Circuit Description Of Cis Unit - Sharp UX-4000M - UX 4000 B/W Laser Printer Service Manual

UX-4000MU
FO-2950MU/C
F1
CN1
AC IN

[5] Circuit description of CIS UNIT

This CIS unit picks up optical information from the document, converts it
into an electrical (analog) signal and it to the control PWB.
1. Block diagram
SH
CISCLK
VLED
GLED
+5V
GND
OUTPUT CIRCUIT
AiN
(emitter follower)
Fig. 26
NOISE
RECTIFIED
FILTER
SMOOTHING
CIRCUIT
CIRCUIT
ZERO CROSS CIRCUIT
HEATER CIRCUIT
CN2
CIS
SIG
TRANSFORMER
SWITCHING
CIRCUIT
PC1
PC2
Fig. 25
2. Description of blocks
(1) CIS
The DL100-05AUJC is highly sensitive charged coupled image sensor
that consists of 1728 picture elements.
Receiving two drive signal (SI,CLK) from the control PWB, the trans-
ferred photoelectric analog signal SIG is impedance converted, and the
signal AIN, is supplied to the control PWB.
(2) Waveforms
1. CLK, SI, SIG signals within the control PWB.
CLK
SI
SIG
1
5 – 24
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T1
+5V
CIRCUIT
+24V
CIRCUIT
SW101
2 3 1720 1721 1722
5 msec/line
Fig. 27
+5V
+24VH
+24V
ZC
+24VS
HLON