Examples of printer paper fault maintenance

Stylus printer printer paper is the branch of the stylus printer is also an important applications, mainly in the banking, insurance, industrial and commercial tax and securities industry. This printer has a simple, low-cost printing, mature technology and so on. And other office equipment, due to the frequent use of printer paper and more prone to failure, especially in the first print mostly failure. The following for you to print the first control problems with the drive circuit failures.

The first print control and drive circuits caused by the failure of the main phenomenon in three respects: First, the odd or even number needle acupuncture needles can not, the result is a character printing / severely deformed characters; Second, a number of print for a needle or pin or some individual Print print when no needle injections, the result is a print character / characters of the regular shortcomings less draw, that is, his character / characters in one or more white lines, as well as print characters / character point line together, that is, his character There are one or a few black lines, there will be serious when printing pin was to hang up. Third, we can not print all the needle acupuncture, print the page does not print writing.

First, print head fault control and drive circuits of the reasons



It should be said that various models of printer paper in the overall design is not very different, but some of the specific printer paper and the structure of the circuit is still a certain degree of difference. Therefore, the following general analysis of the first and the reasons for these failures.



1. Acupuncture needles can not print all print



All-pin printer to print bills in print when the needle was not printed, printing was mainly attributable to needle driver coil no incentive to exert high pressure so that the needle does not print the driving force rather than a needle. In addition, some bills have a specially designed pin printer data to form circuits, such as DLQ-2000K, if the first print driver HPW pulse signal failure, the needle will be unable to print to be inspired and the emergence of high-pressure needle can not print all the print needle phenomenon . Another example is the OKI-5330SC printer paper, and is to SERIALCLOCK-N signal synchronization of serial data SERIALDATA-N into the first printing of the needle parallel data signal HEADDATAl ~ 24, SERIALCLOCK-N or SERIALDA-TA-N signal failure , The needle can not print all the print needle.

2. Odd or even number needle acupuncture needle can not print

Some printers, the print head control and drive circuits designed to allow odd-numbered pin signals and even allow the signal pin. In such a design of the printer, only when the signal to allow effective needle odd, odd-numbered pin will it be possible to print out the needle; and even when the juice to allow an effective signal, the needle can even print out the needle. If the odd or even number needle acupuncture needle can not print, testing should be odd or even-numbered pin pin signals whether or not to allow normal. Such as OKI-5330SC, the print head control and drive circuits designed to allow odd-numbered pin signal ODD-EN needle and even allow the signal EVEN-EN.

3. Print part of the individual or needle acupuncture can not print

When the needle to form the data circuit (or circuits dedicated gate array) and circuit Driven pin print individual devices in a part of the damage, it will cause a partial or no acupuncture needle printing individual print. In some printer paper, the incentive is a sub-four-way high-pressure needle to the print driver provided by the coil (such as the AR-5400, AR-6400 paper in the printer to print can be divided into four needle coil incentive to exert high pressure, and the Lexmark 2391Plus paper in the printer is Fensan Lu-pin printer driver for the module to provide the high-pressure). In this form of circuit, which damaged all the way from those it provides high-voltage pin (6 or 8) will not be able to print out the needle. In general, when the printer paper in the print process, the rules have less to 6 or 8-pin failure of this phenomenon, it is possible that this is three or four in a road damage. Therefore, in this type of examination fault circuit should be based on the specific printer paper's print pin driver circuit analysis and testing, the last to find out the damage to the device and be replaced. In addition to print output in the first cable outlet will also be bad for the first printing of individual print needle acupuncture can not print.

E05A02LA chips used in acupuncture as a form of data circuits DLQ-2000K printer paper, as a result of E05A02LA chip 8-line data entry in each of the 3 controls the printing of the needle-pin data signals (E05A02LA chip specific analysis of the circuit, see the back Examples of the circuit), when the machine interface circuit of the 8-bit data input line in a certain way (break) or short-circuit, with its corresponding 3-pin will not be able to pin out of print, print out the character / characters The three will appear on the white lines; 3-pin or needle in a row out of print, print out the character / characters appear on the three black lines (printing Chinese characters at this time will not be accompanied by on-line print, but when a lot of self-print Needle. Therefore, this inspection should also be noted that failure to check their interface circuit).

Second, the print head control and drive circuits to deal with examples of failure

One example: DLQ-2000K printer self-test paper when printing print character shortcomings less draw

Trouble is: DLQ-2000K self-printing paper when the printer to print out shortcomings characters few designated incomplete.

Troubleshooting: The characters from the print / draw characters fewer disadvantages of this phenomenon, caused by failure of the reasons there may be four: first, the print head to print a broken needle; Second, the print driver needle coil or open burn ; The third is to connect the first printing of the decapitation appeared on cable or plug and socket between the individual bad pins; fourth, the first print driver and control panels have a failure. First of all, with the first printing Duanzhen testing procedures to test for the first print out the needle print, the results measured, 5,13,21 needle acupuncture can not print. The following steps according to the diagnosis and rule out:

① power to close the printer, the word will be moved to the car in the middle, followed by ribbon cartridge removed and the first print from the print head in front of the first print-oriented on-board inspection whether Duan Zhen, the results have not found Duan Zhen.

② multimeter with carefully measuring each print head of the DC coil resistance, the resistance value measured in line with the normal value.

③ check printing in the first cables to connect the pins is bad, no problem. Open the top printer from the printer to print on the right side of the first cable outlet on the board off three flat cable, pen table Multimeters the two were up in the search cable (a total of three cables, two wide print head for the cable, the most The sensor is a narrow ribbon and the motor-driven cable signal) corresponds to the two ends of the line, measuring its resistance value is zero, the measured results of the short-pin cable to connect the first group of 9 broken foot, the same model with a flat cable replacement After troubleshooting.

Failure Analysis: DLQ-2000K printer paper's print head pin short drive coil group is the first line of 9-pin, 5,13,2 l coil power of public input side, which is the root along the printer cable is directly outside the rack In a special plug socket, 3 of the cable outside and covered with a piece of metal protection. As the rack, and the most short-pin cable group coil obvious contact with the lower end of the edges and corners, just stuck the cable bending parts. Long-term friction will be the first cable 9 mill off-line, which would result in serious root on the line to short-circuit, that is, +35 V power supply side of the rack to short-circuit the whole circuit of the master printer paper work.