Brother MFC-370MC User manual

FACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX-270MC/290MC/520DT/520MC

MFC370MC/390MC

NOTE

This Service Manual presents specifications, theory of operation, and maintenance

information which pertain exclusively to the FAX-270MC/290MC/520DT/520MC/

MFC370MC/390MC. For additional descriptions common to both FAX-270MC/

290MC/520DT/520MC/MFC370MC/390MC and FAX170/190/510/HOME FAX,

please refer to the FAX170/190/510/HOME FAX Service Manual.

CHAPTER I.

GENERAL DESCRIPTION

2. SPECIFICATIONS

Model

Color

Modem Speed

CodingMethod

TransmissionSpeed

CCITT Group

Input/OutputWidth

HoldKey

AutomaticCutter

ADFCapacity

Anti-curlSystem

RollPaperSize(Standardthermalf_ermaPLUS)

LCDSize

On-screenProgramming

MemoryCapacity

SuperRne

Smoothing

GreyScale (levels)

One-touchDialing

SpeedDialing

TelephoneIndex

SuperTelephoneIndex

Speaker Phone

Fax/TelSwitch

TADInterface

Enlargement/Reduction

EnhancedRemoteActivation

DistinctiveRinging(FAXAbility)

Next-faxReservation

Help

Caller ID (CallerDisplay)

AutomaticRedialing

AutoReduction

Multi-resolutionTransmission

Polling

DelayedTransmission

DelayedPolling

Coverpage

CallReservation

Call-backMessage

ActivityReport

AutoCNG Detection(New)

TransmissionVerificationReport

ECM

Broadcasting

QuickScanning

Out-of-paperReception

Multi Copy

Multi Transmission

PCl (Missing link)

Confidential Mailbox

Fax Forwarding

Fax-on-demand

Fax Retrieval

ICM RecordingTime 15

Memo/2-wayRecording

Page Memory Yes,

Paging

PersonalFaxMail box(5)

PersonalVoice Mail Box(5)

RemoteControl

TADType

TollSaver

Voice-on-demand

FAX-270MC/290MC

Black (1395)

14400 bps

9 sec.

Max. 216/216 mm

Yes

10pages

Yes

98' (1" Core)

16xl

Yes

512 KB

Yes

64 by Dithered Method

5 locations

Yes

Yes,Simple

Yes

Yes (No secure polling)

Yes,3 timers

Yes

Yes, 20 pages

Yes

minutes

Yes

20 pages

Yes

DSPtype

Yes

MFC370MC

White (1138)

Same as left

Yes, Included

!MFC390MC

White (1138)

Same as left

I-2

Same as left

Yes, Included w/OCR

Model

Color

Modem Speed

Coding Method

Transmission Speed

CCITT Group

Input/Output Width

Hold Key

Automatic Cutter

ADF Capacity

Anti-curl System

RollPaperSize(StandardthermalfTnermaPLUS)

LCDSize

On-screenProgramming

MemoryCapacity

SuperRne

Smoothing

Gray Scale (levels)

One-touchDialing

Speed Dialing

TelephoneIndex

SuperTelephoneIndex

Speaker Phone

Fax/TelSwitch

TAD Interface

Enlargement/Reduction

EnhancedRemoteActivation

DistinctiveRinging(FaxAbility)

Next-faxReservation

Help

Caller ID (CallerDisplay)

AutomaticRedialing

Auto Reduction

Multi-resolutionTransmission

Polling

DelayedTransmission

Delayed Polling

Coverpage

CallReservation

Call-backMessage

ActivityReport

Auto CNG Detection(New)

TransmissionVerificationReport

ECM

Broadcasting

Quick Scanning

Out-of-paperReception

MultiCopy

MultiTransmission

PCl (Missinglink)

ConfidentialMailbox

PowerFailureDialing

FaxForwarding

F_.x-on-demar_

Fax Retrieval

ICM Recording "rime

Memo/2-way Recording

Page Memory

Paging

Personal Fax Mail box (5)

Personal Voice Mail Box (5)

Remote Control

TAD Type

Toll Saver

Voice-on-demand

FAX-520DT/520MC

Black(1395)/White(1397)*

14400 bps

9sec.

Max.216/216

Yes

10 pages

Yes

30 m(1' Core)

16xl

Yes

512 KB

Yes

64 byDitheredMethod

50 locations

Yes

Yes,50 locations

Yes(onlyfor FAX-520MC)

Yes

Yes (onlyfor FAX-520MC)

Yes

Yes,Simple

YesforUK/NLD/SWE/NZ

Yes

Yes(w/secure polling)

Yes,3 timers

Yes

Yes,20 pages

Yes

Yesfor UK/BEL

Yes

15 minutes

Yes

Yes,20 pages

Yes

DSPtype

Yes

I-3

* FAX-520DT: Black (1395)

FAX-520MC: White (1397)

CHAPTER Ill.

THEORY OF OPERATION

IIIII_1

I I

o., ;;:: ....

I • I _ "

Main PCB Circuit Diagram 1/5

OSW1, hook switch sensor (microswitch)

(_) SW2, cover switch sensor (microswitch)

(_) SW3, paper empty sensor (microswitch)

(_) Reset IC which turns on at the powering-on sequence and at any of the reset opera-

tions.

(_) Connector for the control panel

(_) FAX engine (ASIC) which integrates a CPU, digital portion of a MODEM and gate array

for managing the I/Os, memories, and drivers.

(_ XT2, oscillator which oscillates at 16 MHz for the CPU.

(_) XT1, oscillator which oscillates at 32.768 kHz for the calendar clock.

(_ XT3, oscillator which oscillates at 57.6 MHz for the MODEM.

_) Connector for the cutter HP sensor

III - 19

1[v[ _ [ ,- - I ] ;

'""° i,.

,::: _'::

+i+

_4LCal

°_o .,o

I;I!I+_1 _ I! I

Main PCB Circuit Diagram 2/5

(_) E2pROM (16k x I bit)

(_ ROM (256k x 8 bits. Note that the qualification machines for demonstration have a 2-

megabit ROM.)

(_) DRAM (512k x 8 bits)

Q Backup circuit for the calendar clock of the control panel and DRAM.

Ill - 20

'_ I I [ I

!,l ............

,,,

1,I

I I

Main PCB Circuit Diagram 315

® Connector for the CIS

(_)-1:

®-2:

O'3:

®-4:

Power for the ClS LED array

Clock output

Trigger signal output. One shot of this signal triggers a line of scan.

LED control signal output circuit which controls the intensity of the CIS LED ar-

ray.

Input of video data (VID) to the FAX engine

Clamp circuit that gives the bias level to the amplifier of the VlD input circuit ac-

cording to the CLAMP and CLPWM signals issued by the CPU (that monitors

the current video data input) for compensating the DC component of video sig-

nals for the next scan line

Connector for the thermal recording head

(_)-1: Power 26V for the thermal recording head

(_-2: Thermister signals which are normalized by the resistor network and fed to the

FAX engine

(_-3: Strobe signals

0-4: Data signals

_-5: Power 5V for the logic circuit of the thermal recording head

Connector for the motor

Connector for the solenoid (that switches the power transmission)

III - 21

Transistor array which consists of seven transistors

(_)-1: Transistors that control the rotation direction of the motor _._.u_uing to me MM4

through MM1 signals.

(_)-2: Transistor that turns on and off the solenoid.

The combination of the solenoid state and the motor rotation direction deter-

mines to which the motor torque should be transmitted, the cutter, the document

feeding mechanism, or the paper feeding mechanism.

(_-3: Transistor that turns on and off the CR1 relay for switching on and off the +26V

power source to the thermal recording head.

(_)-4: Transistor that turns on and off the CML relay.

(_) Document front and rear sensor circuitry that is active only while the SEON signal is on.

The LEDs for the sensors are driven by the +26V source.

(_)-1: PH1, document rear sensor

(_-2: PH2, document front sensor

! :

III -22

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