How to fix a defective print head on canon i850

ORANGE LIGHT FLASHES

2 times - No paper (ASF) [1000]
* No paper in the cassette [1003]

3 times - Paper jam [1300]
* Paper jam in the rear guide [1303]
* Paper jam in the under guide [1304]
* Front door closed [1250]

4 times - No ink [1600]
* Ink tank not installed [1660]

5 times - The print head is not installed [1401]
* Print head temperature sensor [1403]
* Faulty EEPROM data of the print head [1405]

6 times - Inner cover open [1841]
* Inner cover open (while printing) [1846]
* Inner cover open (printing continuous) [1851]; (printing not continuous) [1856]

7 times - Multiple ink tanks of the same color installed [1681]
* Ink tank in wrong position [1680]

8 times - Warning: The waste ink absorber becomes almost full [1700]

9 times - The digital/video camera does not support Camera Direct Printing [2001]

10 times - Automatic duplex printing cannot be performed (paper size not supported) [1310]

11 times - Failed in automatic print head alignment [2500]

13 times - The remaining ink amount unknown [1683]

14 times - Ink tank not recognized [1684]

15 times - Ink tank not recognized [1410 to 1419]
* No Blinking Access cover open [1200]

16 times - Valve sensor [6C00]

ORANGE / GREEN FLASHES

2 times - Carriage [5100]
3 times - Line feed [6000]
4 times - Purge cam sensor [5C00]
5 times - ASF (cam) sensor [5700]
6 times - Internal temperature [5400]
7 times - Waste ink absorber full [5B00]
8 times - Print head temperature rise [5200]
9 times - EEPROM [6800]
11 times - Carriage lift mechanism [5110]
12 times - AP position [6A00]
13 times - Paper feed position [6B00]
14 times - Paper feed cam sensor [6B10]
15 times - USB Host VBUS overcurrent [9000]
17 times - Motor driver [6D00]
18 times - NIC Board [6550]
19 times - Ink tank position sensor [6502]
20 times - Other hardware [6500]
* Alt. Blinking ROM
* Light in Orange RAM

SERVICE MODE
This printer has a service mode for service-related settings and for performing test prints. The operator panel buttons are used to enter the desired service mode.

Service Mode Operations
1. With the printer powered off, hold down the Resume/Cancel button and press the Power button.
2. While holding down the Power button, release the Resume/Cancel button and press the Resume/Cancel button twice in succession. Now release the Power and Resume/Cancel buttons.
3. Select one of the following service mode functions by pressing the Resume/Cancel button the specified number of times.

Count Indicator Functions
• 0 times Green Print head not installed, carriage returns and locks in home position
• 1 time Orange Service test print
• 2 times Green EEPROM information print
• 3 times Orange EEPROM initialization
• 4 times Green Waste ink counter setting
• 5 times Orange Destination setting
• 6 times Green Print head deep cleaning
• 7 times Orange LF correction
• 14 times Green Left margin correction

Execute the selected function (except for model setting) by pressing the Power button. The printer will switch itself off after performing the function.