JUKI
LBH-1790 Series User Manual

R
ENGINEER’S MANUAL
40006360
No.E352-00
Computer-controlled, High-speed,
Lockstitch Buttonholing Machine
LBH-1790 Series

JUKI
LBH-1790 Series Specifications

General

Brand	JUKI
Model	LBH-1790 Series
Category	Sewing Machine
Language	English

Summary

Standard Adjustment

Needle-to-hook timing

Ensures correct timing between needle and hook for stitches.

Adjusting the feed timing belt tension

Sets correct tension for the feed timing belt.

Knife drop position

Ensures the cutting knife drops into the throat plate groove.

Adjusting the stroke and initial position of the cloth cutting knife

Sets the cutting knife's movement and starting position.

Adjusting the needle thread trimmer

Fine-tuning the needle thread trimming mechanism.

Adjusting the bobbin thread trimmer

Adjusting the bobbin thread trimming mechanism.

Adjusting the presser lifter

Adjusting the thread tension

Adjusting the pedal

Adjusting Each Sensor

Adjusting the needle rocking origin

Adjusting the feed origin

Disassembling/Assembling Procedure

Lubrication

Operation Panel

Structure of the operation panel

Initial value data for each shape table

Lists default parameter values for different sewing shapes.

Detailed Explanation of Continuous Stitching

Error Code List

Electrical Components

Gauge Components and Optional Components

Troubles and Corrective Measures

With regard to sewing

Troubleshooting common sewing issues and their causes.

With regard to mechanical components

Troubleshooting mechanical problems and their solutions.

With regard to electrical components

Troubleshooting electrical issues and their causes.

Circuit Diagram

Block diagram A (3-phase 200 to 240V)

Block diagram B (Single phase 230V (for CE))

Block diagram C (Single phase 220 to 240V)

Power circuit diagram (3-phase 200 to 240V)

Detailed power circuit for 3-phase 200-240V.

Power circuit diagram (Single phase 220 to 240V)

Detailed power circuit for single-phase 220-240V.

Power circuit diagram (Single phase 100V)

Detailed power circuit for single-phase 100V.

Servo motor circuit diagram

Circuit diagram for the AC servo motor.

Stepping motor/solenoid circuit diagram

Circuit diagram for stepping motors and solenoids.

Head sensor circuit diagram

Pedal switch circuit diagram

Connection circuit diagram between control box and head

Shows connections between control box and machine head.