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9

• 2-4. LP Engine Control Block

•High Voltage Development Clock Control

It generates control pulse signals with a High Voltage Supply.

•LSU Control

It generates control pulse signals and control a LSU Scan Motor such as observing abnormal 
rotation, etc. It also controls Laser output signals for synchronizing horizontal lines.

•Fuser Control

It controls on/off of Fuser heater with a Low Voltage Power Supply.

•IEEE 1284

It proceeds handshaking conforms to IEEE 1284 requirement and transfers data, such as a 
receiving data from PC (Printer Interface) or a transmit scanned data to PC (PC Scanner). 
It is complied with Compatibility Mode, Nibble Mode, Byte Mode, ECP Mode.

3. System Memory

This system consists of the following memories.

•F-ROM (IC5) 

→ F-ROM (2MB) for programming and data backup.

The program is downloaded from PC via IEEE 1284 parallel port.

•S-DRAM (IC6) 

→ Work RAM, Page Memory, Line Memory, Image Data Memory, Buffer 

(8MB) for transmission and reception. During an electrical power failure, the image data is not 
backed up.

10

1. Scanning LSI

MN860741 (IC18) is a Scanning LSI which generates Shading Correction, MTF Correction, Reduction/
Enlargement, and Gray Scale Error Diffusion. The Image Signal is converted to binary signal and 
transported.

2. TX/RX Motor Drive Circuit

Single Motor is used for TX/RX, which is controlled by Motor Drive Chip SMA7029M (IC26). 

Gray Scale Data

(PC Scanner)

SC (DZEP000602)

Binary Data
(Copy,
 Communication)

MN860741(IC18)

CIS

IA2008-MA30C (A4)

or

IH2010-MB51B (B4)

TX/RX

MOTOR

SMA7029M

(IC26)

Scanning Data

Output

To Memory (IC6)

White

Shading

Correction

Reduction/

Enlargement

CN12

CN3

PNL (DZEP000601)

uPD780022A

(IC2)

Serial I/F

B4 WIDTH SENSOR

ORIGINAL DETECTION

SENSOR

CN51

CPU V850

(IC1)

3 -> 5V

5 -> 3V

SHINE (IC3)

READ POINT SENSOR

CN5

Variable

Resistance

Binary

Error

Diffusion

Gray Scale

Black

Shading

Correction

S/P

Converter

DMA

Controller

S-DRAM

Controller

11

This function reduces the power consumption in standby mode. During Sleep Mode, power is supplied only 
to the Energy Saver Lamp to keep it at a steady ON condition and to the circuit that monitors incoming 
Ringing signals. The power is recovered only when an incoming Ringing signal is detected, a Document is 
detected by the Original Sensor is actuated or the Energy Saver key is depressed.

Sleep Mode Availability

Recovers from Sleep Mode

1

When Image Data is in Memory

No

1

When Energy Saver key is pressed

Yes

2

Self Maintenance Timer

Yes

To keep smooth contact between 
Scanning Roller and Glass, the 
Roller will be rotated for a few 
seconds once a day at the set hour.

3

Original Sensor is actuated

Yes

4

Ringing signal is detected

Yes

Not 1300Hz detection

5

Off-Hook (Handset)

Yes

Not detected in case of Line 
Voltage is too low.

6

Off-Hook (External Telephone)

Yes

Not detected in case of Line 
Voltage is too low and/or some kind 
of Telephone.

7

When printing from a PC

No

12

1. ADF Transmission

2. Memory Transmission

CPU

V850E/MA1

(IC1)

SHINE

DZAC000273

(IC3)

FROM 2MB

Program

(IC5)

      

MN860741

(IC18)

MODEM

MN195006

(IC9)

DAA

 Si3021,

Si3015

(IC11, 12)

D-BUS 3.3V

Laser Printer

IEEE 1284

Transceiver

(IC28)

CIS

PC (IEEE 1284 I/F)

Line

Image

Memory

Line

Memory

Page

Memory

ECM

Buffer

S-DRAM 8MB

(IC6)

(1)

(2)

(3)

CPU

V850E/MA1

(IC1)

FROM 2MB

Program

(IC5)

      

MODEM

MN195006

(IC9)

DAA

 Si3021,

Si3015

(IC11, 12)

D-BUS 3.3V

Line

Image

Memory

Line

Memory

Page

Memory

ECM

Buffer

(1)

(2)

(3)

S-DRAM 8MB

(IC6)

SHINE

DZAC000273

(IC3)

MN860741

(IC18)

Laser Printer

IEEE 1284

Transceiver

(IC28)

CIS

PC (IEEE 1284 I/F)