Sharp SF-2414 Service Manual Page 26
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- Table of contents
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2. Separation, transport section
After passing the resist roller section, the paper is transported to the
transfer section. After transfer, the paper is separated from the drum
by the separation electrode and the drum separation pawl, then
transported to the fuser section by the transport belt.
3. Fuser, paper exit section
The toner image transferred on the paper is fused by the heat and
pressure of the upper and the lower heat rollers. After fusing, dis-
charge static electricity on the paper with the discharge brush. Then
the paper is discharged to the copy tray.
• Temperature control
• Abnormally high temperature (H3)
• Abnormally low temperature (H4)
• Thermistor disconnection (H2)
*
When the thermostat contact is open, it is required to press the
reset button in the upper side of the thermostat. (The contact is not
reset automatically.)
4. Developer section
4-1. General descriptions
(1) Two-component developer
The developer is composed of toner and carrier.
Carrier serves as a medium for attaching toner onto the electrostatic
image on the photoconductor drum.
By stirring toner and carrier, they are rubbed to be charged positive
(+) and negative (–) respectively.
Since developer will deteriorate to degrade copy quality, it should be
replaced regularly.
(2) Two-component magnetic brush development
The rotatable non-magnetic sleeve is provided over the magnet roller
and is rotated.
Carrier forms a magnetic brush on the sleeve surface by magnetic
force to attach toner onto the electrostatic image on the photoconduc-
tor drum.
(3) Developing bias
When the photoconductor is charged and exposed to light (ex-
posure), the surface potential (voltage) of the photoconductor will not
be lost completely. (The residual potential remains.)
Toner is attracted to the photoconductor by this residual potential,
dirtying the photoconductor. As a result, a dirty copy of white back-
ground is generated.
To prevent against this, a voltage of the same polarity and higher
than the residual potential is applied to the MG roller, preventing toner
from being attached to the photoconductor surface.
CPU
Thermistor
Thermostat
Heat roller
Heater lamp
Heat roller surface
temperature detection
The heat roller is heated by the
heater lamp.
(When the heat roller surface
temperature is 180 C˚ or lower,
the heater lamp is actuated)
Contact open (*)
Abnormal high
temperature
(Heater trouble)
Self diag display
MG roller
Residual potential < DV BIAS
Toner
Carrier
DV BIAS
-200V
Developing bias voltage
5 – 2
- 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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