Sharp AL-1566 (serv.man15) Service Manual ▷ View online
AL-1556/1566 ELECTRICAL SECTION 12 - 9
(7) Toner motor control circuit
The IC32 is the motor drive IC, which generates pseudo-AC wave-
forms by the pulse signal from the ASIC to drive the toner supply
motor.
forms by the pulse signal from the ASIC to drive the toner supply
motor.
(8) Main motor control circuit/ LSU (Polygon motor)
control circuit
The motors are driven by the MMD (main motor) signal and the PMD
(polygon motor) signal from the ASIC.
(polygon motor) signal from the ASIC.
The MMD signal and the PMD signal are turned HIGH and sent
through the driver IC27 to the control circuit in the main motor/LSU,
rotating each motor.
rotating each motor.
When the motor RPM reaches the specified level, the MMLD signal
(main) and the PMLD signal (LSU) become LOW. The CPU detects it
to start process control.
(main) and the PMLD signal (LSU) become LOW. The CPU detects it
to start process control.
(9) Mirror motor control circuit, SPF motor control circuit,
Duplex motor control circuit, Shifter motor control
circuit.
circuit.
Stepping motors are employed for the mirror motor, the SPF motor,
and the duplex motor. The driver for IC29 (for the mirror motor) is the
bipolar drive constant current drive IC. The drive for IC31 (for the SPF)
is the uni-polar drive constant current drive IC. The drive for IC28 (for
the duplex) and IC30 (for the shifter) is the constant current drive IC.
and the duplex motor. The driver for IC29 (for the mirror motor) is the
bipolar drive constant current drive IC. The drive for IC31 (for the SPF)
is the uni-polar drive constant current drive IC. The drive for IC28 (for
the duplex) and IC30 (for the shifter) is the constant current drive IC.
Each motor is driven in W1-2 phase excitement, 1-2 phase excitement,
or 2-phase excitement.
or 2-phase excitement.
The mirror motor/SPF motor related to image scan are driven by a con-
stant current, and each motor current is switched in each magnification
ratio.
stant current, and each motor current is switched in each magnification
ratio.
R113
47kJ
47kJ
21
R112
47kJ
47kJ
21
C128
10u/35V
10u/35V
1
2
+
R105
1kJ
1kJ
2
1
R106
1kJ
1kJ
2
1
IC32
BA6920FP
Vcc
17
GND
8
Rin
20
Fin
18
OUT1
9
OUT2
5
VM
16
VREF
21
RNF
6
PSAVE
19
NC
1
NC
2
NC
3
NC
4
NC
7
NC
10
NC
11
NC
12
NC
13
NC
14
NC
15
NC
22
NC
23
NC
24
NC
25
FIN
FIN
C129
0.1u/50V
1
2
24V
PGND
PGND
PGND
(TM)
(TM_)
(TM_)
TMB_O
TMA_O
TMA_O
(4-D3)
(4-D3)
(4-D3)
(11-A1)
(11-A1)
(11-A1)
Tonner Motor Driver
IC27
KID65503F
1B
1
2B
2
3B
3
4B
4
5B
5
6B
6
7B
7
G
8
NC
9
1C
16
2C
15
3C
14
4C
13
5C
12
6C
11
7C
10
Q3
KRC106S
KRC106S
1
2
3
R88
10kJ
10kJ
21
5V
PMD
MM_Y2
MMD
MM_Y1
MM_Y3
/PMD
MMref1
/MMD
MMref2
MMref0
POFF
/POFF
/LEND
SHOLD
(10-B4)
(11-B2)
(11-B2)
(11-B2)
(11-A4)
(6-A3)
(6-A3)
(6-A3)
(2-C1)
(2-C1)
(2-C1)
(2-A3)
(2-C1)
(2-A3)
(1-D3)
AL-1556/1566 ELECTRICAL SECTION 12 - 10
C116
820p
820p
1
2
C117
820p
820p
1
2
C118
820p
820p
1
2
C121
0.1u
0.1u
1
2
C115
820p
820p
1
2
C119
0.1u
0.1u
1
2
R92
1.5kJ
1.5kJ
21
R90
0.68J
1W
1W
2
1
R94
30kJ
30kJ
21
R95
30kJ
30kJ
21
R91
1.5kJ
1.5kJ
21
R89
0.68J
1W
1W
2
1
R98
510J
510J
21
R97
1kJ
1kJ
21
R96
2kJ
2kJ
21
R93
1kJ
1kJ
21
IC29
L6219DS or AMM56219
OUT 2A
2
SENSE 2
3
COMP 2
4
OUT 2B
5
GND
6
GND
7
I02
8
I12
9
PHASE 2
10
VREF 2
11
RC 2
12
VSS
13
RC 1
14
VREF 1
15
PHASE 1
16
I11
17
GND
18
GND
19
I01
20
OUT 1B
21
COMP 1
22
SENSE 1
23
VS
24
OUT 1A
1
5V
24VM
5V
5V
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
MM_PH_A
OUT_A-
MM_AI0
MM_PH_B
MM_BI0
MM_BI1
MM_BI1
MM_AI1
OUT_A+
OUT_B-
MMref0
MMref1
MMref2
MMref1
MMref2
OUT_B+
(10-D2)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(2-A3)
(5-C1)
(5-C1)
(5-C1)
(5-C1)
(5-C1)
Scanner Motor Driver
(10-D2)
(10-D2)
(10-D2)
(10-D2)
(10-D2)
R107
300J
300J
21
C125 2200p
1
2
R99
7.5kJ
2
1
C126
2200p
1
2
R100 7.5kJ
2
1
C132
2200p
1
2
C136
OPEN
1
2
C130
OPEN
1
2
C127 OPEN
1
2
C137
OPEN
1
2
C135
2200p
1
2
R104 2.4kJ
2
1
R111 2.4kJ
2
1
R101
1kJ
1kJ
21
R115
1kJ
1kJ
21
C134
0.1u
1
2
R108
620J
620J
21
R109
1.2kJ
1.2kJ
21
R110
100J
100J
21
R102
750J
750J
21
R103 1J
2W
2
1
IC31
MTD1361/F
CrA
23
CrB
20
VsA
25
RsA
3
VrefA
24
VrefB
19
RsB
12
VsB
18
In /A
26
In A
27
In /B
17
In B
16
Vmm
22
OUT /A
1
OUT A
4
OUT /B
14
OUT B
11
PG
15
PG
28
R114 1J
2W
2
1
PGND
PGND
PGND
PGND
PGND
24VM
5V
SPMT_2
(SPFMT2)
SPMT_0
SPMT_3
SPMT_1
SPMT_3
SPMT_1
MRPS_1
MRPS_2
MRPS_3
MRPS_2
MRPS_3
(SPFMT0)
(SPFMT3)
(SPFMT1)
(SPFMT3)
(SPFMT1)
(5-C2)
(5-C2)
(5-C2)
(5-C2)
(5-C2)
(4-D3)
(4-D3)
(4-D3)
(4-D3)
(4-D3)
(4-D3)
(4-D3)
(11-D1)
(11-D1)
(11-D1)
(11-E1)
(11-E1)
SPF Motor Driver
D5
MTZ J22B
IC28
TD62064AF
I1
3
NC
4
NC
5
I2
6
NC
10
I3
11
NC
12
NC
13
GND
17
O1
2
O2
7
O3
9
O4
16
COM
1
COM
8
GND
18
I4
14
NC
15
PGND
24VDup
DMT0
/DMT0
DMT1
DMT2
DMT3
/DMT1
/DMT2
/DMT3
(11-B3)
(11-B3)
(11-B3)
(11-B3)
(1-D3)
(1-D3)
(1-D3)
(1-D3)
Duplex Motor Driver
D6
MTZ J22B
IC30
TD62064AF
I1
3
NC
4
NC
5
I2
6
NC
10
I3
11
NC
12
NC
13
GND
17
O1
2
O2
7
O3
9
O4
16
COM
1
COM
8
GND
18
I4
14
NC
15
R338
0J
0J
2
1
R339
0J
0J
2
1
R340
0J
0J
2
1
R341
0J
0J
2
1
PGND
24VSFT
SFTMT0
/SFTMT0
SFTMT1
SFTMT2
/SFTMT1
/SFTMT2
/SFTMT3
SFTMT3
Shifter Motor Driver
(4-B2)
(4-B2)
(4-B2)
(4-B2)
(11-A1)
(11-A1)
(11-A1)
(11-A1)
AL-1556/1566 ELECTRICAL SECTION 12 - 11
(10) NIC PWB
The NIC PWB is used to realize 10Base-T network functions (print
only). It is provided with the CPU, the Ether chip, FPGA, memory, and
the RJ45LAN connector. Data are converted into IEEE1284 parallel
data and sent to the MCU PWB, realizing network functions.
only). It is provided with the CPU, the Ether chip, FPGA, memory, and
the RJ45LAN connector. Data are converted into IEEE1284 parallel
data and sent to the MCU PWB, realizing network functions.
(11) OPE PWB
a. Outline
The operation circuit is composed of the LCD control circuit, the key
matrix circuit, the display matrix circuit, and the buzzer circuit, realizing
the U/I functions.
matrix circuit, the display matrix circuit, and the buzzer circuit, realizing
the U/I functions.
b. LCD control circuit
The character LCD (COG) in 2 lines and 16 digits is used. The display
data are sent from the MCU (CPU) to LCD internal registers, control-
ling the LCD.
data are sent from the MCU (CPU) to LCD internal registers, control-
ling the LCD.
c. Key matrix circuit
The SEL signal is sent from the CPU of MCU to the matrix selector IC
(multiplexer) in the operation circuit. The signal detects OFF/ON of the
key, and is sent to the CPU as serial data.
(multiplexer) in the operation circuit. The signal detects OFF/ON of the
key, and is sent to the CPU as serial data.
d. LED matrix circuit
The display is controlled by inputting the serial data signal, the clock
signal, and the latch signal from ASIC to the LED driver in the opera-
tion circuit.
signal, and the latch signal from ASIC to the LED driver in the opera-
tion circuit.
In the LED driver, data are set to the register (8bit) and latched to con-
trol the IC output port, performing matrix-driving of ON/OFF of the LED.
trol the IC output port, performing matrix-driving of ON/OFF of the LED.
(12) Carriage Unit
a. Outline
The carriage unit is provided with the CCD PWB, the inverter PWB, the
lamps, etc. A document is radiated, and image data read by the CCD
are A/D converted to be sent to the ASIC.
lamps, etc. A document is radiated, and image data read by the CCD
are A/D converted to be sent to the ASIC.
b. CCD PWB
The color image sensor uPD8861 (5400 pixels x 3 lines) is used as the
CCD on the CCD PWB to scan images in the resolution of 600dpi/US
letter size in the main scanning direction.
CCD on the CCD PWB to scan images in the resolution of 600dpi/US
letter size in the main scanning direction.
Image data scanned by the CCD are inputted to AFE (AD9826), where
they are A/D-converted to output digital data. The output digital data
are sent to the MCU PWB and to the ASIC. The ASIC performs image
process with the digital data.
they are A/D-converted to output digital data. The output digital data
are sent to the MCU PWB and to the ASIC. The ASIC performs image
process with the digital data.
c. Lamp inverter PWB
The transformer is controlled by the lamp control signal from the MCU
PWB to turn ON/OFF the cool cathode ray tube by the transformer out-
put.
PWB to turn ON/OFF the cool cathode ray tube by the transformer out-
put.
B. DC power circuit
The DC power circuit directly rectifies the AC power and performs
switching-conversion with the DC/DC converter circuit, and rectifies
and smoothes again to generate a DC voltage.
switching-conversion with the DC/DC converter circuit, and rectifies
and smoothes again to generate a DC voltage.
The constant voltage control circuit is of +5VEN. +24V and +12V are of
the non-control system by winding from the +5VEN winding. As shown
in fig (1), +24V, +12V, and +5V are provided with the ON/OFF function
by external signals. +3.3V is outputted from +5VEN to the regulator IC.
the non-control system by winding from the +5VEN winding. As shown
in fig (1), +24V, +12V, and +5V are provided with the ON/OFF function
by external signals. +3.3V is outputted from +5VEN to the regulator IC.
Refer to the block diagram, fig (1).
fig (1) Block diagram
Noise filter
circuit
Rush current
prevention circuit
Rectifying/
smoothing
smoothing
circuit
Inverter circuit
(Ringing choke converter system)
Rectifying/
smoothing circuit
(Semiconductor switch)
Rectifying/
smoothing circuit
+12V regulator IC
(with ON/OFF function)
Overcurrent
protection circuit
protection circuit
Control
circuit
circuit
Constant-voltage
detection circuit
detection circuit
(Semiconductor switch)
+3.3V
regulator IC
AL-1556/1566 ELECTRICAL SECTION 12 - 12
(1) Noise filter circuit
The filter circuit is composed of L and C. It reduces common noises
and normal mode noises generated from the AC line.
and normal mode noises generated from the AC line.
The common noise means that generated in each line for GND. Its
noise component is delivered through C002, C003, and C022 to GND.
noise component is delivered through C002, C003, and C022 to GND.
The normal noise means that overlapped in the AC line or the output
line. It is attenuated by C023, C001, L002, C004, and L003. Refer to fig
(2).
line. It is attenuated by C023, C001, L002, C004, and L003. Refer to fig
(2).
fig (2) Noise filter circuit
(2) Rush current prevention circuit and rectifying/
smoothing circuit
fig (3) Rush current prevention, rectifying/smoothing circuit
Since the AC power is directly rectified, if there were not this rush cur-
rent prevention resistor (TH001), an extremely large rush current
would flow due to a charging current flowing through the smoothing
capacitor C006 when turning on the power.
rent prevention resistor (TH001), an extremely large rush current
would flow due to a charging current flowing through the smoothing
capacitor C006 when turning on the power.
To prevent against this, the rush current prevention resistor TH001 is
provided between the rectifying diode D003 and the smoothing diode
C006, suppressing a rush current.
provided between the rectifying diode D003 and the smoothing diode
C006, suppressing a rush current.
The rectifying/smoothing circuit rectifies a 60Hz AC voltage with the
rectifying circuit, and smoothes it with the smoothing capacitor C006.
rectifying circuit, and smoothes it with the smoothing capacitor C006.
(3) Inverter and control circuit (Ringing choke converter
system)
Fig. (4) Inverter and control circuit
When the power is supplied to this circuit, the DC voltage, Vref, sup-
plied by the rectifying/smoothing circuit is applied through R006 and
R007 to FET (Q001), turning on Q001.
plied by the rectifying/smoothing circuit is applied through R006 and
R007 to FET (Q001), turning on Q001.
When Q001 is turned on, the drain current, I
D
, flows as the waveform B
in Fig. (5) to apply V
DC
to the main winding, N
P
, on the primary side.
At the same time, a voltage is generated in N
C
winding and applied
through R005 and C008b to the gate of Q001. As a result, Q001 is
turned on rapidly.
turned on rapidly.
At the same time with this, C009 is charged through D001, R001, and
D012. When the potential of C009 reaches 0.7V (= V
D012. When the potential of C009 reaches 0.7V (= V
BE
of Q002), Q002
turns on to turn off Q001.
Fig. (5) Ringing choke converter operation waveforms
ID
Np
Ns
Nc
Q001
VDS waveform
VDS waveform
Q001
ID waveform
ID waveform
Secondary output side
D706 D113
ID waveform
D706 D113
ID waveform
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