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Part 4: Technical Reference
7) Multiplexer (U3)
Triple 2-channel Analog Multiplexer. It has three identical circuits which select and
output either one of the 2 analog inputs made by the MUXSEL output from the MPU
& printer controller.
When MUXSEL is "Low," inputs "X0, Y0, Z0" are selected; and when MUXSEL is
"High," inputs "X1, Y1, Z1" are selected. These inputs are then output to AN0, AN1,
and AN2 respectively.
X0: Auto-alignment sensor on the carriage
X1: Thermistor on the logic board
Y0: Head temperature sensor in the RIGHT BJ cartridge
Y1: Rank resistor in the RIGHT BJ cartridge
Z0: Head temperature sensor in the LEFT BJ cartridge
Z1: Rank resistor in the LEFT BJ cartridge
8) Paper feed motor driver (U9)
Controlled by the MPU & printer controller, the paper feed motor driver drives the
paper feed motor (controlled by the two-phase exciter) with a constant-voltage
bipolar drive. The driving IC contains two identical driving circuits.
9) Carriage motor driver (U5)
Controlled by the MPU & printer controller, the carriage motor driver drives the
carriage motor (controlled by two-phase exciter) with a constant-voltage bi-polar
drive. The peak current value is set and driven in accordance with the switching
signal from the MPU & printer controller. The driving IC contains two identical
driving circuits.
VM
C13
0.1m F,50V
F1
ICP-N25
+
C62
100m F,35V
VCC
C10
VCC
0.1m F
R93
CRAP
1K,
CRA0
1/16W,
CRA1
1%
CRBP
CRB0
CRB1
R41
1.5K,
1/16W,
C15
1%
R58
56K,
470pF
1/16W
C36
R92
56K,
470pF
1/16W
F2
Carriage Motor Driver
ICP-N25
Paper Feed
Motor Driver
VCC
C12
13
VCC
VSS
15
VREF1
0.1m F
11
VREF2
R54
LFAP
16
PHASE
1.8K,
LFA0
20
I01
1/16W,
LFA1
17
I11
1%
LFBP
10
PHASE2
LFB0
8
I02
LFB1
9
I12
R4
2K,
14
RC1
1/16W,
C65
1%
R50
470pF
56K,
1/16W
12
RC2
6
C66
GND
7
R51
GND
470pF
56K,
1/16W
Paper Feed Motor Driver
Figure 4-29 Motor-Driving Circuit
U5
CNCR
13
24
VSS
VS
J2
15
Carriage Motor
VREF1
1
11
OUT1A
CON4
VREF2
CRA+
21
1
16
OUT1B
CRA–
PHASE
2
20
2
CRB+
I01
3
OUT2A
17
I11
CRB–
4
5
OUT2B
10
PHASE2
C11
8
22
I02
9
COMP1
I12
R42
820PF
14
23
1K,1/16W
RC1
SENSE1
C14
4
COMP2
R52
820PF
3
12
1K,1/16W
RC2
SENSE2
6
19
GND
GND
7
18
GND
GND
L6219
U9
24
VS
1
OUT1A
C79
C80
C81
21
OUT1B
2
1000PF 1000PF 1000PF 1000PF
OUT2A
5
OUT2B
C63
22
R48 10HM,1/4W
COMP1
R44
820PF
23
1K, 1/16W
SENSE1
R46 10HM,1/4W
C64
4
R49 10HM,1/4W
COMP2
R45
820PF
3
1K, 1/16W
SENSE2
R47 10HM,1/4W
19
GND
18
GND
L6219
4-40
BJC-5000
APPROX.10.5 /
phase
R56 1 OHM,1/4W,1%
R53 1 OHM,1/4W,1%
R57 1 OHM,1/4W,1%
R55 1 OHM,1/4W,1%
CNLF
Paper Feed
J3
Motor
CON4
LFA+
1
LFA–
2
APPROX.
LFB+
3
2.7 /phase
LFB–
4
C82
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