Canon 1000S, Service Manual

Page: 239 / 840

COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-195
3. OPERATION AND TIMING
VIII. EDITOR
A. Outline
The CLC1000's editor is a static type editor consisting of two tablets, one each for reading points in the
horizontal (X) direction and points in the vertical (Y) direction, and a pen switch.
The controller PCB recognizes the area indicated by the pen switch on the editor.
The CLC1000's tablet has electrode wires arranged at intervals of 6 mm; the static bond between the
electrode wire and the pen switch represent each specific point pressed by the pen.
B. Operation
When the pen switch presses the top tablet, the CPU on the control PCB applies pulses to the electrode
wires through both decoder of tablets as in 1, 2, ... n-1, n, n+1, and so forth.
The contact between a pulse and the pen switch results in a static bond, and the level of voltage is read
into the controller PCB through the pen switch. (Figure 3-801)
The voltage is then converted by the A/D converter circuit on the controller PCB into digital signals and
then further into a signal representing a spatial area in mm through computation by the CPU for
communication to the copier.
REF.
Since the editor identifies the point of input with reference to static bonding, a thick original (4
mm or less) may be placed on it.
On the other hand, it cannot accommodate originals made of conducting material, pressure
sensitive material, or carbon-backed paper.