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This won't be a technical review as I haven't done any test pages and timings and I don't have enough technical knowledge to write an in depth technical review. It's written purely from a home consumer point of view but I hope it will be helpful.
I bought this multifunction machine a few years ago and I haven't been disappointed with it. I've used it on a regular basis for printing, copying and scanning but I've never had the patience to work out how to use it as a fax machine.
The best function for me is the ease of photocopying documents. You can use it just like an office photocopier. It is literally as easy as putting the document on the platen and pressing a button. You can copy in black and white or in colour.
The Pixma 830mp offers two paper feeders, one from a tray underneath and one at the back of the machine. Switching between the two is easy. It also has a 35 page automatic document feeder so that you can leave it to process quite large documents.
I have never set up the fax side of the machine but in theory I should be able to fax directly from the computer. I did start to do this once but failed due to lack of patience and understanding.
Using the MP830 as a printer is easy and you can print in colour or black and white and on one side of the page or on both sides. The print quality is excellent. If you want to print photos you can use your memory card or there is a pict bridge. I just connect to my pc and print out the photos. The quality of the printing is excellent with a good colour balance. The scanning function is also simple to use and produces good quality images. The printing speed is fast as well.
Setting up the mp830 is easy and you can have the machine installed and running without too much frustration. It is quite a bulky printer and it's quite heavy and I wouldn't recommend it if you're short of space. You may need to get at the back of the machine for unjamming or just to use one of the sheet feeders.
I keep a copy of the very detailed user manual on my laptop but I find the Pixma mp830 quite intuitive to use. There is an LCD screen on the front which has all the menus and functions and you can just flip through it until you find the settings you want. It can be confusing at first but if you refer to the manual you should be able to work out how to use most of the functions in a relatively short space of time.
Now for the running costs. There are five separate ink cartridges, cyan, magenta and yellow, plus two black cartridges. One of these is a dye-based black for photos and the other is a pigment-based black for text. If you buy Canon original cartridges they will cost you an arm and a leg. A full set is likely to cost £50 to £60. They last a long time but even so it is overly expensive. I buy my ink from ebay. The cartridges are refills. They're fully chipped and I can get the full set for around £10. I've never had a problem with this but maybe I've been lucky.
I would highly recommend the Canon Pixma mp830. I'm giving four stars because the speed and print quality is so good and I love the photocopier and scanning. It loses a star because the bulkiness of the machine is a down side for me and I haven't been able to set it up for use as a fax.
Please note: If you want a detailed technical specification you will be able to find this on the Canon website. I haven't reproduced it here as it is very lengthy and very detailed and I don't understand half of it.