Nikon COOLPIX 4500 Maintenance Manual
VAA11901-R.3579.A
- E2 ･ E4500 -
図 1-3. ICC904 ブロック図
3. IC904 (V Driver)
An H driver (IC995) and V driver (IC904) are
necessary in order to generate the clocks (vertical
transfer clock, horizontal transfer clock and electronic
shutter clock) which driver the CCD.
In addition the XV1-XV4 signals which are output from
IC102 are the vertical transfer clocks, and the XSG1
and XSG signal which is output from IC102 is
superimposed onto XV1 and XV3 at IC904 in order to
generate a ternary pulse. In addition, the XSUB signal
which is output from IC102 is used as the sweep pulse
for the electronic shutter.
necessary in order to generate the clocks (vertical
transfer clock, horizontal transfer clock and electronic
shutter clock) which driver the CCD.
In addition the XV1-XV4 signals which are output from
IC102 are the vertical transfer clocks, and the XSG1
and XSG signal which is output from IC102 is
superimposed onto XV1 and XV3 at IC904 in order to
generate a ternary pulse. In addition, the XSUB signal
which is output from IC102 is used as the sweep pulse
for the electronic shutter.
1
18
10
9
8
7
6
5
4
3
2
14
15
16
17
20
19
11
12
13
SHT
V3B
V
L
V3A
V
H
V1B
V1A
GND
V4
V2
XV2
V
DD
XSHT
XSG3B
XSG3A
XV1
XSG1B
XSG1A
XV4
Input
XV3
Buffer
Fig. 1-3. IC904 Block Diagram
4. Lens drive block
4-1. Focus drive
The focus stepping motor drive signals (FM RESETB,
FM CW, FM CLK and FM OEB) which are output
from 8-bit microprocessor (IC301) are used to drive
micro step by the motor driver (IC956). Detection of
the standard focusing positions is carried out by means
of the photointerruptor (FPI) inside the lens block.
4-1. Focus drive
The focus stepping motor drive signals (FM RESETB,
FM CW, FM CLK and FM OEB) which are output
from 8-bit microprocessor (IC301) are used to drive
micro step by the motor driver (IC956). Detection of
the standard focusing positions is carried out by means
of the photointerruptor (FPI) inside the lens block.
4-2. Zoom drive
The zoom stepping motor drive signals (ZIN1, ZIN2,
ZIN3 and ZIN4) which are output from 8-bit
microprocessor (IC301) are used to drive by the motor
driver (IC953). Detection of the standard zoom
positions is carried out by means of photoreflector (ZPI)
inside the lens block.
The zoom stepping motor drive signals (ZIN1, ZIN2,
ZIN3 and ZIN4) which are output from 8-bit
microprocessor (IC301) are used to drive by the motor
driver (IC953). Detection of the standard zoom
positions is carried out by means of photoreflector (ZPI)
inside the lens block.
4-3. Iris drive
The iris stepping motor drive signals (IIN1, IIN2, IIN3
and IIN4) which are output from the ASIC expansion
port (IC106) are converted into drive by the motor drive
(IC953), and are then used to drive the iris steps.
The iris stepping motor drive signals (IIN1, IIN2, IIN3
and IIN4) which are output from the ASIC expansion
port (IC106) are converted into drive by the motor drive
(IC953), and are then used to drive the iris steps.
4-4. Shutter drive
The two shutter motor drive signals (SIN1, SIN2)
which are output from the ASIC expansion port (IC106)
are converted into drive pulses by the motor drive
(IC952), and the mecha shutter is opened and closed by
regular current drive.
The two shutter motor drive signals (SIN1, SIN2)
which are output from the ASIC expansion port (IC106)
are converted into drive pulses by the motor drive
(IC952), and the mecha shutter is opened and closed by
regular current drive.