Troubleshooting method:
Remove the ribbon printing or change to "thick paper status" printing (the print head adjustment handle is
Troubleshooting method:
Remove the ribbon printing or change to "thick paper status" printing (the print head adjustment handle is placed in the "2--3" block or unplug the "thick paper/ The "thin paper" detector skewer (connected to CN13) is in the thick paper state---the method of increasing the needle output force of the KIII machine print head is the same as this)!
2. The printing paper of the 1600KⅢ machine does not feed in place, and the fine adjustment cannot be adjusted. First aid:
Troubleshooting method:
Remove the ribbon stop for printing (emergency ) or replace it with a new one!
3.1600KⅢ machine is missing ***3--5 pins when printing (the header, header cable, and motherboard are all good):
Troubleshooting method:
< p>Baffle failure, correct the abnormal installation position of the baffle!4. After the power-on indicator light is all on, the print head moves normally and the indicator light displays normally:
(a). After the rubber roller rotates (empty paper feeding) for 3 seconds , stops rotating;
(b). When loading a single sheet of paper, the rubber roller stops rotating slightly and no longer feeds paper;
(c). The print head moves slightly to the left It stops immediately, and then beeps three times....
Troubleshooting method:
The "paper width detector" on the left side of the plastic paper guide in front of the print head: found when turning on the machine There is paper, and there is still paper after 3 seconds of paper ejection and it enters a fault state, or although no paper is found when turning on the machine, paper is found as soon as the rubber roller rotates - clean the plastic paper guide in front of the print head (both sides must be cleaned) No need to test!
5. The computer starts normally. When loading a single page of paper, after the rubber roller rotates and feeds about 12 lines of paper, the pause light comes on, the paper out light turns on, and the hair beeps three short times. After a while, the above process is repeated (the rubber roller (When there is still paper under the paper):
Troubleshooting method:
The "paper width detector" on the left side of the paper guide in front of the print head does not detect the paper failure - clean the print head There is no need to test the front plastic paper guide (both sides must be cleaned)!
6. When loading a single page of paper, the rubber roller rotates, but the paper does not go under the rubber roller. Fault:
Troubleshooting method:
Remove it Rubber roller, use alcohol + cotton gloves to wipe the smooth part to restore the friction function, and clean the small rubber roller!
7. Before starting to print, the paper advances about 1 cm. This phenomenon does not occur when printing with a tester:
Cause: Host software failure, the printer is OK! < /p>
9. The print head continuously breaks needles and burns coil 17# or 21#: the cause of the failure is that the head cable passes through the chassis ground!
10. Paper cannot be fed automatically:
a. When the handle (paper control lever) is not placed on the "single page", the paper will not be fed automatically when the single page is placed. ;
b. When the handle is in the "continuous paper" position and CN12 is still in the "single-page paper" state, the continuous paper will not be automatically fed, but the single-page paper will still be automatically fed. Paper;
c. When the handle is in the front position, pressing the "Paper Feed/Eject" key will cause no paper feeding action!
d.93C46 chip cannot automatically feed paper when its parameters are changed: you can press and hold the "Font" + "Paper Cutting/Paper Slot" keys to turn on the machine and restore the factory settings!
11. The first page prints normally, but printing stops at a certain position when printing the second page!
Cause: It’s obviously a computer failure! Don’t be busy with the printer!
< p>12. The printer is connected normally and does not display "out of paper", but when the computer prints, it prompts "out of paper in the printer"----2003.10.23Cause: the signal line behind the printer connected to the host It's skewed.
13. When printing the printer's online test page, the reason why the large characters "come off" is because the printer's "auto line wrap" function is ON!
14. The printer When using the tester, after printing the 5th stitch, the paper automatically comes out of the paper slot and no longer prints (repeated multiple times).
Troubleshooting: Press the "Font" + "Paper Cutting/Paper Slot" keys to turn on the machine
Faults that require removal of the casing and motherboard for repair:
LQ-1600K III machine failure examples (1)-----2002.11.06.
Fault phenomenon: <
/p>
A. After powering on: all the indicator lights flash and the head does not move;
B. After powering on: sometimes the head moves once, and then all the indicator lights flash;
< p>C. After powering on: When printing, sometimes after printing a line, it cannot return to the starting position of the next line and start printing... until the right hits the wall;D. After powering on: The print head moves to the left When returning to the initial position, the movement suddenly stops, and then all the indicator lights flash;
E. After powering on: the print head moves completely normally, but printing is abnormal at the beginning: then all the indicator lights flash;
E. p>
F. Print a few lines normally, but suddenly two vertical lines appear (two rows of needles come out once at the same time) and then hit the wall, and all the indicators flash;
G. Print a few lines normally, Sometimes a line is skipped and then printed again;
Cause of fault:
This fault is caused by poor motor performance of the character carriage! OK after replacement!
--------------------------------------------- -------------
LQ-1600KⅢ machine failure example (2) ----2003.05.11
Fault phenomenon:
a. Sometimes the power-on indicator light does not light up: measure the power supply voltage +5V state: when the power is turned on, it only rises to +3.6V and then drops to +2.4V, so the printer does not respond and the indicator light does not light up;
< p>b. Sometimes the power-on indicator lights up and then goes out: measure the +5V voltage and rises to +4.6~+4.7V, then drops to +2.4~+2.5V and then stabilizes;c. Sometimes the power-on indicator light The light is all on (not extinguished): measure the +5V voltage and stabilize after it rises to +5.2V;
d. Sometimes the "font" light does not light up after turning on the computer, the print head returns to its position, and the keyboard fails: when pressing the key Only the beeping sound/or no beeping sound is heard, but the voltage is normal;
e. Sometimes the computer can be printed online normally, and the keyboard is valid;
Note: This motherboard failure phenomenon is "five poisons" Everything is included, except for the item "the power-on indicator light is all on and flashing"! From this, it can be seen that "the indicator light is all on and flashing" when turning on the computer is not a major fault! !
Fault finding analysis:
a. Cut off the +35V power supply path and then turn on the machine: when the +5V power supply rises to +5.1V, the indicator light is all on, and then the voltage drops to +2.5V. When it drops again, all the indicator lights will go out.
b. Cut off the +35V power supply path and then turn on the machine: When the +5V power supply rises to +5.2V, the indicator lights will all light up, and then remain fully lit without extinguishing.
p>c. When turning on: "+35V" rises to +4.2V and then drops to +2.5V; while "+5V" rises to +3.6V and then drops to +2.4V, all indicators are off. < /p>
d. When turning on: "+35V" rises to +21.1V, then drops to +2.5V; while "+5V" rises to +5.2V, then drops to +2.4V, all indicators light up Lights up and then goes out.
Troubleshooting measures:
1. Update C9 (1000μF 50V), C26 (100μF 50V) capacitors;
2. Re-solder the CPU , gate array chip....
3. Replace the motherboard CN15 (panel skewer) <----The main culprit! ;
(for testing reference)
Now it is basically normal! ! 2003.05.20 Submitted to customer for testing!
--------------------------------------------- --------------
LQ-1600KⅢ machine failure example (3) ----2003.05.20
Fault phenomenon:
a. Turn on the machine: After the print head moves to the initial position, all the indicator lights flash (not go out) - a fault phenomenon at the customer's location;
b. Turn on the machine: All the indicator lights flash immediately (Not extinguished)--Fault phenomenon on the headquarters test bench;
Fault finding analysis:
a. Manifested as CPU/Vref failure;
b. Shown as print head temperature system failure;
c. Measure the Vref voltage (CPU-78) to be +4
.75V (OK);
The print head temperature detection voltage (CPU-73) is +0.54V (OK);
The 35V detection voltage (CPU-74) is + 4.5V (+3.7?V OK);
e. Check that R51 (marked 202--2KΩ) has increased to: 2.98KΩ (the main culprit is here)! .
Troubleshooting measures:
--Replace R51 with a 2KΩ resistor and eliminate the problem!
--------------------------------------------- --------------
LQ-1600KⅢ machine failure examples (4) ----2003.05.20
Fault phenomenon:
Power on: the print head does not move, and all indicator lights flash (not extinguished);
Troubleshooting measures:
Replace IC2 to eliminate the problem!
--------------------------------------------- --------------
LQ-1600KⅢ machine failure examples (5) ----2003.05.20
Fault phenomenon:
a. Turn on: the print head does not move, and all indicator lights are on (not extinguished);
Troubleshooting measures:
a. Clean the motherboard;
< p>b. Replace gate array (IC2--E05B24YA);c. Replace CPU (IC1--TMP96C041AF);
d. The above troubleshooting "three-axe" test is invalid , it is estimated that the fault is on the motherboard (broken wire):
After inspection, it is: CPU-63 (WR) <----> IC5-29 (WE) wire hole has broken wires, connect it and rule it out!
--------------------------------------------- --------------
LQ-1600KⅢ machine failure examples (6) ----2003.05.20
Fault phenomenon:
Power on: the print head does not move, and all indicator lights are off;
Troubleshooting measures:
The voltage of CPU-74 is only +1.7V (abnormal), adjust R51(202) has not changed,
Replacement of IC1 (CPU) is eliminated!
--------------------------------------------- -------------
LQ-1600KⅢ machine failure examples (7) ----2003.06.24
Fault phenomenon:
a. The indicator light often does not light up when the power is turned on: measure the power supply voltage +5V, +35V is normal;
b. Sometimes only the "font" light lights up when the power is turned on: measure the power supply voltage +5V, +35V is normal;
c. Sometimes the power-on indicator light all flashes and then goes out: measure the power supply voltage +5V, +35V is normal;
d. Measure the voltage::CPU-73:=0.54V; CPU-74:=+3.94V;CPU-78:=+4.77V;(all normal voltages).
Troubleshooting measures:
OK immediately after replacing the CPU!
--------------------------------------------- ---------------
LQ-1600KⅢ machine failure examples (8) ----2003.06.25
Fault phenomenon:
a. Turn on the indicator light, the print head moves normally; measure the power supply voltage +5V, +35V is normal;
b. Press the "High Speed" button to turn on the machine, the print head moves normally, and then the indicator light Full light flashes, with an interval of 0.5 seconds;
c. After connecting the tester and turning on the machine, the print head moves normally, and then the indicator light flashes with full light, with an interval of 0.5 seconds;
d. After connecting the tester and turning on the machine, the print head moves normally, and 2 to 3 lines can be printed after turning on the machine three times in a row (most of the printed Chinese characters are correct, but some are incorrect: type other Chinese characters such as :"子"-->"米", or not a Chinese character--with a black block shape), then the indicator light flashes all on, with an interval of 0.5 seconds;
e. Measure the voltage::CPU-73 :=0.54V;CPU-74:=+3.94V;CPU-78:=+4.77V;(all normal voltages).
Related pictures of this topic are as follows:
Fault Troubleshooting measures:
After replacing IC7 (font library) and CPU, it returned to normal----7-day inspection and verification: the case has been closed since June 29, 2003.
----- -------------------------------------------------- -
LQ-1600KⅢ machine failure examples (9) ----2003.07.01
Fault phenomenon:
The power-on indicator light is all bright and flashing, with an interval of 0.1 Seconds, the print head does not move; measure the power supply voltage +5V, +35V is normal;
Cause of fault:
It may be that there is serious leakage in the data lines D0~D7;
p>
Troubleshooting measures:
Look for troubleshooting
--------------------- --------------------------------
LQ-1600KⅢ machine failure examples (10) -- --2003.07.01
Fault phenomenon:
All the power-on indicators are off and the print head does not move; when measuring the power supply voltage +5V, +35V is normal;
Cause of fault:
It may be that there is serious leakage in the address lines A0~A1?
Troubleshooting measures:
Look for troubleshooting
------------------------------------------------- -----
1600KIII machine failure example--(11) 2003.08.28
1. The power-on indicator light does not light up and the fan does not rotate;
2..The power-on indicator light is fully lit and flashes (interval of 0.5 seconds);
(IC2 failure)
----------------- ----------------------------------
1600KIII machine failure example--(12 ) 2003.08.31
Fault phenomenon:
1. The power-on indicator light does not light up and the fan does not rotate;
(To be continued)
---------------------------------------------------------------- ---
1600KⅢ machine failure example--(13) 2003.09.01
1. When turning on the machine, only the "宋体" light is on and the fan is spinning;
2 .The power-on indicator light flashes or lights up completely for 2 seconds and then goes off;
(To be continued)
------------------ ----------------------------------
1600KⅢ machine failure example--(14) 2003.09 .08
---------------------------------------- ----------------
LQ-1600KⅢ machine failure examples (15) ----2003.10.09
Fault phenomenon: < /p>
The print head moves normally when it is turned on, but it cannot automatically feed paper, and the keyboard often malfunctions; but the printer can automatically feed paper once it is online;
Cause of failure:
( To be checked)
-----
-------------------------------------------------- ---
LQ-1600KⅢ machine failure examples (16) ----2003.10.19
Fault phenomenon:
The print head moves normally when the power is turned on, but When printing online, the indicator lights are all on!
Cause: The connection socket between the power board and the host is not in good contact!
--------------------------------------------- ---------
LQ-1600KⅢ machine failure example--(17) 2003.11.06
1. Only the "宋体" light lights up when turning on the machine;
2. The power-on indicator light is not on;
3. The power-on indicator light is all on;
Troubleshooting:
1. Clean the motherboard-- Invalid;
2. After heating the "door array" with a hair dryer, the computer turns on normally, but if it turns on again after a while, the fault recurs;
3. Remove IC2, clean the motherboard and After IC2, re-solder IC2 - Troubleshooting!
LQ-1600KⅢ machine failure example--(18) 2003.11.06
Fault phenomenon:
After turning on the machine, test sheet printed with the print head tester , some Chinese characters turn into strange "black blocks".
Troubleshooting:
1. Clean the motherboard - ineffective;
2. Uninstall Remove IC2, clean the mainboard and IC2, and then re-solder IC2 - troubleshooting!
LQ-1600KⅢ machine failure example--(19) 2003.11.26
Fault phenomenon:
After turning on the machine, sometimes all the indicator lights flash, and sometimes it can Normal printing.
Troubleshooting:
Troubleshooting after replacing the power board
LQ-1600KⅢ+ machine failure example--(20) 2003.12.22
p>Fault phenomenon:
The print head moves normally when the machine is turned on. After placing a single page of paper, the rubber roller rotates to feed the paper: it does not stop until the printing paper rises more than 90 mm from the top of the rubber roller, and The print head beeps 3 times, and the "pause" + "paper out" lights are on at the same time...
Troubleshooting process:
The paper sensor next to the cleaning head is invalid,
The test paper detector and the main board are normal.
The fault is eliminated after replacing the head cable of the paper detector next to the head (checking the head cable shows signs of breakage in the middle).
LQ-1600KⅢ machine failure Example--(21) 2003.12.23
Fault phenomenon:
Never seen fault: super difficult problem, no master can solve this problem yet?
The symptoms of the 1600K III machine failure today are as follows:
The print head moves normally when the power is turned on:
(1). The print head emits 6 beeps with an interval of 0.5 seconds. , with the "paper cutter/paper slot" light lighting up simultaneously and alternately lighting up in three states: --> simultaneously lighting up (when turning on the computer) --> the right light is on --> the left light is on --> both lights are on --> the right light is on ….
(2). The print head moves to the right and continuously emits a beeping sound at an interval of 0.5 seconds, accompanied by the three states of the "paper cutting/paper slot" light turning on alternately. It will never stop. As shown below :
When printing online, first print an extra "@" character, as shown in the figure below:
LQ-1600KⅢ+ machine failure example--(22) 2003.12.26
p>
Fault phenomenon:
The print head moves normally when the power is turned on, and then the rubber roller rotates (in the shape of paper feeding) and stops after about 3 seconds. After that, if a single page of paper is put in, the rubber roller rotates slightly It stops immediately (as if the paper feed has been in place).
Troubleshooting process:
Open the casing and measure the voltage at pin CN7-4 to be +0.20V.
Check that the paper sensor near the head is very clean and there is no need to scrub it.
Replace the paper sensor. Changing the main board does not work.
Adjust the installation status of the paper sensor near the head so that CN7-4 The pin voltage drops to +0.18
Troubleshooting after V.
LQ-1600KⅢ machine failure example--(23) 2004.01.14
Fault phenomenon:
All the power-on indicator lights are not on. The print head does not move; measure the power supply voltage +5V, +35V is normal;
Cause of fault:
Check that IC2-198 and 199 pins are short-circuited,
Troubleshooting After turning on the machine: all the indicator lights are on and the print head does not move;
Cause of failure:
Check that the WR and RD signal lines are disconnected;
Turn on the machine after connecting them All lights are flashing;
Cause of fault:
There are several broken wires in the secondary address lines A0---A7, but the computer starts normally after being connected;
But the online printing is irregular and garbled;
Troubleshooting:
Replacing IC2 has no effect, replacing IC9 is troubleshooting.
LQ-1600KⅢ machine failure examples (24) ----2004.03.17
Fault phenomenon:
All the power-on indicators are off and the print head does not move; when measuring the power supply voltage +5V, +35V is normal;
Cause of failure:
IC9 blew up, IC2 (gate array) was broken;
Troubleshooting measures:
It returned to normal after replacement
< p>LQ-1600KⅢ machine failure examples (25) ----2004.06.15Fault phenomenon:
The print head moves normally when turned on; the test page can be printed online, but the speed Slower;
But printing WORD files is not normal. When printing with the tester, the paper starts to feed after the third stitch is printed. After the paper is empty, it will beep three times, and then "pause" + "out of paper" " light is on. If you press the "Pause" button after loading paper, printing will continue.
Cause of failure:
The 93C46 chip is broken;
Troubleshooting measures :
Normal after replacement
LQ-1600KⅢ machine failure examples (26) ----2004.07.12
Fault phenomenon:
In a company, I repaired the print head and used a tester to print the 4th pin and then take the paper out. Repeated many times, the long iron plate holding the paper back in was invalid. Of course, it was impossible to add a capacitor to the CPU-70 pin at the scene. Later, out of desperation, I changed to the forward paper mode and the test was successful.
My analysis conclusion that "the KIII machine jumps is caused by the rear paper feed sensor" was confirmed by practical tests for the first time.
LQ-1600KIII Examples of machine failure (27) ----2004.08.09.
Fault phenomenon:
The machine is turned on normally. After loading a single page of paper, the paper feeding is paused after 151MM and the beep is heard. Three beeps, the paper out of paper light is on;
After a short pause, and after feeding 151MM of paper, it beeps three times, and the paper out of paper light is on;
If there is paper, repeat the above process, that is, it will not Print any writing
Cause of failure:
It was found that the internal parameters of the chip 93C46 were damaged and could not be restored using the keyboard. After replacement, it was normal
Explanation:
This fault is caused by blind trial use without understanding the principle of KIII machine adjustment procedure
LQ-1600KIII machine failure examples (28) ----2004.08.15.
Fault phenomenon:
1. All the power-on indicator lights are on, but the print head does not move;
2. All the power-on indicator lights are off, and the print head does not move;
3. The power-on indicator light is all on and off, and the print head does not move;
(Measure the power supply voltage +5V, +35V is normal)
Cause of failure:
After replacing IC2 (gate array), the fault phenomenon becomes:
All the power-on indicators are on and the print head does not move;.
Troubleshooting measures:
Look for broken lines:
When KⅢ/KⅢ+ machine is printing, "the paper feeds 97-101MM and then continues printing (if there is still paper)"----referred to as "line skipping" troubleshooting method (for Substantial failure of the detector system - such as disconnection, etc., does not belong to the content of this question):
<p>1. Rotate the lower part of the long paper plate in front of the printer's "rear feed detector" downward and rearward so that when there is paper, the detector can reliably detect the presence of paper.
2. Top When the method is invalid, use this method---capacitor cutting method: stick a C01 capacitor: 10.0μF 50V into the via hole connected to the CPU-70 pin (printed board through-hole--the same below)--to deal with The last resort for KIII machine's "paper feeding (line skipping) during printing" failure (not many people believe it, that's because they have never seen it before)! ! (The "negative" end of the capacitor is inserted into the grounding via hole, and the "positive" end is connected to the CPU-70 pin via hole) ------ (Folk prescription, sincerity will help)
3. Changing the paper feeding method from the front can avoid this fault, so the fault is caused by the rear paper feeding detector.
------------------- -------------------------------------------------- --------------
LQ-1600KⅢ machine fault level:
1. All the power-on indicators are off, but the fan rotates - one Level fault:
A: Clean and resolder the pins of IC2, IC1 and other chips on the motherboard (more than 30% are effective);
B: Find the broken wire and connect it; < /p>
2. The power-on indicator light flashes for a flash or turns off after 2 seconds - Level 2 fault: Same as above.
3. The power-on indicator light stays on - Level 3 Level fault: CPU-WR, RD or IC5 (RAM chip) - pin 22
(chip select signal) and other signal lines are disconnected, the same as above
4. Power-on instructions The light is fully on and flashes (interval of 0.5 seconds/or 0.1 seconds) - Level 4 fault: see below.
LQ-1600KⅢ power-on indicator light is fully on and flashes (interval of 0.5 seconds/or 0.1 seconds) - fault Main reasons:
1. Print head temperature and detection system failure: such as the temperature circuit on the head is blocked, the head cable is disconnected, the print head is not cut, etc.;
Note: CPU-73 pin The normal voltage is +0.54V. If the print head is not connected or the corresponding line is disconnected, all the lights will flash immediately after turning on the machine.
A netizen said:
"I heard that the print head cannot be detected. ! ";"It was caused by a short circuit in the solder joint after the print head coil was replaced";"Boss, the print head cable was plugged in backwards";
2. The +35V voltage is too high, too low or the detection system is faulty: Temporarily missing (no examples have been seen in netizens' comments);
Note: The normal voltage of CPU-74 pin is +3.94V; when this voltage rises to +4.5V, all lights will flash when the computer is turned on, and the head will not move. ;
When the voltage drops to <=+3.5V, all the lights are on (not flashing) and the head does not move when the power is turned on;
Also, after the print head returns to its position after the power is turned on, all the lights are flashing. It may also be caused by the voltage being too high
(when the voltage rises to +4.4V).
3. Print head "initial position" and finding faults: initial position detection The measuring system is broken, the motor performance of the carriage is poor, etc.;
Netizens commented:
"The print head home position sensor is damaged";"The print head home position sensor (HOME sensor) has a line Broken";"It seems that the connector of the word car motor on the motherboard is loose (not cut)";"There may be a problem with the spindle in the machine";
4. Vref voltage and detection system (including CPU) failure: ZD1 is bad, CPU is bad, etc.;
Note: The normal voltage of CPU-78 pin is +4.77V:
Netizens said:
"Motherboard A 4.77V voltage regulator tube on the computer is broken...a small red tube"---ZD1---Editor's note; "I tried the same fault and it was OK after changing the CPU";
5. Some circuits on the motherboard are short-circuited, leaked or open-circuited (IC2 chip is the focus)....
Netizens said:
"Some pins of the BIOS are corroded , caused by poor contact. ";"The motherboard is obviously corroded.";" In short, the CPU self-test has passed. When other ports are further tested, some ports are faulty, so they fail to pass the test.
This requires careful inspection of each circuit. The focus is on short circuit (---leakage---Editor's note), followed by open circuit (whether the address line leading to the RAM chip is open is the key point of inspection). There are also mechanical faults, but they are rare. At the same time, mix "With circuit failure".
LQ-1600K print head repair method (jsxrs patent): The following is a quote from jsxrs' speech at 2002-11-26 17:32:17:
Tell A good solution for you, but it only takes a little effort, is to replace the springs in the print head to make them twice as elastic as the original ones. If you can't find them, just cut off half of the original springs and use the other half. Put other things (enameled wire, etc.) under it, and you're ok. I've modified more than 20 heads, and the results are very good. If you don't believe me, try it. You must also use a good needle and adjust the 10K potentiometer. For a moment, increase the needle force. Don’t forget to tell me if the effect is good. This is my patent (jsxrs)
chu (answer):
No one dares to use it
---------------------------------------- ----------------------------
EPSON-1600K printer failure phenomenon:
1.1600 K machine head, recently I often encounter the strange phenomenon of "the needle goes into the hole and the ribbon is hooked"... It seems that the "hole" is not working: use the spring in the ok hole and the needle to put it into the "hole" When printing, you need to hook the ribbon. It seems like there is a "virus" in the "hole"!
Solution (special effect): Use another print head pin spring to cut off 1/3~4, and This section of the spring is "sleeved" and connected to the bottom of the spring in the "hole", so that the modified spring can be 2 to 3 turns longer than the original spring and everything will be fine!!!
2.1600K When printing, the ribbon often "jumps up": the reason is that the stopper is broken.
3. The print head pin, main board, and head cable are all good, and the measuring coil is also good (?). When printing, The needle just doesn’t come out:
The reason - the coil is tested when the power is turned off, and it is broken when the current is large.
4.LQ-1600k Ask for advice:
(1). There is an LQ-1600K. When the power is turned on, the print head does not reset, and the online and command lights flash at the same time. The print head remains the same after being removed.
Answer: The power supply voltage drops to ~110V---- -- Confirmed
(2). There is an LQ-1600K. Once the print head is turned on and the print head is reset, the online light flashes (the command light goes out), and it works normally after removing the print head
Answer: The print head temperature measuring resistor is short-circuited------you will know after trying it
5.1600K fault example
1600K printer: self-test is normal, and printing starts after being online After a few words, printing stops and 5 beeps are emitted, and then the print head is no longer locked (the main board of this machine is a customer fault board on April 28, 2002. The fault phenomenon was not fixed in the past, and it has been observed to this day, so it is of great reference value) .
After testing: After replacing the M54610 chip and then adding a CPU chip - it was OK immediately!
6. Use the tester to detect the 1600K printing results as shown on the right side of the figure. After multiple printings, the fault records are the same (the left side is the test record under normal conditions - standard): Troubleshooting: Replace the print head and it will be OK immediately. !----2003.08.01
Relevant pictures on this topic are as follows:
7. Today I went to the clinic to repair a 1600K printer----2003.08.01
Fault phenomenon: In the continuous paper state, if there is paper under the rubber roller, if you press the "Paper Feed/Eject" button, the paper will be fed back until the paper has retreated from the rubber roller, but the rubber roller is still rotating to unload the paper... .;
When there is no paper under the rubber roller, pressing the "Feed/Eject" button can sometimes feed the paper, sometimes it cannot, and it needs to be rolled in manually.
Troubleshooting: Replace the motherboard and it will be OK immediately!
8. LQ-1600K machine, the paper out light comes on when the machine is turned on, the head does not move, the print head is hot when you touch it, unplug the head and start the machine normally.
Cause of fault : The header cable is broken,
9. The No. 23 pin of the 1600K reinforced header is too shallow----2003.10.10
After replacing the motherboard, the header cable, and the header.... After repeated tests, the fault was located on the print head.
(The needle is continuous and the coil is not broken)
10. The No. 24 needle of the 1600K head often hangs the ribbon----2003.12.03 < /p>
Test: 7 consecutive prints, 3 times the ribbon was hung, and only 4 times were normal.
After cleaning, spring replacement, needle replacement, the "pin guide plate hole" was ineffective. In the end, I had to replace the coil board on the front of the print head:
Test: 7 consecutive printings were all normal.
Since the coil resistance was normal, the fault was caused by the "magnetic body of the coil board" "Degeneration caused no doubt!
11.1600K starts up normally. Online printing can sometimes print a few lines, but often after printing one line, after the head moves to the initial position, it immediately stops when it starts to move to the right, and emits 5 beeps at intervals. 0.5 seconds----2004.01.03
Exclusion: It is suspected that the carriage drive circuit is weakly soldered (caused by thermal expansion and contraction), and it is normal after re-soldering.
14. Print head, The head cables are all good, but the tester cannot determine whether there are missing pins (the paper is not fed during the test, and the print record cannot be clearly discerned). When printing the test page, missing strokes are displayed in the large characters:----2004.03.04
Cause: The M54610 chip is broken (use hexadecimal printing to determine the damaged data bits