Canon Vizcam 1000, Руководство по обслуживанию

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COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-89
3. OPERATION AND TIMING
b. Initial Potential Control
Under this control, ideal grid and developing biases are determined as shown in Figure 3-507. The grid
bias (Vg) of the primary charging assembly is set to two different voltages as in Figure 3-508 to measure the
dark area potential (Vd: 00 activation of laser) and the light area potential (VL: full activation of laser).
Figure 3-507 Figure 3-508
Subsequent copying operations are executed using the grid bias and the developing bias determined as
discussed; the timing of measurement is as follows:
Figure 3-509
Video signals set to 00H and FFH
Power switch turned ON
Vg set to -300 V; Vd and VL measured
Vg set to -700V; Vd and VL measured
Grid bias (Vg) and developing bias (Vdc) computed
so as to obtain selected contrast potential
Start key ON
Contrast potential computed
by PASCAL
Vg-Vd/VL characteristic shown
in Figure 3-508 computed
based on measurements
Vg1(-300V)
Vd
Vd2
Vd1
VL1
VL2 VL
Vg2(-700V)
Potential
(negative)
Drum motor
Pre-exposure lamp
Potential measurement
Grid bias
Lasers for Y,M,C,Bk
Developing bias
Power switch ON
Drum full rotation 1/2 rotation 1/2 rotation 1/2 rotation 1/2 rotation 1/2 rotation 1/2 rotation 1/2 rotation
FF activation 00 activation
-300V -700V
-200V -500V
WMUPR
VL VL VL VL VD VD VD VD
00 activation FF activation