Baby Lock BL7800 Service Manual page 18

57. Attach the ZPM holder assembly using the two screws.
58. Attach the needle bar supporter assembly using the two springs. (Insert the needle bar clamp into needle bar
crank rod.)
59. Attach the needle bar supporter stud holder using the screw. (Insert the needle bar block arm into the pin on
the needle bar block.)
60. Attach the thread guide cover assembly using the two screws.
61. Attach the SPM holder assembly using the three screws, and couple the horizontal feed shaft and horizontal
feed shaft fixed plate using the spring plate.
62. Attach the set plate D using the screws.
63. Connect the motor connector, attach the main motor using the two screws and catch the motor belt.
64. Attach the bobbin winder assembly using the screw.
65. Attach the handle holder assembly using the two screws.
66. Attach the main PC board assembly using the two screws. Connect the 8 connectors.
67. Attach the presser holder and needle.
Assembly Points
58. Before installing the needle bar supporter assembly, insert it into the needle bar crank rod, insert the needle
bar supporter stud, then install the two springs. Hook the longer end of the spring (E) to the arm-bed.
59. Install the needle bar supporter stud holder from the needle bar supporter pin side, then attaching it using a
14mm screw.
63. Apply a pressure of 200 g at the center of the motor belt, then adjust its tension until it only moves 4 to 6 mm
(A).
* If the belt is too tight, the torque becomes too much, causing the motor to rotate slower and generate an
irregular noise. If the tension is too loose, the belt may jump and the upper shaft may not rotate smoothly
while sewing on denim and other thicker fabrics or overlapping fabrics.
64. When installing the bobbin winder assembly, align the emboss (B) in the bobbin winder assembly holder with
the positioning hole in the arm-bed.
66. When installing the main PC board, insert the bottom left section of the PC board into the notch (C) in the
SPM holder assembly.
66. Insert the connectors correctly and pass the lead wires under the guide (D).
67. When installing the presser holder, raise the presser foot lifter.
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