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Service Manual for OF5800
Chapter 2 Machine Operations
When the document reaches the scan wait position, the machine waits for the next command. It will start
scanning the document when either the start or copy key is pressed. The light from the scanner lamp
strikes the face of the document and is reflected into the lens through mirrors A, B, and C. In case the light
intensity along the length of the scanner lamp is not uniform, shading compensation is provided to ensure
even illumination.
As the reflected image passes through the lens, it is focused onto the charged coupled device(CCD). The
CCD then converts the dark and light areas of the image into electrical impulses, or image data. Circuits
on the main control PC board encode the image data and send it to the modem where it is modulated. The
modulated signal is then placed onto the telephone line by the NCU.
When DS2 detects the trailing edge of the document, the image signal output is turned off. The scanner
continues to remain active for a few more seconds in case there is another document to follow.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)