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OKIPAGE 6e/6ex
LED Page Printer
Troubleshooting Manual
with Component Parts List
ODA/OEL/INT
Approval
All specifications are subject to change without notice.
*Times, Helvetica and Palatino are trademarks of Linotype AG and/or its subsidiaries.
ITC Avant Garde Gothic, ITC Zapf Chancery, ITC Zapf Dingbats and ITC Bookman are registered
trademarks of International Typeface Corporation.
HP and LaserJet are registered trademarks of Hewlett-Packard Company.
Diablo 630 is a registered trademark of Xerox corporation.
CONTENTS
1. OUTLINE
2. TOOLS
3. CIRCUIT DESCRIPTION
4. TROUBLESHOOTING
5. COMPONENT PARTS LIST
6. CIRCUIT DIAGRAM
1. OUTLINE
This manual has been written to provide guidance for troubleshooting of the OKIPAGE 6e Series Printer
(primarily for its printed circuit boards), on an assumption that the reader is knowledgeable of the printer.
Read the maintenance manual for this printer if necessary.
Notes:
1. The power supply board (OLER/OLHR) containing a high voltage power supply is dangerous. From the viewpoint
of the safety standards, the local repairing of a defective board is not allowed. Thus, the objects to be locally repaired
as a result of troubleshooting are switches and fuses.
2. Replacement of CPU (MHM2029K) is not recommended. If CPU is found to be defective, board replacement is
suggested.
2. TOOLS
For troubleshooting the printer, the tools listed below may be needed in addition to general maintenance
tools.
Tool Remarks
Extension cord kit P/N: 4YA4121-2028G2
Oscilloscope Frequency response 100 MHz or higher
Soldering iron A slender tip type, 15-20 watts
-1-
3. CIRCUIT DESCRIPTION
3.1 Outline
The control board controls the reception of data transferred through a host I/F and processes command
analysis, bit image development, raster buffer read. It also controls the engine and the operator panel.
Its block diagram is shown in Fig. 3-1 through 3-4.
(1) Reception control
The control board has one centronics parallel I/F port.
The parallel I/F port can specify the following item when set by the control panel:
I-PRIME: Enabled/Disabled
(2) Command analysis processing
The OKIPAGE 6e series printers have the following emulation modes.
Laser Jet Series IVP : Hewlett Packard OKIPAGE 6e/6ex
An edit task fetches data from the receive buffer, analizes commands, and reconstructs the data
in such a way that print data are aligned from up to down and from right to left; then it writes
the resultant data into a page buffer with such control data as print position coordinate, font
type, etc. added.
(3) Font Processing
When one page editing is finished, a developing task makes an engine start and fetches data
from the page buffer synchronizing with a printing operation; then it developes the fetched data
to a bit map as referring to data from a character generator, and writes the resultant data into
the raster buffer (of band buffer structure).
(4) Raster buffer read.
As controlling the engine operation, an engine task sends data from the raster buffer to the LED
head.
-2-
1MB Memory Board
(Option)
For optional
L5C-
RAM board
Program & Font
ROM Resident RAM
4MB Mask ROM 256k x 16 DRAM x 2
16 bits High Capacity
(1M Bytes) Second Paper
Multi-Purpose
DATA Feeder (Option)
Feeder (Option)
BUS
EEPROM
Centronics
parallel I/F M Drum Motor
Drum motor &
Registration motor
drive circuit
M Registration Motor
7407
1 Chip CPU
FAN Driver FAN
FAN ALM
LED Head
CH TR DB
HEAT ON
+8V -8V 0V +5V +30V
Reset
circuit
Thermistor
Power Supply LSI
Board Cover +5V
Inlet sensor 1 open
switch Charge roller
Inlet sensor 2 Transfer roller
Low voltage
generation circuit High voltage
generation Developing
circuit roller
Paper sensor
Toner supply
roller
Outlet sensor
Cleaning
roller
Paper out sensor
Heater drive
circuit Heater
AC
Toner low sensor transformer Filter circuit AC IN
Figure 3-1 OKIPAGE 6e Block Diagram
-3-
1MB Memory Board
For optional
L6A-
RAM board
16 bit
Program & Font 32 bit
ROM Resident RAM
4MB Mask ROM 1M x 16 DRAM
DATA High Capacity
16 bit (2MB) Second Paper
Multi-Purpose
BUS Feeder (Option)
Feeder (Option)
EEPROM
Centronics
parallel I/F M Drum Motor
Drum motor &
Registration motor
drive circuit
M Registration Motor
7407
1 Chip CPU
FAN Driver FAN
FAN ALM
LED Head
CH TR DB
HEAT ON
+8V -8V 0V +5V +30V
Reset
circuit
Thermistor
Power Supply LSI
Board Cover +5V
Inlet sensor 1 open
switch Charge roller
Inlet sensor 2 Transfer roller
Low voltage
generation circuit High voltage
generation Developping
circuit roller
Paper sensor
Toner supply
roller
Outlet sensor
Cleaning
roller
Paper out sensor
Heater drive
circuit Heater
AC
Toner low sensor transformer Filter circuit AC IN
Figure 3-2 OKIPAGE 6ex Block Diagram
-4-
3.2 CPU and Memory
(1) CPU (MHM2029K-002K for OKIPAGE 6e, MHM2029K-004K-29 for OKIPAGE 6ex)
CPU core RISC CPU (MIPS R3000 compatible)
CPU clock 24.576 MHz (OSC is 12.288 MHz)
(2) Program ROM
ROM capacity 4MB (32M bit mask ROM)
ROM type 32M bits (2M ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo