Check Canon PIXMA MG7720 Manual to get detail about different types of ink cartridges installation and usage. From that it will be clear to you what are pros and cons of using single and multiple ink cartridges.
Basically imaging unit is kind of drum in printer which is an essential component in any laser printer and it is used to transfer ink to the page in the printing process. You can get imaging unit for your printer model at any e-commerce shopping site such as amazon etc. After receiving it you need to replace it with old one. For that purpose check Samsung CLX-3305FW Manual to see instructions about imaging unit replacement.
Just go to official HP printer website. Search for your model number . Download the drivers for your printer which are newly latest and well suited for your operating system. Check HP Envy 7640 Manual for details.
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I recommend you to check canon mx922 manual . This manual is perfectly designed for those people who are just new for this model. It states detailed description , step by step guidance and properties of Canon pixma mx922 . I hope you will get answer from this user manual.
Please do not worry, we met the problem before, pleas try to solve the problem as below solution first.
Please read through the following information if you are experiencing problems with your toner cartridges.
Take out the cartridge from your printer first and turn off your printer for a minute.
Please make sure all the sealing tapes are removed.
Redistribute the toner: open the printer and remove the cartridge from the printer. In order not to damage the toner cartridge, we recommend not exposing the cartridge to the light for long (no more than a few minutes.) While exposed, cover the cartridge with a piece of paper or cloth. Rock the toner cartridge from side to side gently so that the toner redistributes inside the cartridge. (Be sure to shake the toner cartridge gently. If you do not shake the cartridge gently, toner may spill out.)
Turn your printer back on and reinstall the cartridge
Try a test page & verify the quality of the printout.
If you are still having this problem, please let us know .
The only thing you need to do is tightening the screw (part #5, on the following illustration) through the screw holes(part #4) to the mouse board screw hole(part # 8).
Inline image 2
There are two other parts, anti-skid chains(part # 9), are not for mouse board installation,
they are used on the edge of the desktop (need to press the clip firmly then install this chain on the desktop).