Sharp AL-1622 (serv.man20) Service Manual ▷ View online
AL-1611/AL-1622
ELECTRICAL SECTION
13 – 14
E. RESET CIRCUIT
This circuit detects ON/OFF of power to control start/stop of each circuit. The 5V voltage and WTOVF signal of the main PWB is detected by the reset
IC to generate the reset signal.
When the power voltage reaches the specified level, the circuit operations are started. Before the power voltage falls below the specified level, the cir-
cuit operations are stopped to prevent against malfunctions.
cuit operations are stopped to prevent against malfunctions.
F. MAIN MOTOR DRIVE CIRCUIT
The main motor is driven by the MMD signal from ASIC. While the main motor is rotating, the MMD signal is driven to HIGH and passed through IC35
to the control circuit in the main motor to rotate the main motor. The /MMRDY signal is kept HIGH until the main motor speed reaches the specified
to the control circuit in the main motor to rotate the main motor. The /MMRDY signal is kept HIGH until the main motor speed reaches the specified
rpm, and passed to the CPU.
G. MIRROR MOTOR CIRCUIT
The mirror motor is a stepping motor, and it uses the IC29 and the constant current chopper control IC (SLA7027). For control, the CPU outputs the
drive signal to the IC29 to drive the mirror motor with 1-2 phase excitement.
IC3A
IC2
RESET
VSB
VSA
VCC
NJM2103M
74VHC09
1
/RESET
3
2
7
6
6
2
1
3
8
4
NP
C2
VCC
1
C
1
1
C
2
0
.1
C3
CPU
RES
WDTOVF
5
IC1
CPU
CPU
MM
IC31
Driver
Driver
IC32
2
18
4
96
97 /MMRDY#
MMD
14
/MMRDY
/MMD
IC5
ASIC
ASIC
MIRROR
MOTOR
MOTOR
MMCC12
MMCC01
29
31
30
28
IC31
+
IC25
SLA7027MU
+
2200p
ICPN38
24V
/MMA
MMB
MMB
MMA
F6
2.4K
1.0(2W)
/MMB
4
7
/3
5
V
2.4K
2200p
1.0(2W)
4
7
0
p
4
7
0
p
6
2
0
1
00
6
2
0
4
7
K
5
1
0
4
7
K
22
/1
6
V
/MMRMO0
/MMRMO1
VCC
1
2
13
14
17
16
4
5
3
9
15
10
7
8
12
11
18
4
70
71
71
1
2
16
15
MIRMODA
MIRMODB
/MIRMODB
/MIRMODB
/MIRMODA
1
2
3
4
7
5
8
1
6
TDB
TDA
REFB
INA
RSA
INB
INA
INB
REFA
OUTB
VSB
VSA
RSB
OUTA
GA
OUTA
OUTB
GB
AL-1611/AL-1622
ELECTRICAL SECTION
13 – 15
H. TONER SUPPLY MOTOR DRIVE CIRCUIT
The IC31 is the motor control IC, which generates the pseudo AC waveform with the pulse signals (TM, TM-) outputted from ASIC, driving the toner
supply motor.
3. CCD PWB
The CCD PWB is provided with the CCD (Charge-Coupled Device), the differential amplifier which amplifies image signals, and the AD convertor
which converts the amplified image signals into digital signals.
The DC power and the pulse supply pins necessary for operating the CCD image sensor are the power source (CD pin), GND (SS pin), shift pulse
(SH pin), transfer pulse (
φ
1 pin), (
φ
2 pin), reset pulse (/RS pin), clamp pulse (/CP pin), and sampling (/SP pin).
Photo data are stored in the light receiving element at the center of the CCD by the SH signal. Even number pixel data are sent to one of the two shift
registers which are positioned at both ends of the light receiving element, and odd number pixel data are sent to the other shift register. The time
registers which are positioned at both ends of the light receiving element, and odd number pixel data are sent to the other shift register. The time
interval between inputting two SH signals is called the photo accumulation time.
The signals are transfered to the register, then to the shift register sequentially by transfer pulses
φ
1 and
φ
2 and to the floating capacitor section
where electric signals are voltage-converted. Electric charges from the even number pixel shift register and the odd number pixel shift register are
flowed to the floating capacitor section alternatively.
flowed to the floating capacitor section alternatively.
The /RS signal is the reset signal of the CCD output signal. The CCD output is expressed as electric charges equivalently accumulated in the capac-
itor. Therefore, to take the CCD output data one pixel by one pixel, one output data must be cleared after it is outputted. The /RS signal is used for
that operation.
The /SP pulse signal is the peak hold signal of the signal voltage.
The output signal from the CCD is amplified by about 4.7 times greater in the differential amplifier circuit in the CCD PWB.
Differential amplification is made for the signal output (OS) and the compensation output (DOS).
The amplified CCD signal output is sent to the clamp circuit. In the clamp circuit, the black level is clamped to 2V at the BCLK signal timing by the
analog switch. The clamped voltage is maintained for one line by the coupling capacitor. The clamped analog signal is impedance-converted and
analog switch. The clamped voltage is maintained for one line by the coupling capacitor. The clamped analog signal is impedance-converted and
inputted to the AD convertor.
The analog signal inputted to the AD convertor is converted into 8bit digital data and passed to the PCU PWB.
The machine employs the TCD1501C as the image sensor. The TCD1501C is the reduction type high sensitivity CCD linear sensor of one-output
system. 5000 pixels of 7um x 7um are arranged in line to allow scanning of A3 document at 400dpi (16 lines/mm).
24V
2
9
1
4
IC27
TA7291S
IN1
IN2
GND
6
7
7
3
8
5
5
OUT1
OUT2
V5
VCC
GND
Vref
47K
47K
+
VCC
1
0µ/
1
6
V
TM
+
IC1 CPU
DTC114EKA
4.7K(1/4W)
76/
PWOFF
PWOFF
10K
1SS133
10K
4.7K(1/4W)
47K(1/4W)
TMD
/TMD
DTC114EKA
1SS133
10 /25V
229
/TM
228
TM
/TM
TM
/PWOFF
IC13
Image
ASIC
Image
ASIC
CCD analog shift register 1
CCD analog shift register 2
Photo diode
12V
Output
Photo diode
Accumulation electrode
Shift electrode
To Shift register
Photo energy
AL-1611/AL-1622
CIRCUIT DIAGRAM
14 – 1
8
7
6
5
4
3
2
1
A
B
C
D
1
2
3
4
5
6
7
8
D
C
B
A
R005
9.1K
J
C003
100000pF
R003
1.5K
J
C005
470pF
R002
1.5J(1W)
C007
2200p
F
R001
1.5J(1W)
R008
47kJ
R006
2.4k
J
R009
47kJ
R007
2.4k
J
C008
2200p
F
C010
C011
C012
C013
C009
C014
2200pFx
6
C006
470pF
C004
0.1uF
R004
220J(1/4W)
IC
0
0
1
74HC151
D0
4
D1
3
D2
2
D3
1
D4
15
D5
14
D6
13
D7
12
A
11
B
10
C
9
G
7
W
6
Y
5
CN002-9
W2
CN002-1
3
W1
W3
CN002-1
1
CN002-7
W0(Document Si
ze
Senser
)
CN002-1
5
L1
CN002-1
7
L2
CN002-1
8
CN002-1
6
CN001-1
0
COVER
CN001-8
PAPER
R010
CN003-3
A
CN003-
4
A/
CN003-1
B
CN003-
2
B/
CN001-3
Y
CN001-2
SELB
CN001-1
SELA
CN001-2
0
MOTAN
CN001-1
8
MOTA
CN001-1
4
MOTB
SLA7027M
OUTB
11
Td
B
13
RSA
9
OUTA
1
Td
A
2
REFA
3
GA
4
IN
A
5
OUTA
8
IN
A
6
REFB
14
GB
15
OUTB
18
VSA
7
RSB
10
IN
B
16
VSB
12
IN
B
17
CN001-1
6
MOTBN
C001
47uF/35V
+
CN002-2
PSOL
/
CN002-6
CLH/
CN002-8
RSOL
/
CN001-1
9
PSOL
CN001-1
7
CL
H
CN001-1
5
RSOL
CN001-1
3
GSOL
CN001-1
1
PDOWN
CN001-7
5V1
CN001-5
LGND
CN001-6
LGND
CN001-2
2
24
V
CN001-2
4
24
V
CN001-2
1
PGND
CN001-2
3
PGND
CN002-1
CN002-3
CN002-4
CN002-5
LEDSPP
D
CN002-1
9
LGND
CN002-2
0
CN002-2
1
CN002-2
2
CN002-1
0
24V1
CN002-1
2
CN002-1
4
CN003-5
CN003-6
CN004-1
C002
10uF/16V
+
C015
C016
CN001-4
SELC
C017
2200pFx
3
D004
D006
1SS133x3
D002
D003
D007
1SS133
D001
1SS133x3
DSPF
TO 5V
1
CN001-9
5V2
C018
10uF/16V
+
IC
0
0
3
BA12003
B
COM
9
I1
1
I2
2
I3
3
I4
4
I5
5
I6
6
I7
7
GND
8
O1
16
O2
15
O3
14
O4
13
O5
12
O6
11
O7
10
CN004-2
GSOL
/
R016
10kJ
R011
D005
R012
R015
R014
R013
D008
1SS133
CN005-2
CN005-1
CN001-1
2
COVER OPEN
CN005-3
LED POWER
5V
1
24V1
5V
1
24V1
5V1
5V1
5V
1
74HC151AP
8
16
IC
0
0
2
IC
0
0
1
CN001
CN002
CN003
1
2
3
4
5
6
7
8
9
10
CL
H
PSOL
SELA
Y
LGND
5V
1
5V
2
PDOWN
GSOL
RSOL
CN004
11
13
15
17
19
21
23
12
14
16
18
20
22
24
SELB
SELC
LGND
PAPER
COVER
MOTB
MOTBN
MOTA
MOTAN
24
V
PGND
PGND
24
V
ICP0
01
ICP-N38
(PHDR-22VS)
(PHDR-24VS)
1
3
5
7
9
11
13
15
17
21
5V2
LEDSPP
D
W0
W2
W3
W1
L1
L2
LGND
LGND
2
4
6
8
10
12
14
16
18
20
22
PSOL/
5V2
CLH/
RSOL
/
24V1
24V1
24V1
COVER
PAPER
LGND
LGND
19
(PHR-2)
(PHR-6)
1
2
3
4
5
6
B
B/
A
A/
24V1
24V1
1
2
24V1
GSOL
/
5V2
Senser
MATRI
X
L
L
L
L
LL
H
L
W1
W2
W3
L
H
HH
W0
L1
L
H
H
H
H
L
L
H
HH
L
H
L2
SPF/ /RSPF
L
SELA
SELB
SELC
Y
CN001
(PHDR-24VS)
CN003
(PHR-7)
CN004
(PHR-2)
CN002
(PHDR-22VS)
PARTS VIEW
7N
.C
.
COVER OPEN
CN005
(PHR-3)
1
2
LED POWER
COVER OPEN
3
LGND
CN005
(PHR-3)
5V1
1/1
[1
4] C
IRCU
IT
DIA
G
RA
M
1. INTERFACE PW
B
AL-1611/AL-1622
CIRCUIT DIAGRAM
14 – 2
8
7
6
5
4
3
2
1
A
B
C
D
1
2
3
4
5
6
7
8
D
C
B
A
PT10
3
GP1S58V
PT10
1
GP1S58V
PT10
2
GP1S58V
PT10
5
GP1S58V
CN101-7
SGND
CN102-2
5V
C101
22000p
F
R103
240J/ 1/4W
R102
120J/ 1/4W
CN101-6
COVER
CN101-1
W0
R101
120J/ 1/4W
CN101-5
W3
CN101-4
W2
CN101-3
W1
PT10
4
GP1S58V
1
2
3
4
5
6
7
W0
5V
W1
W2
W3
COVER
SGND
CN101
(PHR-7
)
1/1
2
. S
E
NSOR P
W
B
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