print head repair secrets - william hor

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Brought To You By William Hor

www.printheadrepairguide.com

ImagineX ElectronicS

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Copyright@ All Rights Reserved

Warning! This is a copyrighted material; no part of this guide may be reproduced or transmitted in any form whatsoever, electronic, or mechanical, including photocopying, recording, or transmitting by any informational storage or retrieval system without expressed written, dated and signed permission from the author. You cannot alter, change, or repackage this document in any manner.

William Hor reserves the right to use the full force of the law in the protection of his intellectual property including the contents, ideas, and expressions contained herein. Be aware that eBay actively cooperates in closing the account of copyright violators and assisting in the legal pursuit of violations. If you get this ebook from EBAY other than my website http://www.printheadrepairguide.com, please let me know so that I will reward you.

DISCLAIMER AND/OR LEGAL NOTICES

The reader is expressly warned to consider and adopt all safety precaution that might be indicated by the activities herein and to avoid all potential hazards. This E-book is for informational purposes only and the author does not accept any responsibilities or liabilities resulting from the use of this information. While every attempt has been made to verify the information provided here, the author cannot assume any responsibility for any loss, injury, errors, inaccuracies, omissions or inconvenience sustained by anyone resulting from this information. Most of the tips and secrets given should only be carried out by suitably qualified electronics engineers/technicians. Please be careful as all electrical equipment is potentially dangerous when dismantled. Any perceived slights of policy, specific people or organizations are unintentional.


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If you have any information regarding the illegal reselling or duplication of this E-book, please report it to [email protected] .You will be rewarded accordingly.


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Acknowledgement

This book is dedicated to my

business partner Jestine Yong for

his encouragement and support,

And also to my loving wife Stephanie Kok for taking the time to edit all the photos.


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PRINT HEAD REPAIRING EBOOK

Table Of Content

Preface 2

Acknowledgement 4

Table Of Contents 5

Introduction to Dot Matrix Print Head 8

Safety First 8

Equipment Needed To Repair A Print Head 9

Types Of Epson Print Head 13

Print Head Assemblies And Configurations 15

Identifying A Broken Print Head 18

Step By Step On Disassembling A Print Head 19


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Print Head 1st And 2nd Assembly Parts And Functions 37

1. Top Cover 39

2. Long Pin Wire 44

3. Spring Assembly 49

4. Solenoid 56

How To Check From Printer Main Logic Board 62

Removing Pin Wires From 2nd Print Head Assembly 67

Taking Out A Broken Pin Wire 71

Cleaning All The Pin Wires 72

Reconfirming A Good And A Broken Pin Wire 74

Cleaning Pin Wires Guide Assembly 76

(For Bigger Size Print Head)

Cleaning Pin Wires Guide And Plates 78

Pin Wire Guide Plate Configurations 83


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How To Assemble Back The Print Head 85

Cleaning The Pin Wires Guide Assembly 113

(For Smaller Size Print Head)

Cleaning Pin Wires Guide And Plates 113

How To Assemble Back The Print Head 115

Realigning Print Head In The Printer 123

How To Get Parts For The Print Head 131

Words From Author 132

Recommendation On Other Ebook By Author 133


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Introductions To Dot Matrix Print Head

Print head is a piece of device located in a dot matrix printer which functions is to form images or characters from a computer “soft print” to hard copy on the papers, carbon copies or carbonless copies by moving the print head in a horizontal directions. As it moves in horizontal directions, it fired patterns of dots on paper by striking a pin wires into inked ribbon selectively to form desired characters.

Most Epson print head consist of 24 pin wires which are arranged in a 2 vertical columns. Each column consists of 12 pin wires. However, there are also some print head having 9 pin wires arranged in a single vertical column. The 24 pin wires print head have better print quality then the 9 pin wires print head.

Safety Precautions

Before we start with print head repairing, there are a few safety precautions I would like to highlight.

1. Do not wear a tie or a long necklace or a ring when you test the printing on a printer as when the print head moves horizontally from right to left and left to right, your tie or necklace might get entangled with the moving parts such as print head, platen or motor. This might cause serious injury especially if it is a heavy-duty printer.

2. Beware of this print head as will heat up after long printing sessions. This perhaps may not get your hands burnt but still may caused your body reflex to throw or let go the print head which in turn may damage the print head. The best solution is to let the print head to cool down before you take it out from the printer.

3. As all the print head parts are small, it is best to ensure that children have no contacts with them. Some of the parts may choke a child if swallowed. Handle the parts carefully because if dropped you might easily lose sight of it. Put all your printer parts


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in a small container or boxes so you will know where to find it when you need it.

Equipments needed to repair a print head

Although you can modify some of your existing tools in your garage to suit a print head repair, there are few equipments or instruments that are essentials in print head repair. Here are my lists:-

1. Magnifying glass with attached lamp


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2. Multimeter

3. Pressing tool


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4. Tweezers

5. Philips screw driver


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6. A small flat type screw driver

7. Snap blade


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I recommend you to read thoroughly the entire process of this ebook before starting your own print head repair.

Types Of Epson Print Head

There are two types of print head i would like to mention in this e-book. The first one has a bigger size print head and it is use on a printer model such as LQ-2170, LQ-2180, LQ-2190 and so on....

Bigger size print head


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The second one has a smaller print head and it is use on printer model such as LQ-590, LQ-2080, LQ-2090 and so on....

Smaller Print head


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Print Head Assemblies And Configurations

There are two major assemblies in the Epson print head which consist of 12 pin wires on each assembly. The 12 pin wires on these two assemble are necessary because they are in two different lengths. The 1st assembly has a longer pin wire while the 2nd assembly has a shorter pin wire. Overall there are 24 pin wires which are separated into two different lengths.

Below is the print head configuration for the 1st assembly which consists of 12 long pin wires. I labelled them in numeric forms from 1 to 12.


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Below is the print head configuration for the 2nd assembly which consists of 12 shorter pin wires. I labelled them in alphanumeric forms from A to L.


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These are the locations of all the pin wires as labelled in numeric and alphanumeric forms.


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Identifying A Broken Pin Wire

Broken pin wire can be identified by looking at the print head this way

Take note that normally a broken pin wires can be identified just by looking into the print head as shown above.

Good print wires normally can be seen as bright dots while broken wire as dark dots.

Please bear in mind that it is not 100% accurate to detect a bad print wire this way but it is close enough. To ensure 100% accuracy, we need to open up the print head assemblies and measure them.

By looking into the locations of the print wires on the picture above, we can pin point exactly which is the broken pin wire. In this case, it is G (shorter pin wire)

As mentioned earlier,detection may not be 100% accurate as there might be more broken pin wires inside which is not visible to our sights. For this reason, we need to open up the print head assemblies to find out.


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Step By Step On Disassembling A Print Head

To open up the Epson LQ-2170/ LQ-2180 print head, first you must remove the two screws located at the front of the print head.


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Both screws removed

The red line indicated in the below photos is where the print head is after being detached from its casing.


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To separate the print head from it casing, I have to place a support plate onto the print head casing and then placed it to the pressing tool.

(Note: There might be other ways to open the print head from the casing; picture below indicated the process of how I do it).


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Photo of where the support should be placed.


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The print head assembly is glued to the print head casing by a layer of rubber glue. By using a pressing tool, apply an even pressure from the back of the print head to the circle as shown on the photos.

Adjusting the pressing tool to the print head


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Using a pressing tool to separate the print head from it’s casing.


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Result after the process. The print head assembly dislocated from the print head casing.


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Closed Up photo

Another view


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Side View


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I do not recommend the use of any equipment which needs you to knock the circle surface to get the print head assembly to dislocate from the print head casing as this might easily broke the pin wires or other delicate parts inside the print head assembly.


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As mentioned earlier, there are other ways to detach a print head assembly for the print head casing. Below is a gadget which I just bought from a supplier in China. It detaches the print head with ease and instant. (Thankfully I am able to update this information just in time before the release of this ebook).

A simple gadget to detach a print head


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Just turn lever and it will detached the print head with ease.

See how it grabs both sides of the print head casing


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Another photo of a smaller print head being detached.


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Once you have separated the print head assembly from the print head cover, remove the triangle steel which locked the print head assembly by pressing it on the edge of the steel and pull the lock. Repeat the step with the other two locks. Did you notice that I am applying slight pressure on the print head top cover so that when the 3rd lock are unlocked, the top cover will not pop out.

Opening first lock of the triangle steel


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Opening 2nd Lock of the triangle steel


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Opening 3rd Lock of the triangle steel


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All of the triangle steel locks are opened.


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Print Head 1st and 2nd Assemblies Parts And Functions

Once the triangle steel is opened, gently use a snap blade to peel the top cover. Place the tip of the blade below the washer and open the top cover of the print head assembly.


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Once the top cover is opened, you will see there is 12 long pin wires sitting on top of the print head assembly. This is the configuration for the 1st assembly as mentioned earlier.


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1. Top Cover

Now, take a look at the centre of the top cover. You will see a smaller aluminum washer.

Gently peel away the smaller aluminum washer & you will see another layer of rubber ring. It served as a pin wired cushion. You could also see a layer of transparent ring. There are total of 3 thin layer transparent rings. Its job is to provide a perfect horizontal alignment in the print head assembly as shown in the picture. Note: Increasing and decreasing the numbers of transparent ring could either increase and decrease the depth seating on the pin wires which in turn may create uneven surfaces on the print head.


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The below picture shown a perfect print head alignment. By increasing the transparent ring will caused the pin wire to bolt out from the alignment while decreasing the transparent ring will caused the pin wire being shrunk inside.


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Taking out the aluminum washer

Black rubber ring beneath the aluminum washer


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Below the black rubber ring, is the transparent ring

Taking out the first transparent ring


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Total of 3 transparent rings


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2. Long Pin Wires

OK. Now let’s get back to the print head assembly.

As can be seen, there are 12 long pin wires sitting on the print head assembly. If you refer back to the print head configuration, the 1st print head configuration consists of long pin wires


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Pull out all pin wires and place it on a section of your table.


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Once this is done, you can pull out the whole 1st assembly out by using a snap blade as shown here.


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Pulling the 1st assembly out


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Let’s take a look at all the components that formed a print head assembly.

3. Spring assembly

Spring function is to push the pin wires backward to the original place after they are fired when forming a dot. There are 12 pieces of spring which are held by a circular holder. You can remove the springs by plucking them out one by one from the top.


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or removing the circular ring below by pushing the spring downward


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There is a plate which support the spring on the bottom. Once you push the spring downward, the plate will detach itself from the spring holder.


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The reason for taking out these springs is to see if there is any broken spring. A broken spring need to be replaced as it will affect the efficiency of the pin wires when it fires. A broken spring can also break a good pin wire.


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Identifying a broken spring by placing two spring side by side & compares them.


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Clean the springs and spring assembly by spraying video head cleaner into it and then wipe it with a clean cloth or tissue paper

A clean spring assembly


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4. Solenoid

Solenoid function is to form a temporary magnet which will pull the pin wires forward when a pin wire is fired into the ribbon to form a dot. There are total of 12 solenoids installed below the 1st assembly.

Opening the cover to the solenoids


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Picture of solenoid assembly

One way to test the solenoid is by using a multimeter.

A good solenoid for Epson LQ 2170 is within the range of 17 ohms to 19 ohms if measured on a multimeter. However if you are not sure, I would recommend you to take the majority with the same readings from the multimeter as a guideline. For example, if out of 12 solenoids that you measured, 10 solenoids read around 17.5 ohm (+ - 5% tolerance)& the other 2 read about 5 ohms or 0 ohm then we can safely conclude that the 10 solenoids reading are good while the other 2 are faulty. As there are many Epson print head models in the market, the best solution is to get the majority with the same reading.


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A good solenoid


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Another good solenoid


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A faulty solenoid with a very low ohm reading


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A faulty solenoid with infinity reading (open circuit)

However, based from my experience on repairing print heads, solenoid seldom causes problem or being faulty. But once if you detected a faulty solenoid in a print head, the solution is to change the whole solenoid assembly as you cannot replaced the faulty solenoid alone.

And if you had detected a faulty solenoid, it is good if you check the main logic board of the printer as well. The reason being is because a bad main logic board can cause a solenoid to be faulty thus making the pin wire pin broken.


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How to check printer main logic board

For most all the Epson dot matrix printer, there are 24 transistors that drive the 24 pin wires. This means that for every pin wires, they are controlled by one transistor.

A typical picture of a LQ-2180 printer main logic board


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Picture shown of 24 transistors which controlled the 24 pin wires


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This transistor is a Darlington transistor. The correct ways to measure this transistor is to set the multimeter to X1 and then place the black probe of the multimeter at the pin 2 and the red probe on pin 1 and 3. If the transistor is good, it should not have any reading at all.

Picture shown of black probe at pin 2 and red probe at pin 3 with no reading from the multimeter


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Picture shown black probe at pin 2 and red probe at pin 1 with no reading from the multimeter


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When I removed the print head assembly, I normally placed all the parts vertically like this so when I want to put it back, I know exactly which one to put in first


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Removing the print wires from the 2nd print head assembly

When you have removed the 1st print head assembly, you will see there is a top cover covering the 2nd print head assembly. Basically, removing the 2nd print head assembly is the same as removing the 1st assembly.

Using a blade gently peel off the top cover.

Clean off the glue before opening the 1st print head assembly.


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Place the tip of the blade below the washer and open the top cover of the print head assembly.


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Top cover opened


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Once the top cover is opened, You will see there are 12 short pin wires sitting on top of the print head assembly which is held by a rod so that the pin wires would not drop into the assembly. This is the configuration for the 2nd assembly.


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Taking Out A Broken Pin Wire

There are 12 short pin wires sitting on the print head assembly. If you refer back to the print head configuration, the 2nd print head configuration consists of short pin wires and the broken pin wires number is G. Pull out the pin wire number G and place it in one section on your table. Then pull out the rest of the pin wires and place it in another section. The whole idea again is to separate the good pin wires from the broken pin wires.


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Cleaning all the pin wires

Now, let’s start cleaning all the print wires. First by spraying a video head cleaner to the pin wires and then using tissue paper or a cloth by gently wiping the print wires. Do not apply too much force when cleaning the pin wires as this can break the print wires easily.

A Dirty Pin Wire


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A Cleaned Pin Wire

After wiping all the 12 long pin wires, proceed into wiping the other 12 short pin wires.

After wiping all the 24 pin wires, it’s time to reconfirm whether the pin wires G is really broken.


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Reconfirming a good and a broken pin wires

Let’s confirm status of the short pin wire first. Place the suspected broken wire G next to the good pin wire side by side like this.

The picture below shows that a left pin wire is longer than the right pin wire. The right pin wire was the suspected broken wire G.

Then take a look at the end of the pin wired whether they are of the same length. If the suspected pin wire is shorter, you can confirm that the pin wire G is broken. Then compare the rest of the pin wires using this method to reconfirm if it is a good pin wire or a broken one. Good pins should have equal length when placed side by side with another.

Note: A good pin wires when compare side to side will have an equal length.


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Once you are done checking the short wires, check the long pin wires using the same method.


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Cleaning the Pin wires guide assembly (Applicable for bigger size print head such as LQ-2170, LQ-2180 and LQ- 2190)

After taken out the 2nd print head assembly, what is left is the pin wires guide assembly. Print wires guide assembly consists of 2 parts. Pin wire guide and pin wire guide plate.

Photos of pin wire guide assembly and pin wire guide plate.


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If you see from the top of the print wire guide assembly, there are 6 plates seated vertically. These plates are unique & cannot be mixed or matched with each other. It has to be placed in its original positions. If it is done wrongly, the pin wires will not be able to go through all the plates. Look closely on each plate and you will be able to see there are marking on each plate.


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Cleaning Pin Wires Guide And Plates

Gently pull out all the guide plate starting from the top plate.


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And then placed the plates vertically like this so the chances of them being mixed up are minimized.


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Sample of a dirty plate


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And clean all the plates by spraying them with a video head cleaner and then gently wiping them as clean as possible by using a cloth or tissue paper.


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A cleaned pin wires guide and plates


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Pin Wire Guide Plate Configuration

There are 24 small holes in each pin wire guide plate and these 24 holes are to hold the 24 pin wires together. This configuration is the same as the pin wires configuration.


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After cleaning the pin wire guide plate, the next step is to clean the pin wires holder. Normally dirt is accumulated at the end of the pin wires holder. Just use a video head cleaner & sprays the dirt away.

Once all these are done, it’s time to assemble back the print head.


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How To Assemble back the print head

It is utmost important to align the entire pin wires back into the pin wires guide plate. What I did is by using 4 broken long pin wires which I have collected after years of print head repair.

A picture of a wire which I broke from the holder.


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and insert 2 broken long pin wires into the top left and top right of the pin wires guide plate like this in a plate guide..


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Next I will use another 2 broken long pin wires and insert them into the bottom left and bottom right of the pin wires guide plate like this ….


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Once done, place the pin wires guide back into the pin wires guide holder


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Picture 2: from inside

Place the spring assembly back


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followed by the 2nd print head assembly


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And then gently push the 4 pin back in. You will see the broken pin came out from the 2nd print head assembly through the hole of the spring assembly. If you refer to the print head configuration, the 4 broken pin wires should be coming out to pin wires number 1, 7 and A, G.


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Now it’s a time to place the good short pin wires into the 2nd print head assembly. Starting with B as A was already occupied by one of the broken pin wire. Insert the good pin wire into the spring assembly hole which is nearer to the wall.

(Note: Notice that in the spring assembly, there are 24 holes which 12 holes are nearer to the spring assembly wall and the other 12 holes are situated further from the spring assembly wall. The short pin wires are supposed to be inserted into the 12 holes nearer to the spring assembly wall and the longer pin wires are supposed to be inserted into the holes further away from the wall.)


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As you can see, at the wall of the spring assembly, there are 12 slopes. Insert the pin wires into it.

Inserted pin B


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Checking pin B coming out correctly according to print head configuration.

Then continue with C, D, E & F. Pin number G has been occupied by a broken pin wire. Proceed with H, I, J, K & L. After inserting each pin wire, you need to check if you have placed it correctly by pressing the pin wire and look at the end of the pin wire whether it comes out correctly from the hole according to the print head configuration on page 17.


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Inserted pin C

Checking pin C coming out correctly according to print head configuration.


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Inserted pin D

Checking pin D coming out correctly according to print head configuration.


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Continue to insert the pin wires in E, F, and then H, I, J, K and L. Once you have done that, you can now removed the pin wires from A,G and 1 and 7 and replaced it with a good pin wire for A and G. This is how it looks like when you have finished inserting all the short pin wires.

12 short pin wires inserted to 2nd Print Head Assembly


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Photo showing how pin wires inserted in C,D,E,F, G,H,I,J,K and L and to check if the pin came out from the hole

After all the short pin wires are in its place, adjust the entire pin wires holder to the center and then placed back the top cover.


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Please note that on the print head assembly, you can see there are two holes on the left and right. These holes are to be cupped by the print head cover where there are 2 tiny pins. The function is to secure the print head assembly so it won’t be able to move.


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Once you have placed back the top cover, you now can place the 1st assembly spring holder on top of the top cover.

Please note that the spring holder assembly has a bulge where you can place it on the top cover as shown in the picture below.


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And then place the 1st assembly on the spring holder assembly.


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You now can start to insert the long pin wires into the spring holder assembly starting from 1. Please refer to the pin head configuration.

After inserting pin wire to no 1, check if you have placed it correctly by pressing the pin wire and look at the end of the pin wire whether it comes out correctly from the hole.


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Continue insert the pin wire to no 2

Pin wire correctly coming out from hole no 2


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Insert the pin wire to no 3

Pin wire correctly coming out from hole no 3


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12 pin wires inserted into the assembly

12 pin wires coming out from the hole


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Arrange the entire pin wires rod holder to the middle

Close the top cover


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One you have closed the top cover, lock the triangle steel.


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This is how the print head look like after changing the pin wires. You can see that its surface is uneven & does not look exactly like a new print head. It is still ok as long as you can see the pin wires from the print head. Of course we still need to test it by installing the print head into a printer and then test print it.


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Putting it back to the printer head casing…

This is how it looks like after putting in into the print head casing.


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View from the back…

Tighten back both screws.


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View from the front.


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Cleaning the pin wires guide Assembly (Applicable for smaller print head such as LQ-2070, LQ-2080 and LQ- 2090)

There are some different procedures in cleaning and inserting pin wires into a LQ-2070, LQ-2080 and LQ-2090.

As you can see, for a smaller printer head, there is no detachable print wire guide. The print wire guide plate is attached to the print wire guide assembly.

Here, I will only mentioned the different procedure in cleaning and inserting pin wires into LQ-2070, LQ-2080 and LQ-2090. The rest of the procedure will be the same as LQ-2170, LQ-2180 and LQ-2190

Cleaning the pin wires guide and plates


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To clean the print wire assembly and pin wires guide plate, first of all, take out all 5 pin wires guide plate from the pin wires assembly. Clean them using the same way as cleaning the LQ_2180 print head. Do remember to insert back the pin wires guide plate into its’ original position or else it will be impossible to insert all the pin wires back into the print head.

Picture below shows a correct position of the pin wires guide plate. Please take note of each marking on the pin wires guide plate.


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How to assemble back the print head

You can use the same method as in LQ-2180 to install back the spring assembly and the 2nd assembly. However installing back the pin wire will be a tricky part. You can use the 4 broken pin wire and insert them to A, G, 1 and 7 as in LQ-2180 but I found this method does not guarantee 100% success in installing all the pin wires.

My way is ,instead of using 4 broken long pin wire and insert them to A, G, 1 and 7, I use the 24 broken long pin wires and insert them into the entire 24 pins hole.


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Installing back the 2nd assembly

Pull out the broken pin wire located at A.


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And then insert a good pin wire in to A

Check the pin wire if it is inserted correctly from the outside


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Use the same procedure for pin wire no B. Pay attention from the photo below that you need to skip a pin wire to go for no B. The pin wire between configuration A and B is for 1st assembly long pin wire.

Check if the pin wire correctly came out from outside


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Proceed with pin wire no C

Check again from the outside


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Proceed using the same method; insert all the 12 pin wires into the 2nd assembly. Check from outside if the pin wire are inserted correctly.

Close the 2nd assembly with the top cover


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Insert the spring assembly and 1st print head assembly and start all over the procedure by pulling out a broken pin from no 1 according to the print head configuration, and insert a good pin wire into it. Repeat this procedure until reaching pin 12.

For the rest, just follow the procedure as in LQ-2170, LQ-2180 and LQ-2190.


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Realigning a print head

Before putting in the print head into the printer to test, you need to check or to align the gap between the printer platen and print head. This is necessary because if a print head’s alignment is out, it will caused paper to jam or perhaps no images will be printed on the paper.

To align a print head, take out the card holder.

This is how a card holder looks like…


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Card Holder taken out from the printer…

Place the print head into the carriage assembly…


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Push the paper level forward up to the front…


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Now, look at the side ways of the print head. You will see the gap between the platen and the print head. A good alignment will have a gap around 1mm between the print head and the platen. Anything less, the print head will touch the platen which will results in paper getting jammed as the paper cannot move upward. Any gap more than 1mm will results in blur images in the carbon copy. Example; 4 layers of carbon copy were being printed and the paper level being push to 4 ply of paper.


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If the alignment is off, first thing you need to do is make sure the paper level is moved upfront. (Refer to page 157) and hold on to the paper level. Then loosened the nut beneath the paper level.


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Then adjust the alignment gap by inserting any small rod or screw driver into the hole on top of the carriage rod. Move forward or backward to get the 1mm gap. Once you get the 1mm gap. Hold on to the screw driver and lock the nut back.


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Please be aware, if you turn the carriage rod around, you can see actually there are two types of holes. These two holes do not look the same. This hole must be facing on top


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And this hole must be facing on the bottom. A correct way for a paper level to function is when you push the paper level forward, the gap between the platen and print head will get closer and when you pull the paper level to the back, the gap between platen and print head will get wider. If you mix match these two holes, it will give a reversal effect on the paper level.


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How To Get Parts For Print Head

Once you have gone through all the information on how to repair or refurbishing a print head, the ultimate question will be, ‘Where can I get a good print wire?’

If you search through websites like Google on buying print head pin wire, I’m sure there are plenty of places that can you buy from.

For your information, below photo are new pin wires which I bought from Shenzhen, China for my own research on their durability and reliability. The price is about USD45.00.

However my preference will be on buying all the old print heads from recycle or printer repairing centers. (Make sure there are more good pin wires than bad ones before buying).From this old print heads, I will take out the good pin wires. How reliable are pin wires taken out from the old print head? Out of 100 units of print heads that I refurbished, there are about 2-3 units returned back .This can be considered a very good investment as not only I can get good pin wires, I can also salvaged other parts from this print head. These salvaged parts can be used to replace other faulty parts, others than pin wires.


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Words From Author

My sincere hope is that this ebook will help you to start your journey into print head repair. It is not a difficult task to repair a print head but what it does required is a lot of concentrations and also a fairly good eye sight. If you encountered any problem related to Epson print head repair, you can always email me at [email protected]

Thank you And God Bless….


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This is a Projection TV Repair Membership site. Its provides training manuals, schematic diagram, service manuals,

troubleshooting and repairing information, service bulletins, lamps assembly information,

firmware and many more for more than 400 types of brands and model. It is recommended to

anyone who are into Projection TV repair.


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My Review:

This ebook comes with 195 pages of comprehensive guide with

photos. It is suitable for beginner in electronic s repair.


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137

My Review:

This is the compilation of common fault on LCD TV makes and models. Based on the author encounter with LCD TV faulty symptoms and his

solutions. It is good ebook as a guide for LCD TV repairer


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print head repair secrets - william hor

Documents

print head assembly

broken print head

print head assemblies

dot matrix print head

broken pin wire

long pin wire

pin wire guide plate

imaginex electronics2