN COVER SENSOR SCANNER FFC When Changing the FFC LASER UNIT POLYGON MIRROR MOTOR Adjustment after Replacing the Polygon Mirror Motor SP DESCRIPTIONS PCDU PCU/DEVELOPMENT UNIT Before Replacing a PCU Before Replacing a Development Unit Replacement Notes for Assembling PCU/Development Unit Method for Checking after Replacement Adjustment after Replacing the PCU and/or the Development Unit IMAGING TEMPERATURE SENSOR (THERMISTOR)WASTE TONER WASTE TONER BOTTLE Before Replacing the Waste Toner Bottle Replacement IMAGE TRANSFER UNIT IMAGE TRANSFER BELT UNIT What to Do before Replacing the Image Transfer Belt Replacement IMAGE TRANSFER CLEANING UNIT What to Do before Replacing the Image Transfer Cleaning Unit Replacement IMAGE TRANSFER BELT Attaching the Belt Adjustment after replacing the Image transfer belt PAPER TRANSFER ROLLER When reinstalling the paper transfer roller PAPER TRANSFER ROLLER UNIT What to Do before Replacing the Paper Transfer Roller Unit Replacement FUSING ENTRANCE SENSOR TM/ID SENSOR Before Replacing the TM/ID sensor Replacement procedure Adjustment after Replacing the TM/ID sensor TEMPERATURE AND HUMIDITY SENSOR ITB CONTACT AND RELEASE SENSOR IMAGE TRANSFER LOCK UNIT Installing the Image Transfer Lock Unit DRIVE UNIT OVERVIEW PAPER FEED MOTOR TRANSPORT MOTOR PAPER TRANSFER CONTACT AND RELEASE MOTOR UNIT IMAGING DRIVE UNIT PCU MOTOR: CMY DEVELOPMENT MOTOR: CMY DEVELOPMENT SOLENOID PCU MOTOR: BLACK / ITB DRIVE MOTOR REGISTRATION MOTOR FUSING MOTOR PAPER EXIT/ PRESSURE RELEASE MOTOR DUPLEX ENTRANCE MOTOR TONER SUPPLY MOTOR SUB HOPPER K C M Y TONER END SENSOR TONER BOTTLE DRIVE MOTOR K C M Y ID CHIP CONTACT BOARD K C M Y TRANSPORT COIL UNIT Y M C K FUSING UNIT FUSING ENTRANCE GUIDE PLATE Cleaning the Fusing Entrance Guide Plate FUSING EXIT GUIDE PLATE Cleaning the Fusing Exit Guide Plate FUSING UPPER COVER FUSING LOWER COVER FUSING SLEEVE BELT UNIT Adjustment before Replacing the Fusing Sleeve Belt Unit Replacement PRESSURE ROLLER Adjustment before Replacing the Pressure Roller Replacement FUSING SLEEVE THERMOSTAT UNIT NON-CONTACT THERMISTOR PRESSURE ROLLER THERMISTOR THERMOPILE UNIT PRESSURE ROLLER HP SENSOR FUSING EXIT DRIVE SOLENOID PAPER EXIT PAPER EXIT UNIT PAPER EXIT SOLENOID PAPER EXIT SENSOR REVERSE SENSOR REVERSE MOTOR FUSING EXIT SENSOR PAPER FEED PAPER FEED UNIT 1st Paper Feed Unit 2nd Paper Feed Unit PAPER DUST COLLECTION UNIT PICK-UP ROLLER, PAPER FEED ROLLER, SEPARATION ROLLER, TORQUE LIMITER ST TRAY LIFT MOTOR/ 2ND TRAY LIFT MOTOR TRANSPORT SENSOR UPPER LIMIT SENSOR PAPER END SENSOR REGISTRATION SENSOR BYPASS TRAY UNIT BYPASS TRAY BYPASS PAPER END SENSOR BYPASS PICK-UP ROLLER BYPASS PAPER FEED ROLLER BYPASS SEPARATION ROLLER/TORQUE LIMITER BYPASS WIDTH SENSOR BYPASS LENGTH SENSOR DUPLEX UNIT DUPLEX/BYPASS MOTOR DUPLEX ENTRANCE SENSOR DUPLEX EXIT SENSOR ELECTRICAL COMPONENTS OVERVIEW Printed Circuits/Parts inside the Controller Box Printed Circuits behind the Controller Box Printed Circuit/Parts inside the Power Box Printed Circuits behind the Power Box CONTROLLER BOX COVER IPU BCU When installing the new BCU Replacing the NVRAM (EEPROM) on the BCU CONTROLLER BOARD Replacing the NVRAMs on the Controller Board HDD Adjustment after replacement CONTROLLER BOX IMAGING IOB HVP_TTS PSU (AC CONTROLLER BOARD)PSU (DC POWER)POWER SUPPLY BOX PAPER TRANSPORT IOB HVP-CB HVP-CB with Bracket PROXIMITY SENSOR (HUMAN DETECTION SENSOR) BOARD FANS/FILTERS OZONE FILTER/DUST FILTER Adjustment before Replacing the Dust Filter Replacement DEODORIZATION FILTER DEVELOPMENT INTAKE FAN OZONE EXHAUST FAN PAPER EXIT COOLING FAN FUSING EXHAUST FAN TONER SUPPLY COOLING FAN PSU COOLING FAN CONTROLLER BOX COOLING FAN IMAGE ADJUSTMENT AUTO COLOR CALIBRATION SCANNING Scanner Sub-scan Magnification Scanner Leading Edge and Side-to-side Registration ARDF ARDF Side-to-side, Leading Edge Registration and Trailing Edge ARDF Sub-scan Magnification REGISTRATION Image Area Leading Edge Side to Side Adjustment Standard Paper Registration Standard Adjustment Procedure ERASE MARGIN ADJUSTMENT ADJUSTING THE TONE OF THE PRINTED IMAGE ADJUSTMENT BY CHANGING THE PRINTER DRIVER SETTING Opening the Printer Driver's "Color Balance Details" Window Color Balance Details Window Adjusting the Tone in the "Color Balance Details" Window Adjustment Examples ADJUSTMENT BY CHANGING THE MACHINE’S PROFILE SETTING Procedure to Change the Profile Setting Patterns and Tendency of the Tone for Each Profile PRINTER GAMMA CORRECTION COLOR REGISTRATION Check the Occurrence of Color Registration Errors Judgment for Type of Color Registration Error