Troubleshooting Of Common Faults In Computerized Sewing Machine

　　 No response to boot, panel indicator light.

　　 Computerized sewing machine This kind of fault is usually caused by circuit breakage or abnormal of the circuit board power supply inside the operation panel. If there is no fault in the control box of the machine, it is important to check whether the connection between the control box and the operation panel is open or not, and check it by root. If the connection is intact, check whether the plug and socket are reliable and whether the solder joints have any solder joints. If the fault is still checked after the check is finished, the failure of the integrated circuit block inside the panel will be damaged.

　　 Abnormal speed regulation

This kind of fault is mostly caused by poor VR1 of governor potentiometer. If the abnormal speed can be caused by the contamination of the VR1 slide, it can be solved according to the following methods: disassemble the operation panel, remove the VR1 lever, wipe the semiconductor surface with a small amount of anhydrous alcohol, and clean the surface. If the VR1 is worn seriously or the internal circuit breaker causes abnormal speed regulation, the entire VR1 potentiometer should be replaced.

　　 Failure of some function keys

Such kind equipment failure There are two cases: 1. Turn on the power switch, some of the function keys fail and the buzzer is silent; 2. When the power switch is turned on, some of the function keys fail, but the buzzer keynote tone is normal. The former fault is usually caused by the contamination of the conductive rubber and the contact part of the circuit board or the damage of the conductive rubber, resulting in the failure of the trigger pulse signal. The maintenance method is to disassemble the circuit board, check whether the conductive rubber of the failure button is damaged or whether it is dirty with the circuit board contact, if the key is damaged, replace it directly, if the contact is bad, wipe the contact surface with the debinding cotton ball with a little anhydrous alcohol. The latter fault is usually caused by the failure of the CPU pin on the circuit board, and can only be replaced by a circuit board.

　　 Abnormal LCD display

Most of these faults are dampened by the screen or the connection between the keyboard circuit and the display screen. Plug Socket contact is not good. If the screen is damp, you can use the electric hair dryer to drive the moisture. If there is a bad contact between the plug and socket, check and troubleshoot the following as follows: if the main screen fails, check whether the CN102 plug socket is defective or not properly contacted. Then check whether there are any disconnecting points in the connection. If the bottom screen is broken, check whether the CN103 plug socket is defective or not properly contacted. Then check whether there are any broken points in the connection.