Canon CLC 1130, Service Manual

Page: 429 / 965

CHAPTER 9 EXTERNALS / AUXILIARY MECHANISMS
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COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.2 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
VI. EDITOR
A. Outline
The copier’s editor is of a type referred to as a static editor, consisting of a tablet which enables
reading in horizontal (X) and vertical (Y) directions and a pen switch.
The editor controller PCB reads points pressed by the pen switch as defining a selected area.
The copier’s tablet consists of electrode wires arranged at intervals of 6 mm, and the static
bond occurring in response to contact between an electrode wire and the pen switch will be
identified as a specific pen input point.
B. Operations
When the pen switch presses on the tablet, the CPU on the editor controller PCB applies pulses
to each electrode wire through the tablet decoder in a specific direction in terms of 1, 2, ..., n-1, n,
n+1.
The static bond occurring between the pulse and the pen switch allows the controller PCB to
read the level (strong or weak) of the voltage through the pen switch. (Figure 9-601)
The voltage read in this way is converted into a digital signal by the A/D conversion circuit on
the controller PCB, and is computed into an area (in mm) by the CPU; the result is then sent to the
copier.
REF.
The copier uses static bonding to detect a point of input, allowing the use of a
thick original (4 mm or less). On the other hand, it does not allow the use of an
object made of conducting material, pressure-sensitive paper, or carbon-backed
paper.