Circuit Description; Outline - Oki OKIPAGE6w Troubleshooting Manual

3.

CIRCUIT DESCRIPTION

3.1

Outline

The circuit of OKIPAGE6w consists of a main control board, a main high voltage power supply
board,a syb-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
specification.
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 OKIPAGE6w 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.
(3) Raster data processing
The decompression circuit in the CPU expands the compressed data and stores the data into
the raster buffer.
(4) Raster data transfer
The LED head control circuit in the CPU sends the data stored in the raster buffer to the LED
head.
(5) High voltage control (main, sub)
The high voltage control circuit in the CPU.
The high voltage power supply board generates high voltage outputs, and have sensors, LED for
display.
The power supply unit generates +26VDC output, +5DC output.
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