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AR-M207 M165 M162 ELECTRICAL SECTION 13-4

This circuit detects ON/OFF of power to control start/stop of each circuit. The 3.3V voltage 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

circuit operations are stopped to prevent against malfunctions.

The heater lamp control circuit detects the heat roller surface temperature and converts in into a voltage level. The converted voltage is inputted to the
CPU analog input pin.

The CPU converts the inputted analog voltage into a digital signal level and compares it with the set value of the simulation to control on/off the heater

lamp according to the level, maintaining the heat roller surface temperature at a constant level.

The lower the heat roller surface temperature is, the greater the thermistor resistance is, and vise versa.

Therefore, the lower the heat roller surface temperature is, the higher the thermistor terminal voltage is, and vise versa. The thermistor terminal voltage

is inputted to the CPU analog port.
The CPU controls ON/OFF of the heater lamp by this input voltage level.

Reset_OUT

(ASIC Reset)

VCC3

VCC3

R18
11kF

 

C23
0.1u

 

C24
22000p

 

R21
10kF

 

IC4

1

2

3

M51957BFP

 

NC

8

GND

 

4

VCC

7

NC

 

1

IN

 

2

NC

 

3

Cd

5

OUT

6

R19
10kJ

 

   CPU

        PF6

IC5A

       /RES

ASIC

FTH

RTH

THOPEN

RTH_IN

(TCCNT)

TCCNT

24V

24V

VCC3

VCC3

24V

VCC3

VCC3

5V

VCC3

24V

24V

24V

T416

1

T403

1

T380

1

T421

1

+

-

IC23B

KIA393F-EL

5

6

7

8

4

R88
7.5kF

+

-

IC27B

KIA358F-EL

5

6

7

8

4

R113
1.2kF

R98
2.7kF

R115
10kF

T404

1

D3

DAN202U or KD

S121

1

2

3

R114
10kJ

D2

MA700

C136

22000p

R87
1MF

R109
300J

R117

300J

R86
1kF

R110
100J

C129

0.1u

R97
10kF

C128
22000p

C137

N.M.

+

-

IC27A

KIA358F-EL

3

2

1

8

4

C127

0.1u/50V

+

-

IC23A

KIA393F-EL

3

2

1

8

4

C130

0.1u/50V

T376

1

D5

KDS226

1

2

3

R89
1kJ

PMCLK

HLOUT

PMCLK_A

AUD_COPY

AUD_CA

(/AUD_CA)

(/AUD_COPY)

HL

FTH

AUD_PNC

(/AUD_PNC)

DSCLK#

DSCLK

5VEN

INT5V

R288

10kJ

R94
240J

T375

1

T371

1

Q5

DTC114EKA

IN

GND

OUT

R243

*0J

IC22

KID65503F

1
2
3
4
5
6
7
8

9

16
15
14
13
12
11
10

1B
2B
3B
4B
5B
6B
7B
G

NC

1C
2C
3C
4C
5C
6C
7C

T373

1

T385

1

T374

1

T372

1

T379

1

D1

1SS355

1

2

3

R93
240J

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AR-M207 M165 M162 ELECTRICAL SECTION 13-5

For IC23 3pin (reference voltage), +3.3V is divided by the resistor.
The thermistor terminal voltage is inputted to IC23 2pin.

When, the voltage at 2pin becomes lower than the voltage at 3pin (when

the heat roller temperature is about 220 - 230°C), IC23 1pin becomes
HIGH, and the HL signal is lowered to the GND potential through IC22,

stopping generation of the heater lamp ON signal. (IC23 1pin is normal

LOW.)

1) Since the thermistor terminal voltage is higher than the set level, the

HL signal from the CPU becomes HIGH.

2) The HL signal is turned to be the HLOUT signal through IC22 protect

circuit, and inputted to the photo triac coupler on the power PWB.

3) When the internal triac turns on, a pulse is applied to the gate of the

external triac. Consequently a current flow from the power source

through the heater lamp to the triac, lighting the heater lamp.

1) Since the thermistor terminal voltage becomes lower than the set

value, the HL signal from the CPU becomes LOW.

2) The HL turns LOW, the photo triac coupler on the power PWB turns

OFF, the external triac turns OFF, and the heater lamp turns OFF.

The voltage at IC23 6pin over the voltage at 5pin to drive the output
THOPEN at 7pin to LOW. This is passed to the CPU and the trouble

code "H2" is displayed.

Since the load signal from the CPU or the ASIC cannot drive the load

directly, it is passed through the driver IC to drive the load.

The driver circuit forms a Darlington circuit with transistors. Therefore a

large drive current is obtained from a small current (ASIC output current).
When the driver input voltage (base resistance input) is HIGH (+3.3V),

the transistor turns ON to flow a current in the arrow direction, operating

the load. When the driver is ON, the driver output terminal voltage is 0V.

The IC34 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.

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

IC26 to the control circuit in the main motor to rotate the main motor.
When the main motor speed reaches the specified rpm, the MMLD

signal is turned LOW and passed through IC115 to the CPU.

LOAD

+24V

ASIC/CPU

OUT PUT

LOAD

(TM_)

(TM)

TMA_O

TMB_O

5VEN

24V

C155

0.1u

R132

47KJ

R133

47KJ

IC34

TA7291AS

2

9

1

5

3

7

8

6

4

VDD

IN1

IN2

VSS

OUT2

OUT1

VCC2

VCC1

N.C

+

C154
10u/35V

CP3

0603FA1.5A

MMLD

 

ASIC

Main Motor

Control

Circuit

( Main Motor)

IC26

TD62503F

 

I1

1

 

O1

 

16

 

I2

2

 

O2

 

15

 

I3

3

 

I4

4

 

O3

 

14

 

I5

5

 

O4

 

13

 

I6

6

 

O5

 

12

 

I7

7

 

COM

8

 

O6

 

11

 

O7

 

10

 

NC

9

MMD

 

MMD

 

/MMD

 

CPU 

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AR-M207 M165 M162 ELECTRICAL SECTION 13-6

With the USB driver, the differential signals (analog) of USB are

converted into digital signal, which are sent to the ASIC. In the reverse
procedure, interface between the ASIC (engine) and the host is

performed.

The IEEE1284 driver is used to perform interface between the ASIC

(engine) and the host.

USB driver
IC401

USB  

connector

 

D -

D+

OE, RCV, VP, VM
Suspend, VMO
VPO

 

 

 

ASIC

Centronics 

connector 

IEEE1284  

driver  

 

IC403  

ASIC

Stepping motors are employed for the mirror motor and the duplex motor. The driver for IC32 (for mirror motor) is the bipolar drive L6219DS.

For control, the ASIC outputs the drive signal to the IC. They drive each motor in 1-2 phase excitement or 2-phase excitement.
Each motor switches the motor current value in each magnification ratio.

Mirror motor drive circuit

The I/F circuit is composed of the USB driver and the IEEE1284 driver, and performs hard interface with the ASIC (MCU PWB).

MM_PH_A

OUT_A-

MM_AI0

MM_PH_B

MM_BI0
MM_BI1

MM_AI1

OUT_A+

OUT_B-

MMref0
MMref1
MMref2

OUT_B+

5V

24VM

5V

PGND

PGND

PGND

PGND

PGND

PGND

PGND

PGND

5V

R121
1.5kJ

R119

0.68J/1W

C147
820p

T445

1

R124
30kJ

R122
1.5kJ

C153
0.1u

R120

0.68J/1W

C149
820p

R123
1kF

T437

1

R125
30kJ

C148
820p

T443

1

C150
820p

R128
910F

T442

1

R127
3kF

+

C151
10u/16V

C152
0.1u

R126
13kF

IC32

L6219DS013TR

2
3
4
5
6
7
8
9

10
11
12

13

14

15

16

17

18

19

20

21

22

23

24

1

OUT 2A
SENSE 2
COMP 2
OUT 2B
GND
GND
I02
I12
PHASE 2
VREF 2
RC 2

VSS

RC 1

VREF 1

PHASE 1

I11

GND

GND

I01

OUT 1B

COMP 1

SENSE 1

VS

OUT 1A

T446

1

T444

1

24V

24VM

PGND

24Vdup

C143
0.1u

CP2

*0603FA1.5A

+

C142
47u/35V

C144
0.1u

CP1
0603FA1.5A

[13]ELECTRICALSECTION.fm  6 ページ  ２００４年１１月１２日　金曜日　午後２時２１分

AR-M207 M165 M162 ELECTRICAL SECTION 13-7

The carriage unit is provided with the CCD PWB, the inverter PWB, and the lamps. It scans documents and transfers AD-converted image data to the

ASIC.
b. CCD PWB

The CCD on the CCD PWB employs the color image sensor uPD8861 of 5400 pixels x 3 lines, and scans documents in the main scanning direction in

the resolution of 600dpi/US letter size.

Image data scanned by the CCD are inputted to the AFE (AD9826), and subject to CDS, amplification, and AD-conversion. Then digital data are
outputted to the MCU PWB and to the ASIC, which performs image process of the digital data.

The transformer is controlled by the lamp control signal from the MCU PWB. The transformer output controls lighting of the cool cathode ray tube.

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. 

The constant voltage control circuit is of +5VEN. +24V are of the non-control system by winding from the +5VEN winding.  As shown in fig (1), +24V,

and +5V are provided with the ON/OFF function by external signals. +3.3V is outputted from 24V to the step down converter. 
Refer to the block diagram.

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