Sharp AL-2051 Service Manual Page 37
- Page / 139
- Table of contents
- BOOKMARKS
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AL-2051 OPERATIONAL DESCRIPTIONS 7 - 2
2. Scanner section
A. Scanner unit
The scanner unit in the digital copier scans images.
It is composed of the optical unit and the drive unit. The optical unit
performs scanning in the main scan direction with the light receiving
elements (color CCD). The drive unit performs scanning in the sub
scanning direction by moving the optical unit.
B. Optical system
Two white lamps are used as the light source.
Light radiated from the light source is applied to the document on
the document table. The reflected light from the document is
reflected 4 times by No. 1 - No. 3 mirrors and passed through the
reduction lens to form images on the light-receiving surface of 3-line
CCD.
The light-receiving surface of the color CCD is provided with 3 line
scanning sections for RGB. Separate images scanned in each color
section are overlapped to complete color scanning. (When PC
scanning)
The resolution is 600dpi.
When copying, only the green component is used to print with the
printer.
The color component for printing can be switched to red or blue by
the service simulation.
(Spectrum characteristics of the lamp)
(Spectrum characteristics of the color CCD)
(Optical unit)
C. Drive system
The drive system is composed of the scanner motor, the pulley
gear, the idle pulley, the idle gear, the belt 473, the belt 190, and the
shaft.
The motor rotation is converted into reciprocated movements of the
belt 473 through the idle gear, the pulley gear, the belt 190, and the
idle pulley to drive the optical unit.
100
75
50
45.4
100.0
50.2
25
380
480
580
680
780
Wavelength [nm]
Sensitivity
1 Table glass 2 Optical unit 3 Lens
4 Mirror 1 5 Mirror 2 6 Mirror 3
7 CCD PWB 8 Lamp 9 Reflector
10 Original
Spectral sensitivity characteristics (Standard characteristics)
Relative sensitivity
Wavelength [nm]
89 9
10
1
7
5
3 4 2
6
7
9
34 6 285
1
3
1 Scanner motor 2 Pulley gear 3 Idle pulley
4 Belt 473 5 Belt 190 6 Optical unit
7 Shaft 8 Idle gear 9 Table glass
- SERVICE MANUAL 1
- CAUTION 2
- CONTENTS 4
- [1] GENERAL 6
- [2] SPECIFICATIONS 7
- 3. Copy performance 8
- 4. Network board 9
- 5. Printer 9
- 6. Scan function 9
- [3] CONSUMABLE PARTS 10
- 2. Environmental 11
- 1. Appearance 12
- 2. Internal 12
- 3. Operation panel 13
- 4. Motors and solenoids 14
- 5. Sensors and switches 15
- 6. PWB unit 16
- 7. Cross sectional view 17
- 1. Copier installation 18
- 2. Cautions on handling 18
- 4. Unpacking 19
- 7. Loading paper 19
- 8. Power to copier 20
- 9. Software 20
- B. Installing the software 21
- (2) Connecting a USB cable 22
- D. Setting up button manager 26
- 10. Interface 27
- 11. Moving 27
- C. Attachment method 28
- 20mm - 25mm 29
- [6] COPY PROCESS 32
- 2. Outline of print process 33
- 3. Actual print process 33
- About DC 5.2kV 34
- Semiconductor laser 35
- [7] OPERATIONAL DESCRIPTIONS 36
- 2. Scanner section 37
- 3. Laser unit 38
- 4. Fuser section 38
- A. General description 39
- Gear 20T 42
- Process detection switch 42
- Gear 38T 42
- 7. RSPF section 43
- D. RSPF open/close detection 44
- (book document detection) 44
- A. Initial state 44
- B. Front copy 44
- C. Back copy 44
- 9. Shifter 45
- [8] DISASSEMBLY AND ASSEMBLY 46
- 2. Operation panel section 47
- 3. Optical section 48
- 4. Fusing section 50
- PPD2 sensor 51
- Heater lamp 51
- Heat roller 52
- C. Assembly procedure 53
- B. Disassembly procedure 53
- PS semi-circuler 57
- 7. Rear frame section 61
- 8. Power section 62
- 9. Duplex motor section 62
- 10. Reverse roller section 63
- 11. RSPF section 63
- C. Document tray unit 64
- F. Drive unit 64
- G. Shutter solenoid 65
- I. Paper empty sensor 66
- J. PS roller 67
- K. Upper transport roller 67
- L. Paper sensor 68
- M. Lower transport roller 68
- N. Paper exit sensor 68
- [9] ADJUSTMENTS 69
- B. Image position adjustment 70
- B4 or 8 1/2″ × 14″ paper 71
- A4 size rear edge 71
- Paper rear edge 71
- Scale image 71
- 2. Copy density adjustment 72
- 3. High voltage adjustment 73
- 4. Duplex adjustment 74
- Document guide 75
- The trailing edge has a scale 75
- Table glass 75
- 2. Key rule 77
- 3. List of simulations 77
- (Example) 101
- (Main cassette paper feed) 102
- Chart back surface 106
- 5. Trouble codes 108
- [11] USER PROGRAM 112
- [12] ELECTRICAL SECTION 115
- 2. Actual wiring diagram 116
- RSPF UNIT 117
- 3. Signal name list 118
- [13] CIRCUIT DIAGRAM 120
- 2/14Memory section 121
- 3/14Buffer section 122
- 4/14Driver section 1 123
- 5/14Driver section 2 124
- 6/14Connector section 1 125
- 7/14Connector section 2 126
- 8/14Connector section 3 127
- 9/14Pull Up/Down section 128
- 11/14KronosII SDRAM section 130
- 13/14KronosII USB/LSU section 132
- 14/14Power Source section 133
- 1/3LED/LCD section 134
- 2/3KEY / Buzzer section 135
- 3/3Connector section 136
- LEAD-FREE SOLDER 137
- CAUTION FOR BATTERY DISPOSAL 138
- Trademark acknowledgements 139
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