Instruct: Classify Amazon reviews into positive or negative sentiment
Query: piece of junk, nothing works if printer doesn't work

The MP830 turned out to be an expensive piece of junk. As I am not a heavy printer user, and although I have been warned by a colleague to use the inkjet from time to time so that the cartridges wouldn't dry up (which I did, but apparently not frequently enough), the printer stopped working, the unit produced an error (5200) each and every time I turned it on, and refused to do absolutely anything (faxing or scanning included) unless I fixed it (which is hard to do, the error wouldn't just go away after replacing the ink cartridges, and I am still jumping through hoops trying to do a deep cleaning of the print head). To say the least, it is very frustrating not to be able to send a fax or scan a document when only the operation of the printer is affected by the cartridges. Canon just lost a customer, this is simply bad engineering.