Itb Home Position Detection - Canon imagePRESS C1 P Service Manual

Chapter 7
When the waste toner is filled, the machine is stopped and the service error code (E013-0005) is displayed.
The value of the soft counter can be checked and cleared by the following service mode.
COPIER>COUNTER>MISC>2TC-BOX

7.9.10 ITB Home Position Detection

imagePRESS C1 P / imagePRESS C1
This machine detects the ITB home position to adjust the reading position of the image.
The ITB home position sensor (PS1, PSS2) detects the home position detection surface (two reflecting surfaces) prepared at the end of the ITB to detect the home
position. The following is the operation procedure.
1) When receiving the print instruction, the DC controller turns the ITB. When detecting the reflecting surfaces, PS1 and PS2 send the home position detection
signal respectively (I_TOP_SNS_A, I_TOP_SNS_B) to the DC controller via the side driver PCB.
2) The DC controller determines the sensor detection signal that was first input as the home position (see REMARK) (I_TOPIA), and counts the home position
each time the next reflection surface is detected, such as I_TOP2A, I_TOP3A, I_TOP4A,
3) For full color print, the DC controller produces sub scanning synchronized signal (PVREQ) four times based on this signal, send them to the main controller.
After that, the DC controller receives the video data for each color four times from the main controller and forms the toner image for each color in order on the
specified position on the ITB.
[2]
[2]
[1] ITB
[2] Reflecting surface
[3] Side driver PCB
PS1: ITB home position sensor A
PS2: ITB home position sensor B
DC-CON: DC controller
MEMO:
A-surface home position (I_TOP1A) is the signal to form images by one surface on the ITB.
B-surface home position (I_TOP1B) is the signal to form images by two surfaces on the ITB.
The DC controller determines the first sensor output (PS1 or PS2) that detects the reflecting surface on the ITB after receiving the print instruction as A-surface
home position.
It then assumes the point reached a specific period of time after side A home position to be side B home position.
The following are the timing of image forming for each print mode.
1. Full-color one-sheet print
PVREQ signal (image demanding signal) for each color is produces based on A-surface ITB home position detection signal (I_TOP1A). The image is formed based
on this PVREQ signal.
7-70
PS2
PS2
PS1
[1]
[2]
I_TOP_SNS_1
I_TOP_SNS_2
F-7-85
[3] DC-CON
0013-7818