Flashing orange light - Canon PIXMA iP3500 Printer

Amazing hacks to troubleshoot Canon printer errors 1401, 1403, 1405 :
This particular error code occurs when the printhead is probably broken.
§At first, you need to remove the cartridges and the printhead.
§Next, unplug the printer from the power source and wait for a minute.
§Turn on the printer and reinstall the printhead and the cartridges.
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Cannon pixma 3500 Flashing orange light count the blinks for the error,

5 flashes? This is consistent with any of error codes 1401, 1403 and 1405. It indicates a problem with the print head. From Canon error page:

1401/E05 - Orange light blinking 5 times
Description:
The print head is not installed or has not been properly installed.
Resolution:
Resolving this error requires the assistance of a Canon authorised service facility. Please use the link at the top of the page to locate your nearest facility.

1403 - Orange light blinking 5 times
Description:
A print head temperature sensor error has occurred.
Resolution:
Resolving this error requires the assistance of a Canon authorised service facility. Please use the link at the top of the page to locate your nearest facility.

1405 - Orange light blinking 5 times
Description:
Faulty data of the print head.
Resolution:
Resolving this error requires the assistance of a Canon authorised service facility. Please use the link at the top of the page to locate your nearest facility.

http://www.canon.co.uk/support/consumer_products/product_ranges/printers/pixma/error_codes/