Canon PIXMA iP4820 On-Screen Manual - Page 387
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Alarm Lamp Flashes Orange Nineteen flashes: An unsupported USB hub is connected. Page 387 of 468 pages the printer. If you want to continue printing in this condition, you need to release the function for detecting the remaining ink level. Press and hold the printer's RESUME/CANCEL button for at least 5 seconds, and then release it. With this operation, releasing the function for detecting the remaining ink level is memorized. Please be advised that Canon shall not be liable for any malfunction or trouble which may be caused by continuation of printing under the ink out condition. Note If the function for detecting the remaining ink level is disabled, the ink tank is displayed in gray on the printer status monitor. Routine Maintenance If a PictBridge compliant device is connected via a USB hub, remove the hub and connect it directly to the printer. Page top
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