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Is There A Separate Manual For The Db2-b791-405?
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Service Manual - Page 1
SERVICE MANUAL FOR
DB2-B791 DB2-B7910
HIGH SPEED SINGLE NEEDLE NEEDLE FEED LOCK STITCH MACHINE WITH AUTOMATIC THREAD TRIMMER
OM
gm
"MUM
41/1. MO San SINS
Service Manual - Page 4
... • Automatic presser foot lifter (Solenoid type)]
BROTHER INDUSTRIE LTD.
• DB2-B791-013 •
MADE IN JAPAN
BROTHER INDUSTRI4 LTD.
• DB2-B791-413 •
MADE IN JAPAN
Inv i-I
BROTHER INDUSTRIE LTD
• DB2-B7910-423 •
MADE IN JAPAN
Specification Application Sewing speed Maximum stitch length
i DB2-8791
Standard
-013
-015
Medium materials Thick materials...
Service Manual - Page 9
... needle position switch @ to UP.
• When the correction switch @ is set the needle position switch @ to an adjustable maximum speed.
8. Sewing speed setting
CON
0
El
EXEDRA*
brother
01 0 2 0 07
0 30 SET
START
PLY INPUT PROGRAMM
1:7 1:1 111
C
111 (Need N
MAX "SPEED ow H
Set the power switch 0 to THICK.
9. The indicator @ goes on. it decreases when...
Service Manual - Page 10
... O.
The programmed pattern can now be sewn automatically.
-9- 12. Sewing examples 0 00 0
- :. 0 2 0 1 0 E
EXEDRA •
brother
0 7
, ► BET STAIR
pty
seta
NPUT =SKIM (SI
-II- --ia- CORRECTION
1 +
o AUTO
_
10 sLow
i START
TACK STITCHES
00 0
1. A
(3) Set the pocket (thick part of the body) under the presser foot and press the PLY SENSOR key 0. Pocket sewing...
Service Manual - Page 11
... start position A to position B.
(7) Press the INPUT key 0.
(8) Press the CLEAR key (to release the temporary stop position.
(8) When sewing is turned on .
(3) Set the material (thick part of the name tag, and press the INPUT key G.
(7) When the margin-to-seam width is the same at A, B, C and D, continue sewing and press...
Service Manual - Page 27
... secure the knife holder
presser with the screw O.
X Make sure the lower thread finger 0 does not strike the movable knife 0. X In model D82-87910, install the reflection holder after installing the lower thread finger.
- 26 - Thread trimmer mechanism
0O0 0
CD 0
0 r
I!I-I-j
®
2 3 9 4 00.0
Ir-G-
0
I L _
Qs) .I
a
0
690060 €1).
0
0
(1) Remove the needle plate.
(2) Place...
Service Manual - Page 28
... clutch ii1) by hand so that the slide block contacts the indent of the knives, shift the thread trimmer lever 0, and then tighten the screw
Set the lower thread finger 0 under the movable knife ©.
- 27 -
Service Manual - Page 29
...Install the slide plate O. (7) Adjust the feed timing. (8) Set the feed amount to pass easily.
0 Make sure the rotary hook ©does not strike the lower thread finger.
- 28 - e (2) Secure the bobbin case holder position bracket with the screw ®.
(3) Place the needle bar thread guide...and tighten the screw ®.
X In model DB2-B7910, install the needle plate in the figure above from...
Service Manual - Page 30
...needle bar clamp 0 from above the arm, and fasten the screw ID.
(5) Install the oil caps m and ®.
- 29 - Presser foot mechanism 0
0
0-4
0... bar 0 into the presser bar guide bracket from above the arm and lightly tighten the screw 0.
(2) Insert the presser spring guide into the presser spring 0 and ...needle bar bracket guide ©with the two screws O.
(4) Insert the needle...
Service Manual - Page 35
... Chamfering Chamfering Washer
O
Snap ring
Forward and reverse feed stitch length are adjusted together. (1) Set the feed regulating dial 0 to mark 3. (2) Sew 11 stitches forward and reverse at the...
2) Loosen the screw 0. 3) When the stitch length for forward feed is greater than for reverse feed, set the hole of the pin 0
lower. 5. Forward and reverse feed stitch length
0
Forward feed
t
i ...
Service Manual - Page 36
... 18-22 mm gap between the needle plate upper surface and the bottom edge of the needle set a 0.5 mm gap between the needle plate upper surface and the needle tip with thin or...When turning on the power and then stopping the machine in the opposite direction. X When installing the pulley, set screw. Synchronizer adjustment
Down needle stop position 18-22 mm
For thin or medium materials ...
Service Manual - Page 38
Servo solenoid adjustment
0 O
0
0.5-0.6 mm
OD 0
O
0 ®I I
0 0 0
O
(1) Set the feed regulating dial 0 to its maximum. (2) Remove the oil cap 0. (3) After loosening the screw @from the oil cap @ hole using a hexagon wrench, adjust the gap between the
reverse link lever assembly O and the reverse lever 0 to 0.5-1.0 mm using the reverse link lever assembly
O.
- 37 - 8.
Service Manual - Page 39
...potentiometer following the procedures below . Potentiometer adjustment (B7910)
The feed dog height is set at the factory as the indicated one if the feed dog height is the same...the potentiometer el. For medium materials (-3): 0.8 mm For thick materials (-5): 1.2 mm
JYESI5 1NO E.
0
SET - OF STITCH
0 4O
MANOR PROD NO. Smaller
(7. The indicated number is decreased when the potentiometer ...
Service Manual - Page 53
...
adjustment manual.
mechanism does
not function. Excessive material,
presser
foot
resistance
Timing too early;
- Excessive pretension
dNeedle too heavy for thread
Up needle stop position too high,
thread removed by thread take -up needle stop position.
Needle thread escapes at up height at sewing
start.
Replace thread
cutter solenoid.
/ Check circuits. Problem
Cause...
Service Manual - Page 54
... pan
Oil
Adjust facing.
45
Adjust thread wiper height.
45
Set thread wiper solenoid switch to on, or replace 45 solenoid. or
z
Replace tube.
rotary
hook
not
lubricated
Filter clogged Tube disconnected Tube broken... oil.
3
No oil in gauge
window; Problem
Cause
Check
Solution
Page
dImproper thread wiper facing
Thread wiper does not wipe thread.
Adjust operating time.
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