Canon iPF9000S Troubleshooting Manual page 83

Flow 2
Fault isolation for the multisensor failure to illuminate
Check for Vh (normal value: 21.5V) on the
iPF5000 Series
main controller while paper is feeding
iPF700 Series
Check the short flexible cable in the
iPF800 Series
multisensor and reinsert it
iPF8000 Series
■ How to measure Vh (Printhead drive voltage)
Model
iPF5000 Series
iPF700 Series
iPF800 Series
iPF8000 Series
IC601
IC602
IC603
IC1
IC604
IC1201
Flow 3
Point to check when paper fails to reach the multisensor
Check the leading Leading end stuck under
end position of paper the LF roller
Leading end of paper not
passing between the LF
roller and pinch roller
Flow 4
Check the relay board
carriage
flat cable (short) for connection
iPF700/iPF8000 Series only
Normal
Measurement point
Main controller J1801-3
Measurement at finely pitched IC pins is impossible.
IC802 IC802 IC803 IC803
BAT801 BAT801
IC701
IC3101 IC3101
IC2
IC2801 IC2801
IC2901 IC2901
IC3001 IC3001
Feeding failure caused by
paper dust
Nipping failure
Feeding failure caused by a
short nip pressure
the carriage relay board
Replace
Abnormal
Chapter 4 More Sophisticated Fault Isolation Tasks
Replace the power PCB
Abnormal
Replace the multisensor after making
sure it is improperly mounted
Replace the multisensor reference plate at the same time
Measurement timing
While feeding paper
(multisensor illuminating)
J1801 pin 3
Remove the cause of curling
of the paper
If the leading end of the paper
is shaped improperly, check
the cutter
Remove LF roller paper dust
Influenced by curled thick
paper
Nip cam out of phase
Faulty nip spring
Abnormal
3-9
Flow 4
Voltage
＋21.5V
Explanatory
drawing 1
See P4-10
the main controller
Replace