C. Controlling the Scanning
Lamp
1. Outline
The scanning lamp iscontrolled bythe DC controller
PCB as follows;
Figure 3-24.
the scanning lamp
and OFF.
the scanning lamp intensity.
2.
a.
Turning the Scanning Lamp
and OFF
The microprocessor
Q302)
the DC
controller PCB causes the transistor (Q324) to
to go
the lamp goes OFF when Q324 goes
OFF.
b.
Controlling the Scanning Lamp Intensity
The intensity of the scanning lamp varied by
controlling the
supplied to it response
to the
of the intensity adjustment
D C
P G B
(LINT) from the DC controller PCB.
The LINT
varies between 10 and 16 V
as determined by the
density correction
controlling the
supplied to the
scanning lamp so that it varies between 50 and
75 V (phase control).
to the scanning lamp raised by about 1.8 V as
opposed to when the black developing assembly
so as to
the intensity of the
scanning lamp. A
(70 V),
however, applied to the scanning lamp during
exposure for both the black developing
sembly and CT
c. Error Identification
The scanning lamp monitored
the lamp
(LIGHT).
the scanning lamp
(LIGHT)
present
the DC controller for about 20
continuously, the error identification
the
power OFF
(ACOFF) to cut
off the
power;
p. 3-47.
S w i t c h i n g
Figure 3-24
CANON INC.
C A N O N
M A V
IN JAPAN
JAPONI
S c a n n i n g
Summary of Contents for NP-2120
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