Minolta Di551 Service Manual page 111

ADU
A contact image sensor is used as PS70 (paper
mis-centering). The paper edge position is
detected by paper mis-centering sensors. Based
on the edge position information, the image write
position is shifted to correct mis-centering and
leading edge timing at the time of image write.
PS70 operates after a lapse of the specified time
from turning ON of PS43 (leading edge).
2. Signals
a. Input signals
(1) LOOP_PS (P36 to PRCB)
Loop formation reference timing detection sig-
nal.
The leading edge or trailing edge of paper is
detected.
[L]: Detected.
[H]: Not detected.
(2) LD (M5 to ADUDB)
M5 fault detection signal
[L]: Normal
[H]: Abnormal
(3) DEF_VIDEO (PS70 to ADUDB)
PS70 (paper mis-centering) sensor output signal
(4) 2ND_PS (PS44 to ADUDB)
Second paper feed reference timing detection
signal
[L]: Detected.
[H]: Not detected.
(5) EDGF_PS (PS43 to ADUDB)
Paper leading edge detection signal
[L]: Detected.
[H]: Not detected.
(6) REG_PS (ADUDB to PRCB)
Paper leading edge detection signal.
[L]: Detected.
[H]: Not detected.
b. Output signals
(1) START/STOP (ADUDB to M5)
M5 (conveyance) drive control signal
[L]: M5 ON
[H]: M5 OFF
(2) 2NDM_CLK, CLK (PRCB to ADUDB to M5)
M5 (conveyance) clock signal
(3) 2ND_MC (ADUDB to MC1)
MC1 (registration) drive control signal
[L]: MC1 ON
[H]: MC1 OFF
(4) DEF_SI (ADUDB to PS70)
PS70 (paper mis-centering) start pulse
(5) DEF_CLK (ADUDB to PS70)
PS70 (paper mis-centering) drive clock signal
(6) DEF_LED (ADUDB to PS70)
PS70 (paper mis-centering) LED control signal
(7) CW/CCW (ADUDB to M5)
M5 (conveyance) rotational direction indication
signal
[L]: CCW
[H]: CW
(8) H/L (ADUDB to M5)
M5 (conveyance) rotational speed indication sig-
nal
[L]: Low speed
[H]: High speed
(9) A, /A (PRCB to M6)
M6 (loop roller) A-phase drive control pulse sig-
nal
(10) B, /B (PRCB to M6)
M6 (loop roller) B-phase drive control pulse sig-
nal
2-N-8