the power light on my canon tr4720 just flashes orange and it won't do anything at all.

Diagnosis

The flashing orange power light on the Canon PIXMA TR4720 is a critical status indicator signaling that the printer's internal logic has detected a "Service Error" or a physical obstruction. Unlike a steady orange light, which usually indicates a simple "out of ink" state, a flashing light means the printer cannot complete its startup sequence or maintain a safe operating state. This is typically caused by a failure in the carriage movement, a sensor malfunction, or a communication error between the print head and the motherboard. To confirm the exact cause, look at the small LCD screen on the front panel. The flashing light is the general alarm, but the screen will display a specific alphanumeric support code, such as "E03" (Paper Jam), "P02" (Cartridge Error), or "5B00" (Waste Ink Absorber Full). If the screen is completely blank while the light flashes, the issue is likely a power supply failure or a catastrophic motherboard short, often caused by a piece of conductive debris or a leaked ink cartridge touching the electronic contacts.

How to Fix It

Follow these steps in precise order to clear the error and reset the hardware:

1. Perform a Hard Power Reset: While the printer is on and flashing, pull the power cord directly from the back of the machine. Unplug the other end from the wall outlet. Wait exactly 120 seconds to allow the capacitors on the mainboard to discharge fully. Plug it back in and power on.
2. Clear the Paper Path: Open the scanning unit/cover. Gently slide the print carriage to the center. Check for any torn scraps of paper, staples, or dust bunnies in the far left and right corners of the carriage path. Open the rear tray and check for any skewed paper. Ensure the Automatic Document Feeder (ADF) tray is pushed completely flush against the chassis.
3. Reseat the Ink Cartridges: Open the access door. Push down on the PG-260 (Black) and CL-261 (Color) cartridges to release them. Remove both cartridges and use a lint-free cloth dampened with distilled water to gently wipe the gold electrical contacts on the back of the cartridges and the corresponding pins inside the carriage. Re-insert them firmly until you hear a distinct click.
4. Verify Cover Closure: Ensure the scanning unit cover is snapped shut tightly. If the hinge is slightly loose, the sensor will not register the cover as closed, triggering the orange flash.

If That Didn't Work

• Check for "Ghost" Jams in the ADF: Sometimes a tiny piece of paper is stuck in the Automatic Document Feeder rollers, which doesn't trigger a "Paper Jam" message but causes a general hardware error. Open the ADF cover and use a can of compressed air to blow out the rollers and the sensor flags.
• Reset the Ink Counter: If the error code is 5B00, your waste ink absorber is full. While this usually requires a professional technician, you can sometimes bypass this by entering "Service Mode." Power off the printer, hold the Stop button, then hold the Power button. Release Stop while still holding Power, and press Stop five times rapidly, then release both. If the light turns green, the counter has been reset.
• Inspect the Encoder Strip: Look for a thin, clear plastic strip running horizontally across the width of the printer behind the carriage. If this strip is smeared with grease or ink, the carriage doesn't know its position and will flash orange. Carefully wipe it with a dry cotton swab; do not use alcohol as it can strip the timing marks.
• Test a Different Power Source: The TR4720 is sensitive to voltage drops. If you are using a surge protector or power strip, plug the printer directly into a wall outlet to rule out insufficient amperage causing a boot-loop.

Heads Up

• Avoid using "generic" or "refilled" cartridges that leak; ink seepage into the carriage electronics is the leading cause of permanent motherboard failure on this model.
• Never pull paper out of the printer from the front; always pull from the rear or the ADF to avoid bending the internal plastic guides.
• Keep the printer away from humid environments, as the TR4720 sensors are prone to triggering false "paper jam" errors when moisture affects the paper feed rollers.
• Run a "Nozzle Check" once a week even if you aren't printing frequently to prevent ink from drying and causing carriage movement resistance.