It is necessary to define exactly which part
of the optical section is faulty.
In some cases it is not so easy.
Only experience and a good source of information
will help you to save your time. And money.

Laser section's main components are as follows:
1. Light source
2. A.O.M. driver
3. A.O.M. (crystal)
4. Optical surfaces [mirrors, prism, etc]



Light source

Light source is a Laser located inside of a laser optical unit. It designed on laser diode or DPSS basis (diode pumped solid state).
Some people call it : "laser gun or laser head".
More correct to name it as a Laser Module. See above to understand how it looks like. Here you can see a laser module of type A1.

The symptoms of faulty laser module are as follows:
Light Source Status Error #### (in Noritsu minilabs)
Stripes (inclined also), ripples, noise and synchronous sensor error (sometimes)
Changing (or swapping) of A.O.M. drivers do not affect to the result (see below)

Also judging on the color of the stripes you can understand what laser module is faulty.

For example:
If you have yellow-blue ripples/stripes - Blue laser module might be faulty.
If you have green-magenta ripples/stripes - Green  laser module  might be faulty.
If you have red-cyan ripples/stripes (very rare case) - Red  laser module  might be faulty.


In this case you need to repair your laser module or replace it with new one.
If you apply to us as a lab owner and you know exactly the type of the laser module and part name of the laser driver - we recommend to buy the upgraded original laser module from us.
If you apply to us as a service center and you do not know exactly what laser module will die next at your customer - we recommend to order universal laser module from us. Yu can keep on shelf uncertain time because there is no warranty period expire. Warranty period starts from the date of the first start of the laser so the universal laser is the perfect choice for service centers.

Both of them are based on semiconductor laser diode basis and have the same design.
We produce and sell them worldwide with a great success and if you want to know more about it
click here  please.


A.O.M. Driver

looks like this

1. Converts the image data to the signal for the A.O.M. (Acoustic Optic Modulator) element.
2. Controls A.O.M. (Acousto Optic Modulator) element.

A.O.M. drivers are the most unreliable components in the laser section.
Some of our customers have to change it a few times during the lab's life.
A.O.M. driver is to be checked first to exclude of its influence to the unexpected problem especially if there is no error appears.
If you sick and tired to change them every six month we recommend to obtain new AOM driver of our design with "stand-by mode" and save a lot of money in the future. Read more here.

Here some examples of defective AOM drivers:
1. Blue AOM driver is defective (if you swap AOM driver of a blue channel with AOM driver from a green channel you will get green stripes)

AOM driver of a green channel is defective - no modulation at all.
2. Green laser beam fills all the paper surface (sample below)


AOM driver of a blue  channel is defective - no modulation at all.
3.Green laser beam fills all the paper surface (sample below)


I will try to add some more pictures later...


A.O.M. Driver Swapping

Swapping is a method to localize the problem and find a faulty part by means of "exclusion" procedure.
All Noritsu A.O.M. drivers are compatible with each other and can be swapped to determine the faulty one.

Reasons for swapping:

1.You have color stripes across the picture from top to bottom (see above please).  
2. Weak density of a certain color.
3. Synchronous error.
4. Instability of colors.
After adjustment a certain color changes and you have to adjust the lab again and again.
5. Time of adjustment and quantity of adjustments exceeds the normal level (usually you have to make more than 1-3 repeats).   

Now you need to determine which A.O.M. driver is faulty:

If Blue A.O.M. driver is defective you will have:
blue-yellow stripes,
bluish maximal density,
image changes from yellowish to bluish and vise versa  and you have to make readjustments
Synchronous sensor error (see last digits)

If Green A.O.M. driver is defective you will have:
green-magenta stripes,
greenish maximal density,
image changes from greenish to magentish and vise versa  and you have to make readjustments
Synchronous sensor error (see last digits)

If Red A.O.M. driver is defective you will have:
red-cyan stripes,
reddish maximal density,
image changes from reddish to cyanish and vise versa  and you have to make readjustments
Synchronous sensor error (see last digits)


How to swap::

1. Power Off the lab by the main switch.
2. Open the cover and get access to the laser section.
3. Swap a suspicious A.O.M. driver with any other A.O.M. driver.

It is easy to get access to the AOM drivers in qss 30, qss31, qss33 but a bit complicated in qss32 labs.
Please download the small step-by step instruction here how to get access to that area
> download<

Important Notes before swapping:

1. Pay attention to the INPUT and OUTPUT wires connection! They have same connectors and may be easily wrong connected.
Do not connect OUTPUT into INPUT otherwise you will have Laser Control PCB defective.
To avoid it just attach stickers with OUTPUT and INPUT marks to the corresponding cables.
2. Do not forget to mark the AOM drivers first to know where their original position was BEFORE SWAPPING

4. Switch ON the lab and make test. Look at the test:
- if you have no changes or you have just a little colour shift (easy removing with adjustment) it means that your suspicious A.O.M. driver works well and you should proceed with search of the cause of issue.
- if stripes, maximal density and synchronous sensor  error changed - problem with your suspicious A.O.M. driver. Buy the new one at us.

- if you have the same problem with no changes and you have swapped all A.O.M. drivers with no result - it means that the problem is inside the laser engine or A.O.M. crystal.
Call or write to us and we will help you to get your laser unit in perfect condition.


A.O.M. (crystal itself)

A.O.M. (Acousto-Optic Modulator) - one of the most important component of the laser engine. This device adjusts the strength and weakness of laser light and forms the image.
A.O.M. crystal is located inside the laser unit and is a subject for repair only by authorized and trained personnel.

Fujifilm and Noritsu labs have 200 Mhz AOM crystals made by Panasonic.

Do not open the laser unit and disassemble A.O.M.
This is extremely precise device and it has no parts inside for end-user service.
They have fixed position and can not be moved by the end-user.

A.O.M. is not a part to be replaced by yourselves.
Here we just want to help you to understand how to distinguish the issue of A.O.M from the other parts.

The symptoms of faulty A.O.M. are as follows:

Fog / Indistinct stripes along the direction
Weak maximal density (reddish, greenish or bluish hues)
Lab requires many repeats of adjustments and sometimes can not be adjusted.
A.O.M. driver fails very often
Synchronous sensor error

How to localize:

If you know exactly that A.O.M drivers are in working condition but you have all symptoms of faulty A.O.M. driver -
may be your AOM crystal is out of order and the whole unit should be revised by our technicians.


Optical surfaces condition


Optical surfaces are all surfaces of laser mirror, prism, lenses etc. 

The symptoms of faulty optical surfaces are as follows:

- Fog on prints
- Distinct and indistinct lines along paper feed direction
- Synchronous sensor error

All optical components inside of the laser unit have very high level of accuracy. Any non qualified interference can lead to their damage. 

Some errors and issues of a laser unit is a result of broken or moved internal optical components.
If you suppose that the problem of your laser unit is in optics we recommend not to open the laser unit and interfere inside. Please ask a Noritsu or Fujifilm certified technician to open the laser unit and inspect the condition of the optical parts. 
Also it is better to invite the person who certified by Noritsu or Fujifilm to perform any cleaning and service actions.

Never use alcohol or alcohol contained liquids for cleaning.
Never use the special liquids for optics cleaning. This solution will harm your laser unit's optics. 
Use clear water.
Any works  on the laser unit must be done in a clean room to avoid dust contamination.


If after all localization procedures you still have the same issue - most likely your laser unit is faulty and a laser repair required.




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