Canon iPF9000S Troubleshooting Manual page 146

Example 3: Main controller and head contact pin continuity check
1. Identify the color (chip) that has been found to have an imaging failure in a Nozzle Check Print operation.
2. Connect flat cable ③a under test to connector J02 of the flat cable checker.
3. Connect the ― terminal of the tester to any grounding terminal (GND as shown below).
4. Chips (A through F) have a specific color to control each and also have six contacts each. Check all these contacts for
continuity.
5. With the E-chip, for example, apply the + terminal of the tester to the contact at position E shown below to check for
continuity. (An example of making a continuity check on E-chip signals is shown below.)
■Nozzle check print and chip layout (Double-head model example）
A B
D E
A B
D E
Layout of head contact pins exposed with the head removed
B
C
C B B
A
GND GND
GND GND GND
Troubleshooting Guide
C
Left
head
F
C
Right
head
F
A
A B
A C C D
A C
B C D
A B
F
F E
D E
D E F F
E F
※
GND
D F
*Inaccessible for checking on the iPF5000 Series.
4-26
E
E D
GND GND
GND GND
Tester