Canon iR C6800 Series, Руководство по обслуживанию

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Chapter 7
7-62
1 Secondary transfer outside roller home position flag
PS22: secondary transfer outside roller home position sensor
M20: secondary transfer outside roller shift motor
DCCON: DC controller
E0770001 (secondary transfer outside roller shift motor error)
indicates that the secondary transfer roller remains locked in place (PS22=1) 5 sec after the secondary transfer outside
roller motor (M20) is started.
7.8.9
Detecting the ITB Home Position
0003-1248
The machine is programmed to check the ITB home position to make sure that the image write start position is
correct. It uses the ITB home position sensor (PS1, PS30) to check the home position detection surfaces (2 reflecting
surfaces) found at the edge of the ITB using the following sequence of operation:
1. when a print command arrives, the DC controller rotates the ITB; upon detention of a reflecting surface, PS1 and
PS30 send their respective home position detection signal to the DC controller (1_TOP_SNS_A, 1_TOP_SNS_B).
2. in response, the DC controller assumes that the detection signal that first arrives represents the home position
(1_TOP1A; see Memo); then, it increases its count each time the next reflecting surface is detected (I_TOP2A,
I_TOP3A, I_TOP4A, and so on).
3. in the case of full color printing, the DC controller generates the sub scanning sync signal (PVREQ) as many as 4
times based on these signals, and sends them to the main controller. Thereafter, the DC controller receives video data
of individual colors 4 times to form images of individual colors at specific points of the ITB.
F-7-57
PS30
PS1
PS30
[2]
[1]
[2]
[2]
I_TOP_SNS_1
I_TOP_SNS_2
DC-CON