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Error code ##345 = "BJ cartridge head cleaning error" -reasons for this are: -Foreign material or dried ink in head cleaning unit (also known as "purge unit") , or waste ink pump jammed up. Make sure waste ink pump rotates freely, after cleaning. Clean the waste pump-hose too! Waste ink pump is located under head cleaning system.
Short solution: 1.Take apart and wash the ink clogged mechanical parts. Use hot water. 2. Reset waste ink counter
purge unit: HM1-0723-000
see more parts: http://www.e-parts.fr/pictures/uploaded/files/MP_360_370.pdf
"waste tank full" alarm; you may need to reset the waste tank counter.
Try: Resetting the Waste Ink Volume Counter 1) Enter SERVICE MODE.--- By pressing Menu-Copy-# 2) Select TEST MODE. 3) Select  PRINTER TEST in TEST MODE. 4) Select 3. [EEPROM CLEAR]. 5) Select 0. [INK COUNT]. 6) Press the [OK] key. 7) Press the [Stop/Reset] key (returning to the state of 3)), and then press the [ON/OFF] key.
hi I don't know if you have the same problem as me but my printer kept saying cartridge jammed so I opened it up and moved the cartride head gently to the left and got a flash light there is a little peice of metal on the base where the cartridges sit you have to make sure it is cliked back in and now mine works again. I hoe this helps