Question about Canon i850 InkJet Photo Printer

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Red streak poor color

Red streak threw the bottom of picture color blown out and blurry?? need help fast

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If streaking is occurring only at the bottom of the page (i.e. the last area to print as the paper is fed beneath the print head), the problem may be due to improper curl of the paper. Many inkjet printers (Canon especially), rely on a slight curl of the paper so that it is "bowed" when it travels beneath the print head.

To see if this is the problem, gently roll a sheet of paper so that the print side is on the outside of the roll. When you place the paper in the feed area, it should have a very slight bow so that the center of the print side is slightly raised off the surface, while the edges are on the surface.

Also, make sure you use only OEM (Canon) cartridges. There is not a single "compatible" cartridge in the world that won't screw up your Canon print head. Take my word for it (and I DON'T work for Canon), you must use only Canon cartridges.

Posted on Jan 21, 2008


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Hello paulaspec,

You have a problem with the three factors, and they are screen voltage, focus voltage, and control (focus 2) voltage. Basically these voltages have to be adjusted since the components in this section have aged some. These controls are usually located in the television on the IHVT (Integrated High Voltage Transformer) or as it is also called the flyback transformer. these controls must be adjusted together, along with the color controls. Here is how the adjustment is done (You will need a schematic diagram, a DC volt meter, and a color bar generator to do these measurments):


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4) measure the voltages on the focus, screen and control grids of the CRT and match them to the schematic digram measurements.


5) adjust the focus screen and control grids to match the ones on the schematic diagram


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This should help if the CRT (picture tube) electron guns are still good and if the flyback transformer voltage supply is working.


However if you do not have a background in electronics please take the TV to a shop for repairs.


I hope this helps,

Thank you,


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