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15
SF-7200
3. CLR Circuit
one.
The 1C201 is a hybrid IC operating the common section of
Basically, the CLR
circuit is similar to the conventional
the CLR basic circuit. |
1C201 Internal circuit diagram
1. 2 pin
3 pin
4 pin
5 pin
6 pin
7 pin
8 pin
9 pin
10 pin :
14 pin :
15 pin :
16 pin :
16-4
GND
Triac control output.
Internal power supply output (19.6V).
Output
control
signal. The
triac control
is
issued from the 3-pin when
the signal is in
low level (OV).
Exposure control input.
Input
voltage
in crease:
Copy
lamp
more
intense.
Input
voltage
decrease:
Copy
lamp _ less
intense.
Power
supply
input.
(All
wave
rectified
waveform)
Power
supply
input.
(All
wave
rectified
waveform).
;
,
Reference
voltage.
Exposure
control
input
voltage compared and amplified output.
Reference
voltage
(changes proportionate to
the AC supply voltage).
Reference voltage.
Reference voltage.
All wave rectified waveform input.
17 pin :
18 pin:
sw
sw2
CLR
Reference voltage input (9.8V).
Reference voltage output (9.8V).
Drum sensitivity select switch.
Auto exposure correction switch.
Copy lamp actuating signal. A low on this line
(OV) makes the PC201 active so as to actuate
the copy lamp.
Goes low level (OV) during the enlarge copy
(x2.0) mode. A low on this line makes the PC
202 active so as to operate in the x2.0 expo-
sure,
Auto exposure mode signal. Goes low (OV) in
the auto exposure mode.
A low on this line
makes
the PC202
active so that the
!C202
#1-pin output (AE control output) is supplied
to the #6-pin of the 1C201 to perform the
automatic exposure.
Manual exposure mode signal. Goes low (OV)
in the manual exposure mode. A low on this
line makes the PC203 active, and the exposure
contro!
VR
mid-point voltage is supplied to
the #6-pin of the 1C201 to perform the manu-
al exposure.
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