Brother PE-180D Manuale utente

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8. 2001.

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• This service manual has been compiled for explaining the repair procedures for the PE-180D HOME

EMBROIDERY MACHINES.

• Use this service manual in conjunction with the Part List when you make a repair.

• This machine is manufactured based on product specifications which are current at the time of printing of this

manual. However, specifications are subject to change for improvement without notice, so contract the

manufacturer or your local sales agent for information regarding such changes.

Brother Industries, Ltd.

Nagoya, Japan

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I. PRINCIPAL MECHANISMS....................................................................................2

II.DISASSEMBLY AND REASSEMBLY PROCEDURES..........................................8

III.ADJUSTMENT STANDARDS AND ADJUSTMENT PROCEDURES

FOR MECHANICAL PARTS.................................................................................13

IV.PROBLEM DIAGNOSIS PROCEDURES FOR THE ELECTRONIC

SYSTEMS.............................................................................................................34

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Most processes in the manufacturer of LSI devices such as microprocessors involve MOS (metal oxide

semiconductor) technology. It is thus necessary to take extreme care to prevent erasure or other damage caused

by static electricity during the use and manufacture of products using such LSI devices.

This embroidery machine is manufactured and assembled under a strictly controlled system preventing such

damage.

Similar care is also required during the service and maintenance of this product.

Please be sure to observe the following.

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1. Always wear rubber gloves when handling the circuit boards. Never touch metal components with your bare

hands.

2. Ground your body to prevent static charge build-up.

3. When storing and shipping circuit boards, always wrap the circuit board in the specified aluminum foil

wrapper or equivalent static-prevention bag, and protect the circuit board from physical shock.

4. During adjustment and repair, do not touch or damage the circuit board with a screwdriver or other tool, and

do not touch the circuit-side of the board.

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• The following symbols are used in this service manual.

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1.MECHANICAL CHART....................................................................................3

2.POWER TRANSMISSION ASSEMBLY (VERTICAL NEEDLE BAR

MOVEMENT,THREAD TAKE-UP MOVEMENT AND ROTARY

HOOK MOVEMENT)........................................................................................4

3.ELECTRONIC PARTSLAYOUT CHART........................................................5

4.CONTROL SYSTEM BLOCK DIAGRAM........................................................5

5.MAIN MOTOR CONTROL SYSTEM................................................................6

6.PATTERN GENERATOR.................................................................................6

7.OTHER ELECTRONIC COMPONENT FUNCTIONS......................................7

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1. MECHANICAL CHART

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2. POWER TRANSMISSION ASSEMBLY (VERTICAL NEEDLE BAR MOVEMENT,

THREAD TAKE-UP MOVEMENT AND ROTARY HOOK MOVEMENT)

Main motor

T pulley

Hand wheelUpper shaft gearMain shaft

Thread take-up

Cou

r w

Timing belt

Rotary hook shaft pulley

Rotary hook

Needle

Needle bar

Needle bar clamp

Needle bar crank

Thread take-up

lever

Vertical shaft pulley

Vertical shaft

Vertical shaft gear

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3. ELECTRONIC PARTS LAYOUT CHART

4. CONTROL SYSTEM BLOCK DIAGRAM

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5. MAIN MOTOR CONTROL SYSTEM

The main motor must operate at a constant speed regardless of load fluctuations, temperature fluctuations, or

other changes in operating conditions. The main motor is therefore driven by means of PWM (Pulse Width

Modulation) control.

6. PATTERN GENERATOR

This embroidery machine stores the pattern data to memory, and drives the embroidery frame using the X and Y

pulse motors to produce the patterns. It is therefore possible to increase the number of stored patterns and the

total number of stitches by simply increasing the storage capacity of the embroidery machine.

Good positioning and response speed are also required of the pulse motors used in this machine because the

embroidery frame must be moved and stopped in a precise position while the need is up. A PM-type pulse motor

is therefore used with a simple open loop circuit configuration to drive the embroidery frame in this machine.

Pattern generator control block diagram

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7. OTHER ELECTRONIC COMPONENT FUNCTIONS

Start/stop switch ...............................Used to start and stop machine operation. When starting, the embroidery

machine operates at low speed as long as the switch is pressed. The need

will stop in the up position if pressed immediately after the "Raise needle"

error message is displayed.

Touch panel .......................................Used to enter the pattern selection and other sewing conditions. The touch

panel replaces the conventional switches, and makes pattern selection

possible by simply touching the panel.

Presser switch...................................Detects whether the presser lever is up or down.

Rotation sensor.................................Detects the drive timing of the embroidery frame drive pulse motor and the

tension release solenoid and detects the 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.....................................Detects the operating speed of the main motor by means of a photointerruptor

and shutter installed on the upper shaft.

Bobbin winder switch.......................Detects whether the bobbin winder has been set when starting bobbin

winding.

Transformer .......................................Used for pulse motor and solenoid drive, sew light power and for the

electronic circuit power supply.

Work light...........................................Uses an 8-V, 2.4-W bulb to illuminate the presser foot area.

Tension release solenoid .................Opens the tension disc to prevent the needle thread from becoming

tangled when forming long crossover threads.

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

1.DISASSEMBLY AND REASSEMBLY PROCEDURES FOR EXTERNAL

PARTS AND MAJOR COMPONENTS........................................................... 9

2.SECURING THE LEADS................................................................................12

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