Principles Of Operation; Overview - OKIDATA OL830 Service Manual

Page: 14
Service Guide OL830
Chapter 2 Principles of Operation

2.1 OVERVIEW

2.1.01 Outline of Printer Operation
The primary control boards of the printer are the Engine Controller Board (LLAB-2) and the Main
Controller Board (APSM). The Engine Controller Board controls the printer mechanism and drives
the LED head. The Main Controller Board receives data from the host device, analyzes
commands, and processes the data for printing.
The APSM PCB is connected to the host system through a Centronics parallel interface, RS-232C
serial interface or an AppleTalk/RS422 interface. Interface selection is accomplished through
menu settings. The Main Controller Board receives print data and command strings from the host
system, and generates bit image data. When one page of print data is ready, the Main Controller
Board turns on the PRINT-N signal which is one of the video interface signals. Upon receipt of the
PRINT-N signal, the Engine Controller Board turns ON the main motor, resist motor, and fuser in
preparation for printing. The Engine Controller Board then sends the FSYNC-N and LSYNC-N
signals to the Main Controller Board.
Once the Main Controller Board receives the FSYNC-N and LSYNC-N signals, the WDATA-N
signal (image data signal) is sent to the Engine Controller Board in synchronization with the
WCLK-N signal. The Engine Controller Board turns ON the appropriate LEDs in conformance with
the WDATA-N signal.
In addition to the above, the Engine Controller Board controls the paper feed, paper transport, and
electrostatic processing actions necessary for printing.
The Operation Panel is connected to the Main Controller Board via the LLCC PCB and the Engine
Controller Board. The Operation Panel is controlled by the Main Controller Board.
The Main Controller Board contains 2 Mbytes of dynamic RAM. The Expansion Memory Board
(REXM) provides an additional 2 Mbytes of dynamic RAM.
An optional font card can also be installed. Each font card contains ROM which provides
additional fonts. The font card connects directly to the Main Controller Board.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)