Sharp FO-2970M Service Manual - Page 60
] Circuit description of CIS UNIT
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FO-2970MU F1 CN1 AC IN NOISE FILTER CIRCUIT RECTIFIED SMOOTHING CIRCUIT SWITCHING CIRCUIT T1 TRANSFORMER +5V CIRCUIT +24V CIRCUIT +5V +24VH SW101 +24V ZERO CROSS CIRCUIT HEATER CIRCUIT CN2 Fig. 25 PC1 PC2 ZC +24VS HLON [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 CIS +5V GND AiN OUTPUT CIRCUIT SIG (emitter follower) Fig. 26 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 transferred 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 2 3 1720 1721 1722 5 msec/line Fig. 27 5 - 24
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