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.

Used as a chip in E05A02LA pin data to form the circuit 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 board directed the first check whether there is Duanzhen printing, 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.

Second example: OKI-5330SC printer when all the bills are not a needle needle

Trouble is: OKI-5330SC paper printers start trucks to return to the character after the initial position, but in print and on-line self-test, the word car back and forth to campaign, but can not print out the needle for the first printing, print page print without trace.

Troubleshooting: boot words after the printer can return to the initial location of the vehicle on the main circuit of the printer work properly, and when printed words and from the sports car but can not pin print head to print, this phenomenon is a general prints The first control and drive circuit failure. OKI-5330SC for this printer paper, the data signal circuit pin is connected through the serial data transmission cables to the motor vehicle and character-driven on-board print head, and then driven by the boards of two 12-bit displacement drive (M2021) Parallel into the first print out the output signal pin, which would have resulted in all three print needle acupuncture can not print the fault may be: First, print head controller dedicated gate array circuit M61059 (03G) of the print needle signal compensation ODD DATACOUT printing and needle trigger signal failure ODDTRG; Second, the print head control circuit led to the failure needle Print odd signal to allow ODDEN, print driver for the first summary of current signal ODDCOMMON; Third, the print pin drive M2021 damage. To do this, follow these steps for the diagnosis and rule out:

1. Power to close the printer, feeding off the handle after the site and removed the word out motor vehicle plates. Multimeter with static measurement-driven on-board driver odd-numbered print of the needle driver M2021 (Q2) to the foot of the resistance to the positive and negative, the results of normal.

2. Unplug the printer on the shelves all the plugs to connect printers removed after the rack (to remove the four screws fixed), and then remove the main circuit board. Multimeter measured by the static control circuit board controls the print head odd / even-numbered summary of current needle-driven signal line ODD / EVEN COMMON of the transistor TRl3 / TRl2 (2SB883) of the b, c, e on a very positive way, the reverse resistance As a result, are normal.

3. Printer connected to power, were measured TRl3 the TRl2 and b, c, e, a voltage, the results of the measured values are normal voltage. Turn off the power, measured in odd-numbered pin control circuit of the comparator 2901 (0SD) to the foot of the resistance to the positive and negative, the results of normal. And then oscilloscope were then used in the 08D 4 feet and 8 feet observe the odd / even print needle trigger signal ODD / EVEN TRG, found that ODD / EVENTRG signals for a straight line.

4. Were observed M61059 (03C) chips RDN (9 feet) and the WDN (10 feet) on the RD and WR signal, the results have input signal, a preliminary diagnosis of the chip failure, a new post to replace M61059 troubleshooting.

Failure Analysis: M61059 (03C) by 8051 based on the microprocessor to control the external character dot-matrix printer, and the CMOS programmable gate array circuit. Under normal circumstances, the circuitry in the CPU (03E, 8051) under the control of the produce print needle compensation signal ODD / EVENDATACOUT printing and needle trigger signal ODD / EVENTRG, after triggering circuit and protection circuit formed by printing needle to allow the signal ODD / EVENEN, Print needle driver signal ODD / EVENDRV and print driver for the first summary of current signal ODD / EVENCOMMON. In this case is due to the failure of the circuit without damage to the internal print needle trigger signal ODD / EVENTRG output, the entire print head can print pin failure.

Three examples: AR-5400 printer to print paper when printing characters / character less serious shortcomings of the draw

Trouble is: AR-5400 printer to print paper when printing characters / character less draw very serious shortcomings, and even hard to see the print of the characters.

The process of diagnosis and rule out: print head to print more of a sewing needle can not pin printer to print characters appear / Chinese characters less serious shortcomings designated reasons, such failure is the main fault is that the first printing (including print and pin Duanzhen Print needle driver coil line, the first printing have a cable connection or disconnect plug a number of bad contacts) as well as the print head control and drive circuit failure. Duan Zhen first printing in the first test in the first print out the procedures for testing pin print, measured the results of 14,16,18,20,22, 24-pin printer can not pin. According to this failure, according to the following steps for the diagnosis and rule out:

1. Power off 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 been found Duan Zhen.

2. Multimeter used to print the first measurement Coils of each group of DC Resistance, the measured resistance is normal.

3. Check printer cable to connect the first play of the