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33

SCA (UF-595)
SCB (UF-585)

Start Watching I/O

Port

Fuser Heat-up

(lamp ON)

LPC : IC1 Pin34

LPC : IC1 Pin47

Vom < 0.04V

LPC : IC1

Pin48

LPC : IC1

Pin38

LPC : IC1

Pin37

H

N

N

Y

Y

H

L

L

Door Open

Thermistor

Open

Device

Error

STOP

LPC : IC1 Pin47

Vin increase
under 0.04V

Abnormal

temparature

Regist Sensor

ON

Exit Sensor ON

STOP

STOP

Main Motor ON

LPC : IC1

Pin 27,28,29,30

Device

Error

STOP

STOP

Hard Reset

< 1V

B

34

B

LPC : IC1,  Pin48

Vin < 1.4v

Fuser Idle

(Lamp OFF)

Stand-by : Printer Ready
STOP

Internal Process

of High Voltage

LPC : IC1, Pin15,

    16, 17, 18, 19

Stand-by

No Cartrige

N

Y

STOP

: Printer not Ready

35

System Control Block consists of following IC and it controls general function FAX.

1. System CPU : 32-bit RISC (Reduced Instruction Set Computer) type CPU

This CPU is integrated CPU and following device.

2. System Control Gate Array (MSC)

3. Other Peripheral Device

• Mask ROM

:

Boot program (64kb)

• DMA Control

:

PEGASUS 

←→

 Line Memory (DRAM)

• Interrupt Control

:

Several Mechanism timing and Modem data transfer control

• DRAM Control

:

RAS & CAS and Refresh control during power on

• I/O Port

:

I/O device master reset, Monitor Sound control, Read Point Detection
of Docume

• Line Control

:

Relay control of LCU/LCE PCB control and Ringer detection

• Panel I/F 

:

Serial Communication (Command/Status) with Panel Unit

• Address Decode

:

Chip select signal generate from address signal

• DMA Control

:

• Interrupt Control

:

• Scanning Motor Control

:

4 phase control signal output

• Scanning Data Transfer

:

Serial data from FRIP is converted to parallel and transferred to DRAM (Line
Memory)

• LBP I/F

:

Command/Status I/F and Print Data I/F with LBP unit

• Scanning LSI

:

FRIP5/UF-595, FRIP4/UF-585

• Modem LSI

:

V34 MGCS MODEM/UF-595, V17 ROCKWELL MODEM/UF-585

MEMORY CARD

OPTION

Program

FROM

2MB

Work Memory
Page Memory

DRAM

Image

FROM

1MB

FROM

1/2/4MB

Modem

V.17

SH7041

CPU

PEGASUS

Smoothing ROM

Reset

Panel CPU

LBP CPU

FRIP

UF-585 : FRIP4 IC7  
UF-595 : FRIP5 IC17

UF-585 : 2MB IC6
UF-595 : 6MB IC6, 7, 20

Document Memory (60 pages)
Back-up Data

Document Memory
Page Memory

PC I/F

Printer I/F

7.16 MHz

MN195004

V34 Modem

FROM

Modem

Program

TR88017

Anaolg

Modem

SRAM

(UF-585)

(UF-595)

OPTION

BOARD

IC10

IC11

IC8

IC3

IC2

IC4

IC5

UF-585 : IC11
UF-595 : IC24

IC9

36

• FROM (IC4 or IC21)

:

System control program(2MB)

• FROM (IC5)

:

Document Memory, Job Management, Real Time Clock RAM Setting, Journal,
Telephone No., TX/RX/Print counter (1MB)

• DRAM

:

CPU Work area, Line Memory ECM Buffer memory UF-585 IC6 (2MB), UF-595
IC6,7,20 (6MB)

• FROM Card (option)

:

Document Memory (1,2,4MB)

• System Reset

:

Reset IC (IC11 UF-585, IC21 UF-595) always watches 5V (pin3). When 
watching Voltage becomes to less than 4.5V, system reset signal (pin2) 
becomes to 0V.  Reset interval is 60ms.

• Watch Dog Timer

:

When software runaway, CPU puts out Watch Dog Timer Over signal to 
PEGASUS and PEGASUS puts out system reset to CPU via Reset IC.

• Master Clock 7.16MHz

:

X1

→

CPU

• System Clock 28.64MHz

:

CPU(SYSCLK)

→

PEGASUS,MODEM

• Mechanism Clock 16 MHz

:

PEGASUS(MACK)

→

FRIP

Reset IC

PEGASUS

CPU

FRIP

Modem

Panel

LBP

CPU

RESOUT

FRPRST

MDMRST

PNLRST

PRST

I/O

Port

WDTOVR

5V

5V

WDT OUT

LPC PCB