Canon imagePRESS C1 Service Manual - page 422
Chapter 7
7-73
F-7-91
3. 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.
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4. Full-Color 2-Sheet Continuous Printing (2-image printing) (See after-mentioned note)
PVREQ signal (image demanding signal) for each color is produced based on the A-surface ITB home position detection signal (I_TOP1A) and the B-surface ITB
home position detection signal (I_TOP1B). The image is formed at constant speed based on this PVREQ signal.
The image is formed in order based on I_TOP1A for the first surface, I_TOP1B for the second surface.
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2-image printing is the print with image forming by 2 surfaces on the ITB. 2-image printing is available for up to LTR size (sub scanning direction) that is equivalent
to the interval between two home position detection signals.
5. Monocolor Continuous Printing
The image forming position on the ITB is arbitrary because the monocolor printing has single color. The DC controller does not perform the ITB home position
detection at monocolor printing.
After determining the home position by the timer inside the DC controller, PVREQ signal (image demanding signal) is produced. The image is formed based on
this PVREQ signal.
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Related Error Code
E070 (ITB HP detection fault error)
xx=01: ITB home position sensor B, xx=02: ITB home position sensor A, only at ITB 1/1 speed, XX=00: No discrimination
00xx: When ITB HP is not detected after the specified period of time passed, there is an error of ITB home position detection sensor
Start key ON
ON
INTR
PVREQ
Laser
(image formation)
A-sur
face
B-sur
face
L
L
Y
Y
M
M
C
C
I_TOP1A
I_TOP1B
I_TOP2A
I_TOP2B
I_TOP3A
I_TOP3B
I_TOP4A
I_TOP4B
Bk
Bk
I_TOP5A
I_TOP5B
Home position
detection signal
(PS1 or PS2 output)
Start key ON
ON
INTR
PVREQ
Laser
(image formation)
A-surf
ace
B-surf
ace
Home position
detection signal
Y
M
C
Bk
I_TOP1A
I_TOP2A
I_TOP3A
I_TOP4A
(PS1 or PS2 output)
Start key ON
ON
INTR
PVREQ
Laser
(image formation)
A-sur
face
B-sur
face
Y
Y
M
M
C
C
Bk
Bk
I_TOP1A
I_TOP1B
I_TOP2A
I_TOP2B
I_TOP3A
I_TOP3B
I_TOP4A
I_TOP4B
Home position
detection signal
(PS1 or PS2 output)
Start key ON
ON
INTR
PVREQ
Laser (image formation)
Home position detection
signal
L or Bk
I_TOP1A
DC controller inside timer