Epson PC3000Z Service Manual Page 42
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EPSON PhotoPC 3000Z Revision A
Operating Principles Circuit 42
Figure 2-8. IC905 Block Diagram
2.2.1.5 Transfer of Electric Charge by the Horizontal CCD
The transfer system for the horizontal CCD employs a 2-phase drive method.
The electric charges sent to the final stage of the horizontal CCD are
transferred to the floating diffusion, as shown in Figure 2-9.
Figure 2-9. Horizontal Transfer of CCD Imager and Extraction of
Signal Voltage
RG is turned on by the timing in (1), and the floating diffusion is charged to
the potential of PD. The RG is turned off by the timing in (2). In this condition,
the floating diffusion is floated at high impedance. The H1 potential becomes
shallow by the timing in (3), and the electric charge now moves to the floating
diffusion.
Here, the electric charges are converted into voltages at the rate of V = Q/C by
the equivalent capacitance C of the floating diffusion. RG is then turned on
again by the timing in (1) when the H1 potential becomes deep.
Thus, the potential of the floating diffusion changes in proportion to the
quantity of transferred electric charge, and becomes CCD output after being
received by the source follower. The equivalent circuit for the output circuit is
shown in Figure 2-10.
Figure 2-10. Theory of Signal Extraction Operation
30
CCDIN
23
CLPDM
36
AUX1IN
34
AUX2IN
47
SDATA
48
SCK
46
45
SL
SEN
16
DATA
CLK
22
SHD
21
SHP
15
DVSS
17
DVDD
40
38
VRT
39
VRB
13
DRVDD
14
DRVSS
12
DOUT
1
19
CLPOB
24
VD
18
HD
25
AVSS
33
AVDD
19
PBLK
CLP
2:1
MUX
BUF
CLP
CONTROL
REGISTERS
DIGITAL
INTERFACE
CDS
PxGA
2:1
MUX
6
10
8
VGA
INTERNAL
TIMING
INTERNAL
BIAS
BANDGAP
REFERENCE
12-BIT
ADC
CLP
COLOR
STEERING
4 6 dB
Offset
DAC
26
35
27
41
AD9842
12
236 dB
H1 H2 H1 H2 H1 HOG RG
CCD OUT
PD
(1)
H1 H2 H1 H2 H1 HOG RG
CCD OUT
PD
(2)
H1 H2 H1 H2 H1 HOG RG
CCD OUT
(3)
H1
H2
RG
CCD OUT
3.5V
0V
3.5V
0V
13.5V
0V
(1) (2) (3)
ca1fig1-7
Floating
Black level
RＧ pilse leak signal
Signal voltage
Diffusion
Reset gate pulse
12V Pre-charge drain bias（PD）
Direction of Transfer
Voltage output
C is charged
Floating diffusion gate is
Electric charge
H resistor
ca1fig1-8
equivalently
floated at a high impedance.
- SERVICE MANUAL 1
- SERVICE MANUALSERVICE MANUAL 1
- PRECAUTIONS 3
- Revision Status 5
- Contents 6
- Chapter 3 Troubleshooting 7
- Chapter 5 Adjustment 7
- Chapter 6 Maintenance 7
- Chapter 7 Appendix 7
- PRODUCT DESCRIPTIONS 8
- 1.1 Features 9
- 1.1.1 Exterior View 10
- 1.2 Functional Specification 11
- 1.2.5 Set Up Mode 14
- 1.2.4 Playback Mode 14
- 1.2.6 Video Recording Mode 15
- 1.2.7 Sound Mode 15
- 1.2.8 Communication with PC 15
- 1.2.9 Memory 15
- 1.2.10 Internal Lock 16
- 1.2.11 Miscellaneous 16
- 1.3 Indication 17
- 1.3.2 LCD Panel Indication 18
- 1.3.2.2 ISO Sensitivity 19
- 1.3.2.3 White Balance 19
- 1.3.3 LED Condition 21
- 1.3.4 LCD Monitor 22
- 1.4 Operation 23
- 1.4.2 Sinking Lens Control 24
- 1.4.3 Setting Stored 24
- 1.4.4 Processing Time 25
- 1.5 Interface 26
- Camera 27
- 1.5.2.2 Mac. Serial Cable 28
- 1.5.2.3 USB Cable 28
- 1.5.2.4 A/V Cable 29
- 1.6 Power Supply 30
- 1.7 Environment Condition 32
- 1.8.1 EMI, Safety Standard 33
- 1.8.2 Reliability Standards 33
- 1.9 Inhibitions and Cautions 34
- OPERATING PRINCIPLES 35
- W ARNING 36
- 2.2 Circuit 37
- 2.2.1.1 Configuration 39
- 2.2.1.2 IC903 (CCD) 39
- C is charged 42
- 2.2.2.1 Circuit Description 44
- 2.2.2.2 Outline of Operation 44
- 2.2.2.3 LCD Block 45
- 2.2.2.4 Lens Drive Block 45
- 2.2.3.1 Circuit Description 46
- 2.2.4.3 Power Supply Control 51
- 32KHz=Sub clock operation 52
- TROUBLESHOOTING 53
- 3.2 Troubleshooting 55
- DISASSEMBLY AND ASSEMBLY 57
- 4.1.2 Tools 59
- 4.2 Disassembly 60
- 4.2.3 Removal of SY1 and LCD 62
- ADJUSTM ENT 63
- REQUIRED 63
- 4.3 Assembly 64
- Looked from 67
- ADJUSTMENT 70
- 5.1 Overview 71
- Adjustment Overview 73 73
- 5.2 Adjustment 74
- 5.2.2 PW1 Board Adjustment 75
- 5.2.3 Lens Adjustment 76
- 5.2.4 AWB Adjustment 77
- シリアルケーブル 78
- 15cm±1cm 78
- カラービューアー（5100K） 78
- および色調整用チャート 78
- 5.2.7 LCD Panel Adjustment 80
- 5.2.7.1 LCD H AFC Adjustment 81
- 5.2.7.2 LCD Gain Adjustment 82
- CL415 waveform 83
- CL414 waveform 84
- CL413 waveform 85
- 5.2.8 Firmware Upload 86
- Adjustment Adjustment 87 87
- MAINTENANCE 88
- 6.1 Overview 89
- APPENDIX 90
- CA1/2 Circuit Board 93
- 7.3 Circuit Diagram 96
- 7.4 Exploded Diagram 105
- CABINET 1 106
- CABINET 2 107
- 7.5 Siemens Star Chart 108
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