Brother BAS-412A, BAS-416A, BAS-423A Service Manual
SERVICE MANUAL
To BAS-412A/BAS-416A/BAS-423A Users:
Thank you very much for purchasing a BROTHER embroidery machine BAS-412A・416A・BAS-423A. The most
up-to-date information must be added in the instruction manual for the machine you are using. Please refer to this
corrigenda when reading the manual.
■ Replacing an adjusting the potentiometer assembly
1. Connect the connector e of the potentiometer w to
the thread tension bracket circuit board q.
Note
Do not connect the potentiometer w to the sewing
machine at this time.
■BAS-412A
NBN: 1 2
■BAS-416A, 423A
Needle No. 1 2 N
Shaft
2. Turn on the sewing machine power.
3. Press the needle bar select key to display the needle
bar selection screen.
針棒選択
NEEDLE
SELECT
4. Turn the knob t to move the needle bar case r so
that the needle hole in the needle plate is in between
needle bars No. 1 and No. 2.
5. Turn the shaft of the potentiometer w clockwise as
far as it will go so that 1 and 2 are flashing on the
needle bar number display, and then turn the shaft
counterclockwise until only 2 is flashing.
6. In this condition, insert the shaft of the potentiometer
w into the knob t so that it does not move, and
secure by tightening the set screw y.
7. Move the needle bar case r to the neutral position
turn the knob t (the position where the needle bar
case r does not move).
8. Check that the needle bars match the numbers in
the display (No. 1 to No. 9) when the keys are used
to move the needle bar case r.
9. Once the operation has been checked and is okay,
securely tighten the potentiometer w set screws y.
■ Replacing the circuit boards (Page 90 for BAS-401/412A/416A)
• Main circuit board
Note:
• Change the MOSIC to a CMOS_IC.
(Addition)
• Connector P9 is a spare connector, and so the cable is not connected. Furthermore, if cap frame
specifications have not been included, connector P10 will also be spare, and so its connector also will not
be connected.
■ Connecting the connectors (Page 112)
• Connector P12 (between main circuit board and tension bracket circuit board) has been added.
(Page 113)
• Connector P14 has been changed (between main circuit board and tension bracket circuit board).
• Additions to connector P18 have been made as given below.
Connector
No.
P18
Between main circuit board and
tension bracket circuit board
■ Replacing the
• The following has been added to the Note for step 4.
"Connector P10 is spare, so the cable is not connected."
• Additions to connector P2 have been made as given below. (Page 103 for BAS-423A)
Connector
No.
Between IO circuit board and
P2
• Changes to connector P10 have been made as given below. (Page 104 for BAS-423A)
Connector
No.
tension bracket circuit board/
color change sensor (head 2)
Connecting point
IOIO
IO circuit board (page 84 for BAS-423A)
IOIO
Connecting point
Connecting point
・Tension bracket circuit
・ Needle bar case posi-
Drive signals
board power supply
Drive signals
tion signal
Drive signals
Symptoms resulting from improper
connection or breakage
・Needle bar case does not operate
normally.
Symptoms resulting from improper
connection or breakage
・Needle bar case does not operate
normally.
Symptoms resulting from improper
connection or breakage
P10
Printed in Japan
Spare
155-412A・416A・423A
1998. 08. H ①
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