How to solve error B300 on Canon printers

Error code B300 concerns these Canon printers: MP7600, IX7000, MX7600...
Sometimes there is a message like "cancel printing, shut down the power and try again. If it doesn't work, call Canon service".

Alarm and power leds blink 8 times. Error B300 is a reactor error: a hardware error in supply of the ractor liquid


Solutions 1:

• Power off the printer.
• Disconnect the power cord from the electrical outlet.
• Hold down the power button and Wait one minute.
• Reconnect the power cord to the electrical outlet.
• Switch on the printer.

Solution 2:

• Power off the printer.
• Disconnect the power cord from the electrical outlet
• Wait for ten minutes.
• Reconnect the power cord to the electrical outlet.
• Switch on the printer.

Solution 3:

• Clean the ink cartridges contacts.

Solution 4:

• Open the printer and wait for the carriage to slide over.
• Remove the ink cartridges.
• Clean the print head with cotton swabs dipped in hot water.
• Once finished, allow to dry the printhead.
• Replace the cartridges

Solution 5:

• Replace the valve unit

Solution 6:

• Replace the sheet feed unit

Links:

• QY6-0066: Printhead Canon for  IX7000, MX7600, MP7600
• QM3-5358: Sheet feed unit IX7000
• QM3-1948: Sheet feed unit MX7600
• QM3-5339: RCT Pump Valve