promelectroavtomat ULT2003D User manual
SERVICE MANUAL FOR
COMPUTERIZED SEWING MACHINE
ULT2003D
SUPER GALAXIE 3100D
ULT2001N
ULT2001C
M3000N
M3000C
3. 2003.
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This service manual has been compiled for explaining repair procedures of this MODEL.
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.
Brother Industries, Ltd.
Nagoya, Japan
I.PRINCIPAL MECHANISMS..................................................................................1
II.DISASSEMBLING AND REASSEMBLING THE SEWING MACHINE................8
III.HOW TO ADJUST MECHANICAL ELEMENTS.................................................24
IV.HOW TO ADJUST ELECTRONIC ELEMENTS.................................................58
1. Always use rubber gloves when handling printed circuit boards and never touch the metal portion of a printed
circuit board with bare hands.
2. Keep your body earthed in order to avoid generating static electricity.
3. Pack printed circuit boards in aluminum foil and avoid subjecting them to any form of impact during storage
or transportation.
4. Do not touch or damage the metal portion of a printed circuit board with a screwdriver or any other tool while
making repairs or the like.
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I.
1.MECHANICAL CHART....................................................................................2
2.POWER TRANSMISSION CHART..................................................................3
3.ELECTRONIC PARTS ARRANGEMENT CHART...........................................4
4.CONTROL SYSTEM BLOCK DIAGRAM........................................................5
5.MAIN MOTOR CONTROL................................................................................5
6.PATTERN GENERATOR.................................................................................6
7.AUTOMATIC THREAD TENSION....................................................................6
8.OTHER ELECTRONIC COMPONENT FUNCTIONS......................................7
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1. MECHANICAL CHART
EMBROIDERY UNIT MECHANISM
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2. POWER TRANSMISSION CHART
(A) Generating mechanism of needle bar, thread take-up lever and zigzag movements
(B) Mechanism of feed dog and rotary hook movement
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3. ELECTRONIC PARTS ARRANGEMENT CHART
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4. CONTROL SYSTEM BLOCK DIAGRAM
5. MAIN MOTOR CONTROL
The main motor for the sewing machine is required to smoothly change from low speed to high speed without any
fluctuations due to load or temperature changes. To fully comply with this requirement this machine adopts Pulse
width modulation (PWM) control using Field Effect Transistor (FET).
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6. PATTERN GENERATOR
For conventional sewing machines, the pattern was generated by rocking the needle bar and the feed regulator
by means of a pattern cam onto which the pattern data had been mechanically engraved. In contrast to this, this
model stores the data electronically in memory and uses a feed pulse motor, horizontal pulse motor and a zigzag
pulse motor to directly rock the needle bar and the feed regulator to generate the pattern. As a result of this, it is
possible to increase the number of patterns and the number of stitches simply by adding extra memory capacity,
so that about 3,800 patterns comprising a total of approximately 20,000 stitches can be stored. In addition, the
pulse motors must move the position of the needle while the needle is raised and stop it in the correct position
(and similarly, they must move the position of the feed regulator while the needle is lowered). Thus, highly-
precise positioning and a fast response speed are required. Because of this, the feed pulse motor, horizontal
pulse motor and a zigzag pulse motor were adopted, and a simple open-loop structure circuit structure was
employed.
Block diagram of pattern generator control
7. AUTOMATIC THREAD TENSION BLOCK DIAGRAM
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8. OTHER ELECTRONIC COMPONENT FUNCTIONS
Start/stop 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 switch..................................used for backstitching and lockstitching. Backstitching is performed at low
speed in the reverse direction while the switch is pressed. For
lockstitching, three stitches are made at the current needle position and
then sewing stops.
Needle position (UP/DOWN) switch.....used to change the needle position either up or down.
Automatic thread cutter switch.............used to cut the thread automatically. When you press this switch, the
machine will automatically cut the thread, regardless of the needle
position, and stop with the needle at its upper position.
Touch panel..........................................used to select pattern and input test mode number required for sewing by
simply touching the display on the panel. This simplifies the operation for
selecting the desired pattern and number.
Buttonhole stitch switch........................used to detect the edges of the buttonhole stitch by means of the
buttonhole stitch presser foot and lever.
Buttonhole stitch lever switch...............used to detect whether the buttonhole stitch lever is raised or lowered.
Speed 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.
Bobbin winder start stop switch............used to start stop the bobbin winding.
Bobbin winder switch............................used to detect whether the bobbin winder has been set when winding the
lower thread.
Foot controller jack...............................when using the foot controller, connect it to this terminal.
Transformer..........................................used for driving the pulse motors and solenoids, to illuminate the lamps
and to supply power to the electronic circuitry.
Light bulb..............................................is 12V 5W.
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5
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