4. If the startup screen does not appear, push the switch [8] on the resister switch board for only 2 sec. in a state in which the main power switch is turned ON, turn

the main power switch OFF in accordance with the procedure explained in step1 above, turn the main power switch ON 10 sec. later, and then, check to make sure

that the startup screen appears on the LCD.

Note: If the switch (Fig.[8]) is held down for more than 2 sec., the main controller PCB may be damaged. Therefore, be sure to hold down the switch for less than

2sec.

5. If the startup screen does not appear, replace the main controller PCB with a new one.

b. If 3.3V is applied to all the resisters, reinsert all the connectors of the main controller PCB, the BOOTROM, and the RAM. If the symptom still occurs, replace

the main controller PCB with a new one.

FH9-0807 Resister Switch Board

MF2-4550 Main Controller PCB Assembly

14.2.2.1.5 LCD displays nothing/progress bar on LCD stops at one-fifth point and machine repeats restart: Because main controller PCB

is faulty

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 / / / / /

[ Inspected by Canon Inc. ]

Description

In the field, the progress bar on the startup screen stopped at one-fifth point and the LCD became black. Then, the startup screen reappeared on the LCD, and

the machine repeated restart.

Field Remedy

When the symptom occurs, check if 3.3V is supplied for the resisters R64 (Fig.[3]), R65 (Fig.[4]), and R66 (Fig.[5]) on the main controller PCB. If such

voltage is not applied to either of these resisters, cope with such power supply condition using the service parts resister switch board (FH9-0807).

FH9-0807 Resister Switch Board

FM2-4550 Main Controller PCB Assembly (For iR4570 series)

FM2-4551 Main Controller PCB Assembly (for iR2230)