Lens Drive Block - Epson PhotoPC 850Z Service Manual

EPSON PhotoPC 850Z
V
DD
1
Input
Buffer
XSHT
2
XV3
3
XSG3B
4
XSG3A
5
XV1
6
XSG1B
7
XSG1A
8
XV4
9
XV2
10
Figure 2-7. IC904 Block Diagram
Operating Principles

2.2.1.3 Lens Drive Block


SHT
20
V3B
19

V
L
18
V3A
17
V1B
16

V
H
15
V1A
14
V4
13

V2
12
GND
11
Operating Principles of Circuit Boards
Shutter Drive
The shutter drive signal (PCTRL) which is output from the ASIC expansion
port (IC108) is moved regular current drive for shutter, and the shutter
plunger is opened and closed.
The iris stepping motor drive signals (ACTRL1, ACTRL2, ACTRL3,
ACTRL4) which are output from the ASIC expansion port (IC108) are
driven by the motor driver (IC957), and the iris is moved six times.
Detection of the standard iris positions is carried out by means of the
photointerrupter (P12) inside the lens block.
Focus Drive
The focus stepping motor drive signals (LDIN1, LDIN2, LDIN3, LDIN4)
which are output from the ASIC expansion port (IC107) are driven by the
motor driver (IC954). Detection of the standard focusing positions is carried
out by means of the photo interrupter (PI) inside the lens block.
Zoom Drive
The zoom stepping motor drive signals (ZIN1, ZIN2, ZIN3, ZIN4) which are
output from the ASIC expansion port (IC107) are driven by the motor driver
(IC953). Detection of the standard zooming positions is carried out by
means of the photoreflectors (PR1, PR2) inside the lens block.
Revision A
44