Chapter 1414-20F-14-163. Turn the main power switch ON and then check to make sure that the startup screen is displayed on the LCD.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, turnthe 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 surethat 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 than2sec.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, replacethe main controller PCB with a new one.FH9-0807 Resister Switch BoardMF2-4550 Main Controller PCB Assembly14.2.2.1.5 LCD displays nothing/progress bar on LCD stops at one-fifth point and machine repeats restart: Because main controller PCBis faulty0010-6604iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 / / / / /[ Inspected by Canon Inc. ]DescriptionIn 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, andthe machine repeated restart.Field RemedyWhen 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 suchvoltage 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 BoardFM2-4550 Main Controller PCB Assembly (For iR4570 series)FM2-4551 Main Controller PCB Assembly (for iR2230)14.2.2.2 Control Panel-Related14.2.2.2.1 LCD on control panel remains black: Pilot lamp blinks0011-6429iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 / / / / / / /[ Case in the field ]DescriptionIn the field, the LCD on the control panel remained black and the pilot lamp blinked because the all day power PCB and the BootROM were faulty.Field Remedy1. Turn the main power switch OFF > unplug the power code > insert the resister switching board (FH9-0807) to an empty PCI on the main controller PCB> plug the power code > turn the main power switch ON.2. If the symptom still occurs, replace the all day power PCB with a new one. If the pilot lamp still blinking, replace the BootROM with a new one.FK2-0340 All Day Power PCB Assembly
