Baby Lock BL-6800 Manuel utilisateur

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6. 2001.

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This service manual has been compiled for explaining repair procedures of the MODEL BL6800, BL6300.

This was produced based on up-to-date product specifications at the time of issue, but there may have been

changes of specifications for the purpose of improvements.

Contact manufacturer or local sales company for information concerning such changes.

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

II.DISASSEMBLING AND REASSEMBLING THE SEWING MACHINE................8

III.MECHANICAL ADJUSTMENT STANDARDS AND ADJUSTMENT

PROCEDURES...................................................................................................31

IV.TROUBLESHOOTING PROCEDURES..............................................................63

V.HOW TO ADJUST ELECTRONIC ELEMENTS (BL6800 Only)........................67

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(BL6300, BL6800)

1. Use the operation procedure given in this document.

2. Always disconnect the power cord from the socket before starting to install or remove any parts.

3. Always replace only with genuine Brother parts.

4. Do not alter this sewing machine.

*Doing so can cause fire, electrical shock, injury, etc.

(BL6800)

5. Always use rubber gloves when handling printed circuit boards and never touch the metal portion of a printed

circuit board with bare hands.

6. Keep your bodyearthed in order to avoid generating static electricity.

7. Pack printed circuit boards in aluminum foil and avoid subjecting then to anyform of impact during storage or

transportation.

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

making repairs or the like.

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1.MECHANICAL CHART....................................................................................2

2.POWER TRANSMISSION CHART..................................................................3

3.ELECTRONIC PARTS ARRANGEMENT CHART(BL6800 only)..................6

4.CONTROL SYSTEM BLOCK DIAGRAM(BL6800 only)................................7

5.MOTOR UNIT CONTROL (BL6800 only)........................................................7

6.OTHER ELECTRONIC COMPONENT FUNCTIONS (BL6800 only)..............7

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1. MECHANICAL CHART

-3-

2. POWER TRANSMISSION CHART

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

Thread take-

up lever Thread take-

up crank Worm gear Timing pulley

Needle bar

crank rod

Needle ba

clamp

Needle bar Needle bar

block assembly

Needle

Pattern cam

Zigzag connecting

rod Z finger Selecting cam

Upper shaft

-4-

(B) Mechanism of feed dog and rotary hook movement

Lower shaft

gear

Rotary hoo

assembly

Feed dog

Feed carriage

Vertical feed

cam

Horizontal

feed plate

Feed pattern

cam

Feed finger

Feed regulator

Horizontal

feed shaft

Horizontal feed cam

pulley

Forked

connecting rod

Horizontal

feed arm

Lower shaft

Timing belt

Lower shaft

timing belt

Worm gear Timing pulley

Driving belt

Motor

-5-

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. ELECTRONIC PARTS ARRANGEMENT CHART(BL6800 only)

-7-

4. CONTROL SYSTEM BLOCK DIAGRAM (BL6800 only)

5. MOTOR UNIT CONTROL (BL6800 only)

The main motor for the sewing machine is required to smoothly change from low speed to high speed without any

fluctuation due to load or power supply fluctuations or temperature change. It must also take into account greater

ease-of-use for the sewing machine, for example starting up slowly when starting up and stopping with the

needle up. To fully comply with these requirements, BL6800 uses a microcomputer for PWM control and

controls the main motor with power MOS FETs.

6. OTHER ELECTRONIC COMPONENT FUNCTIONS (BL6800 only)

Start/stop(SS) switch...........................used to start and stop (SS) the machine. If you want to start sewing at low

speed, keep this switch depressed and start sewing.

Backstitch(BK) switch..........................used for backstitching and reinforcement stitches. While this switch is

held down, the sewing machine backstitches at low speed in the reverse

direction. (However, when the foot controller is used, the speed does not

become slow speed.)

Speed (adjustment) volume ................a slide control used to set the sewing machine rotation rate

Needle position(NP) sensor.................detects the drive timing of zigzag and feed pulse motors and detects the

(Rotation Sensor) vertical position of the needle. Also detects the turning angle of the upper

shaft by means of a photointerruptor and shutter installed on the upper

shaft.

Speed sensor (Rotation Sensor).........used to detect the rotation speed of the main motor.

detects the operating speed of the main motor by means of a

photointerruptor and shutter installed on the upper shaft.

Foot controller jack..............................when using the foot controller, connect it to this terminal.

Transformer.........................................used for driving the pulse motors, to illuminate the lamps and to supply

power to the electronic circuitry.

WB light (Lamp)...................................is 12V 5W.

Bobbin winder(BW) switch ..................used to detect whether the bobbin winder has been set when winding the

lower thread.

CPU 32 pin

Drive circuitReset circuit

Speed sensor

Needle position (NP)

Foot controller

Speed volume

Start/stop switch

Backstitch (BK) switch

Bobbin winder switch

Buzzer

Main motor

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

1.DISASSEMBLING AND REASSEMBLING

THE OUTER PARTS AND MAIN PARTS........................................................9

2.LEAD WIRES ARRANGEMENT....................................................................29

3.MAIN PC BOARD ASSEMBLY REMOVEAL(BL6800 Only).......................30

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