This manual describes the procedures for the maintenance of the C7000 Series of printers.
The document is produced for maintenance personnel use. For details on the procedures for
handling the C7000 Series of printers, see its user documentation.
Page 3
Table of ContentsPage
Service Guide - C7000 Series
Preface1
1 Specifications
1.1 System Configuration2
1.2 Printer Configuration3
1.3 Option Configuration4
1.4 Specifications5
2 Operation
2.0 Operation6
2.1 Main board (CRM PWB)7
2.2 Engine Controller Board (K71 PWB)8
2.3 Power Units9
2.4 Mechanical Processes10
....2.4.1 Electrphotographic process11
........(1) Electrophotographic processes12
........(2) Charging13
........(3) Exposure14
........(4) Developing15
........(5) Transfer16
........(6) Fusing17
........(7) Cleaning - waste toner area18
........(8) Cleaning - transfer belt19
....2.4.2 Paper running process20
........(1) Paper Feed from Tray21
........(2) Paper Feed from Multi-Purpose Tray (MT)22
........(3) Transport Belt23
........(4) Driving and Up-and-Down Movements of I/D Unit24
........(5) Fuser Unit and Paper Ejection25
........(6) Duplex Unit26
2.5 Sensor27
....2.5.1 Paper related sensors28
....2.5.2 Other sensors29
2.6 Color Misalignment Correction30
2.7 Transfer control Responds to Environmental Changes
(Room Temperature and Relative Humidities)
2.8 Paper Jam Detection32
2.9 Cover-Open33
2.10 Toner Low Detection34
2.11 Page Size Detection35
2.12 Operation at Power-on36
2.13 Color Misalignment Detection37
2.14 Version Read of Units Replaced Periodically38
2.15 Life Count for Units Replaced Periodically39
2.16 Toner Consumption Detection40
3 Disassembly
31
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Table of ContentsPage
3.0 Precaution in Replacing Parts41
3.1 Precaution in Replacing Parts42
3.2 Parts Layout43
....Top Cover Assy44
....Printer Unit45
....Cassette Guide Assy (L), (R)46
....Duplex Unit47
3.3 Replacing Parts48
....3.3.1 Top Cover49
....3.3.2 LED Assy / LED Assy Spring50
....3.3.3 Top Cover Unit51
....3.3.4 Control Panel Assy / Control Panel Bezel / LED Control
PWB / Toner Sensors / Stacker Full Sensor / Control Panel /
Control Panel Tape Harness / Eject Rollers
....3.3.5 Top Cover Handle / Top Cover Latch / Top Cover
Latch Spring
....3.3.6 Eject Guide Assy54
....3.3.7 Cassette Assy / Front Cover Assy / Front Cover Inner
Baffle
....3.3.8 Retard Pad Assy / Retard Pad Assy Spring56
........4.1.2.9 Error Messages and their Details109
....4.1.3 CRM board adjustments110
........4.1.3.1 Short plug settings111
........4.1.3.2 Printing Menu Reports112
4.2 Adjustments after Parts Replacement113
....4.2.1 Precautions in replacing engine controller board114
....4.2.2 Precautions in replacing EEPROM115
....4.2.3 EEPROM replacement after CRM board replacement116
4.3 Color Balance Adjustment117
5 Period Maintenance
5.0 Periodic Maintenance118
5.1 Parts Replaced Periodically119
5.2 Cleaning120
5.3 Cleaning LED Lens Array121
5.4 Cleaning Pickup Roller122
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Table of ContentsPage
6 Troubleshooting Procedures
6.1 Before Troubleshooting123
6.2 Checking before Troubleshooting Image Problems124
6.3 Precautions in Troubleshooting Image Problems125
6.4 Preparation for Troubleshooting126
6.5 Troubleshooting127
....6.5.1 LCD messages list128
........Table 6-1-1 Operator Alarms (1/2)129
....6.5.2 LCD Preparation for Troubleshooting130
........(1) The printer does not operate properly after power-on.131
........(2) Jams132
............(2)-1 Paper Loading Jam (1st Tray)133
............(2)-2 Paper Loading Jam (Multi-Purpose Tray)134
............(2)-3 Paper feed jam135
............(2)-4 Paper Exit Jam136
............(2)-5 Duplex Jam137
........(3) Paper Size Error138
........(4) Image Drum Unit (ID) Up-and-Down Operation Error139
........(5) Fusing Unit Error140
........(6) Motor Fan Error141
....6.5.3 Troubleshooting image problems142
........(1) Light or Faded Image on Whole Page, or Color
Misalignment on Whole Page (Figure 6-2 A)
........(2) Dirty Background (Figure 6-2 B)144
........(3) Blank Page (Figure 6-2 C)145
........(4) Vertical Belt or LIne (Black or Color Belt, or Black or
Color Line) (Figure 6-2 D)
........(5) Vertical White Belt or Line, or Uneven-Color Belt or
Line (Figure 6-2 F)
........(6) Poor Fusing (Ink spreads or peels when touched with
fingers)
........(7) Defective Image of Regular Interval (See Figure 6-2 E)149
........(8) Missing Image150
........(9) Color Misalignment151
........(10) Color Different from Original One152
........Figure 6-3153
7 Wiring Diagram
7.1 Resistance Check154
7.2 Program/Font ROM Location155
8 Parts List
Main Assembly - Figure 8-2156
Main Assembly - Table 8-1 (1/3)157
Main Assembly - Table 8-1 (2/3)158
Main Assembly - Table 8-1 (3/3)159
Top Cover Assembly - Figure 8-2160
143
146
147
148
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Table of ContentsPage
Top Cover Assembly - Table 8-2 161
Printer Unit Chassis Figure 8-3 162
Printer Unit Chassis - Table 8-3163
Paper Tray Guide - Figure 8-4164
Paper Tray Guide - Table 8-4165
Duplex Unit - Figure 8-5166
Duplex Unit - Table 8-5167
Centronics Parallel Interface168
B 2nd/3rd Tray Maintenance
1. Parts Replacement169
....1.1 Cover Idle Roller Assy170
....1.2 PCB171
....1.3 Feeder Drive Assy172
2. C7000 2nd/3rd Tray Parts List173
........Table 6-1-1 Operator Alarms (2/2)174
Page 8
Service Guide - C7000 Series
Chapter 0 Introduction
Preface
Page: 1
This manual describes the procedures for the maintenance of the C7000 Series of printers.
The document is produced for maintenance personnel use. For details on the procedures for handling the C7000 Series of printers, see its user documentation.
Notes!
The descriptions in this manual are subject to change without prior notice.l
In preparing the document, efforts have been made to ensure that the information in it is accurate. However, there may be errors in the document. Oki l
Data assumes no responsibility for any damage resulting from, or claimed to be the results of, those repairs, adjustments or modifications to the printers
which are made by users using the manual.
The parts used for the printers are electrostatic sensitive and, if handled improperly, may be damaged. It is strongly recommended that the products be l
maintained by Oki Data Authorized Repair Centers Oki Data.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 9
Service Guide - C7000 Series
Chapter 1 Specifications
1.1 System Configuration
Figure 1-1 shows the system configuration of the C7000 Series of printers.
Page: 2
Page 10
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 12
1.2 Printer Configuration
The inside of the printer is composed of the following:
Electrophotographic Processorl
Paper Pathsl
Controller Block (CU and PU)l
Operator Panell
Power Units (High Voltage Unit and Low Voltage Unit)l
Figure 1-2 shows the printer configuration.
Service Guide - C7000 Series
Chapter 1 Specifications
Page: 3
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 15
Service Guide - C7000 Series
1.3 Option Configuration
The following options are available for the C7000 Series of printers.
(1)2nd Tray / 3rd Tray
(2)Duplex Unit
Page: 4
Chapter 1 Specifications
(3)Expansion Memory
64/128/256 MB
Page 16
(4)Internal Hard Disk
(5)OkiLAN 6200e NIC
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 17
Service Guide - C7000 Series
Chapter 1 Specifications
1.4 Specifications
(1)External DimensionsHeight: 16.9 in. Width: 16.9 in. Length: 24.4 in.
(2)Weight92.5 lbs.
(3)PapersType: Ordinary paper, Transparencies
(Recommended: MLOHP01)
Size: Postal card, Legal 13" or 14", Executive, A4,
A5, B5, A6 (Only
the 1st tray and the front feeder support A6 and
postal-card
sizes.)
Weight: 1st tray 55 kg to 90 kg (64 to 105g/m 2 )
Front feeder 55 kg to 140 kg (64 to 163g/ m 2 )
(4)Print SpeedColor: 12 pages per minute (Transparency: 5 pages
per minute)
Monochrome: 20 pages per minute (Transparency:
12 pages per minute)
Postal Card, Label, Thick Paper: 8 pages per minute
(6)Power Input100VAC ±10%
(7) Power ConsumptionPeak: 1300W Normal Operation: 400W (5% duty)
Idle: 110W Power Saving Mode: 45W or less
(8)Frequency50Hz or 60Hz ±2%
(9)NoiseOperation: 54 dB (Without second tray)
Standby: 45 dB
Power Saving: 43 dB
(10)Consumable LifeToner Cartridge: 10,000 pages (5% duty) (each of Y,
M, C and K)
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Image Drum: 30,000 pages (Continuous printing)
(each of Y, M, C and K)
(11)Parts Replaced PeriodicallyFuser Unit Assy: Every 60,000 pages
Transfer Belt Assy: Equivalent of 60,000 pages (3
pages/job)
(12)Temperatures and Relative
Humidities
Temperature
Temperature conditions
FahrenheitCelsiusRemarks
Operating50 to 89.610 to 3217 to 27 Celsius (Temperatures to assure
full color print quality)
Non-operating32 to 109.40 to 43Power off
Storage (1 year max.)-14 to 109.4-10 to 43with drum and toner
Delivery (1 month max.)-20 to 122-29 to 50with drum and without toner
Delivery (1 month max.)-20 to 122-29 to 50with drum and toner
Humidity
Humidity condition
FahrenheitCelsiusRemarks
Operating20 to 802550% to 70% (for assurance of full-color
printout quality)
Non-operating10 to 9026.8Power off
Storage 10 to 9035
Delivery 10 to 9040
(13)Printer Life600,000 pages (on a A4-size basis) or five years
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 19
Service Guide - C7000 Series
Chapter 2 Operation
2.0 Operation
Page: 6
The C7000 Series of printers, tandem color electrophotographic page printers, adopt technologies such as an LED array, OPC, dry single-component
non-magnetic developing, roller transfer and heat-compression fusing. A black-writing printing method by shedding light on print areas is used.
Page 20
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 22
Service Guide - C7000 Series
Chapter 2 Operation
2.1 Main board (CRM PWB)
Figure 2-2 provides the block diagram of the main control board (CRM PWB).
Page: 7
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(1)CPU
The CPU is PowerPC750, a 64-bit bus RISC processor, which inputs an 80-MHz CLK
(=BUS CLK), and operates at 400MHz that is five times the input.
(2)
Secondary Cache SRAM
SRAM is included as secondary cache of the CPU on the board.
(3)
ROM
ROM is to be inserted into the three 168 pin DIMM slots. The slot A is for program ROM
and the slot B is for Japanese kanji fonts. The slot C is not assigned.
(4)
RAM
RAM is to be inserted into the four 168 pin DIMM slots. The DIMMs must be fitted in
descending labeled type No. order into the slots 1, 3, 2 and 4.
SDRAM DIMM Specifications:
Speed: PC100 or more
Capacity: 64/128/256 MB
Configuration: Without parity. Without ECC. SPD information is required. Number of chips
contained = 8 or 16.
(5)EEPROM
EEPROM, an 8-pin DIP package, is to be inserted into the IC socket. The EEPROM is of
16 Kbits for 3.3V power supply, and settings for controlling the controller block are stored
in it.
(6)Flash ROM
A 2-Mbyte flash ROM is surface-mounted on the CRM board. The flash ROM is
composed of four 256-k-by-16bit chips, and fonts and macros can be stored in it.
(7)Memory control LSI (CI)
A 696-pin BGA package ASIC made by NEC, which is equipped with a cooling heat sink
and mainly controls a CPU I/F, memory, video data compression and decompression,
and a PU-video I/F.
(8)Interface control LSI (C2)
A BGA package ASIC made by Toshiba, which controls a PU command I/F, operator
panel I/F, IDE I/F, Centronics I/F, USB I/F, PCI I/F, EEPROM and a SPD (SDRAM DIMM)
I/F.
(9)
IDE HDD
An IDE connector is surface-mounted on the board to which an IDE HDD assembled
Page 25
Additional Board: (connected to PCI BUS) / Ethernet Board
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 26
2.2 Engine Controller Board (K71 PWB)
Service Guide - C7000 Series
Chapter 2 Operation
Page: 8
Page 27
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The engine control block (PU) is controlled by the engine controller board (K71 PWB) which consists of a CPU (MSM66Q577), general LSI chip, flash ROM,
EEPROM, pulse motor drivers and a video memory (see Figure 2-4).
(1) CPU
This, a 16-bit CPU with an AD converter containing 126-Kbyte ROM (OKI MSM66Q577), controls the entire system.
(2) General LSI
This LSI (MG63P011-001LA), which is contained in the printer engine control block, has 4 Mbits of video memory, and functions such as controller-engine video
interfacing, LED interfacing, motor control, sensor input, video memory control, main scan color misalignment correction, skew correction and high voltage power
supply control.
(3) Flash ROM
The flash ROM (29F400-70) is of 4-Mbits, and PU programs are stored in it.
(4) EEPROM
The EEPROM (NM93C66N-NW) is of 4-Kbits, and mounted on the board with an IC socket. Correction values are stored in it.
(5) Pulse Motor Driver
The pulse motor driver (A2919SLBTR, A2918SWV) drives the eight pulse motors to revolve the EP and transport media.
(6) SRAM
This SRAM (62256LFP-7LL) is used as working memory of the CPU.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 29
Service Guide - C7000 Series
Chapter 2 Operation
2.3 Power Units
Page: 9
There are a low voltage power unit consists of an AC filter circuit, low voltage power circuit and heater driver circuit, and a high voltage power unit organizes a
high voltage power circuit.
(1) Low voltage power supply circuit.
This circuit generates the following voltages.
Output voltageUse
+3.8 VCU LSI
+3.8 VLED head
+5 VLogic circuit power supply, PU CPU
+34 VMotor, drive voltage and power supply voltage for high voltage power
supply
-12 VOP Amp, High voltage power supply
(2) High voltage power supply circuit
This circuit generates the following voltages of not less than +34V, which are required for electrophotographic process, according to control sequences from the
controller board.
OutputVoltageUseRemarks
CH-900V to 1.4KVVoltage to charging roller
DB-100 to 400V/ +300VVoltage to developing roller
SBY, M, C, and K:
Voltage to toner supply roller
-100V to -700V
TR0Kv to 7KVVoltage to transfer rollerVariable
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 30
Service Guide - C7000 Series
Chapter 2 Operation
2.4 Mechanical Processes
Figure 2-4 shows the mechanical processes of the C7000 Series of printers.
Page: 10
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 33
2.4.1 Electrphotographic process
(1) Electrophotographic processes
(2)Charging
(3)Exposure
(4)Developing
(5)Transfer
(6)Fusing
(7)Cleaning - waste toner area
(8)Cleaning - transfer belt
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 2 Operation
Page: 11
Page 34
(1) Electrophotographic processes
Service Guide - C7000 Series
Chapter 2 Operation
Page: 12
(1)
Electrophotographic processes - The following is the outline of electrophotograhic
process:
(1) Charging - DC voltage is applied to the charging roller and the surface of the OPC
drum is negatively and evenly charged.
(2) Exposure - The LED head, under image signals, emits light to the negatively charged
surface of the OPC drum. The radiated portions of the drum surface attenuate in negative
charge according to the intensity of the light and, based on the surface potentials, a latent
electrostatic image is formed on the drum surface.
(3) Development - Negatively charged toner contacts the OPC drum and by electrostatic
force adheres to the latent electrostatic image to form a clear image on the drum surface.
(4) Transfer - Placed on the surface of the OPC drum, paper is positively, or opposite to
the polarity of the toner, charged by the transfer roller on its back to transfer the toner
image to the paper.
(5) Cleaning - The cleaning blade removes residual toner from the OPC drum after the
transfer.
(6) Fusing - The toner image on the paper is fused into place through the application of
heat and pressure to it.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 35
(2) Charging
Service Guide - C7000 Series
Chapter 2 Operation
Page: 13
(2)
Charging - Negative DC voltage is applied to the charging roller contacting the surface of
the OPC drum.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 36
Service Guide - C7000 Series
Chapter 2 Operation
(3) Exposure
(3) Exposure - The negatively charged surface of the OPC drum is radiated with light from the LED head. The negative charge of the radiated portions of the drum
Page: 14
surface attenuates in response to the intensity of the light and a latent electrostatic image responsive to the potentials of the surface is formed on the drum
surface.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 37
Service Guide - C7000 Series
Chapter 2 Operation
(4) Developing
(4) Developing - By the adhesion of toner to the latent electrostatic image on the drum surface, the image is changed to an image of its toner. The development
Page: 15
is processed at the contact portion between the OPC drum and the developing roller.
(1) The sponge roller causes toner to adhere to the developing roller. The toner becomes negatively charged.
(2) The developing blade removes excess toner from the developing roller and a thin layer
of toner remains and forms on the developing roller.
(3) The toner is drawn by the latent electrostatic image at the contact portion between the
OPC drum and the developing roller. The latent electrostatic image on the drum surface is made visible with the toner.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 38
Service Guide - C7000 Series
Chapter 2 Operation
(5) Transfer
(5) Transfer - The transfer roller, which is made of conductive sponge, presses paper against the surface of the OPC drum and brings the paper into intimate
Page: 16
contact with the drum surface. The paper is placed on the drum surface, and positively (opposite to the charge of the toner) charged by the transfer roller on its
back.
Applying positive high voltage from the power supply to the transfer roller moves the positive charge induced by the transfer roller to the paper surface at the
contact portion between the transfer roller and the paper, the paper surface drawing the negatively charged toner from the drum surface.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 39
Service Guide - C7000 Series
Chapter 2 Operation
(6) Fusing
(6) Fusing - When passing through between the heat roller and the backup roller, the toner image transferred to the paper is fused into place by the application
Page: 17
of heat and pressure to it. The built-in upper and lower halogen lamps of 700 watts and 500 watts heat the Teflon coated heat roller. The fusing temperature is
controlled by the sum of the temperature detected by the thermistor moving over the heat roller surface and the temperature detected by the
thermistor moving over the backup roller surface. For safety, a thermostat is provided and, when the heat roller temperature rises by a fixed degree or more,
becomes open to cut off voltage supply to the heater. The backup roller is being pressed against the heater by the pressure springs on both sides.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 40
Service Guide - C7000 Series
Chapter 2 Operation
(7) Cleaning - waste toner area
(7) Cleaning - Non-fused, residual toner on the OPC drum is scraped with the cleaning blade and collected in the waste toner area of the toner cartridge.
Page: 18
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 41
Service Guide - C7000 Series
Chapter 2 Operation
(8) Cleaning - transfer belt
(8) Cleaning - Residual toner on the transfer belt is scraped with the cleaning blade and collected in the waste toner box of the transfer belt unit.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page: 19
Page 42
Service Guide - C7000 Series
2.4.2 Paper running process
Figure 2-5 shows the traveling of paper in the C7000 Series of printers.
Page: 20
Chapter 2 Operation
Page 43
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 44
Service Guide - C7000 Series
Chapter 2 Operation
(1) Paper Feed from Tray
Page: 21
1. The running of the feed motor in the arrow direction (a) drives the feed roller and the nudger roller. This operation feeds paper from the tray.
2. After the beginning of the paper turns the entrance cassette sensor on, the paper is advanced a fixed length. When the paper beginning reaches the
registration roller Assy (A), the feed motor stops.
3. The running of the registration motor in the arrow direction (b), which synchronizes with the above paper advance operation, drives the registration roller Assy
(B) and the electromagnetic clutch. The registration roller Assy (A) moves with the operation of the electromagnetic gear when the paper beginning touches the
registration roller Assy (A),
where the feed motor does not run. The feed roller idles via the built-in one-way clutch and the nudger roller idles because the planet gear is disengaged.
4. The registration motor transports the paper until the paper end passes through the entrance belt sensor.
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 47
Service Guide - C7000 Series
Chapter 2 Operation
(2) Paper Feed from Multi-Purpose Tray (MT)
Page: 22
1. The release lever usually pushes down the hopping plate to a position that turns microswitch on (Figure 2-7-a).
2. The running of the motor in the (a) direction drives the MT feed roller and turns the cam. The cam pushes the release lever and the hopping plate picks up
paper sent out by the MT feed roller (Figure 2-7-b), where the registration roller Assy (B) does not move because its one-way clutch gear (1) idles.
3. After the paper beginning turns the entrance sensor on, the paper is forwarded a fixed length. The paper stops when its beginning reaches the registration
roller Assy (B).
4. At the same time, the cam pushes down the hopping plate. The release lever that has been placed in its original position by the spring locks the hopping plate
(Figure 2-7-c).
5. After the completion of the paper feed operation, the registration motor runs in the arrow direction (b) to drive the registration roller Assy (B), where the
one-way clutch gear (2) does not allow the MT feed roller to move.
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 50
Service Guide - C7000 Series
Chapter 2 Operation
(3) Transport Belt
Page: 23
1. The running of the transport belt motor in the arrow direction (a) drives the transport belt. The belt unit sits with one transport roller immediately below each
color's drum, and the transport belt between them. By the application of a fixed voltage, the transport belt and the transport roller feed paper on the transport belt
into the fuser unit, transferring a toner
image on each color's drum.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 51
Service Guide - C7000 Series
Chapter 2 Operation
(4) Driving and Up-and-Down Movements of I/D Unit
Page: 24
1. The I/D unit driving and up-and-down movements are effected by a single-pulse motor. The running of the main motor in the arrow direction (a) turns the lever
1 to the left. Then, the lever 2 that was lifted by the lever 1 lowers to move down the I/D unit. After the up/ down sensor is turned off (Figure 2-9-d), specified
downward pulsing places the I/D unit
in its lowest position, or equivalently, printing position (Figures 2-9-a and 2-9-c). The drum gear engages with the driving gear and starts revolving to transfer an
image on the drum to running paper, where the one-way gear idles upon placement of the lever in its lowest position.
2. With the running of the main motor in the arrow direction (b), the lever 1 pushes up the I/ D unit via the lever 2. After the up/down sensor is activated (Figure
2-9-d), the lever 1 lifts the I/D unit to a specified level and stops to keep space to an extent between the drum and the transport belt (Figures 2-9-c and 2-9-e).
The drum gear is not engaged with the driving gear and does not revolve.
3. When the two pins of the up/down sensor are pushed up by the I/D unit, and touches and electrically connected to the plate above the pins, the sensor
recognizes the on state. When the two pins are pushed down by the I/D unit, and separated and insulated from the plate, the sensor recognizes the off state. The
installation of the I/D unit can also be verified by recognizing the off state of the up/down sensor.
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 55
Service Guide - C7000 Series
Chapter 2 Operation
(5) Fuser Unit and Paper Ejection
Page: 25
1. A single-pulse motor drives the fuser unit and the eject rollers. In response to the running of the heat motor in the arrow direction (a), the heat roller turns. This
roller fuses a toner image to paper by heat and pressure.
2. At the same time, the four eject rollers move to eject the paper.
3. The ejection path is switched back and forth between the route to the face-up stacker and the route to the face-down stacker as follows. When the face-up
stacker opens, the paper separator inclines in the direction that guides the paper to the face-up stacker. When the face-up stacker closes, the paper separator
inclines in the direction that sends the paper to the face-up stacker.
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Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 58
Service Guide - C7000 Series
Chapter 2 Operation
(6) Duplex Unit
Page: 26
1. When the duplex unit receives an instruction from the printer to print on both sides of a sheet of paper, the solenoid opens the separator after the completion of
one side printing of a sheet of paper sent from the tray. The path is switched to that to the duplex unit. At this time, as the roller (1) turns in the direction of the
arrow "a" the paper is retracted
on the rear of the cassette.
2. When fixed time has elapsed after the paper beginning passes through the duplex-in sensor, the rollers reverse and the roller (1) turns in the direction of the
arrow "b" to feed the paper into the duplex unit. After that, the paper passes through the rollers (2), (3) and (4), and ejected with the other side printed, and fed
again into the printer.
Page 59
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 60
2.5 Sensor
2.5.1 Paper related sensors
2.5.2 Other sensors
Service Guide - C7000 Series
Chapter 2 Operation
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page: 27
Page 61
2.5.1 Paper related sensors
Service Guide - C7000 Series
Chapter 2 Operation
Page: 28
SensorFunctionSensor status
Entrance MT sensor
Entrance Cassette
sensor
Entrance Belt sensorDetects the beginning of transported paper and,
Detects the beginning of incoming paper to
determine the timing for switching from hopping to
transport.
based on the time taken until the paper beginning
ON: paper is present.
OFF: Paper is absent.
ON: paper is present.
OFF: Paper is absent.
reaches the sensor, determines the paper length.
Exit sensorDetects the beginning and end of paper to determine
the paper ejection timing.
ON: paper is present.
OFF: Paper is absent.
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Duplex in sensorDetects the beginning of paper that enters into the
duplex unit, to determine the time taken until the
ON: paper is present.
OFF: Paper is absent.
reversed rollers turn in forward direction.
Duplex Rear sensorDetects the beginning of reverses paper in the
duplex unit.
Duplex Front sensorDetects the end of reversed paper in the duplex unit
to determine the paper ejection timing.
ON: paper is present.
OFF: Paper is absent.
ON: paper is present.
OFF: Paper is absent.
Stacker Full sensorDetects the face-down stacker full of paper.ON: Stacker is full.
OFF: Stacker is empty.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 63
Service Guide - C7000 Series
Chapter 2 Operation
2.5.2 Other sensors
1 Paper Empty sensor
This sensor checks whether the paper cassette is empty.
2 Paper Near sensor
This sensor checks whether the paper cassette is near empty.
3 MT Paper Empty sensor
This sensor checks whether paper exists in the front feeder.
4 MT Hopping switch
This microswitch checks whether the front feeder table is in the up position or in the down position.
5 Paper Size switch
This sensor detects the size of paper in the paper cassette.
6 ID Up/Down sensor (one for each of colors, Y, M, C and K)
This sensor checks whether the ID unit is in the up position or in the down position.
7 Toner K, Y, M and C sensors
Page: 29
These sensors checks whether the waste toner cartridges are full by measuring the time interval between regular opening movements of toner sensors’
respective levers.
8 Temperature sensor
See section 2.7 (Transfer Control Responds to Environmental Changes).
9 Humidity sensor
See section 2.7 (Transfer Control Responds to Environmental Changes).
10 OHP sensor
This sensor detects the presence or the absence of transparencies.
11 Alignment sensor
Page 64
Upon correction of color misalignment, this sensor reads the alignment pattern printed at the right and left ends of the transfer belt (see section 2.13).
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 65
Service Guide - C7000 Series
Chapter 2 Operation
2.6 Color Misalignment Correction
Page: 30
Each of the C7000 Series of printers is equipped with 4 ID units and LED heads, which can cause color misalignment. This color misalignment is automatically
corrected as follows:
(1) Color alignment to be corrected
1 Color misalignment in X-axis direction (Positional error caused by LED head)
2 Color misalignment in slanting direction (Positional error caused by LED head)
3 Color misalignment in Y-axis direction (Positional error caused by I/D unit and LED head)
(2) Correcting
A preset pattern to detect color misalignment is printed on the belt. The reflection sensor reads the printed pattern, each color's misalignment value is sensed and
its correction value is determined. The correction value is used each color's (Cyan, Magenta and Yellow) writing timing in comparison with that of Black.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 66
Service Guide - C7000 Series
Chapter 2 Operation
2.7 Transfer control Responds to Environmental Changes (Room Temperature and Relative Humidities)
Page: 31
The C7000 Series of printers measure the room temperature and the relative humidity using their room temperature sensors and humidity sensors. An optimum
transfer voltage under each measurement environment is calculated to perform real-time control on printing with its optimum voltage.
Environmental sensing table
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 67
Service Guide - C7000 Series
Chapter 2 Operation
2.8 Paper Jam Detection
Page: 32
The C7000 Series of printers detect paper jams after power-on and during printing. When a paper jam occurs, the printing operation is immediately suspended.
After the cover is opened and the jammed paper is removed, closing the cover resumes the printing.
Classification / BeltERRORError Condition
STSOP/7Paper Size ErrorThe entrance cassette sensor has not turned off
within fixed time after its turn-on. Loading of multiple
sheets of paper has been detected.
SSTOP/5
OPJAM/6
Misfeed from Duplex
Transport Assembly
Paper could not be loaded from the duplex transport
assembly.
OPFEED/4
SSTOP/5
OPJAM/6
OPFEED/3
SSTOP/5
OPJAM/6
Misfeed from
Multi-Purpose Tray
(MT)
Duplex Paper
Reversing Jam
Paper could not be loaded from the MT.
The duplex rear sensor has not turned on during the
paper reversing operation of the duplex unit.
OPFEED/2,1,0
STSOP/5
OPJAM/5
STSOP/5
OPJAM/3
STSOP/5
OPJAM/2
Duplex Unit
Entrance Paper Jam
Duplex Unit Paper
Input Jam
The duplex-in sensor has not turned on during the
paper loading in the duplex unit.
The duplex front sensor has not turned on during
the operation.
Paper Ejection JamThe paper exit sensor has not detected the end of
paper within fixed time after the detection of the
beginning of it. The paper exit sensor has not turned
off since its turn-on.
STSOP/5
OPJAM/1
STSOP/5
OPJAM/0
STSOP/4
Paper Transport JamThe paper exit sensor has not turned on while paper
is running on the belt.
Loading JamPaper has not reached the entrance belt sensor or
the MT sensor after the completion of the hopping.
MT Paper EmptyThere is no paper in the multi-purpose tray.
OPAP/3
STSOP/4
OPAP/2,1,0
Cassette 1, 2, or 3
Paper Empty
There is no paper in the cassette 1, 2, or 3.
Page 68
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 69
Service Guide - C7000 Series
Chapter 2 Operation
2.9 Cover-Open
Page: 33
When the top cover of the printer is open, the cover-open microswitch turns off to cut the high voltage power and output of not less than 32V. At the same time,
the CPU receives CVOPN signals for indicating the status of the microswitch to handle the cover-open.
When the front cover is open, the microswitch also turns off and the 32V power to the duplex unit is cut. The CPU receives FCOVER signals for indicating the
status of the microswitch to handle cover-open.
Page 70
Page 71
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 72
Service Guide - C7000 Series
Chapter 2 Operation
2.10 Toner Low Detection
Page: 34
Structurel
The toner low detection device consists of the stirring gear that revolves at a constant speed, the stirring bar, and the magnet on the stirring bar. The stirring bar
turns in synchronization with the protrusion of the stirring gear.
Detectionl
A toner low condition is detected by measuring the contact time between the sensor lever magnet and the stirring bar.
Full Toner Condition
The stirring bar rotates in symchronization with l
the stirring gear.
Even when the stirring bar magnet is placed in its l
highest position, the stirring bar turns by the force
of the stirring gear because the opposite side of
the bar is placed in toner.
Page 73
Toner Low Condition
The stirring bar reaches its highest position, then
falls to its lowest position under its own weight
because of the absence of toner resistance on
the opposite side. In this situation, the bar-magnet
contact time becomes long. By measuring the
time, a toner low condition is detected.
Page 74
When the toner low condition is detected 20 consecutive times, toner low is determined. (The toner low message is displayed when about 500 A4 sheets at l
5% density have been printed after toner low had been detected.)
When the toner full condition is detected 10 consecutive times, toner low is removed.l
When the toner sensor remains unchanged for more than 15 cycles of 2.3 seconds, the toner sensor alarm is activated.l
The toner sensor does not perform the detection while the drum motor is not running.l
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 75
Service Guide - C7000 Series
Chapter 2 Operation
2.11 Page Size Detection
Page: 35
Via the cam moves jointly with the paper guide of the paper cassette, the four tab pieces are driven according to the set position of the paper guide.
Upon installation of the paper cassette, the microswitch detects the condition of the tab pieces and the paper size is recognized.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 76
2.12 Operation at Power-on
2.12.1 Self-diagnostic test
(1) Initial test
The followings are automatically performed at power-on.
(a) ROM check
(b) RAM check
(c) EEPROM check
(d) Flash ROM check
(2) ROM check
ROM is checked by calculating a HASH value.
(3) RAM check
(a) RAMs are by type. Out-of-specification RAM is judged as an error.
(b) The order of mounted RAMs is checked. Out-of-standard order is judged as an error.
(c) Each slot's RAM is checked by read-after-write operation.
Service Guide - C7000 Series
Chapter 2 Operation
Page: 36
(4) EEPROM check
Specific data stored at a fixed address of EEPROM is checked..
(5) Flash ROM check
The flash ROM format is checked. Unformatted ROM is formatted after read-after-write checking.
(6) Option unit check
Before the printer goes into the operation mode, the presence of the option units (e.g., the HDD, NIC, option trays and duplex unit) is checked.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 77
Service Guide - C7000 Series
Chapter 2 Operation
2.13 Color Misalignment Detection
Page: 37
Reflection-type optical sensors for detecting color misalignment (Z71-PCB) are mounted on the belt at the right and left ends, respectively, in front of the toner
scraping (cleaning) blade which is at the back of the belt unit. The color misalignment detection pattern is printed on the belt at each of the right and left ends and,
by reading the patterns by the reflection-type optical sensors, the misalignment amounts are measured with respect to Black to determine correction values.
Then, the misalignment in main-scanning, sub-scanning and slanting directions is corrected. These operations are performed at power-on, at cover-close and
every 200 pages.
Page 78
Page 79
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 80
Service Guide - C7000 Series
Chapter 2 Operation
2.14 Version Read of Units Replaced Periodically
Page: 38
The version of each of the I/D, fuser unit and belt unit which are replaced periodically is determined whether it is new or previous according to whether the fuse in
it is conducting or out of conduction. When the fuse is conducting, the unit is decided that it is new. The "new" or "previous" judgment is performed at power-on
and at cover-close. The life counter of every new unit is reset and the "new" or "previous" judging purpose fuse in the unit is cut.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 81
Service Guide - C7000 Series
Chapter 2 Operation
2.15 Life Count for Units Replaced Periodically
Page: 39
The life of each of the I/D, fuse unit and belt unit which are replaced periodically is counted as shown in the following table:
Unit NameConditionAction
I/D (Image Drum
Cartridge)
The number of drum revolutions is counted, on a letter
paper length
Warning (the unit can still
be used).
+ continuous-printing paper interval basis. End of Life:
Time when a distance equivalent to pages of 20K is
printed (3P/J). Warning (the unit can still be used).
Toner CartridgeThe number of dots printed is counted. The used
amount is determined based on the counter value (See
section 2.16). End of Life: Time when toner low occurs.
Belt UnitThe number of drum revolutions is counted, on a letter
paper length
+ continuous-printing paper interval basis. The count of
one is performed every time when one page is passed.
End of Life: Time when the counter value reaches 60K.
Warning (the unit can still be used).
Fuser UnitThe count of one is performed every time when one
page is passed.
End of Life: Time when the counter value reaches 60K.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Do not use the unit
anymore.
Warning (the unit can still
be used).
Warning (the unit can still
be used).
Page 82
Service Guide - C7000 Series
Chapter 2 Operation
2.16 Toner Consumption Detection
Page: 40
The used toner amount is detected by counting the number of dots printed. The counting starts after toner low is removed. The sum of the counted values is
stored in EEPROM. Upon detection of toner low, the amount used is forcedly set to 8%. After that, when the equivalent of pages of 1K on A4 and 5% duty is
reached, toner-empty occurs and the printing stops.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 83
Service Guide - C7000 Series
Chapter 3 Disassembly
3.0 Precaution in Replacing Parts
Page: 41
This section describes the procedure for replacing the parts, assemblies and units in the field. The replacing procedure is given for detachment. To attach, use
the reverse procedure.
3.1 Precautions in Replacing Parts
3.2 Parts layout
3.3 Replacing Parts
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 84
Service Guide - C7000 Series
Chapter 3 Disassembly
3.1 Precaution in Replacing Parts
(1)Before starting parts replacement, remove the AC cable and interface cable.
(a) Removing the AC cable
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) Reconnecting the AC cable
i) Connect the AC cable and interface cable to the printer.
ii) Connect the AC inlet plug to the AC receptacle.
iii) Turn on ("I") the power switch of the printer.
Page: 42
(2)
(3)
(4)
(5)
(6)
Do not disassemble the printer, if operating normally.
Do not remove unnecessary parts: try to keep disassembly to a minimum.
Use specified service tools.
When disassembling, follow the determined sequence. Otherwise, parts may be damaged.
Since screws, collars and other small parts are likely to be lost, they should temporarily be
Page 85
(7)
attached to the original positions.
When handling ICs such as microprocessors, ROM and RAM, and circuit boards, follow
standard electrostatic procedures.
(8)
No.Service ToolsToolsQtyPlace of UseRemarks
1No. 1-100 Philips
2No. 2-200 Philips
Do not place printed circuit boards directly on the equipment or floor.
12-2.5 mm
screwdriver
screws
13-5 mm screws
screwdriver, Magnetized
3No. 3-100 screwdriver1
4No. 5-200 screwdriver1
5Digital multimeter1
6Pliers1
7Handy cleaner1
8LED Head cleaner
P/N 51802901
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
1Cleans LED
head
Page 86
3.2 Parts Layout
Service Guide - C7000 Series
Chapter 3 Disassembly
Page: 43
Page 87
Page 88
[Top Cover Assy}
[Printer Unit]
[Cassette Guide Assy (L), (R)]
[Duplex Unit]
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 89
Top Cover Assy
Service Guide - C7000 Series
Chapter 3 Disassembly
Page: 44
Page 90
Page 91
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 92
Printer Unit
[Printer Unit 1/2]
Service Guide - C7000 Series
Chapter 3 Disassembly
Page: 45
Page 93
Page 94
Printer Unit 2/2]
Page 95
Page 96
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 97
Cassette Guide Assy (L), (R)
Service Guide - C7000 Series
Chapter 3 Disassembly
Page: 46
Page 98
Page 99
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Page 100
Duplex Unit
Service Guide - C7000 Series
Chapter 3 Disassembly
Page: 47
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