epson针式打印机换针及维修（Needle replacement andmaintenance of Epson needle printer）Needle replacement and maintenance of EPSON needle printerNeedle printerAbnormal character of needle type machineUnlike the inkjet printer, the needle type machine usually does not need to replace the word car, but the bestsolution is to use the axleRemove, clean, and add oil to the linoleum.Another cause of abnormal car is the word car motor missing phase, the judgment method is to drag the car by hand, feeling more than normalToo light or too heavy to be normal.Another is the HP sensor caused by abnormal car, only the replacement of sensors can solve the problem.Print head troubleshootingBroken needle is the most common failure of printing head, the main reason is:1, printing intensity, large amount of printing, naturally is the main reason for broken needle;2, print head dirt, due to long-term use, the printing headbetween the needle board accumulated ink and paper scraps of dirt, so that the needleBlocked, easy to break the printing needle;3, ribbon broken needle, the use of non original ribbon or ribbon, the use of too long time, so that the organization of the ribbon damage, whenThe stylus is easy to pin off when it hits the ribbon.4, coil short circuit: exclude the quality of the coil itself, the main board of the needle drive tube is also a major reason,If the needle drive is damaged, the corresponding needle drive tube shall be replaced simultaneously after changing the coil.5, thermistor: thermistor damage is very small, the performance of the fault is like the printing head overheating out of the situation.Troubleshooting of printing head of stylus printerThe printing head failure mainly includes: the printing head breaks the needle, the printing needle coil burns out, the gap between the printing head and the printing roller deviatesPrint head cable disconnection.1. print head broken needlePrinter head broken needle is the most common fault printer, this fault almost accounted for half of the total failure. Because the printer hitsThe printing principle consists of a dot array formed by a plurality of printing needles striking the ribbon to form a character / Chinese character. If there is a broken needlein the print head, it will be brokenThe printed characters / Chinese characters have fewer disadvantages. This paper focuses on the needle changing methods of several models:(1) LQ-1600K/ LQ-1900K printer1) structure: LQ-1600K and LQ-1900K printing heads are double needle arrangement structure, needle length andshort two specifications, eachL2 root.2) arrangement: print head 24 pins, odd even double row, as shown in figure 1. The long needles were: 2, 6, 10, 14, 18, 22,3, 7, 11, l 5, 19, 23; short: 4, 8, 12, l 6, 20, 24, l, 5, 9, l3.Needle changing method:First of all, use the print head fault test program to check which needle is out of order, then remove the ribbon box and open the print head lockClamping, pinch the print head fins (i.e. the shell) from both sides, lift up the print head and see two flexibleflat cables connected,Pull out the cable and take out the print head. Wipe the ink stain in front of the print head with alcohol cotton ball to see if there is any needle missing.If you break the needle, you need to change the needle. Change the needle to prepare tools, mainly tweezers, blade, diamond, and steel,Special fixture for oil stone and print head (a tool specially used for removing radiator of printing head). Remove heat sink with special fixture,You can see several layers of structure.Head down, loosen the positioning claw, take the top of the rear copper cover, you can see the ring distribution of 12 long needle, fromThe test results distinguish the broken needle needle is long or short, then the number of the long needle position, with tweezers removed aside; such asFruit and short needle, then continue to remove all long needle, then the blade along separate beneath a yellow copper gasket in the middle, revealing 12 rootShort, use the same method to remove the broken needle. Then take a needle (take long needle or needle as broken needles may be), with fine steelThe accurate measurement of the length of the needle, the needle according to the size of the amount of steel, with good (pay attention to the ground and grinding needle head, and burr)Insert from original position,After changing the finger, gently press the tail of the 12 needles, so that the needle out from the front, at this time, you should see the number 1 needleThe needle No. 24 and the needle pin are exposed, and each pin and the needle should be spaced apart. If there is a wrong position, it must be readjusted. withWhen the finger is released, each needle can receive the needle immediately, so as to ensure the smooth flow of each needle.Only confirm the needle after all the place, before you can install the long needle. The dowel pin must be inserted in front of the copper holderSlot, the long needle layer positioning hole close, check no gaps, you can install long needle. The long needle only needs to be inserted according to the corresponding hole position,Long needle from the tail to the head, to go through a few guide groove, the top slot is very easy to wear. Second holes slightlyIt's difficult. As long as you wear it, the needle can go down, and it's easy to get where you are. Use the thumb to press the armature. The needle should be exposed1mm, that means the needle is good. All after planting, the pressure on the copper cover, no gap should be installed, tripod positioning claw sleeve.The heat sink can be printed and tested on the machine.2. printing needle coil faultAs the print head moves out of the needle, it depends on the magnetic field generated by the driving coil of the printing needle, and controls the attraction or release of the armatureAdvance and retreat of printing needle. If the needle drive coil burns (open circuit), the corresponding printing needle will not be needle, resulting in less printing shortcomingsIf the pin drive coil is short circuited (Ji Chuan), the printer may not work.Printing needle drive coil is normal or not, generally use multimeter R x 1 block to measure its DC resistance method to identify. severalThe direct current resistance of the driving coil of the printing head for various printers is shown in table 1. Take LQ1600K printer as an exampleIntroduce the method of replacing coil.When replacing the coil, a bad coil should be found in accordance with the fixed coil correspondence (Fig. 4), and the bond on the ring frame should be cut off with a knifeRemove the coil with tweezers and electric iron. When removing the bad coil, be careful not to touch the adjacent good coil, install the coilShould pay attention to the coil and iron pins do not collide. Finally, the coils are fixed with gelatin.After the print head has been repaired, the print head is restored according to the reverse order of the disassembly.After the print pin and coil are repaired, don't rush to boot first. If there is a coil damage in the print head, you need to check the printerThe driving triode V1-V24 is normal, the 24 drivetransistor peripheral circuit is exactly the same, so, under normal circumstancesThe static online parameters of each transistor are very close. When the printer is powered off, the drive tubes are measured with a multimeterThe resistance between the B-E and C-E can determine whether the drive tube is defective or not. If the drive tube is damaged, it will still burn out the driveCoil.LQ-1600K 29 soil 2LQ-1600K II is about 42LQ-180OK about 42LQ-1900K about 15DLQ-2000K about 16LQ-800 / 100047 soil 10%LQ-2500 24 soil 10%LX-800 19.2 soil 10%3. the gap between the print head and the printing rollerAfter the printer has been used for a long time, due to the impact and vibration of the printer, or after the printer maintenance (printer's word car mechanism)Being disassembled, repaired or cleaned, the gap between the print head and the print roller changes. If the gap is too small, the impact of the printing needle is too large,It is easy to cause the printing head to break the needle or print too thick, even to become the ink Regiment (commonly known as "brown belt"); if the gap is too large, print the needle fromThe guide plate extends longer and is easy to break the needle. At the same time, the printed characters / Chinese characters are too pale. Therefore, periodic inspection is necessaryThe clearance between the print head and the printingroller is checked and adjusted (especially after the repair of the car mechanism).The clearance between the print head and the printingroller is an important parameter of the printer. If thereis deviation, the light affects the printing effect, the weight of the personUsers should pay attention to regular inspection and adjustment.(1) a general "gap" adjustment method1) remove the ribbon box on the print head.2) open the printer casing and remove the fixed screw of the frame, and the machine is equipped with one end of the adjusting rod of the printing headPlay.3) loosen the fixing nut of the printing head adjusting rod (the adjusting rod is installed on the screw rod bolt with the eccentricity by the nut,Some printers use the screw), the printing head lever dial to second (usually paper position), and in the print headAuthor: 119.122.158.*2009-9-24 15:33Reply to this statementNeedle replacement and maintenance of 3 EPSON needleprinterInsert 4 layers of printing paper (about 0.23-0.27mm thick) between the printing rollers, turn the car slide rod (pay attention to keep the adjusting lever always)In the second, the insertion of 4 layer) paper can have a little friction but gilles. At this time, in the left and middle of the printing roller, respectively,Adjust the right position, and then tighten the fixed nut of the adjusting rod to be uniform.(4) "gap" adjustment method for LQ-1600K, LQ-2500 and LQ-800 / 1000 printersFirst remove the print head, take out the ribbon guide piece, then print the head back to the car, insert the word with the knife edge of the screwdriverThe left and right rotation of the axle is used to adjust the clearance between the print head and the printingroller so as to meet the specified value.4. print head cable disconnection faultThe print head cable is usually made of flexible plastic ribbon cable. This kind of cable is easy to produce crease in useIt is a cable inserted at the end of the print head socket. With the increase of the number of insertion and output of the print head, it will break at the creaseYou need to remove the print head;On the other hand, with the increase of printing time, themiddle part of the printed cable can be easily worn out during the movement of the vehicleProduce crease. If the insulation layer of the cable is worn off, the printing needle drive signal will be short circuited with the printer frame, which will lead to the printerThe main control circuit fault; if the printed cable creases broken, will make the printing needle drive signal open, causing the corresponding printing needle can not be outPin printing, resulting in printing characters / Chinese characters shortcomings less strokes.The two faults of the cable can be checked with a multimeter. The method is to use two million pen tables respectively put on both ends of the cableIf the resistance is zero on the corresponding line, the bending test should be done at the crease if necessary, and the resistance value of the multimeter is observedChange. After the diagnosis of broken wires, the same type of print head cable can be replaced. Remember that the fracture of the cable can not be weldedThis is because the signal short circuit method will be used in the process, and the signal will be short circuited to the ground when it is serious,Causes the printer main control circuit to have the breakdown.When the cable of the print head creases, but the end breaks, preventive measures can be taken to avoid breaking the signal line. The method is:First, cut a sticky tape about 1.5cm long, and then put a piece of tissue paper with the width of about O, 5cm, width and adhesive tape widthGo to the middle of the belt to avoid sticking the middle part of the tape to the cable. Then make the cable bend slightly at the crease, let the paperThe tape is on the right crease, and the tape is attached to the cable.In this way, the pulling force produced by the adhesive tape will always force the cable to bend slightly at the crease so that the cable is in creaseAn external tension is produced so that the printhead can be reliably moved to the right in the printing process, resulting in the cable being in the processFolding at the crease prevents the breakage of the signal line in the print head cable.The director of the hospital has broken the TV and repairedit at the repair shop.Repair shop receptionist: "OK, the boot fee is 50 yuan.""Hospital president: "why is it necessary to pay for it before it is repaired?"Repair shop receptionist: "our repair shop system is like this, your hospital registration fee is not before the doctor should pay?"The president of the hospital had nothing to say, but had to pay 50 yuan."Hello," said the receptionist at the repair shop,What's wrong with your TV set?"Hospital director: "there is no response, the sound image is gone."."Repair shop receptionist: "it seems that your TV is an internal problem, you want to see the engineer or senior engineer, repair fee is an additional 20 yuan engineer, senior engineer to add 30 yuan."."Hospital director: "not just repair TV?" You can fix it, and what engineers do you have?"Repair shop receptionist: "not the same, senior engineer of high level, what problems can repair the TV repaired, therepair rate is significantly lower than the engineers, but the repair cost is relatively high, so the customer of your choice".The director of the hospital: "my TV should not be a general engineer Difficult miscellaneous diseases, good".Repair shop receptionist: that's fine. Please pay 20 yuan for repairs first".Hospital president: "why is it necessary to pay for it before it is repaired?"Repair shop receptionist: "our repair system is like this, your hospital is not before you have to pay it?"The president of the hospital had nothing to say, had to pay 20 yuan, the TV set into the repair shop, came to the engineer's work. The engineer asked about the TV set, first opened three pay lists, and asked the hospital president to pay:First, multimeter measurement fee is 20 yuan;Two, oscilloscope measurement fee 50 yuan;Three, sweep frequency meter fee 80 yuan.The director of the hospital said: "why should the customer the test fee, it is not convenient for you to repair the Engineer?"Engineer: Yes, our engineers previously relied on the "look, smell, ask, cut, listen, experience of repair, but now science has developed, what instruments have, repair to do the test will be more accurate, can also test out not yet manifested the fault. And we're going to spend a lot of money on these instruments, so we're going to have to pay some reasonable fees. You are OK, no more instruments, the last customer sent an electric appliance, we used the network analyzer to test the antenna resistance, the testfee is 150 yuan, people also measured. We will try our best to think for customers, try our best to save money aslittle as possible. Of course, you can also insist on not testing, but when we repair, we may judge mistakes, replace the good parts, and cause unnecessary costs to customers. You may not be able to fix your appliances, and finallyyour time will be delayed."The hospital director had to pay 150 yuan test fee first. After half an hour of testing, the engineer made a circuit diagram with a printer and found that only one triode burned. He took a few minutes and changed a two yuan triode to fix the TV set.The printed circuit Tusai engineer to the hands of the Dean after open a billing, call the hospital to pay 8 yuan feefor printing. Dean asked puzzled: "printing fees also want me out?"" "Yes, this is the rule of the store. The printing fee is out of the customer. Isn't that the picture for you?" "But I can't understand it. What do you want this picture for?"" "Patients in your hospital do B ultrasound,print the drawings, the patient can not understand ah, not the same is the patient money?"Hospital president speechless, had to pay.Finally, the engineer said to the Dean, "we have a computer management system in the store. Please pick up the TV set at the pick up counter.".The delivery counter made a list of repairs to the president of the hospital, which was written on the bill of payment:"According to the Price Bureau regulations, our shop implement sub charges, so that customers clearly consumption. Your repair fee is as follows:35W white light brand soldering iron fee (1 times of welding and disassembly): 10 yuan;Disposable iron head cleaning cotton: 2 yuan;Suction gun charge 1 times: 5 yuan;0.8 environmental protection tin wire 10g: 5 yuan;2N1234 transistor 1: 2 yuan;Cutting triode tube foot oblique pliers use fee: 5 yuan;Water charge for washing plate after welding: 5 yuan;Repair welding triode, cleaning pad and other labor costs: 20 yuan;Total: 54 yuan".The hospital director almost fainted. The president of the hospital spent 282 yuan on television,Only replaced a value of two yuan accessories note: please forward all groups: despise hospital arbitrary charges。
