Chapter 2 Basic Operation; Engine Controller - Canon BJ-W3000 Service Manual

CHAPTER 2. BASIC OPERATION
D. Engine Controller
Figure 2-105 is a block diagram of the engine controller.
The printer is controlled mainly by the CPU (U221), which is run by the 16MHz external
clock.

Engine controller

Command
communic-
ation I/F
Sub-CPU
(U202)
[10]
Paper feed
motor
driver
(U233)
Paper
feed
motor
Image data I/F (8-bit)
Image data control communication I/F
2–10
[2] [3]
DRAM
(U216)
[11]
Carriage
motor
driver
(U232)
Carriage
motor
Purge
motor
BJ cartridges
(Bk, C, M, Y)
Figure 2-105
[1]
CPU
(U221)
[4] [5]
FLASH EEPROM
ROM (U218)
(U219)
[7]
Gate
array
Data
(U208)
bus
[12]
Purge motor
driver
(U234)
Linear encoder
16MHz
Reset IC
(U227)
Address bus
Data bus
(U204)
[8]
Gate
array
(U212)
LED light
control circuit
Carriage
controller
LED
Y202
[6]
[9]
Gate
array