Service Manual
5-5
Theory of Operation
5
Engine control board block description
The engine control board receives color bitmaps from the image processor board.
It also controls the print engine's printing process, including all motors, sensors,
and the thermal head. The block diagram shown in Figure 5-2 illustrates the
functional operation of the print engine control board. The block diagram
consists of nine major functions:
■
Central processing unit (CPU)
■
Interface
■
Data controller and data buffer
■
Timing controller
■
Dot compensator
■
Head controller
■
Thermal head
■
Mechanical controller with motors, solenoids, and sensors
■
Internal test pattern generator
Figure 5-2 Print engine board block diagram
8699-09A
Thermal
head
Image
processor
Interface
buffers
Line
buffer
Heat
control
(dot compen-
sation)
Line
memory
buffer
Test
pattern
generater
CPU
Thermal head
controller
Mechanical
controller
Engine control board
Sensors
From
host
computer
Motors
Solenoids
