4-41
BJC-4400
Part 4: Technical Reference
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.
Figure 4-30 Motor-Driving Circuit
Carriage Motor
Carriage Motor
Driver
Vcc
INA
IOA
IIA
VsA
VrefA
LG
C/R
VrefB
VsB
IIB
IOB
INB
Vcc
NC
VssA
Out1
NC
RsA
NC
Out2
Out3
NC
RsB
NC
Out4
VssB
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
IC13
J4
1
2
3
4
A
A
B
B
RA3
10K,1/8W
+5V
+5V
+5V
Q13
FA1L4M
LFVREF
R73
360,1/10W
R72
10K,1/16W
C60
0.1
µ
,25W
C203
0.1
µ
,50W
C202
100
µ
,35W
02DZ2.0Z
ZD19
LFA
LF10A
LF11A
LF10B
VM
LF11B
LFB
02DZ3.0Z
ZD18
C61
4700p,50V
VM-G
0.51,1/4W
R70
0.51,1/4W
R71
4
3
1
2
5
6
7
8
N1608Z300T01
N1608Z300T01
1
2
3
FB102
FB101
1
2
3
Vcc
INA
IOA
IIA
VsA
VrefA
LG
C/R
VrefB
VsB
IIB
IOB
INB
Vcc
NC
VssA
Out1
NC
RsA
NC
Out2
Out3
NC
RsB
NC
Out4
VssB
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J3
1
3
RA4
10K,1/8W
+5V
+5V
+5V
Q14
FA1L4M
CRVREF
R77
360,1/10W
R76
10K,1/16W
C62
0.1
µ
,25W
C206
0.1
µ
,50W
C205
100
µ
,35W
02DZ2.0Z
ZD21
CRA
CR10A
CR11A
CR10B
VM
CR11B
CRB
02DZ3.0Z
ZD20
C63
4700p,50V
VM-G
0.51,1/4W
R74
0.51,1/4W
R75
1
2
4
3
5
6
7
8
A
B
A
B
2
4
IC12
Approx.6
Ω
/
phase
Approx.6
Ω
/
phase
Paper Feed
Motor Driver
Paper Feed
Motor
