Circuit Description Of Cis Unit; Circuit Description Of Operation Panel Pwb - Sharp FO IS125N - B/W Laser - All-in-One Service Manual

FO-IS125N

[4] Circuit description of CIS unit

1. CIS
Cis is an image sensor which puts the original paper in close contact
with the full-size sensor for scanning, being a monochromatic type with
the pixel number of 1,728 dots and the main scanning density of 8
dots/mm.
It is composed of sensor, rod lens, LED light source, light-conductive
plate, control circuit and so on, and the reading line and focus are pre-
viously adjusted as the unit.
Due to the full-size sensor, the focus distance is so short that the set is
changed from the light weight type to the compact type.

[5] Circuit description of operation panel PWB

1. Operational description
1) Operation panel PWB
The operation panel PWB consists of 70 keys.
This PWB includes the four KEN lines (5bit) and the seven /SEN
lines (7bit). The four KEN lines are controlled by CX95410-12Z
(Fax Engine) on control PWB and the seven SEN lines return sig-
nals to Fax Engine control PWB. Four KEN signals are inputted to
decorder owing to make Y signal.
2. Block diagram
/SEN[6:0]
KEN[3:0]
Decorder
DATA[3:0]
E/RS/VO/3.3V
+3.3 V
B C
LED ON
(From IC100)
E
DG
Fig. 19
5 – 27
2. Waveforms
The following clock is supplied from IC100 (CX95110) of the control
board, and VO is output.
Approx. 5ms
ΦT
2µs
CISCLK
VO
2) LCD
The LCD display density is not controlled. Other lines are included
E/RS/VO signals.
3) LED
The LED on this PWB is also controlled by LEDON (1bit signal)
from control PWB.
KEY MATRIX
Y[9:0]
LCD
R
LED
Approx. 3.3V
0V
0.6V~2.6V
(White original paper)
Fig.18