Brother BL6200 Manuale utente

4. 1998.

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

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

•This service manual is complied for repairing service of DOMESTIC SEWING MACHINE.

BL6200, 6700

PS1000, 1250, 1800, 1950, 2000, 2100

STAR 10, 15, 20, 20E, 30E, 40E

MYSTAR 15

•Use this manual with Parts Catalogue for fault findings when you make a repair.

•This machine is manufactured based on up-to-date product specifications at the time of this issue, but

there may be changes of specifications for improvements.

Contact manufacturer or local sales company for such changes.

Brother industries, Ltd.

Nagoya, Japan

CONTENTS

I. PRINCIPAL MECHANISMS......................................................................... 1

II. TROUBLES AND CHECK POINTS ............................................................. 11

III.HOW TO ADJUST THE ELEMENTS........................................................... 21

IV.HOW TO CHANGE THE PARTS................................................................. 58

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1. Always use rubber gloves when handling a printed circuit board, and do not touch the metal portion of the

printed circuit board with bare hands.

2. Keep the human body earthed to avoid generating static electricity.

3. Pack a printed circuit board with aluminum foil and avoid impact with it while storing or transporting.

4. Do not touch or damage the metal portion of a printed circuit board with a screwdriver or anyother tool

during repairing.

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I.

1. MECHANICAL CHART(B338, B346, B347, B348) .............................. 2

1. MECHANICAL CHART (B341, B349, B351, B352) .............................. 3

2. POWER TRANSMISSION CHART ...................................................... 4

3. DISPLAY SYSTEM BY MICRO-COMPUTER ...................................... 8

3. DISPLAY SYSTEM BY MICRO-COMPUTER ...................................... 9

4. MAIN MOTOR CONTROLLED BY MICRO-COMPUTER .................... 10

- 2 -

1. MECHANICAL CHART (B338⋅B346 ⋅B347 ⋅B348)

* This part is not installed on the B346 since it is a 4-step BH model.

- 3 -

1. MECHANICAL CHART (B341 ⋅B349 ⋅B351 ⋅B352)

* These parts are not installed on the B341, B351 and B352 since they are LCD models.

- 4 -

2. POWER TRANSMISSION CHART

(A) Generating mechanism of needle bar, thread take-up lever and zigzag movements

(B338 ⋅B346 ⋅B347 ⋅B348)

Thread take-up

lever Eccentric

counter weight Upper shaft Pulley

Needle bar

crank rod

Needle bar

clamp

Needle bar Needle bar

supporter

Needle Selecting cam

Pattern cam

Worm gear

Z finger

Zigzag connecting

rod assembly

- 5 -

(A) Generating mechanism of needle bar, thread take-up lever and zigzag movements

(B341 ⋅B349 ⋅B351 ⋅B352)

Thread take-

up lever Eccentric

counter weight Worm gear Pulley

Needle bar

crank rod

Needle ba

clamp

Needle bar Needle bar

supporter

Needle

Pattern cam

Zigzag connecting

rod assembly Z finger Selecting cam

Upper shaft

- 6 -

(B) Mechanism of feed dog and oscillating hook movement

* These parts are not installed on the B338, B346, B347 and B348.

Lower shaft

gear

Outer

rotary hook

assembly

Feed dog

Feed bar

Vertical feed

cam

Drop lever

Horizontal

feed plate

* Rotary shatter

Feed pattern

cam

Feed finger

Feed regulator

Horizontal

feed shaft

Horizontal feed cam

Forked

connecting rod

Horizontal

feed arm

Lower shaft

Timing belt

Timing pulley D

Worm gear Pulley

Motor belt

Motor

- 7 -

BH change

shaft BH change

arm BH stopper BH cam BHF finger

assembly

BH Iever

BH foot

Feed control

cam (BH) BHF finger

assembly

2-(A)

2-(B)

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3. DISPLAY SYSTEM BY MICRO-COMPUTER (B341 ⋅B351)

An 8 bit micro-computer in models installed with an LCD (liquid crystal display) regulates the LCD controller

driver which controls the information shown on the display.

<1 LINE DISPLAY SYSTEM BLOCK CHART>

Power supply

circuit and

motor control

circuit

LCD panel

LCD controller

driver

(SED1278)

8-bit MCU

(M38004M8)

Contrast

volume

Message key

Pattern

sensor BH Iever

SW Bobbin winder

Motor control

P.C. board

LCD unit

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