If your PIXMA TR8620 doesn't respond when attempting to use the touch screen, please check the following.
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After unpacking the printer, is there a protective film that is still on the touch screen?
This protective film is attached to the touch screen at the time of purchase.
Peel it off before you use the printer.
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Is a protective film or sticker attached on the touch screen?
If a protective film or sticker is attached to the touch screen, it is possible that you cannot operate the printer properly.
Do not attach any protective films or stickers on the touch screen.
If your product issue was not resolved after following the steps above, or if you require additional help, please create or log in to your Canon Account to see your technical support options.
Or if you still need help, visit our Canon Community by clicking the button below to get answers:
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