Details
Errors
- AOM Driver
- Temperature
- Synchronouos Sensor
- B / G Laser Errors
- Yellow Shift
- Optical Noise
- Weak Green Gun
- Red Laser
- Polygon Mirror
- Affected Prints
- Funny Stuff
Instructions
Forms
Blue Laser weak:
Laser gun isn't an Edison lamp. The emission of aged laser gun is going down slowly, sporadically flashing or changing output up and down. Laser Driver PCB follows that jumping of emission and maintains the factory preset output level by electric current (mA). Some people say why do they have to repair their units, if they are still working few hours before the error comes? They consider that problem is somewhere else. However the process of aging is a long process and can be running years and years. The very first statistic for QSS3001 minilabs shows that Laser unit must be exchanged for every two years (or 5000 hours). Than we have another experience. Some of QSS3001 even 2001 year of production is still working fine without opening a Laser Cover. Some other asked for Repair Exchange under warranty during first year of service. There are so many combination of life and dead of laser guns and units. we consider generally guns are fine for 3-4 years, then the process of aging is launched. It may takes from 3 months up to 2 years. During this period the emission of the aged gun isn't stable and number of symptoms described in this article may appear.
Good point to review the condition of BLUE gun on QSS32-35 Series machines. Just print this Alignment pattern and look at it through a 10x lens. If you see "mountainscape" yellow line instead a straight line. Sometime the output power of Blue gun is still enough for good printing but AOM crystal generates smooth dot and scatters coherent light due to optic fatigue. Laser Unit repair is required.
"Yellow shift" problem
This is another confirmation of the same problem of weak Blue. It's common to be seen on QSS32-35 Series laser units. For the same condition of Blue beam QSS30-31 Series machines give us Synchroerror, but sensors in 32-35's can detect weaker beams even if loosing the right clocks. Laser repair required.
However there is at least one known exerption: please check small 4-pin digital connector on BLUE AOM driver is properly connected.
Yellow Lines
This one is the first call of optic fatigue in your AOM crystals. Yellow lines can appear just few times per day. No big worries, the small batches of prints will be thrown into the trash basket and so far that's all. But if you disregard this symptom, "Yellow shift" problem will follow. You can try to postpone repair while putting of the brand new AOM Driver in the BLUE channel. It doesn't mean that old one is bad, but amplifying factor of a brand new one is higher, what may temporarily help to overcome the problem. However Laser Unit repair is required. Below is a rare capture of this problem on test pattern:
Then, when first calls will develop into the Yellow shift problem, this test pattern will look like this:
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