Sharp SF-2414 Service Manual Page 27
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5. Optical system
5-1. General descriptions
• The optical system is composed of the fixed focus lens and six
mirrors.
Since the fixed focus lens is employed, No.4/No. 5 mirror base is
moved as well as the lens to change the distance between the
document and the drum (OID, Original Image Distance) for reduc-
tion and enlargement.
To move the lens and No.4/No. 5 mirror unit, he stepping motor is
driven by the signal from the main control PWB to allow zooming
of 0.70 to 1.22 (inch series: 0.64 ∼ 1.29) with 1% increment. (The
SF-2314 has no zooming function, and its lens and No.4/No.5
mirror base are fixed.)
• Exposure is adjusted by changing the voltage of the copy lamp.
The copy lamp unit is provided with the AE sensor for detection of
the original density to adjust the light quantity of the copy lamp
according to the original density.
• For exposure, the slit exposure system is employed where the light
source is moved. (The original table is fixed.)
12
9
127
615
17
8 14
1311316
4
5
10
1 Copy lamp 2 Reflector 3 No. 1 mirror
4 No. 2 mirror 5 No. 3 mirror 6 Lens
7 No. 4 mirror 8 No. 5 mirror 9 No. 6 mirror
F No. 2/No. 3 mirror base unit G Copy lamp unit H No. 4/No. 5 mirror base unit
I Mirror motor J Lens/No. 4/No.5 mirror base drive motor K Lens home position sensor
L Mirror home position sensor M Auto exposure sensor
(1) Original table
The original table is fixed, and originals are set to the left frame side
as the reference.
(2) Copy lamp
100V system (285W)
200V system (285W)
(3) Mirror
Six mirrors are used.
No. 1 mirror is provided in the copy lamp, No. 2/3 mirrors at the
No.2/3 mirror base, No. 4/5 mirrors at the No. 4/5 mirror base. The
No.2/3 mirror base is scanned during copying. The No.4/5 mirror
base is moved to change the distance between the original and the
photoconductor during zoom copying.
(4) Lens (Fixed focus lens)
• Construction (One group 3 lenses)
• Brightness (F8)
• Focus (175mm)
(5) Lens home position sensor (LHPS)
This sensor is used to sense the lens position. The sensor output
signal serves as the basic signal to control the copy magnification
ratio.
(6) Lens base
The lens is mounted to this lens base. It is moved in the paper feed
direction in reduction copying, and in the paper exit direction in enlar-
gement copying.
5 – 3
- SERVICE MANUAL 1
- MODEL SF-2314 1
- MODEL SF-2414 1
- MODEL SF-2514 1
- CONTENTS 2
- [1] GENERAL DESCRIPTION 4
- [2] PRODUCT SPECIFICATIONS 5
- 3. Supplies 7
- Storage period: 8
- Upper unit 9
- Lower unit 9
- 6 7 8 14 15 16 17 18 10
- 11 12 13 14 15 16 17 18 19 20 11
- 1. Packing drawing (SF-2514) 16
- 2. Installation 16
- (2) Space around the machine 17
- (3) Installing table 17
- Mirror unit fixing screw 18
- (3) Developer setting 19
- Developer unit 20
- Fixing screw 20
- (step screw) 20
- Mounting screw A 22
- Mounting screw B 22
- Mounting 23
- Multi bypass feeder unit 24
- [5] GENERAL DESCRIPTIONS OF 25
- EACH SECTION 25
- 3. Fuser, paper exit section 26
- 4. Developer section 26
- 5. Optical system 27
- 5-2. Basic operations 28
- 6. Copy process 30
- (3) Actual process 31
- Step 3 (Main Charging) 32
- Step 4 (Exposure) 32
- Step 5 (Development) 33
- Step 6 (Transfer) 34
- Step 7 (Separation) 34
- Step 8 (Cleaning) 35
- Step 9 (Discharging) 35
- (5) Process correction system 36
- 2) Correction operation 36
- [Initial setting] 37
- [Correction timing] 37
- [Correction operation] 37
- 7. SPF section (SF-2514 only) 38
- (Timing chart) 38
- [6] DISASSEMBLY AND ASSEMBLY 39
- 1-3. Separation roller 40
- One-way clutch side 41
- 1-6. Transport belt 42
- 1-7. Socket holder unit 42
- 1-8. Lower unit PWB 42
- 1-10. Power unit 42
- 2. Manual paper feed section 43
- 3. Fuser section 44
- 3-6. Scraper replacement 46
- 4. Optical system 47
- 4-6. Optical unit removal 49
- 5. SPF section 51
- 1, 2." 52
- 5-5. Clutch/solenoid removal 53
- 5-6. Sensor removal 53
- 6. Drum section 54
- 7. Developer section 54
- 7-3. Toner motor removal 55
- 7-4. Toner density sensor 55
- 9-3. Ventilation fan motor 56
- 9-1. Ozone filter 56
- 9-4. Transport roller clutch 57
- 9-5. Paper exit sensor 57
- [7] ADJUSTMENTS 58
- 0.625±0.03mm 59
- 2. Optical section 60
- Document Copy 63
- Document Copy A Copy B 64
- Cam fixing screw 65
- Do not move 65
- No.2 scanner unit 67
- Positioning plate 67
- Scanner unit drive pulley 67
- Document Copy C Copy D 68
- Change the right side 69
- Change the left side 69
- Copy paper 70
- Optical unit cover 71
- Copy image size 73
- Original size 73
- (7) Uniformity adjustment 75
- Paper exit 76
- Half-tone copy 76
- Less exposure 76
- (Dark copy) 76
- Scale image lead edge 78
- Enlargement copy (x 1.54) 78
- Reduction copy (x 0.64) 79
- Copy scale image 80
- Paper lead edge 80
- current void area (mm) 81
- 3. COPY DENSITY ADJUSTMENT 83
- Not copied 84
- Slightly copied 84
- adjustment 85
- Charger wire 87
- Improper 87
- [8] SIMULATIONS 88
- 4. Purpose list 89
- 5. Details of simulations 90
- ÷ Document length x 100 [%] 94
- EXP1~5 voltage 98
- Full power 98
- 6. User simulation 100
- Auto start function 101
- (2) User simulation prcedure 101
- (3) User program code table 102
- [9] SELF DIAG 103
- 4. Self diag contents 104
- 1) Paper feed section 109
- 2) Transport section 109
- [10] SERVICING AT MEMORY 110
- TROUBLE AND MAIN 110
- CONTROL PWB REPLACEMENT 110
- 4. Set value recording sheet 113
- 5. Memory simulation list 114
- [11] MAINTENANCE 115
- [12] ELECTRICAL SECTION 116
- M37702M2-XXXFP 117
- 3 Block diagram 118
- IN XIN IN Clock IN 119
- OUT XOUT OUT Clock OUT 119
- H=+32V, VB=+24V 120
- 1 General 121
- Stepping motor time chart 122
- External view 5P5 123
- Delay capacity 123
- V3' 124
- (1) Outline 126
- (2) Display circuit 127
- 1 Block diagram 127
- 2 Operation 127
- (3) LED display 128
- • AC PWB unit 128
- • In the main PWB unit 129
- COPYRIGHT 131
- 1997 BY SHARP CORPORATION 131
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