The following symptoms of the cable indicate the need for replacement:
Aging of insulation layer: When the insulation layer of a wire is exposed to the outside for a long time, it is easily corroded by corrosive gases, and the insulation performance gradually decreases. It gradually ages and becomes hard, brittle or falls off, and then it no longer has insulation function. If the insulation layer is found to have lost its luster, darkened, hardened, cracked, or partially peeled off, and the wire becomes stiff when bent with both hands, or even the insulation layer cracks or falls off, it indicates that the wire has undergone varying degrees of aging.
Mechanical damage: The outer sheath of the cable is often torn or fractured, and the surface of the sheath without cracking has burrs or friction marks. There are no signs of damage on the outside of the sheath, but the insulation layer of the wires inside the cable has partially or completely broken. If it is not completely ineffective, it will cause leakage, tripping, and shutdown.
Bending radius exceeding recommended value: When the cable is bent and its bending radius is much smaller than the manufacturer's recommended bending radius, the internal components of the cable are prone to mechanical damage. Damage to wires and insulation layers will occur quickly. Small diameter steel cables can cut off their sheath and/or compress the cable core until the insulation layer is damaged.
Twisting: Twisting is initially caused by a knot ring, and in most cases occurs when pulling the cable from a fixed reel, and is not easy to remove. Twisting can lead to permanent weaknesses.
Current overload: The insulation layer of the cable can withstand a rated temperature of 90 ℃, but the sheath does not have a rated temperature. The purpose of sheath synthesis is to achieve the highest mechanical strength, which is its fundamental function.
Print head cable breakage fault: Print head cables are generally made of plastic flexible ribbon cables. This type of cable is prone to creases during use. If the insulation layer on the cable is worn off, it will cause a short circuit between the printing needle drive signal and the printer frame, resulting in a malfunction of the printer's main control circuit; If the printing cable breaks at the crease, it will open the driving signal of the printing needle, causing the corresponding printing needle to not print, resulting in fewer characters/Chinese characters being printed.
When using cables, the condition of the cables should be checked regularly. Once the above symptoms are found, the cables should be replaced in a timely manner to ensure electrical safety.