It dont print and say service error 5100 - Canon PIXMA iP1800 InkJet Photo Printer

SOURCE: Service error 5C00 or 5100

5100 Make sure nothing is blocking the cartridge movement, if not requires service.

SOURCE: Service error 5100 on my canon Pixma mp110

just replaced the ink cartridges and reset the counters, evrth ok now :-)

SOURCE: regarding service error 5100 in canon ip1880 printer

1. Try to reset the ink counter by iptool software (sometimes it help)
2. Unplug the usb cable and then turn off and on your printer for a few times.
service error 5100 seems like indicating of mecanism exhausted or out of buffer ram in the printer. You should reduce the amount of pages to print at one time.
Good luck.

SOURCE: My Pixma ip1980 service error 5100

5100 is a Carriage Home Position Error.
try cleaning the plastic strip that runs the length of the carriage, it may be contaminated.
Use alcohol and a swab.

SOURCE: CANON IP 1300 SERVICE ERROR 5100

ERROR 5100 means that there is some foreign object blocking your ink cartridge carriage that disables it from moving. It may be a piece of paper or a scotch tape or a staple wire. You may try cleaning also the encoder strip with a moist tissue paper. Furthermore, you may also try cleaning CAREFULLY the contact points of the cartridge holder and the cartridge itself (those shiny bronze pins) with a moist lint-free cloth.