OKIDATA OF1050, Service Manual

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14 Image scanning method NA Letter size (1728-bit) contact image sensor
15 Contrast control 1) Automatic background sensing
A continuous document background of 0.3 OD
(optical density) or less will be transmitted as
white.
2) The LIGHT and DARK contrasts will
automatically be adjusted to improve image
quality.
16 Recording resolution Horizontal: 8 dot/mm
Vertical:
Fixed: 3.85 line/mm (200 x 100 LPI) (STD)
7.7 line/mm (200 x 200 LPI) (FINE, COPY)
17 Recording system Electro-photographic printing
A4 size (1728-bit) LED print head
18 Skew of recording paper Maximum allowable skew is + or - 1 mm over an
advance of 3.93" (100 mm.)
19 Copy darkness 1) Black image: Greater than 1.0 OD
(Optical density)
2) White background: Not greater than 0.2
OD (Optical density)
20 Copy uniformity Printed copies will exhibit a uniform density of
the printed and background area:
1) From edge to edge: 25% unit
2) From copy to the next copy: 30% unit
21 Recording paper running out The fax can detect the no-paper condition by a
photosensor.
When the paper has run out in the local copy
operation, the scanning will stop with " NO
PAPER ... REPLACE PAPER" on the LCD, and
an ALARM LED turns on without an alarm tone.
When the paper has run out while a message is
being received and the no-paper reception is
activated, the LCD display will show "MSG. IN
MEMORY ", and the ALARM LED turns on.
22 Minimum scan line time 0 ms, when receiving from an OKIDATA for
receiving facsimile.
5 ms at 7.7 line/mm and 10 ms at 3.85 line/mm
when receiving from a non-OKIDATA facsimile.
23 Coding scheme 1) One-dimensional coding scheme:
Modified Huffman (MH)
2) Two-dimensional coding scheme:
Modified READ (MR)