Sharp SF-2414 Service Manual Page 83
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3. COPY DENSITY ADJUSTMENT
(1) Copy density adjustment timing
The copy density adjustment must be performed in the following
cases:
✱ When in maintenance.
✱ When the high voltage unit output current or voltage is adjusted.
✱ When the developing bias voltage is adjusted.
✱ When the copy lamp is replaced.
✱ When the optical section is cleaned.
✱ When an optical part is replaced.
✱ When the optical section is disassembled.
✱ When the photoconductor drum is replaced.
✱ When the developer is replaced.
✱ When the AE sensor is replaced.
✱ When the main control PWB is replaced.
✱ When the EEPROM on the main control PWB is replaced.
✱ When the memory trouble (U2) occurs.
✱ When a part of the copy lamp control circuit is replaced.
✱ When the AC power source PWB is replaced.
(2) Note for copy density adjustment
1) Necessary procedures before adjustment
✱ Clean the optical section.
✱ Clean the AE sensor.
✱ Clean or replace the charger wire.
✱ Check that the high voltage section voltage and the developing
bias voltage are in the specified range.
2) Note
✱ The auto mode copy density adjustment must be performed after
the normal mode copy density adjustment. Never reverse the se-
quence.
(3) Necessary items for the copy density adjustment
✱ Test chart
(Use one of the following three: UKOG-0162FCZZ, UKOG-
0089CSZZ, KODAK GRAY SCALE)
✱ B4 (14″ × 8 1/2″) white paper
Test chart comparison
UKOG-0162FCZZ
DENSITY No.
12345678910W
UKOG-0089CSZZ
DENSITY No.
0.1 0.2 0.3 0.5 1.9 0
KODAK GRAY
SCALE
123419A
SHARP CORPORATION
MADE IN JAPAN
(4) Copy density adjustment mode
The copy density adjustment must be performed in the following five
mode:
Copy density adjustment mode
Exposure
level
Sim No
Original
table copy
mode
Normal mode Non-toner-save mode 1 5 46-1
Toner save mode 1 5
Photo mode Non-toner-save mode 1 5
Auto mode Non-toner-save mode 1 5
Toner save mode 1 5
SPF copy
mode
Normal mode Non-toner-save mode Set to the
copy mode in
the original
table copy
mode.
51-6
Toner save mode
Photo mode Non-toner-save mode
Auto mode Non-toner-save mode
Toner save mode
(5) Copy density adjustment procedure
The copy density is adjusted by using Simulations 46 to change the
exposure level and the copy lamp voltage in each copy mode.
The copy density adjustment must be performed in the five modes.
To select each mode, use the copy mode select key.
In the SF-2214, copy density adjustment in the SPF copy mode is
also performed.
A. Test chart (UK0G-0162FCZZ) setting
1) Set the test chart and B4 (14″ × 8 1/2″) white paper on the original
table as shown below.
The sensing area of the AE sensor is about 120 mm wide from
the rear frame side edge on the original table glass. Place the
white paper on that area, but keep the test chart away from that
area.
2) Close the document cover.
3) Execute Sim 47.
4) Cancel the Sim 47 after off the copy lamp.
B. Normal copy mode (Non-toner-save mode) copy
density adjustment
1) Enter the simulations 46-1 mode.
2) Set the adjustment mode to the normal copy mode (Non-toner-
save mode).
(Press the copy mode select key to light the normal copy mode
lamp.)
1 10
W234
5
678
9
120mm
White paper
Test chart
Front side
51234
%
78%
64%
100%
TRAY SELECTEXPOSURE
AUTO
MANUAL
PHOTO
COPY RATIO
ZOOM
129%
117%
5
1
2
x
8
1
2
8
1
2
x
11
8
1
2
x
11 10 14
x
8
1
2
x
14
8
1
2
x
11
8
1
2
x
11
5
1
2
x
8
1
2
Copy mode lamp
Copy density display lamp
Copy sheet display
Copy mode
select key
Copy density
adjustment key
Lighting
7 – 26
- 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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