Okidata OKIPAGE 16n Service Manual

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Service Guide OKIPAGE16n

Chapter 0 About This Manual

OKIPAGE 16n

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.

Table of Contents Page

Service Guide OKIPAGE16n

0 About This Manual

Front Cover 1

1 Configuration

1.1 System Configuration 2

1.2 Printer Configuration 3

1.3 Optional Configuration 4

1.4 Specification 5

1.5 Safety Standards 6

....1.5.2 Warning Label 7

2 Operation Description

2. OPERATION DESCRIPTION 8

2.1 Main Control Board (BOARD-COM) 9

2.2 Power Supply Board 10

2.3 Relay/Driver Board (AOLC board) 11

2.4 Electrophotographic Process 12

....2.4.1 Electrophotographic process mechanism 13

....2.4.2 Electrophotographic process 14

....2.4.3 Process operation descriptions 15

2.5 Paper Jam Detection 16

2.6 Cover Open 17

2.7 Toner Low Detection 18

2.8 Stacker-full Detection 19

2.9 Page Size Detection 20

2.10 PostScript Board (BOARD-PSBA) Optional 21

3 Parts Replacement

3. PARTS REPLACEMENT 22

3.1 Precautions for Parts Replacement 23

3.2 Parts Layout 24

3.3 How to Change Parts 25

....3.3.1 Rear cover, side cover (L) Assembly, face-up stacker

Assembly, and I/F cover Assembly.

....3.3.2 Contact Assembly 27

....3.3.3 DC fan motor 28

....3.3.4 Manual feed hopper Assembly 29

....3.3.5 Side cover (R) (operator panel Assembly) 30

....3.3.6 Earth plate BK (R) (BOARD-PSBA, BOARD-COM) 31

....3.3.7 Stacker cover Assembly, damper arm, and washer 32

....3.3.8 Damper 33

....3.3.9 Stacker full sensor Assembly 34

....3.3.10 Cable cover (cable guides A and B) 35

....3.3.11 Eject roller Assembly 36

....3.3.12 Paper supply guide D 37

Table of Contents Page

....3.3.13 Separator F 38

....3.3.14 Front feeder roller Assy 39

....3.3.15 Hopping motor 40

....3.3.16 Front feeder paper end sensor 41

....3.3.17 Main chassis unit 42

....3.3.18 Registration roller 43

....3.3.19 Drum motor 44

....3.3.20 Idle gear 45

....3.3.21 Fusing Assembly 46

....3.3.22 Fuser pressure roller 47

....3.3.23 EP lock shaft 48

....3.3.24 Hopping roller Assembly 49

....3.3.25 Outlet sensor lever 50

....3.3.26 Toner sensor lever 51

....3.2.27 Paper sensor lever 52

....3.3.28 Inlet sensor lever 53

....3.3.29 Power Supply Board / Insulator 54

....3.3.30 Paper end lever 55

....3.3.31 Guide rail (L) Assembly 56

....3.3.32 Guide rail (R) Assembly 57

....3.3.33 Cover Frame 58

....3.3.34 LED head 59

....3.3.35 Separator Assembly 60

....3.3.36 Transfer roller 61

4 Adjustment

4. ADJUSTMENT 62

4.1 Maintenance Modes And Functions 63

....4.1.1 User maintenance mode 64

....4.1.1 User maintenance mode menu system 65

....4.1.2 System maintenance mode 66

....4.1.3 Engine maintenance mode 67

....4.1.4 EEPROM initialization 68

4.2 Adjustment When Replacing A Part 69

....4.2.1 Setting of LED head drive time 70

....4.2.2 Resetting the fuser counter 71

....4.2.3 Destination setting 72

5 Periodical Maintenance

5.1 Periodic Part Replacement 73

5.2 Cleaning 74

....5.2.1 Cleaning of LED lens array 75

6 Troubleshooting Procedures

6.1 Troubleshooting Tips 76

6.2 Points to Check before Correcting Image Problems 77

6.3 Tips for Correcting Image Problems 78

Table of Contents Page

6.4 Preparation for Troubleshooting 79

....Operator Panel Display 80

6.5 Troubleshooting Flow 81

....6.5.1 LCD Status Message/Trouble List 82

....6.5.2 LCD message troubleshooting 83

........1 The printer does not work normally after being turned

on.

........2 [JAM error] 85

............2-1 Paper input jam (1st tray) 86

............2 - 2 Paper input jam (front feeder) 87

............2 - 3 Paper feed jam 88

............2-4 Paper exit jam 89

........3 Paper size error 90

........4 Fuser unit error (ERROR 71), (ERROR 72), (ERROR

73)

........5 I/F time-out between printer and optional tray (ERROR

81)

........6 I/F time-out occurs between the printer and the operator

panel (ERROR 80) .

........7 Communication with the host cannot be performed via

the parallel interface

........8 Data cannot be received through the OKI HSP interface 95

........9 Synchronous serial I/O error (ERROR 74) 96

....6.5.3 Image troubleshooting 97

........1 Image are light or blurred 98

........2 Dark background density 99

........3 Black paper is output 100

........4 Black belts or stripes in the vertical direction 101

........5 Cyclic error 102

........6 Print voids 103

........7 Poor fusing 104

........8 White belts or streaks in the vertical direction 105

........9 Snowy print of high density pattern 106

........10 Blotchy faded print 107

7 Wiring Diagram

7.1 Interconnect Signal Diagram 108

7.2 PCB Layout 109

7.3 Resistance Check 110 Program/Font ROM Location 111

8 Parts List

8. PARTS LIST 112 Printer Unit (Figure 8-1) 113 Main Chassis Unit (Figure 8-2) 1 of 2 114 Main Chassis Unit (Figure 8-2) 2 of 2 115

91 92 93 94

Table of Contents Page

Front Feeder Unit (Figure 8-3) 116 Base Unit (Figure 8-4) 117

A Centronics Parallel Interface

Appendix A: Centronics Parallel Interface 118

B High Capacity Second Paper Feeder

Preface 119

1. Outline 120

....1.1 Functions 121

....1.2 External View and Component Names 122

2. Mechanism Description 123

....2.1 General Mechanism 124

....2.2 Hopper Mechanism 125

3. Parts Replacement 126

....3.1 Precautions Concerning Parts Replacement 127

....3.2 Parts Layout 128

....3.3 Parts Replacement Methods 129

........3.3.1 Idle rollers 130

........3.3.2 AOLT-PCB 131

........3.3.3 Hopping motor 132

........3.3.4 Feed roller 133

........3.3.5 Hopping roller rubber 134

........3.3.6 Side frame (L) assy 135

........3.3.7 Side frame (R) assy 136

....4. TROUBLESHOOTING 137

........4.1 Precautions Prior to the Troubleshooting 138

........4.2 Preparations for the Troubleshooting 139

........4.3 Troubleshooting Method 140

............4.3.1 LCD Status Message List 141

............4.3.2 Troubleshooting Flow 142

....5. Connect Diagram 143

........5.1 Interconnection Diagram 144

........5.2 PCB Layout 145

....6. Parts List 146

C Multi Feeder Maintenance

Preface 147

1. Outline 148

....1.1 Functions 149

....1.2 External View and Component Names 150

2. Mechanism Description 151

....2.1 General Mechanism 152

....2.2 Hopper Mechanism 153

3. Parts Replacement 154

....3.1 Precautions Concerning Parts Replacement 155

....3.2 Parts Layout 156

Table of Contents Page

....3.3 Parts Replacement Methods 157

........3.3.1 Separator 158

........3.3.2 AOLE-PCB 159

........3.3.3 Square-shaped connector 160

........3.3.4 Hopping Motor 161

........3.3.5 Planet gear 162

........3.3.6 Roller B 163

........3.3.7 Roller A 164

........3.3.8 Mini pitch belt & Feed roller 165

4. Troubleshooting 166

....4.1 Precautions Prior to Troubleshooting 167

....4.2 Preparations for Troubleshooting 168

....4.3 Troubleshooting Method 169

........4.3.1 LCD Status Message List 170

........4.3.2 Troubleshooting Flow 171

5. Connection Diagram 172

....5.1 Interconnection Diagram 173

5.2 PCB Layout 174

6. Parts List 175

D Localtalk Serial Interface (OKIPAGE16n/PS Only)

Localtalk Serial Interface (OKIPAGE 16n/PS Only) 176

Service Guide OKIPAGE16n

Chapter 1 Configuration

1.1 System Configuration

OKIPAGE16n / OKIPAGE16n/PS consists of control and engine blocks as the standard configuration (See Figure 1-1.)

In addition, the following options are also available.

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Figure 1-1

Service Guide OKIPAGE16n

Chapter 1 Configuration

1.2 Printer Configuration

The printer unit consists of the following hardware components:

Electrophotographic processor



Paper feeder



Controller



Operator panel



Power Supply board



Figure 1-2 shows the printer unit configuration.

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Figure 1-2

Service Guide OKIPAGE16n

Chapter 1 Configuration

1.3 Optional Configuration

The options below are available for use with OKIPAGE16n / OKIPAGE16n/PS. They are sold separately from the printer unit.

(1) Multi-Purpose Feeder

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(2) High Capacity Second Paper Feeder

(3) RAM module (72 pin SIMM, 1 MB/2 MB/4 MB/8 MB/16 MB/32 MB)

16 MB RAM module



8 MB RAM module



Service Guide OKIPAGE16n

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 <Type>

Standard paper



- Xerox 4200 (20 lbs)

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Chapter 1 Configuration

Application paper (manual face-up feed)



- Label

- Envelope

- OHP paper (Transparency)

<Size>

Standard sizes



- Letter

- Legal

- Executive

- Envelope

- A4

- A5

- B5

- A6

Applicable sizes



- Width: 3.4" to 8.5" (86 to 216 mm)

- Length: 5.5" to 14" (140 to 355.6 mm) <Thickness>

- Automatic feed: 16 to 28 lbs (60 to 105 g/m 2 )

- Manual feed: Label, OHP paper (transparency) Envelope

(6) Printing speed First print: 10 sec. Continuous print: 16 sheets/min. Warm-up time: 90 sec. [at room temperature 77°F

(25°C) 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%

230/240 VAC + 10%, -14%

(11) Power consumption Peak: Approx. 600W

Typical Operation: Approx. 220W Idle: Approx. 100W Power save mode: Approx. 20W

(12) Temperature and humidity

In operation Power off mode During Storage Unit

Temperature 50 - 90

(10 - 32) Humidity 20 - 80 10 - 90 10 - 90 %RH Maximum wet bulb temperature Minimum difference of wet and dry bulb temperature

(25)

35.6

(2)

32 - 110 (0 - 43)

80.4 (26.8)

35.6 (2)

14 - 110 (-10 - 43)

______ Degree F ______ Degree F

Degree F Degree C

Degree C Degree C

Temperature 50 - 90 32 - 110 14 - 110 °F In operation Power off mode During Storage Unit Maximum wet bulb temperature Minimum difference of wet and dry bulb temperatures Humidity

35.6 35.6 °F 77 80.4 °F (10 - 32) (0 - 43) (–10 - 43) (°C) 20 - 80 10 - 90 10 - 90 %RH (25) (26.8) (°C) (2) (2) (°C)

Notes:

1. Storage conditions specified above apply to printers in packed condition.

2. Temperature and humidity must be in the range where no condensation occurs.

(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) 18,000 (3 page/job) 11,000 (1 page/job)

Service Guide OKIPAGE16n

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 OKIPAGE16n

Chapter 1 Configuration

1.5.2 Warning Label

The warning label is affixed to the portion which may cause bodily injury. Follow the instructions on warning labels during maintenance.

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Service Guide OKIPAGE16n

Chapter 2 Operation Description

2. OPERATION DESCRIPTION

OKIPAGE16n / OKIPAGE16n/PS consists of a main control board, a power supply board, a driver board, an operator panel and an electrophotographic process mechanism.

The control board receives data through a host I/F, decodes and edits the data, and stores the edited data in 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 the LED head in units of one dot line.

The electrophotographic process mechanism prints data on paper. The operator panel is used for operations and status display. Fig. 2-1 shows an OKIPAGE16n / OKIPAGE16n/PS block diagram.

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Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.1 Main Control Board (BOARD-COM)

The control board consists of an one chip CPU, LSIs, program/font ROM's, DRAM's, 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, 32-MHz clock)

that incorporates an RISC CPU and its peripheral devices, and has the following functions.

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Built-in device

Chip select controller Bus controller DRAM controller DRAM controller Transfer of image data from DRAM to OST LSI Parallel interface controller Control of Centronics parallel interface Timer Generation of various control timing

Serial I/O port Control of operator panel, EEPROM, and options I/O port Inputting/outputting of sensor, signal and motor signal Option I/O interface Control of OKI HSP interface

(2) Program/font ROM's The program/font ROM's store the HP IV emulation program and various types of font. MASK ROM is

used as the program/font ROM's. (3) DRAM's

2-Megabyte DRAM (4 Mbit DRAM x 4) is mounted as resident memory to be used for storing the program and providing various buffers. This DRAM is expandable up to 66 Mbytes by adding expansion memory (SIMMs). This DRAM provides the areas shown in the following table.

Control of ROM, DRAM and I/O device

Monitoring of paper running and paper size

Function

Memory area

System area Working area used for the program Fixed Fixed Raster buffer Stores converted bit image data Enable Expandable Receive buffer Stores temporarily the data

Page buffer Adds print information to the

DLL/macro buffer Stores soft fonts and macro data. - Expandable

Use MENU Memory capacity setting

Expansion RAM

Enable Expandable

received from the host interface

- Expandable analyzed receive data and stores the resulted data.

Font cache buffer Stores bit map fonts generated by

Enable Expandable the font rasterizer based on scalable font information

(4) EEPROM The EEPROM has a 1-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 (MBCE31701-040FP-BND) This LSI is used as a peripheral device of the CPU and performs smoothing compensation

(OST) of print image data. In addition, it transfers serially bit image data for each dot line to the LED head.

(6) Host interface This printer has the following interfaces to the host.

Centronics bi-directional parallel interface



OKI HSP interface (Option)



LocalTalk interface (Option - PostScript Version)



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 bi-directional parallel interface This is an interface conforming to IEEE-1284 and provides either of unidirectional and

bi-directional 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 bi-directional operation in combination with the compatibility mode.

ECP mode



This mode provides the asynchronous bi-directional 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 A) (b) OKI HSP interface (Option) This interface (slot) is an OKI unique universal interface that provides the platform to

connect various boards (such as the LAN connection expansion board and SCSI expansion board).

Any expansion boards compatible with this interface can be mounted on the Control board in the piggyback board without modifying the program at the printer side. The conceptual diagram of the OKI HSP interface is shown in Fig. 2-2.

(7) RAM module

Pin layout



Basic specification



- Type: 72 pins SIMM (32 bits buss width)

- Access time: 60ns, 70ns, 80ns, 100ns

- Capacity: 1, 2, 4, 8, 16 or 32MB

- Parity: None

Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.2 Power Supply Board

The power supply 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.

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Output voltage +5 V Logic circuit supply voltage +30 V Motor and fan drive voltage and source voltage for high-voltage supply +8 V Reset circuit

-8 V Local Talk Line voltage (2) High voltage power supply circuit This circuit generates the following voltages necessary for electrophotographic 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 -1.30 KV Voltage applied to charging roller DB -240 V/+300 V Voltage applied to developing roller SB -360 V/450 V Voltage applied to toner supply roller TR +4 KV/-1.3 kV Voltage applied to transfer roller Variable CB +400 V Voltage applied to cleaning roller

(3) Photosensor The photosensor mounted on this power supply board supervises the paper running state

during printing.

Use

Voltage Use Remarks Remarks

Sensor Function Sensing state

Inlet sensor 1 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.

Inlet sensor 2 Detects the form width. ON: A4 or larger Paper sensor Detects the leading part of the paper.

Supervises the paper running state.

Outlet sensor Supervises the paper feed and size according to

the time of arrival to the sensor and the time of passage of paper.

Paper end sensor Detect the end of the paper. ON: Paper exists. Toner low sensor Detects the lack of toner. ON long: Toner low exists

ON: Paper exists. OFF: No paper exists.

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

OFF: No paper exists. OFF short: No Toner low exists

Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.3 Relay/Driver Board (AOLC board)

This board relays signals between the Control board and the Power supply board and includes the registration motor and drum motor driver IC.

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2.4 Electrophotographic Process

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Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.4.1 Electrophotographic process mechanism

2.4.2 Electrophotographic process

2.4.3 Process operation description

(see

Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.4.1 Electrophotographic process mechanism

This mechanism prints image data from the control board on the paper by electrophotographic process.

The Figure 2-4 shows the layout of the electrophotographic process mechanism.

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(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 a 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 4992 LEDs 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 ~ 188°C) 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 immediately.

Service Guide OKIPAGE16n

Chapter 2 Operation Description

2.4.2 Electrophotographic process

The electrophotographic processing is outlined below. Figure 2-5 shows the electrophotographic 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

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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 electrophotographic process timing chart.

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Okidata OKIPAGE 16n Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual