Page 2 - SAFETY INSTRUCTIONS; Safety indications and their meanings; Indications; D A N G E R; Symbols
SL-710A i This service manual is intended for SL-710A, DB2-DD7100A, DB2-DD7100 ; be sure to read the SL-710A, DB2-DD7100A, DB2-DD7100 instruction manual before this manual.Carefully read the “SAFETY INSTRUCTIONS” below and the whole of this manual to understand this product before youstart maintenan...
Page 3 - Notes on safety; DANGER; Environmental requirements; Installation
SL-710A ii 2. Notes on safety DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages are present can result insevere injury. CAUTION Environmental req...
Page 4 - CAUTION; Sewing; Cleaning
SL-710A iii CAUTION Sewing This sewing machine should only be used byoperators who have received the necessarytraining in safe use beforehand. The sewing machine should not be used for anyapplications other than sewing. Be sure to wear protective goggles when using themachine.If goggles are not worn...
Page 5 - About the ground symbol
SL-710A iv 3. Warning labels The following warning labels appear on the sewing machine.Please follow the instructions on the labels at all times when using the machine. If the labels have been removed orare difficult to read, please contact your nearest Brother dealer. 4. About the ground symbol The...
Page 6 - INDEX; NOTES ON HANDLING
SL-710A INDEX 1. SPECIFICATIONS .................................... 1 2. OPTIONAL PARTS .................................. 3 3. NOTES ON HANDLING .......................... 4 4. MECHANICAL DESCRIPTIONS ............. 5 4-1. Upper shaft and needle bar mechanism ....... 54-2. Lower shaft and rotary ho...
Page 10 - Table parts
2.OPTIONAL PARTS SL-710A 3 2. OPTIONAL PARTS Part name Part code DD7100A, 710A S80008-001 Presser foot lifting solenoid set A With knee switch DD7100 183959-001 DD7100A, 710A S80009-001 Presser foot lifting solenoid set B Without knee switch DD7100 183960-001 DD7100A, 710A S80007-001 Lower thread de...
Page 12 - MECHANICAL DESCRIPTIONS; -1. Upper shaft and needle bar mechanism
4. MECHANICAL DESCRIPTIONS SL-710A 5 4. MECHANICAL DESCRIPTIONS The mechanisms operate in the order of the numbers given in the illustrations. 4-1. Upper shaft and needle bar mechanism 4-2. Lower shaft and rotary hook mechanism 1627M 8 Lower shaft gear 7 Lower shaft 3 Joint 4 Timing pulley U 2 Rotor...
Page 26 - -6. Tension release wire, ground wire and thread trimmer solenoid
5. DISASSEMBLY SL-710A 19 5-6. Tension release wire, ground wire and thread trimmer solenoid 1 Screw [Loosen] 3 Tension release wire [Remove from wire holder] 2 Screw 4 Tension release wire [Pull out from machine head] 7 Screw [2 pcs: Loosen] 1 Screw [Loosen] 2 Set screw [Loosen] 4 Tension release w...
Page 32 - If the motor will not come out
5. DISASSEMBLY SL-710A 25 5-18. Needle bar and thread take-up mechanism 5-19. Pulley and motor If the motor will not come out 1. Insert the two screws (1) that were removed from the end of the motor into the screw holes (A), andtighten them. This will support the motor and make iteasier to remove. N...
Page 35 - -25. Reverse stitching lever and feed regulator
5. DISASSEMBLY SL-710A 28 5-24. Stitch length dial 5-25. Reverse stitching lever and feed regulator 2 Stitch length dial [Turn counterclockwise all the way] 1 Lock lever [Unlock: DD7100A, 710A only] 5 Stitch length dial [Turn counterclockwise and remove] 6 Positioning pin 7 Spring 1703M 1701M 1702M ...
Page 36 - feed regulator mechanism
6. ASSEMBLY SL-710A 29 6. ASSEMBLY DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages are present can result insevere injury. CAUTION Disassembly ...
Page 54 - Thread trimmer cam position adjustment; Movable knife and fixed knife position adjustment
6. ASSEMBLY SL-710A 47 6-15-4. Adjusting the thread trimming timing Remove the fed dog. Thread trimmer cam position adjustment 1. Turn the pulley to raise the needle bar 5 mm from its lowest position (reference line (a) position) so thatreference line (b) is aligned with the bottom of theneedle bar ...
Page 55 - -16. Rotary hook and bobbin case holder position bracket
6. ASSEMBLY SL-710A 48 Needle bar lowest position 6-16. Rotary hook and bobbin case holder position bracket 1. Remove the feed dog.2. Tilt back the machine head.3. Place the high-speed rotary hook (2) onto the rotary hook shaft (1), and provisionally secure it with thethree set screws (3).* When ins...
Page 56 - -18. Reverse actuator assembly and presser hoot
6. ASSEMBLY SL-710A 49 6-17. Ruler plate and needle plate 1. Remove the needle for safety while working.2. Install the ruler plate (1) to the bed with the screw (2).3. Install the feed dog (3) to the feed bar (4) with the two screws (5). 4. Install the needle plate (6) to the bed with the two pan sc...
Page 57 - spring vertical position; bracket forward/back position
6. ASSEMBLY SL-710A 50 6-18-1. Adjusting the presser foot height The standard height for the presser foot (1) is 6 mm whenthe presser foot (1) is raised by the presser bar lifter (2).1. Raise the presser foot (1) using the presser bar lifter (2). 2. Move the presser bar (3) up and down until the pre...
Page 59 - Quick reverse solenoid adjustment
6. ASSEMBLY SL-710A 52 6-20. Quick reverse solenoid 1. Pass the cord (2) of the quick reverse solenoid (1) under the bed. 2. Install the quick reverse solenoid (1) to the arm with the three screws (4) so that the plunger pin (3) fits intothe groove (A) in the solenoid lever.* Pull the plunger (5) by...
Page 60 - Checking the amount of oil
6. ASSEMBLY SL-710A 53 6-21. Bed under cover (Gear box) 1. Tilt back the machine head.2. Insert the felt (1) into the gear box as shown in the illustration. 3. Install the bed under cover (2) to the bed with the eight screws (3).* Be careful not to clamp the felt (1) at this time. 4. Pour 70 ml of l...
Page 64 - -28. Arm cover, rear cover and bobbin winder tension assembly
6. ASSEMBLY SL-710A 57 6-27. Safety switch 1. Tilt back the machine head.2. Install the safety switch (1) to the bed with the washer (2) and screw (3). 6-28. Arm cover, rear cover and bobbin winder tension assembly 1. Install the arm cover (1) to the arm with the four screws (2). 2. Install the rear...
Page 68 - Turning on the power; If the sewing machine does not operate when the treadle is pressed
6. ASSEMBLY SL-710A 61 6-33. Test operation CAUTION Do not touch any of the moving parts or press any objects against the machine while sewing, as this may resultin personal injury or damage to the machine. For machines with a lower thread detector, set the lowerthread remainder limit before carryin...
Page 69 - -34. Adjusting the safety switch position; Adjustment method
6. ASSEMBLY SL-710A 62 6-34. Adjusting the safety switch position The safety switch (1) is normally installed as shown infigure (A).However, if the processing method used for the tableleaves too much space between the machine head andthe table hole, it may adversely affect the operation of thesafety...
Page 70 - Thread tension spring position
7. ADJUSTMENTS SL-710A 63 7. ADJUSTMENTS CAUTION Maintenance and inspection of the sewingmachine should only be carried out by a qualifiedtechnician. Ask your Brother dealer or a qualified electrician tocarry out any maintenance and inspection of theelectrical system. If any safety devices have been...
Page 74 - -7. Adjusting the needle and feed mechanism timing; Note
7. ADJUSTMENTS SL-710A 67 7-6. Adjusting the needle bar height Reference line (a), which is the second line from thebottom of the needle bar (1)(fourth line from the bottomwhen using a DA X 1 needle) should be aligned with thelower edge of the needle bar bush D (2) as shown in theillustration when t...
Page 75 - -8. Adjusting the needle and rotary hook timing
7. ADJUSTMENTS SL-710A 68 7-8. Adjusting the needle and rotary hook timing The tip of the rotary hook (3) should be aligned with thecenter of the needle (4) when the needle bar (1) movesup from its lowest position to the position where referenceline (b), which is the line at the bottom of the needle...
Page 76 - -10. Matching stitch lengths for normal feed and reverse feed
7. ADJUSTMENTS SL-710A 69 7-9. Quick reverse mechanism 1. Turn the stitch length dial to the maximum setting.2. Remove the rear cover.3. Tilt back the machine head.4. Check that the position of the solenoid lever screw (1) can be verified when the machine head is restored toits normal position.* If ...
Page 77 - Checking method; Adjusting the needle up stop position.
7. ADJUSTMENTS SL-710A 70 7-11. Synchronizer Adjustment The synchronizer uses a single element to detect theneedle up stop position. The needle down single is fixed. Checking method 1. Turn on the power switch.2. Stop the machine with the needle in the needle down position.Check that the distance fr...
Page 80 - -14. Adjusting the rotary hook lubrication amount; Checking the lubrication amount
7. ADJUSTMENTS SL-710A 73 7-14. Adjusting the rotary hook lubrication amount CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such asthe rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook,otherwise inju...
Page 83 - REMOVING AND INSTALLING THE CONTROL BOX; Removal
9. REMOVING AND INSTALLING THE CONTROL BOX SL-710A 76 9. REMOVING AND INSTALLING THE CONTROL BOX DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the walloutlet before opening the face plate of the control box. Touching areas where high voltage...
Page 84 - CONTROL BOX AND MOTOR RATING PLATE; Control box
10. CONTROL BOX AND MOTOR RATING PLATE SL-710A 77 10. CONTROL BOX AND MOTOR RATING PLATE Control box • Check the phase, voltage and type for the control box. • Some specifications are identical for both single- and three-phase. ModelMD-721:DD7100/Single-phase MD-722: DD7100A/Single-phase MD-7220:SL-...
Page 85 - Motor; brother
10. CONTROL BOX AND MOTOR RATING PLATE SL-710A 78 Motor Serial No. NO. G 0 1 A 1 1 1 1 1 Design revision symbol (A, B, C...) Year of manufacture (last two digits of year) Month of manufacture (A - M) DD7100 SL-710A DD7100A brother MD720A NO. G01A11111 brother MD710A NO. G97D11111 brother M-72A NO. D...
Page 86 - CONTROL CIRCUIT BOARD; Name and function of each part
11. CONTROL CIRCUIT BOARD SL-710A 79 11. CONTROL CIRCUIT BOARD DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages are present can result insevere ...
Page 88 - FUNCTION SETTING METHODS
12. FUNCTION SETTING METHODS SL-710A 81 12. FUNCTION SETTING METHODS 12-1. DIP switch functions DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages...
Page 97 - TREADLE UNIT ASSEMBLY
13. TREADLE UNIT ASSEMBLY SL-710A 90 13. TREADLE UNIT ASSEMBLY 13-1. Types • Two different types are available: a type that controls the automatic presser lifter, and a type does not control the automatic presser lifter. • The two specifications are changed over by (A) changing the attachment positi...
Page 99 - 3-3. Setting method for standard depression strokes; ) Signal setting entry
13. TREADLE UNIT ASSEMBLY SL-710A 92 (2) (4) 1844M 13-3. Setting method for standard depression strokes CAUTION If the power switch needs to be left on when carrying out some adjustment, be extremely careful to observe allsafety precautions. When the specifications of the treadle unit are changed or...
Page 100 - ) Memorizing the maximum forward position; ) Memorizing the neutral position
13. TREADLE UNIT ASSEMBLY SL-710A 93 2) Memorizing the maximum forward position • Carry out the following procedure while pressing the treadle forward as far as it will go. 1. Turn the PVR so that “45” appears in columns A and B (4) of the display window. 2. Press the thread trimming key (2). “nn” w...
Page 101 - ) Memorizing the maximum backward position
13. TREADLE UNIT ASSEMBLY SL-710A 94 4) Memorizing the maximum backward position • Carry out the following procedure while pressing the treadle backward as far as it will go. 1. Check that “rr” is flashing in columns A and B (4) of the display window. 2. Press the thread trimming key (2). “F1” will ...
Page 102 - ) Completion of setting
13. TREADLE UNIT ASSEMBLY SL-710A 95 6) Memorizing the modulation position when pressing the treadle backward • Press the treadle backward until the depression force suddenly becomes heavier, and hold the pedal in that position while carrying out the following procedure. (For treadle unit H) • If th...
Page 103 - STANDING OPERATION PEDAL
14. STANDING OPERATION PEDAL SL-710A 96 14. STANDING OPERATION PEDAL Some sub-classes are not equipped witha foot plug set.In such cases, install the foot plug set(J02953-001) by the following procedure. 14-1. Installing the foot plug DANGER Wait at least 10 minutes after turning off the power switc...
Page 104 - At control box; At pedal
14. STANDING OPERATION PEDAL SL-710A 97 14-2. Connectors At control box At pedal Standing operationpedal No. 9P connector 1 DC+8 V 2 High-speed switch 3 Thread trimmer switch 4 SOV 5 Spare 6 Low-speed switch 7 Presser foot switch 8 Variable speed input 9 Ground 1866M <Note> Connector types Man...
Page 106 - AUTO BOBBIN CHANGER
16. AUTO BOBBIN CHANGER SL-710A 99 16. AUTO BOBBIN CHANGER DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages are present can result insevere inju...
Page 107 - SPEED SETTING METHODS
17. SPEED SETTING METHODS SL-710A 100 17. SPEED SETTING METHODS 17-1. Types of speed settings Type of speed Signal Speed Speed setting range Initial setting Minimum setting unit Lo Low speed 150 - 300 220 10 T t Thread trimming speed 150 - Low speed 220 10 SL Slow speed Low speed - 1000 220 100 LI (...
Page 109 - CLEARING THE MEMORY DATA; Types of data that are cleared
18. CLEARING THE MEMORY DATA SL-710A 102 18. CLEARING THE MEMORY DATA Types of data that are cleared Clearing the memory data returns all of the following data items to the factory default settings.• Panel settings• Memory switch settings• Parameter settings• Speed settings• Lower thread counter dat...
Page 110 - CHECKING THE MOTOR AND POWER SUPPLY
19. CHECKING THE MOTOR AND POWER SUPPLY SL-710A 103 19. CHECKING THE MOTOR AND POWER SUPPLY CAUTION Turn off the power and disconnect the power plug from the wall outlet before carrying out these operations,otherwise the sewing machine may operate if the treadle is pressed by mistake, and injury may...
Page 111 - CHECKING THE SOLENOIDS; Machine head; Solenoid-type presser lifter connector
20. CHECKING THE SOLENOIDS SL-710A 104 20. CHECKING THE SOLENOIDS DANGER Wait at least 10 minutes after turning off the power switch and disconnecting the power cord from the wall outletbefore opening the face plate of the control box. Touching areas where high voltages are present can result inseve...
Page 136 - Transformer
21. WIRING DIAGRAMS SL-710A 129 21-4. Transformer 1912M
Page 143 - Problem
22. TROUBLESHOOTING SL-710A 136 22. TROUBLESHOOTING • Please check the following points before calling for repairs or service. • If the following suggestions do not solve the problem, turn off the machine power supply and contact your nearest Brother service center. DANGER Wait at least 10 minutes a...
Page 153 - SERVICE MANUAL
SERVICE MANUAL 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 Printed in Japan 117-S11 I2010820H 2002.09. H (1)
