https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/unable-to-register-my-TS6420a-printer-with-serial-number-that/m-p/560421#M80092 <P>Hi, bjmcadam!&nbsp; Our database shows that serial numbers beginning with KRHR correspond to the PIXMA TS6420a, specifically black units sold in the United States.&nbsp; If you're based in the US and you bought this from a dealer in the US, we recommend double-checking the serial number and trying again.&nbsp; The serial number should consist of the 4 letters followed by 5 numbers (e.g. KRHR12345).&nbsp; If the number doesn't follow that format, your registration won't accept it.<BR /><BR />If you continue to have trouble, please give our PIXMA support team a call at 1-800-OK-CANON (1-800-652-2666) and they'll be glad to investigate further.&nbsp; You can reach them Monday through Friday.</P> <P>Have a great day!</P> Fri, 18 Jul 2025 13:49:32 GMT Danny 2025-07-18T13:49:32Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/unable-to-register-my-TS6420a-printer-with-serial-number-that/m-p/559758#M80088 <P>I cannot register my TS6420a printer with a serial number that starts with KRHR, error message returned says it is not found.</P> Thu, 17 Jul 2025 18:31:50 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/unable-to-register-my-TS6420a-printer-with-serial-number-that/m-p/559758#M80088 bjmcadam 2025-07-17T18:31:50Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/unable-to-register-my-TS6420a-printer-with-serial-number-that/m-p/560421#M80092 <P>Hi, bjmcadam!&nbsp; Our database shows that serial numbers beginning with KRHR correspond to the PIXMA TS6420a, specifically black units sold in the United States.&nbsp; If you're based in the US and you bought this from a dealer in the US, we recommend double-checking the serial number and trying again.&nbsp; The serial number should consist of the 4 letters followed by 5 numbers (e.g. KRHR12345).&nbsp; If the number doesn't follow that format, your registration won't accept it.<BR /><BR />If you continue to have trouble, please give our PIXMA support team a call at 1-800-OK-CANON (1-800-652-2666) and they'll be glad to investigate further.&nbsp; You can reach them Monday through Friday.</P> <P>Have a great day!</P> Fri, 18 Jul 2025 13:49:32 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/unable-to-register-my-TS6420a-printer-with-serial-number-that/m-p/560421#M80092 Danny 2025-07-18T13:49:32Z