File name 4wplus_tm.rar
LED Page Printer
with Component Parts List
All specifications are subject to change without notice.
1. OUTLINE... 1
2. TOOLS ... 1
3. CIRCUIT DESCRIPTION ... 2
4. TROUBLESHOOTING ... 21
5. CIRCUIT DIAGRAM ... 27
6. COMPONENT PARTS LIST
This manual has been written to provide guidance for troubleshooting of the OKIPAGE4w Plus
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 P/N M-521426 if necessary.
1. High voltage power supply board and power supply unit 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.
For troubleshooting the printer, the tools listed below may be needed in addition to general
Oscilloscope Frequency response 100 MHz or higher
Soldering iron A slender tip type, 15-20 watts
Extension code kit P/N : 40105501
3. CIRCUIT DESCRIPTION
The circuit of OKIPAGE4w Plus consists of a main control board, a high voltage power supply
board and a power supply unit. The block diagram is shown in Fig. 3-1. The main control board
controls the reception and transmission of data with a host I/f and processes command analysis,
bit image development, raster buffer read. It also controls the engine and high voltage outputs.
(1) Reception and transmission control
The main control board has one parallel I/F port which is compliant to the IEEE 1284
An interface task stores all data received from the host into a receive buffer first, and returns
the printer status upon request of the host.
(2) Command analysis processing
The OKIPAGE4w Plus printer has the following emulation mode.
Hiper-W: OKI original
An edit task fetches data from the receive buffer, analizes commands, and sets I/O registers.