Brother Db2-b714-3 Instruction Manual
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Page 21
.~ [I] Presser mech~r:'_ism • --Approx. 6 mm f I. Insert the presser bar 0 from the top of the arm. 2. Mount the presser bar guide bracket 8 onto the groove in the arm, and then pass the presser bar 0 through the presser bar guide bracket G. 3. Mount the washer 8, the presser bar spring 8, and the presser bar spring guide 8, and then tighten the presser foot adjustment screw 8. (Mount the thread wiper holder onto the presser bar 0 and secure it with the screw.) 4....
Page 22
[I] Needle and rotary hook timing adjustments In order for the tip of the rotary hook to catch the loop in the needle thread when the needle rises from the lowest point. the needle and rotary hook must be correct. 1 . Needle bar height • Reference line * Turn the pulley slowly. and lower the needle bar 8 to the needle down position. Confirm that the second from bottom reference line on the needle bar 8 is aligned with the bottom of the needle bar bushing. • Loosen set screw 8...
Page 23
I~ II] Feed dog height adjustment •• A ~ . ~ j B •• A F1 B ~ Feed dog height ,---Rises in the forward direction ===::l ~ t=:= __.., r-_ Descends in the forward direction ==:::::1 ~ c::::::::= _./ I. The standard height of the feed dog for sewing thin materials is 0.8 mm. for medium materials 1.0 mm, and for thick materials 1.2 mm (when the stitch length is set to the maximum). 2. Adjust the feed dog height by loosening the screw 8 when the feed dog 8 is at its height...
Page 24
IT] Synchronizer adjustment 1 . Position adjustment of the thread trimmer signal 18-22 mm Synchronizer Adjustment (8707 /8716) 1. Turn off the power of the machine. (If the hole ICs are to be adjusted. it is important that the power first be turned off.) 2. Remove the synchronizer cover. 3. Rotate the pulley towards you and stop the needle 5 mm above its lowest point. The lower end oft he magnet 0 must be aligned at this time with the upper edge of the thread-trimmer hole IC...
Page 25
11] Thread trimmer adjustment 1 . Replacement of the fixed knife and movable knife * Turn off the power. ilstone Removal of the fixed knife (I) Tip the machine of its side. (2.) Remove the screw 0 and the rotary hook position bracket 8. (3) Remove the screw 8 and the fixed knife 8. @ If the thread trimmer should need sharpening, sharpen the fixed knife 8 as shown in Fig. A. Removal of the movable knife (I) Use the presser foot lifter lever to lift the presser foot. (2)...
Page 26
(I] Tension release lever adjustment * Adjust the nut f) so that the thread trimmer solenoid 0 moves easily for the first 0 -2 mm (tension release lever does not operate) and resists moving for the next 2 -5 mm. Confirm that the tension disc 8 opens 0.5-I mm at this time. Also, when the solenoid is not operating, confirm that the disc is firmly closed. [!]Thread wiper adjustment I. Attach the thread wiper bearing 0 so that when the presser foot is lifted with the knee...
Page 27
~==T=R=O=U=B=L=E=SH====O=O=TI=N=G=G=U=I=D=E=. :::::::::~ [I] Machine head I Trouble I L...-..-.-1 _cause -------~~ 1~...-----c_heck _I IL--_Solution_____._____....l Page I r--Improper needle installation 1--Needle bias. height -Reinstall properly / -Bent needle, blunt needle tip, blocked needle hole 1--Needle ......____ Replace needle / -Improper feed timing 1--Is material fed when needle f---Adjust timing 21 is in material? Needle breaks r- Refer to .. Needle and Rotary -Needle bar...
Page 28
..._____T_rouble-------,J.II L....---_cause -------~~~ L....---_Check -------~~ IL..,_____Solutio_n ....~....----..1 Page I -Improper needle installation -Needle bias. height -Reinstall properly / -Bent needle or blunt needle -Needle bias, height -Replace needle v tip -Improper threading -Threading ,....--Rethread properly / r--Needle bar lift stroke 1-Refer to Needle and Rotary 20 Hook Timing Adjustment Skipped stitches I-I-Improper needle to rotary f-f--Needle lift length 1--Refer to .....
Page 29
..__T_rouble______.l~ ~_cause ______.II----_check ______,II~ _solution~~ Page I Thread trimmer misses Movable and fixed knives Check alignment of thread trimmer Align movable and fixed 23 r--do not meet 1--holder and thread trimmer holder -knives presser i ndcx marks a. neither upper or low-Movable and fixed knife blades Movable and fixed knife Replace movable and fixed 23 er thread is cut r--are burred or abraded t---blades -knives · Movable and fixed knife Is thread trimmer signal...
Page 30
.._T_rouble______.JI L..----1 _cause _____,II L..---_check ______,II L.---_solution--------------1 Page I Thread cutter does not -Thread trimmer signal not Check circuits v move output r--Upper thread too long Check and adjust pretension v 1--Excessive material and Replace with presser foot v presser foot resistance with rear gap Thread wiper does not pull upper thread up I-from material v 1--Early timing~ pulls off Adjust operating time before tension disc closes ---Thread...