Canon iPF9000S Troubleshooting Manual page 127

5) non-ejection1. Regularity in a line
[Conduction Check]
Flat Cable (long) disconnection
check between Aand B in 3)
T18
per 2 nozzled
per 16 nｏｚｚｌｅs
per 40 nozzles
Chapter 4 Fault Isolation Tool Collection
No
4-7
Replace the Flat Cable
Yes
Replace the Print Head
Replace the carriage PCB
Replace the carriage Unit
Replace the main controller
per 8 nozzles
per 32 nozzles
per 64 nozzles