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Service Guide OL1200
Chapter 0 About This Manual

OL1200 LED Page Printer

Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual. 09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi, which is ideal for printing, but does not view on most displays well.

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Table of Contents

Page

Service Guide OL1200
0 About This Manual Front Cover 1 Configuration 1. Configuration 1.2 Printer Configuration 1.3 Optional Configuration 1.4 Specification 1.5 Safety Standards ....1.5.2 Warning Label 2 Operation Description 2. Operation Description 2.1 Main Control Board (Aolm-Pcb) 2.2 Power/Sensor Board 2.3 Relay/Driver Board (Aolc Board) 2.4 Electro-Photographic Process ....2.4.2 Electro-Photographic Process ....2.4.3 Process Operation Descriptions ........(2) Feeding ........(3) Charging ........(4) Exposure ........(5) Developing ........(6) Transfer ........(7) Fusing ........(8) Cleaning ........(9) Cleaning Of Rollers 2.5 Paper Jam Detection 2.6 Cover Open 2.7 Toner Low Detection 2.8 Stacker-Full Detection 2.9 Page Size Detection 3 Parts Replacement 3. Parts Replacement 3.1 Precautions For Parts Replacement ........[Service Tools] 3.2 Parts Layout 1- 4 ....Parts Layout 2 - 4 ....Parts Layout 3 - 4 ....Parts Layout 4 - 4 3.3 How To Change Parts ....3.3.1 Rear Cover, Side Cover (L) Assy, Face-Up Stacker Assy, And I/F Cover Assy. ....3.3.2 Contact Assy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Table of Contents ....3.3.3 Dc Fan Motor ....3.3.4 Manual Feed Hopper Assy ....3.3.5 Side Cover (R) (Operator Panel Assy) ....3.3.6 Earth Plate Bk (R) (Aolm-Pcb, Ic Cover) ....3.3.7 Stacker Cover Assy, Damper Arm, And Washer ....3.3.8 Damper ....3.3.9 Stacker Full Sensor Assy ....3.3.10 Cable Cover (Cable Guides A And B) ....3.3.11 Eject Roller Assy ....3.3.12 Paper Supply Guide D ....3.3.13 Separator F ....3.3.14 Front Feeder Roller Assy ....3.3.15 Hopping Motor ....3.3.16 Front Feeder Paper End Sensor ....3.3.17 Main Chassis Unit ....3.3.18 Registration Roller ....3.3.19 Drum Motor ....3.3.20 Idle Gear ....3.3.21 Fusing Assy ....3.3.22 Fuser Pressure Roller ....3.3.23 Ep Lock Shaft ....3.3.24 Hopping roller Assy ....3.3.25 Outlet sensor lever ....3.3.26 Toner sensor lever ....3.3.27 Paper sensor lever ....3.3.28 Inlet sensor lever ....3.3.29 Insulator ....3.3.30 Paper end lever ....3.3.31 Guide rail (L) Assy ....3.3.32 Guide rail (R) Assy ....3.3.33 IC card cover ....3.3.34 LED head ....3.3.35 Separator Assy ....3.3.36 Transfer roller 4 Adjustment 4. Adjustment 4.1 Maintenance Modes And Functions ....4.1.1 User maintenance mode ........User maintenance mode menu system ....4.1.2 System maintenance mode ........System maintenance mode menu system ....4.1.3 Engine maintenance mode ........Engine maintenance mode menu system ....4.1.4 EEPROM initialization

Page 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Table of Contents 4.2 Adjustment When Replacing A Part ....4.2.1 Setting of LED head drive time ....4.2.2 Resetting the fuser counter ....4.2.3 Destination setting 5 Periodic Maintenance 5.1 Periodic Parts Replacement 5.2 Cleaning ....5.2.1 Cleaning of LED Lens Array ....5.2.2 Cleaning Page Function 5.3 Lubrication - General Information 6 Troubleshooting Procedures 6.1 Troubleshooting Tips 6.2 Points to Check before Correcting Image Problems 6.3 Tips for Correcting Image Problems 6.4 Preparation for Troubleshooting 6.5 Troubleshooting Flow ....6.5.1 LCD status message/trouble list ........LCD Status Messages: (1-4) General ........LCD Status Messages: (2-4) General ........LCD Status Messages: (3-5) Error Controller nn ........LCD Status Messages: (4-4) Error Controller On= xxxxx ....6.5.2 LCD message troubleshooting ........1. The printer does not work normally after being turned on. ........2-1 Paper input jam (1st tray) ........2-2 Paper input jam (front feeder) ........2-3 Paper feed jam ........2-4 Paper exit jam ........3 Paper size error ........4 Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73) ........5 Synchronous serial I/O error (ERROR 74) or I/F time-out between printer and optinal tray (ERROR 81) ........6. I/F time-out occurs between the printer and the operator panel (ERROR 80) . ........7. Communications with the host cannot be performed via the parallel ........8. Data from the host not received via the serial interface. ........9. Data cannot be received through the OKI HSP interface ....6.5.3 Image troubleshooting ........1. Images are light or blurred a whole. ........2. Dark background density ........4. Black belts or stripes in the vertical direction ........5. Cyclic error

Page 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117

Table of Contents ........6. Print voids ........7. Poor fusing ........8. White belts or streaks in the vertical direction 7 Wiring Diagram 7.1 Wiring Diagram 7.2 PCB Layout 7.3 Resistance Check 7.4 Short Plug Setting 8 Parts List 8. Parts List Main Chassis Unit Front Feeder Unit Base Unit A RS-232 Serial Interface Rs-232 Serial Interface B Centronics Parallel Interface Centronics Parallel Interface C High Capacity Second Paper Feeder 2.1 General Mechanism High Capacity Second Paper Feeder ....1.2 External View and Component Names 2. Mechanism Description ....2.2 Hopper Mechanism 3. Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Idle rollers ........3.3.2 AOLT-PCB ........3.3.3 Hopping motor ........3.3.4 Feed roller ........3.3.5 Hopping roller rubber ........3.3.6 Side frame (L) assy ........3.3.7 Side frame (R) assy 4. Troubleshooting ....4.3 Troubleshooting Method ........4.3.1 LCD Status Message List ........4.3.2 Troubleshooting Flow 5. Connection Diagram ....5.2 PCB Layout 6. Parts List D Power Envelope Feeder ....1.1 Functions ....1.2 External View and Component Names 2. General Mechanism

Page 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155

Table of Contents ....2.2 Hopper Mechanism 3. Parts Replacement ....3.2 Parts Layout ....3.3 Parts Replacement Methods ........3.3.1 Separator ........3.3.2 AOLE-PCB ........3.3.3 Square-shaped connector ........3.3.4 Hopping Motor ........3.3.5 Planet gear ........3.3.6 Roller B ........3.3.7 Roller A ........3.3.8 Mini pitch belt & Feed roller 4. Troubleshooting ........4.3.2 Troubleshooting Flow 5. Connection Diagram ....5.2 PCB Layout 6. Parts List

Page 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172

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Service Guide OL1200
Chapter 1 Configuration

1. CONFIGURATION 1.1 System Configuration OL1200 consists of control and engine blocks as the standard configuration (See Figure below 1-1.) In addition, the following options are also available.

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Service Guide OL1200
Chapter 1 Configuration

1.2 Printer Configuration The printer unit consists of the following hardware components: - Electro-photographic processor - Paper feeder - Controller - Operator panel - Power/sensor board Figure 1-2 shows the printer unit configuration.

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Service Guide OL1200
Chapter 1 Configuration

1.3 Optional Configuration The options below are available for use with OL1200. They are sold separately from the printer unit. (1) Power Envelope Feeder

(2) High Capacity Second Paper Feeder

(3) Font Card

(4) RAM module

8MB RAM module

16MB RAM module

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Service Guide OL1200
Chapter 1 Configuration

1.4 Specification (1) Type Desk top (2) External dimensions Height 10.6 (270 mm) (excludes protruding Width 14.4 (366 mm) Portion) Depth 16.9 (430 mm) (3) Weight 15.2 kg (33.5 lbs) (4) Development method Dry electrophotography Exposure method LED stationary head (5) Paper used - Standard paper Xerox 4200 (20 lbs) - Application paper (manual face-up feed) Label Envelope OHP paper (Transparency) - Standard sizes Letter Legal Executive Envelope A4 A5 B5 A6 - Applicable sizes Width: 3.4 to 8.5 (86 to 228 mm) Length: 5.5 to 14 (140 to 355.6 mm) Automatic feed: 16 to 28 lbs (60 to 105 g/m 2 ) Manual feed: Label, OHP paper (transparency) Envelope (6) Printing speed First print: 12 sec. Continuous print: 12 sheets/min. Warm-up time: 90 sec. [at room temperature 77F (25C) and rated voltage (120 VAC)] (7) Paper feed method Automatic feed or manual feed (8) Paper delivery method Face down/face up (9) Resolution 600 x 600 dots/inch (10) Power input 120 VAC + 5.5%, 15% (ODA) 230/240 VAC + 10%, 14% (ODA/OEL) (11) Power consumption Peak: Approx. 600W Typical Operation: Approx. 220W Idle: Approx. 100W Power save mode: Approx. 20W (12) Temperature and humidity During operation: 50 to 90F (10 to 32C) In storage: 14 to 110F (10 to 43C) (13) Noise During operation: 50 dB (A) or less At standby: 45 dB (A) or less Power save mode: 43 dB (A) or less (14) Consumables Toner cartridge kit 5,000 (5% duty) Image drum cartridge 30,000 (at continuous printing) 20,000 (3 page/job) 15,000 (1 page/job)

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Service Guide OL1200
Chapter 1 Configuration

1.5 Safety Standards 1.5.1 Certification label The safety certification label is affixed to the printer in the position below.

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Service Guide OL1200
Chapter 1 Configuration

1.5.2 Warning label The warning label is affixed to the portion which may cause an injury to human body. Follow the instructions on warning labels during maintenance.

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Service Guide OL1200
Chapter 2 Operation Description

2. OPERATION DESCRIPTION OL1200 consists of a control board, a power supply/sensor board, a driver board, an operator panel and an electro-photographic process mechanism. The control board receives data through a host I/F, decodes and edits the data, and stores the edited data in a memory. After completing edition of one page of data, it references the font memory and generates bit data on the same memory. At the same time, it transfers the bit image data to an LED head in units of one dot line. The electro-photographic process mechanism prints data on paper. The operator panel is used for operations and status display. Fig. 2-1 shows an OL1200 block diagram.

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Service Guide OL1200
Chapter 2 Operation Description

2.1 Main Control Board (AOLM-PCB) The control board consists of a one chip CPU, LSIs, a program/font ROM, a DRAM, an EEPROM, a host interface circuit, and a mechanism driving circuit. (1) One-chip CPU The one-chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 33-MHz clock) that incorporates a RISC CPU and its peripheral devices, and has the following functions: Built-in device Chip select controller Bus controller DRAM controller DMA controller Parallel interface controller Serial interface controller Timer Serial I/O port I/O port Option I/O interface Function Control of ROM, DRAM and I/O device Transfer of image data from DRAM to OST LSI Control of Centronics parallel interface Control of RS-232C serial interface Generation of various control timing Monitoring of paper running and paper size Control of operator panel, EEPROM, and options Inputting/outputting of sensor, signal and motor signal Control of OKI HSP interface

(2) Program/font ROM The program/font ROM stores the equipment program and various types of fonts. EPROM/ OTP or masked ROM is used as a program/font ROM. (3) Memory 2-Megabyte DRAM (512K x 4) is mounted as resident memory to be used for storing the program and providing various buffers. This DRAM is expandable up to 34 Mbytes by adding expansion memory (SIMMs). This DRAM provides the areas shown in the following table. Memory capacity setting Memory area Use MENU Expansion RAM

System area

Working area used for the program

Fixed Working area used for the program Enable Enable

Fixed

Raster buffer Receive buffer Page buffer

Stores converted bit image data Stores temporarily the data received from the host interface Adds print information to the analyzed receive data and stores the resulted data. Stores soft fonts and macro data. Stores bit map fonts generated by the font rasterizer based on scalable font information

Expandable Expandable Expandable

DLL/macro buffer Font cache buffer

Expandable Enable Expandable

(4) EEPROM The EEPROM has a 4-kbit capacity and stores the following data. - Menu data - Various counter data (page counter, drum counter, fuser counter, etc.) - Adjustment parameters (LED head drive time, print start position, etc.) (5) LSI (MSM10S0050-015GS) This LSI is connected to the CPU via the bus as a peripheral device of the CPU and controls the memory based on the RAS signal and address signal received from the CPU. (6) LSI (MBCE31701-040FP-BND) This LSI is used as a peripheral device of the CPU and performs smoothing compensation (OST) of print image data (300 dpi and 600 dpi). In addition, it transfers serially bit image data for each dot line to the LED head. (7) Host interface This printer has the following interfaces to the host. - Centronics bidirectional parallel interface - RS232C serial interface - OKI HSP interface (Option) The single effective interface or the automatic interface select mode can be selected using the menu. If the busy state of the printer continues for a long time period, the buffer near-full control releases the busy status at constant intervals even if the host side is busy so not to cause the interface time-out at the host side. (a) Centronics bidirectional parallel interface This is an interface conforming to IEEE-1284 and provides either unidirectional or bidirectional communications according to each of the following communication modes. - Compatibility mode - Unidirectional communications from the host to the printer. - Nibble mode This mode transmits 4-bit wide data from the printer to the host. In this mode, each 1-byte data is

transferred in the form of two nibbles using ERROR, BUSY, FAULT, and SELECT signal leads. This mode can provide the bidirectional operation in combination with the compatibility mode. - ECP mode his mode provides the asynchronous bidirectional interface and transmits and receives 1-byte data using eight data signal leads under the semi-duplex control by the host. When the power is turned on, the compatibility mode is automatically selected. The change to another mode from the compatibility mode is made through negotiation. (When the BI DIRECTION is set to ENABLE in the menu, this change can be performed.) (For the electrical/physical characteristics of this interface, see APPENDIX B) (b) RS232C serial interface The following protocol is supported for the serial interface conforming to EIA RS232C. - READY/BUSY (DTR HI or DTR LO) - X-ON/X-OFF - RBST X-ON (For the electrical/physical characteristics of the interface, see APPENDIX A) (c) OKI HSP interface (Option) This interface (slot) is an OKI unique universal interface that provides the platform to connect various boards (including those supplied by third venders) such as the LAN connection expansion board. Any expansion boards compatible with this interface can be mounted on the Control board without modifying the program at the printer side. The conceptual diagram of the OKI HSP interface is shown in Fig. 2-2.

(For the electrical/physical characteristics of the OKI HSP interface, see the OKI HSP interface technical manual. This manual will not be available to the general public.) (8) RAM module - Pin layout

- Basic specification - Type: 72 pins SIIM (32 bits buss width) - Access time: 60ns, 70ns, 80ns, 100ns - Capacity: 1, 2, 4, 8, or 16MB (16 MB RAM will not be sold by Okidata) - Parity: None

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Service Guide OL1200
Chapter 2 Operation Description

2.2 Power/Sensor Board The power/sensor board consists of an AC filter circuit, a low voltage power supply circuit, a high voltage power supply circuit, heater drive circuit, and photosensors. (1) Low voltage power supply circuit This circuit generates the following voltages. Output voltage +5 V Logic circuit supply voltage Motor and fan drive voltage and source voltage for high-voltage supply RS-232C line voltage RS-232C line voltage and analog circuit supply voltage Use +30 V +8 V 8V

(2) High voltage power supply circuit This circuit generates the following voltages necessary for electro-photographic processing from +30 V according to the control sequence from the control board. When cover open state is detected, +30 V supply is automatically interrupted to stop the supply of all the high-voltage outputs. Output CH DB SB TR CB Voltage -1.30 KV -240 V/+300 V -360 V/450 V +4 KV/-1.3 kV +400 V Use Voltage applied to charging roller Voltage applied to developing roller Voltage applied to toner supply roller Voltage applied to transfer roller Voltage applied to cleaning roller Variable Remarks

(3) Photosensor

The photosensor mounted on this power/sensor board supervises the paper running state during printing. Figure 2-3 shows the sensor layout diagram.

Sensor Inlet sensor 1

Function Detects the leading part of the paper and gives the supervision timing for switching from hopping operation to feeding operation. Supervises the paper running state and the paper size according to the paper reach time and running time. Detects the form width. Detects the leading part of the paper. Supervises the paper running state. Supervises the paper feed and size according to the time of arrival to the sensor and the time of passage of paper. Detect the end of the paper.

Sensing state ON: Paper exists. OFF: No paper exists.

Inlet sensor 2 Paper sensor

ON: A4 or larger OFF: Smaller than A4 ON: Paper exists. OFF: No paper exists. ON: Paper exists. OFF: No paper exists.

Outlet sensor

Paper end sensor

ON: Paper exists. OFF: No paper exists.

Toner low sensor

Detects the lack of toner.

ON long: Toner low exists OFF short: No Toner low exists

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Service Guide OL1200
Chapter 2 Operation Description

2.3 Relay/Driver Board (AOLC board) This board relays signals between the Control board and the Power/Sensor board and includes the registration motor and drum motor driver IC. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OL1200
Chapter 2 Operation Description

2.4 Electro-photographic Process 2.4.1 Electro-photographic process mechanism This mechanism prints image data from the control board on the paper by electro-photographic process. The Figure 2-4 shows the layout of the electro-photographic process mechanism.

(1) Image drum unit The image drum unit consists of a sensitive drum, a charger, and a developer. The unit forms a toner image on the sensitive drum, using an electrostatic latent image formed by the LED head. (2) Hopping motor This motor is a pulse motor of 48 steps/rotation that is two-phase excited by the signal from the control board. It drives the hopping roller of the first tray and the front feed roller via two one-way clutches according to the direction of rotation. (3) Registration motor This motor is a pulse motor of 48 steps/rotation that is two-phase excited by the signal from the control board. It drives the registration roller. (4) Drum motor This drum motor is a pulse motor of 48 steps/rotation that is two-phase excited by the signal from the control board and is the main motor of this mechanism. (5) LED head Image data for each dot line from the control board is received by the shift register and latch register. The 5120 LED's are driven to radiate the image data to the image drum. (6) Fuser The fuser consists of a heater, a heat roller, a thermistor and a thermostat. An AC voltage from the power supply board is applied to the heater under the control of the HEATON signal from the control board. This

AC voltage heats the heater. The control board supervises the heat roller temperature via the thermistor, and regulates the heater roller at a predetermined temperature (185 - 188C) by connecting or disconnecting the AC voltage supply to the heater. If the heater roller temperature rises abnormally, the thermostat of the heater voltage supply circuit is activated to cut the AC voltage supply forcibly.

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Service Guide OL1200
Chapter 2 Operation Description

2.4.2 Electro-photographic process The electro-photographic processing is outlined below. Figure 2-5 shows the electro-photographic printing process.

1 Charging The surface of the image drum is uniformly charged with negative charges by applying a negative voltage to the charge roller. 2 Exposure Light emitted from the LED head irradiates the negatively charged surface of the image drum. The surface potential of the irradiated part of the image drum surface is lowered, so that an electrostatic latent image associated with the print image is formed. 3 Developing and toner recovery When the negatively charged toner is brought into contact with the image drum, it is attracted to the electrostatic latent image by static electricity, making the image visible. At the same time, the residual toner on the image drum is attracted to the developing roller by static electricity. 4 Transfer When paper is placed over the image drum surface and a positive charge, opposite in polarity to the toner, is applied to the reverse side of the paper from the transfer roller, the toner is attracted by the positive charge and is transferred to the paper. As a result, the toner image formed on the image drum is transferred to the paper. 5 Temporary cleaning Residual toner that remains on the image drum without being transferred is made uniform by the cleaning roller and is temporarily attracted to the cleaning roller by static electricity.

6 Fusing The toner image transferred to the paper is fused under heat and pressure. Figure 2-6 shows an electro-photographic process timing chart.

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Service Guide OL1200
Chapter 2 Operation Description

2.4.3 Process operation descriptions (1) Hopping Hopping from the first tray and the front feeder are effected by a single hopping motor in the mechanism shown below.

Turning the Hopping motor in the a direction drives the hopping roller of the first tray. Turning the Hopping motor in the b direction drives the Hopping roller of the front feeder. The both and hopping gears contain one-way bearing, so that turning each of these gears in reverse direction will not be transmitted to the corresponding roller.

(a) Hopping (1st tray) 1 Rotating the pulse motor in the direction a (Clock-wise direction) drives the hopping roller of the first tray to advance the paper until the inlet sensor turns on. At the same time, the one-way clutch gear B also rotates. However, the hopping roller of the front feeder will not rotate due to the one-way bearing. 2 After turning on the inlet sensor, the paper advances further by a predetermined length until it hits the

registration roller. (The skew of the paper can thus be corrected.)

(b) Hopping (front feeder) 1 Rotating the pulse motor in the direction b (Counter Clock-wise direction) drives the hopping roller of the front feeder to advance the paper until the inlet sensor turns on. At the same time, the one-way clutch gear A also rotates. However, the hopping roller of the 1st tray will not rotate due to the one-way bearing. A cam to push down the front feeder plate is attached on each of the ends of the hopping roller shaft. These cams push down the front feeder plate when the hopping operation is not performed so as to facilitate the setting of paper into the tray. A microswitch is provided under the front feeder plate to detect that the front feeder plate is at the lower position. When the front feeder plate is at the lower position, this microswitch causes the motor to stop.

2 After turning on the inlet sensor, the paper advances further by a predetermined length until it hits the registration roller. (The skew of the paper can thus be corrected.)

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Service Guide OL1200
Chapter 2 Operation Description

(2) Feeding After the end of hopping, the pulse motor drives the registration roller. The registration roller advances the paper until it comes out of the registration roller. When leading edge of the paper causes the paper sensor to turn on, the printing is started synchronously.

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Service Guide OL1200
Chapter 2 Operation Description

(3) Charging Charging is effected by applying a DC minus voltage to the charge roller that is in contact with the image drum surface.

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Service Guide OL1200
Chapter 2 Operation Description

(4) Exposure Light emitted from the LED head irradiates the image drum surface with negative charges. The surface potential of the irradiated part of the image drum drops, thereby forming an electrostatic latent image associated with the image signal.

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Service Guide OL1200
Chapter 2 Operation Description

(5) Developing Toner is attracted to the electrostatic latent image on the image drum surface to convert it into a visible toner image. Developing takes place at the contact between the image drum and the developing roller. 1. As the toner supply roller rotates while rubbing on the developing roller, a friction charge is generated between the developing roller and the toner, allowing the toner to be attracted to the developing roller. (The developing roller surface is charged positive and the toner, negative.)

2. The toner attracted to the developing roller is scraped off by the doctor blade, forming a thin coat of toner on the developing roller surface. 3. Toner is attracted to the exposed part (low-potential part) of the image drum at the contact between the image drum and the developing roller, making the electrostatic latent image visible. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OL1200
Chapter 2 Operation Description

(6) Transfer The transfer roller is composed of conductive sponge material and is designed to make the image drum surface and the paper closely into contact. Paper is placed over the image drum surface, and a positive charge, opposite in polarity to the toner, is applied to the paper from its reverse side. The application of a high positive voltage from the power supply to the transfer roller causes the positive charge induced to the transfer roller surface to be transferred to the paper at the contact between the transfer roller and the paper. As a results, toner charged negative that is attracted to the image drum surface is transferred to the upper side of the paper by the positive charge on the lower side of the paper.

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Service Guide OL1200
Chapter 2 Operation Description

(7) Fusing After the end of the transfer, the unfused toner image is fused on the paper under heat and pressure as it passes between the heater roller and the back-up roller. The heater roller with a Teflon coating incorporates a 400W heater (Halogen lamp), which heats the heat roller. A thermistor which is in contact with the heater roller regulates the heater roller at a predetermined temperature (about 185 ~ 188C). A safety thermostat cuts off voltage supply to the heater by opening the thermostat in the event of abnormal temperature rises. The back-up roller is held under a pressure of 2.5 kg from the pressure spring at each side.

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Service Guide OL1200
Chapter 2 Operation Description

(8) Cleaning After the end of the transfer, residual toner on the image drum is attracted to the cleaning roller temporarily by static electricity to clean the image drum surface.

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Service Guide OL1200
Chapter 2 Operation Description

(9) Cleaning of rollers The charge roller, transfer roller and cleaning roller are cleaned in the following cases: - In warming up at power-on time - In warming up after the cover is opened and closed - When the number of accumulated sheets is 10 or more and the printout operation ends Changes in bias voltage applied to each roller move adhesive toner from the roller to the image drum and return it to the developer.

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Service Guide OL1200
Chapter 2 Operation Description

2.5 Paper Jam Detection The paper jam detection function supervises the paper state at power-on time and during printing. In the event that a jam occurs, this function interrupts the printing process. If any of the following errors is presented, recovery printing will be performed by removing the jammed paper ( by opening the upper cover, removing the jammed paper and closing the upper cover). Error Paper input jam Cause of error - At power-on time, the paper is placed at the inlet sensor. - After hopping operation is attempted three times, the leading part of the paper does not reach the inlet sensor. Paper feed jam - At power-on time, the paper is placed at the paper sensor. - The leading part of the paper does not reach the paper sensor within a predetermined distance after the paper has reached the inlet sensor. - The trailing part of the paper does not pass over the paper sensor within a predetermined distance after the leading edge of the paper has passed over the paper sensor. - The leading part of paper does not reach the outlet sensor within a predetermined distance after the paper has reached the paper sensor. Paper exit jam - At power-on time, the paper is placed on the outlet sensor. - The paper does not pass over the outlet sensor within a predetermined time after the leading part of the paper has reached the outlet sensor. - The paper size check with the manual feed specified considers the reference size as free size.

Paper size error

Paper size error - The size of the paper is supervised by the inlet sensor 1. It is detected that the paper does not pass over the inlet sensor 1 within predetermined range of distance. - The inlet sensor 2 detects that the size of the loaded paper is A4 or larger, or smaller than A4. The detected paper size differs from the paper size set by command or menu. - The paper size check with the manual feed specified considers the reference size as free size.

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Service Guide OL1200
Chapter 2 Operation Description

2.6 Cover Open When the stacker cover is opened, the cover open microswitch on the power/sensor board is turned off to cut the supply of +30V to the high voltage power supply circuit. As a result, all high-voltage outputs are interrupted. At the same time, the CVOPN signal is sent to the control board to notify it of the off state of the microswitch, and the control board performs the cover open processing.

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Service Guide OL1200
Chapter 2 Operation Description

2.7 Toner Low Detection - Composition The device consists of the stirring gear which rotates at a constant rate, the stirring bar and the magnet on the stirring bar. The stirring bar rotates through the link on the protrusion in the stirring gear.

Toner Low is detected by monitoring the time interval of the encounter of the magnet set on the sensor lever and the magnet on the stirring bar. Operation during toner full state - The stirring bar rotates due to the interlocking with the stirring gear. - Even when the magnet on the stirring bar reaches the maximum height, since the other side is being dipped in the toner, the stirring bar is pushed by the stirring gear. - Operation

Operation during toner low state - When the stirring bar reaches the maximum height, since there is no resistance provided by the toner on the other side, it falls to the minimum height due to its own weight. Because of this, the time interval during which it is in encounter with the magnet of the sensor lever becomes long. By monitoring this time interval, toner low can be detected.

TONER FULL state

TONER LOW state

- When the toner low state is detected 2 times consecutively, Toner Low is established. - When the toner full state is detected 2 times consecutively, Toner Low is cancelled. - When there is no change with the toner sensor for 2 cycles (5.8 sec. x 2) or more, then the Toner Sensor Alarm is activated. - The toner sensor is not monitored while the drum motor is in halt.

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Service Guide OL1200
Chapter 2 Operation Description

2.8 Stacker-full Detection The sensor lever at the paper outlet to the stacker detects a stacker-full state (about 250 sheets) and stops printing of the ensuing pages. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OL1200
Chapter 2 Operation Description

2.9 Page Size Detection The four tab pieces are driven according to the setting position of the paper guide through the cam interlocked with the paper guide of the paper cassette. When the paper cassette is inserted into the printer, the state of the tab pieces is detected by the microswitch to recognize the paper size.

State of Microswitches SW1 0 0 0 1 1 1 1 1 SW2 1 1 0 1 0 1 1 0 SW3 1 0 1 1 1 0 0 0 SW4 1 1 1 0 1 1 0 1 Paper size Letter Executive A4 Legal 14 Legal 13 B5 A5 A6

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Service Guide OL1200
Chapter 3 Parts Replacement

3. PARTS REPLACEMENT The section explains the procedures for replacement of parts, assemblies, and units in the field. Only the removal procedures are explained here. Reverse the procedure for the installation.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.1 Precautions for Parts Replacement Always practice good Anti-Static procedures when handling equipment. (1) Before starting parts replacement, remove the AC cable and interface cable. (a) Remove the AC cable in the following procedure: i) Turn off ("o") the power switch of the printer ii) Disconnect the AC inlet plug of the AC cable from the AC receptacle. iii) Disconnect the AC cable and interface cable from the printer. (b) Reconnect the printer in the following procedure. i) Connect the AC cable and interface cable to the printer. ii) Connect the AC inlet plug to the AC receptacle. iii) Turn on ("l") the power switch of the printer.

(2) Do not try disassembly as long as the printer is operating normally. (3) Do not remove unnecessary parts: try to keep disassembly to a minimum. (4) Use specified service tools. (5) When disassembling, follow the determined sequence. Otherwise, parts may be damaged. (6) Since screws, collars and other small parts are likely to be lost, they should temporarily be attached to the original positions. (7) When handling ICs such as microprocessors, ROM and RAM, and circuit boards, always practice good anti-static procedures. (8) Do not place printed circuit boards directly on the equipment or floor.

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Service Guide OL1200
Chapter 3 Parts Replacement

[Service Tools] Table 3-1 shows the tools required for field replacement of printed circuit boards and units. Table 3-1 Service Tools

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Chapter 3 Parts Replacement

3.2 Parts Layout 1 - 4

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Service Guide OL1200
Chapter 3 Parts Replacement

Parts Layout 2 - 4

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Service Guide OL1200
Chapter 3 Parts Replacement

Parts Layout 3 - 4

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Service Guide OL1200
Chapter 3 Parts Replacement

Parts Layout 4 - 4

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3 How to Change Parts This section explains how to change parts and assemblies appearing in the disassembly diagram below.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.1 Rear cover, side cover (L) Assy, face-up stacker Assy, and I/F cover Assy. (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the interface cable 1. Remove drum/toner Assy 2A and store in black plastic bag shipped w/printer. (3) Open the face-up stacker Assy 8. Disconnect the engagement at the left and right protrusions 8A . Remove the face-up stacker Assy 8. (Flex the Assy 8 in the middle to disengage 8A from the Rear cover 0.) (4) Open the stacker cover 2 and the manual feed hopper Assy 3. Remove three screws 4. Remove the side cover (L) Assy 5. (5) Remove two screws 6. Remove the I/F cover Assy 7. (6) Remove two screws 9 and four claws A. (Use a small flat blade screw driver to "pop" claws.) Remove the rear cover 10.

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Chapter 3 Parts Replacement

3.3.2 Contact Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the side cover (L) Assy (see 3.3.1 (1) to (4)).

(3) Remove two screws 1. Remove the contact plate (cover) 2 and the contact Assy 3. Pull bottom of Assy 3 out first, then the top of Assy. Remove fan connector cables from location 4.

Caution: Be careful not to deform the electrodes of the contact Assy when removing the contact Assy.

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Chapter 3 Parts Replacement

3.3.3 DC fan motor (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the side cover (L) Assy (see 3.3.1 (1) to (4)).

(3) Unplug the connector of the DC fan motor 1 and remove the DC fan motor 1.

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Chapter 3 Parts Replacement

3.3.4 Manual feed hopper Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Open manual feed hopper Assy 1. Disengage the lower portion of this Assy. (3) Hold manual feed hopper Assy 1 vertically and remove the left and right levers 2 with a downward motion.

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Chapter 3 Parts Replacement

3.3.5 Side cover (R) (operator panel Assy) (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove interface cable 1. (3) Open stacker cover 2. Remove two screws 3. Remove I/F cover Assy 4. (4) Remove two screws 5 and flexible cable 6 (use care to not damage flexible cable). Remove operator panel Assy 7. (5) Open manual feed hopper Assy 8. Remove three screws 9 and then remove side cover (R) 10.

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Chapter 3 Parts Replacement

3.3.6 Earth plate BK (R) (AOLM-PCB, IC cover) (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove side cover (R) (see 3.3.5). (3) Remove five screws 1 and eight connectors 2. Remove AOLM-PCB 3. (4) Remove two screws 4 Remove IC card cover 5. (5) Remove four screws 6. Remove side plate (R) 7, by pulling up and out on top part of plate. (6) Remove the claws and then remove FG plate BK (R) 8.

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Chapter 3 Parts Replacement

3.3.7 Stacker cover Assy, damper arm, and washer (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the rear cover (see 3.3.1). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the side plate (R) (see 3.3.6 (1) to (5)). (5) Disconnect the backup roller release lever 1 with the protrusion on the out side surface of the right side of the stacker cover. (6) Remove screw 2 and washer 3. Remove two claws. Remove stacker cover Assy 4 (at this time, the damper arm 5 is also removed).

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Chapter 3 Parts Replacement

3.3.8 Damper (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the damper arm (see 3.3.7). (3) Remove two screws 1 and then remove two dampers 2.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.9 Stacker full sensor Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the stacker cover Assy (see 3.3.7). (3) Remove four screws 1. Remove stacker mount 2 by releasing the tabs at position 2A (4) Remove stacker full sensor Assy 3 by spreading the plastic tabs on each side of sensor Assy 3 and lifting switch from cover.

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Chapter 3 Parts Replacement

3.3.10 Cable cover (cable guides A and B) (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the stacker cover Assy (see 3.3.7 ).

(3) Remove two screws 1 release tabs at position 1A . Remove cable cover 2, cable guide A 3.

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Chapter 3 Parts Replacement

3.3.11 Eject roller Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the rear cover (se 3.3.1). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the side plate (R) (see 3.3.6 (1) to (5)). (5) Remove the stacker cover Assy (see 3.3.7). (6) Release the latch on the right side of eject roller Assy 1. Lift up and remove the eject roller Assy.

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Chapter 3 Parts Replacement

3.3.12 Paper supply guide D (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the side cover (R) (see 3.3.5). (3) Remove four screws 1. Lift up and remove front feeder roller Assy 2. (4) Lift up and remove paper supply guide D 3. (At this time, two bias rollers 4 are also removed. Be careful not to lose them.) (5) Remove bias spring 5 from the paper supply guide D 3.

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Chapter 3 Parts Replacement

3.3.13 Separator F (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the manual feed hopper Assy (see 3.3.4). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the front feeder Assy (see 3.3.12 and routing. steps (1) to (3)). Make a diagram of wire locations

(5) Remove two screws 1 and then remove the inner cover 2. At this time, the cover lock lever 3 and the torsion spring 4 are also removed. Note position of torsion spring. (6) Remove two screws 5 and then remove square-shaped connector 6. (7) Using great care, remove the connector of switch Assy 7 from square-shaped connector 6. (8) Turn idle gear 8 in the direction of arrow A until front feeder plate 9 is elevated. (9) Remove front feeder gear 10 and then remove two springs A. Be careful not to lose the springs. (10) Remove four screws B and then remove paper supply guide C. (At this time, front feeder earth plates D, G, and H are also removed.) (11) Remove front feeder plate 9 by releasing the engagement at two parts 9A . Switch Assy 7 may now be removed. (12) Pull up separator E toward you and then release two mounting posts at 15A to remove the separator. (At this time, two springs F are also removed. Be careful not to lose the springs.) (13) Release two mounts on paper supply guide C and pull out switch Assy 7 upward. During Re-assembly use great care: do not pinch, crimp, or cut wires to switch Assy 7.

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Chapter 3 Parts Replacement

3.3.14 Front feeder roller Assy (1) Turn the AC power supply switch off. Unplug the AC power cord from the outlet. (2) Remove the manual feed hopper Assy (see 3.3.4). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the front feeder roller Assy (see 3.3.12 (1) to (3). (5) Remove the paper supply guide A (see 3.3.13 (1) to (10)). (6) Remove idle gear 1 and then remove the right side front feeder cam 2, release lever (R) 3, and spring 4. (At this time, knock pin 5 and bearing F are also removed. Be careful not to lose them.) Do not mix these parts with those from the left side of Assy. (7) Pull out the front feeder 7 shaft toward the left and then remove front feeder roller Assy 8. (8) Remove knock pin 9 and then remove front feeder cam D on the left (L) side, release lever (L) A, and spring B. (At this time, the bearing C on the left (L) side is also removed.) Do not mix these parts with those from the right side of Assy.

Note

1: Hopping roller orientation when removed from shaft. 2: Be sure sensor arm swings freely after re-assembly. 3: Be sure that during re-assembly both feeder cams (2 and D) are facing the same direction.
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Chapter 3 Parts Replacement

3.3.15 Hopping motor (1) Turn the AC power switch off. Unplug the AC power cable from the outlet. (2) Remove the manual feed hopper Assy (see 3.3.4). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the front feeder Assy (see 3.3.12.(1) to (3)). (5) Remove the inner cover and square-shaped connector (see 3.3.13.(5) and (6)). (6) Remove hopping motor 1 from the square-shaped connector. (7) Remove the paper supply guide A (see 3.3.13. (7) to (10)). (8) Remove the lever (R) (see 3.3.10. (6)). (9) Remove two screws 2 and then remove side plate (R) Assy 3. (10) Remove two screws 4 and then remove hopping motor 1.

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Chapter 3 Parts Replacement

3.3.16 Front feeder paper end sensor (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the manual feed hopper Assy (see 3.3.4). (3) Remove the side cover (R) (see 3.3.5). (4) Remove the front feeder roller Assy (see 3.3.12. (1) to (3)). (5) Remove the side plate (R) Assy (see 3.3.15. (1) to (9)). (6) Remove the connector of front feeder paper end sensor 1 from the square-shaped connector. (7) Remove two screws 2 and then remove paper supply guide C (3). (8) Remove paper supply guide B (4). (9) Remove four claws and then remove front feeder paper end sensor 1. (10) Remove two screws 5 and then remove square-shaped connector 6 from paper supply guide C (3).

Note: Use great care when removing the sensor.

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3.3.17 Main chassis unit (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the rear cover (see 3.3.1). (3) Remove the contact Assy (see 3.3.2). (4) Remove the side cover (R) (see 3.3.5). (5) Remove the side plate (R) (see 3.3.6 (1) to (5)). (6) Remove the stacker cover Assy (see 3.3.7). (7) Remove the front feeder roller Assy (see 3.3.12, (1) to (3)) remove the manual feed hopper Assy. (8) Remove the earth plate (HP). (9) Lift gear (TR) 1 to unlock it. Remove gear (TR) 1 and transfer roller 2. (At this time, two bearings (TR) 3 and two transfer springs 4 are also removed.) NOTE: Do not lose bearings or springs. (10) Remove connector cover 5 in direction of arrow and then remove two connectors 6 and 7. (11) Remove the DC Fan motor. (12) Remove eight screws 10 and then remove main chassis unit A. . At this time, it is not required to

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Chapter 3 Parts Replacement

3.3.18 Registration roller (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the front feeder roller Assy (see 3.3.12. (1) to (3)). (3) Remove four screws 1. Lift and remove the registration roller Assy 2, left side first then right side. (4) Release the latch and remove registration roller gear 3 and pressure roller gear 4. (5) Remove left and right side registration roller bearing Assys 5 and then remove resist roller 6 and pressure roller 7.

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Chapter 3 Parts Replacement

3.3.19 Drum motor (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove the registration roller Assy (see 3.3.18 (1) to (3)). (4) Remove fuser Assy. (5) Release the latch of fuser pressure roller release lever 1 and pull out it toward the right. (At this time, idle gear H (2) is also removed.) (6) Remove spring 3 and then remove pressure release lever 4. Be careful, do not lose or damage spring. (7) Remove EP lock spring 5 and then remove ED lock lever 6. (8) Release two latches and remove motor Assy 7. (9) Remove two screws 8 and then remove drum motor 9 and heat sink. (10) Remove two screws 10 and then remove registration motor A.

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Chapter 3 Parts Replacement

3.3.20 Idle Gear (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove the motor Assy (see 3.3.19 (1) to (8)). (4) Remove three screws 1 and then remove motor bracket B (2). (5) Remove idler gear E (3), idle gear D (4), idle gear B (5), idle gear C (6), idle gear A (7), and two resist idle gears 8.

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Chapter 3 Parts Replacement

3.3.21 Fusing Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the side cover (L) Assy (see 3.3.1 (1) to (3)). (3) Unplug connector 1. (4) Remove four screws 2 and then remove fusing Assy 3.

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Chapter 3 Parts Replacement

3.3.22 Fuser Pressure Roller (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove the fusing Assy (see 3.3.21). (4) Remove the fuser pressure roller release lever (see 3.3.19 (5)). (5) Remove two screws 2 and release three locks on the fusing guide. Remove the fusing guide 1 by pushing it upward from the lower side. (6) Release the engagement with earth plate L (BK) 3. Lift and remove backup roller 4. (At this time, two backup roller bearings 5 and two bias springs 6 are also removed.)

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3.3.23 EP Lock Shaft (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove screw 1. Turn EP lock level (L) Assy 2 in the direction of arrow A . (4) Remove spring 3. (5) Drop EP lock shaft 4 down and turn in the direction of arrows B and remove it.

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3.3.24 Hopping roller Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Release the latch. Remove hopping roller gear 1 and bearing P 2. Then, remove idle gear HF 3. (4) Remove the left side of hopping roller shaft 4 from the groove. Pull out hopping roller shaft 4 and hopping roller Assy 5 toward the left.. (5) Release the latch and remove bearing L 6. (6) Release the latch and remove hopping roller Assy 5. (At this time, knock pin 7 is also removed. Be careful not to lose the knock pin.)

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3.3.25 Outlet sensor lever (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Press the clamp part of outlet sensor lever 1. Remove the outlet sensor lever 1 by pushing it upward from the lower side.

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3.3.26 Toner sensor lever (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Squeeze the clamp part of toner sensor lever 1 and remove the toner sensor lever 1 by pushing it upward from the lower side.

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Chapter 3 Parts Replacement

3.3.27 Paper sensor lever (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Squeeze the clamp part of the paper sensor lever 1. Remove the paper sensor lever 1 by pushing it upward from the lower side.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.28 Inlet sensor lever (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Squeeze the clamp part of two inlet sensor levers 1. Remove the inlet sensor levers 1 by pushing them downward.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.29 Insulator (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove two screws 1 and then remove inlet holder 2. At this time, remove inlet 3 from inlet holder 2. (4) Remove eight screws 4, connector 5, and two screws 6. Remove Power/sensor PCB 7 together with AOLC-PCB 8. (5) Unplug connector 9 and remove Power/sensor PCB 7. (6) Remove insulator B .

Caution: Be careful not to deform the paper end lever A.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.30 Paper end lever (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Release the lock and remove paper end lever 1.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.31 Guide rail (L) Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove the insulator (see 3.3.29). (4) Remove screw 1 and then remove base plate 2. (5) Remove two screws 3 and then remove guide rail (L) Assy 4. (6) Remove cassette lock spring 5 and then remove bias link 6 and pull block 7. (Pay attention the direction of hook of cassette lock spring 5.) (7) Remove spring 8 and then remove cassette stopper 9. (8) Remove screw 10 from bias link 6 and then remove link support A.

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Service Guide OL1200
Chapter 3 Parts Replacement

3.3.32 Guide rail (R) Assy (1) Turn the AC power switch off. Unplug the AC power cord from the outlet. (2) Remove the main chassis unit (see 3.3.17). (3) Remove the insulator (see 3.3.29). (4) Remove screw 1 and then remove base plate 2. (5) Remove two screws 3 and then remove guide rail (R) Assy 4. (6) Remove cassette lock spring 5 and then remove bias link 6 and pull block 7 (At this time, earth plate 8 is also removed.) (Pay attention the direction of hook of cassette lock spring 5.) (7) Remove spring 9 and then remove cassette stopper 10. (8) Remove screw A and then remove detector spring B. (9) Remove screw C and then remove AOLS-PCB D. (10) Remove screws E from bias link 6 and then remove link support F. (11) Remove two screws G and then remove square cord from square-shaped connector H. (12) Using great care, remove connector cord I from square-shaped connector H.

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Service Guide OL1200
Chapter 3 Parts