Press the ink button and the paper feed button together on the control panel and turn it on. When the power is turned on for 3 seconds, the hand of the paper feed button is released immediately. At this time, the ink button is pressed for about 10 seconds. The light flashes again, then you can release your hand, so that the ROM can be cleared and the motherboard is OK. The purpose of this operation is to clear the waste ink counter. In addition, this can be achieved by adjusting the program.
If you encounter this kind of three-light flash failure two years ago, all of the motherboards will be replaced. Later, the motherboard will be further repaired. Now it is OK to press the control panel a few times. This means that the printer must have experience and patience to remove the fault.
Print head cable disconnection failure analysis
Print head cables are typically made of plastic flexible ribbon cables. This type of cable is prone to creases during use. One is a cable that is inserted into one end of the printhead socket. As the number of insertions and removals of the printhead increases, breakage occurs at the crease (the printhead needs to be removed during repair). under);
The other is that as the printing time increases, the middle portion of the printing cable is easily worn or creased during the movement of the carriage. If the insulation layer on the cable is worn away, the print pin drive signal will be short-circuited with the printer frame, causing the printer main control circuit to malfunction; if the print cable fold is broken, the print pin drive signal will be opened, causing the corresponding print pin. Without the needle printing, the printed characters/Chinese characters are less disadvantageous.
These two faults of the cable can be checked with a multimeter. The method is to put the two test leads of the multimeter on the corresponding lines at both ends of the cable, and measure whether the resistance is zero or not, and if necessary, perform a bending test at the crease to observe whether the resistance value on the multimeter changes. After the diagnosis is broken, replace it with the same type of print head cable. Remember that the breakage of the cable cannot be treated by soldering, because it will be signal short-circuited during use. In severe cases, the signal will be short-circuited to the ground, causing the printer's main control circuit to malfunction.
When the print head cable is creased, but at the end of the break, take precautions to avoid breaking the signal line. The method comprises the following steps: first cutting a length of about 1.5 cm of adhesive tape, and then attaching a thin piece of paper having a length of about o, 5 cm and a width equal to the width of the adhesive tape to the middle of the tape to avoid sticking the middle of the tape to the cable. Together. Then bend the cable slightly outward at the crease, align the paper with the crease, and tape the tape to the cable.
In this way, the tension generated by the tape piece will always force the cable to bend slightly outward at the crease, thereby causing the cable to produce an outwardly appropriate tension at the crease so that the print head can be prevented from being rightward during printing. Movement causes the cable to wrap at the crease, preventing the signal line from breaking in the printhead cable.
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