Image Scanning; Sub Scan Resolution Conversion - Ricoh FAX4700L Service Manual

DETAILED SECTION DESCRIPTIONS December 21st, 1995
SCANNER

2.1.2. Image Scanning *

[B]
[G]
[F]
[A]
[E]
[C]
[D]
H515D006.wmf
The scanner consists of a xenon lamp [A], exposure glass [B], mirrors ([C],
[D] and [E]), lens [F], and SBU [G].
The light reflected from the document is focused onto the CCD (Charge Cou-
pled Device) on the SBU [G] through mirrors ([C], [D] and [E]) and lens [F].

1. Sub Scan Resolution Conversion

Standard: The machine feeds the document in 7.7 line/mm steps. In text
mode, it scans in accordance with the setting of scanner bit switch 00 - bit 4.
In halftone mode, it skips every other line.
Scanner bit switch 00
Bit 4 = 0 Bit 4 = 1
Scan - 7.7 l/mm
Immediate tx/ Copying Scan - 3.85 l/mm
Tx/Copy - 3.85 l/mm
Tx/Copy - 3.85 l/mm
(OR processed)
(Every other line is skipped)
OR processing is always
Scanning to memory
disabled.
Detail: The machine feeds and scans the document in 7.7 line/mm steps.
The scanned lines are transmitted without any conversion.
Fine: The machine feeds and scans the document in 15.4 line/mm steps.
The scanned lines are transmitted without any conversion. In memory trans-
mission, if the other terminal cannot receive a message at Fine resolution,
alternate lines (even-numbered lines) are deleted before transmission.
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