Canon Color Bubble Jet BJC-4400 Series Service Reference Manual page 22

BJC-4400
3) Control/CG ROM (IC4)
The 8 M-bit control/CG ROM contains the program and bitmap font data for printer control.
4) DRAM (IC7)
Controlled by the printer controller, the 4 M-bit DRAM is used as a receive buffer, download buffer,
print buffer, and working area.
5) Reset IC (IC1)
This IC detects the power voltage when turning on the power or instantaneous power failure.
6) EEPROM (IC6)
Controlled by the printer controller, the 1 K-bit EEPROM (Electrically Erasable and Programmable
ROM) stores various function settings, the total count of printed sheets, and the total waste ink amount.
7) Carriage motor driver (IC12) / Paper feed motor driver (IC13)
The carriage motor driver which is controlled by the MPU drives both the carriage motor and the paper
feed motor which in turn are controlled by an double 1-2 phase exciter with a fixed current bipolar
drive. Upon receiving the switching signal from the MPU, the peak current value can be set
individually into 4 steps for phase A and B. By doing so, it ensures smooth operation of the motors.
+5V
RA3
10K,1/8W
LF10A
LF11A
LF10B
LF11B
VM
Paper Feed
Motor Driver
C202 C203
100µ,35W 0.1µ,50W
1
NC
VM-G 2
VssA
3
Out1
0.51,1/4W 4
NC
R70
5
RsA
6
NC
7 IC13
Out2
8
Out3
0.51,1/4W 9
NC
R71
10
RsB
11
NC
12
Out4
13
VssB
14
NC
LFA
LFB
+5V
+5V
N1608Z300T01
28
Vcc FB102
27
INA
26
IOA
25
IIA
24
VsA
23
VrefA
02DZ3.0Z
22
LG
ZD18
21
C/R
20
VrefB 2
19
VsB
18
IIB
1
17
IOB
16
INB
15 Paper Feed
Vcc
J4 Motor
1
A
2
A
Approx.6Ω/
3
B phase
4
B
Figure 4-30 Motor-Driving Circuit
+5V
RA4
10K,1/8W
CR10A
CR11A
CR10B
CR11B
Carriage Motor
VM
Driver
C205 C206 1
NC
100µ,35W 0.1µ,50W
2
VssA
3
VM-G
Out1
0.51,1/4W
4
NC
R74
5
RsA
6
NC
02DZ2.0Z IC12
7
ZD19 Out2
8
Out3
0.51,1/4W
9
NC
R75
LFVREF
10
RsB
3
11
NC
Q13
12
Out4
FA1L4M
13
VssB
14
NC
CRA
CRB
4-41
Part 4: Technical Reference
+5V
+5V
28
Vcc
27
INA
26
IOA
25
IIA
24
VsA
23
VrefA
02DZ3.0Z 02DZ2.0Z
22
LG
ZD20 ZD21
21
C/R
20
VrefB 2
19
CRVREF
VsB
18 3
IIB 1
Q14
17
IOB
FA1L4M
16
INB
15
Vcc
Carriage Motor
J3
1
A
2
A Approx.6Ω/
3 phase
B
4
B