i can say i am the most professional on canon inkjet
B200 is Dead Head
It occurs mostly using ciss and not good ink or head life has ended printed more than 20K
when the b200 occur maybe you can run the printer but after 200 print it will shows again and not solve till buy new print head
i prefer the 4950
7240 head mechanism is some how that PGBK nozzle break too early
also 4950 has more speed of cd/dvd printing and more speed of monochrome printing using PGBK
Good luck
B200 is Dead Head
It occurs mostly using ciss and not good ink or head life has ended printed more than 20K
when the b200 occur maybe you can run the printer but after 200 print it will shows again and not solve till buy new print head
i prefer the 4950
7240 head mechanism is some how that PGBK nozzle break too early
also 4950 has more speed of cd/dvd printing and more speed of monochrome printing using PGBK
Good luck