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AL-1551 COPY PROCESS 6-3
Step-3: Developing (DC bias)
A bias potential is applied to the MG roller in the two component
magnetic brush developing method, and the toner is charged negative
through friction with the carrier.
Non-image area of the drum surface charged with negative potential
repel the toner, whereas the laser exposed portions where no negative
charges exist, attract the toner. As a result, a visible image appears on
the drum surface.
Toner is attracted over the shadowed area because of the developing
bias.
Step-4: Transfer
The visible image on the drum surface is transferred onto the print paper
by applying a positive charge from the transfer corona to the backside of
the print paper.
Step-5: Separation
Since the print paper is charged positively by the transfer corona, it is
discharged by the separation corona. The separation corona is
connected to ground.
Step-6: Cleaning
Toner remaining on the drum is removed and collected by the cleaning
blade. It is transported to the waste toner collecting section in the
cleaning unit by the waste toner transport roller.
S
N
N
:Carrier (Magnetized particle)
:Toner (Charge negative by friction)
(N) (S) Permanent magnet
(provided in three locations)
MG roller
DC
400V 8V
About DC 5.2kV
- DIGITAL COPIER 1
- CAUTION 2
- CONTENTS 4
- [1] GENERAL 5
- [2] SPECIFICATIONS 6
- 3. Copy performance 8
- 4. Printer specifications 9
- [3] CONSUMABLE PARTS 10
- Production control 11
- 1. Appearance 12
- 2. Internal 12
- 1234567 891011 12 13
- 181716151413 13
- (AL-1551) 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
- 4 or 5 times 20
- Paper guide (B) 20
- Paper guide (A) 20
- 8. Power to copier 21
- B. Windows 98: 22
- C. Windows Me/Windows 2000: 22
- D. Windows 3.1x: 22
- 10.Parallel interface 23
- [6] COPY PROCESS 24
- 2. Outline of print process 25
- 3. Actual print process 25
- About DC 5.2kV 26
- Process controlling 27
- [7] OPERATIONAL DESCRIPTIONS 28
- 2. Scanner section 29
- No Component Function 30
- (1) Heat roller 31
- (2) Separator pawl 31
- (3) Thermal control 31
- (4) Fusing resistor 31
- 7. SPF section 35
- C. Operational descriptions 36
- A. Initial state 36
- B. Front copy 36
- Upper Side of Gate 37
- Gate OFF 37
- Transfer 38
- Lock pawl rear 38
- Lock pawl front 38
- 2. Operation panel section 39
- 3. Optical section 40
- Thermistor 41
- PPD2 sensor 42
- Hearter lamp 42
- Heat roller 43
- B. Disassembly procedure 44
- Clutch unit 48
- Paper feed 48
- Wire treatment 49
- 7. Rear frame section 52
- 8. Power section 53
- A. Sensor PWB 54
- B. Pickup solenoid 54
- C. Clutch 54
- F. SPF motor 55
- G. Paper entry sensor 55
- 10.2nd cassette section 56
- D. Transport roller 57
- E. Paper feed clutch 57
- F. 2nd paper feed roller 57
- B. Cassette detection switch 57
- C. Paper feed solenoid 57
- (1) Remove the rear cabinet 58
- (2) Remove the shield plate 58
- (3) Remove the RSPF 59
- (1) Remove the clutch unit 60
- (2) Remove the clutch 60
- J. Transport unit removal 61
- K. Belt 1 61
- (1) Remove the parts 62
- (2) Remove the parts 63
- (1) Remove the reverse gate 64
- (2) Remove the solenoid 64
- Fixing Screws 65
- Set screw 66
- Scanner unit drive pulley 66
- LL and LR: 67
- Distance between the copy 67
- (1) Outline 68
- Shizuoka 69
- (1) Lead edge adjustment 70
- Lens unit number 70
- ( ) direction 70
- Reference line (0) 70
- (+) direction 70
- 2.0mm or less 71
- 2. Copy density adjustment 72
- Non toner 73
- Toner save 73
- The front edge of the 74
- Front edge of paper 74
- [10]SIMULATION, TROUBLE CODES 75
- 2. List of simulations 76
- 4. Trouble codes 88
- [11]USER PROGRAM 89
- [12]ELECTRICAL SECTION 90
- B. MCU PWB unit 91
- (1) CPU signal table 92
- (2) ASIC (Signal table) 94
- 3. Reset circuit 99
- A. Outline 100
- 5. Driver circuit (Solenoid) 101
- 7. Main motor drive circuit 101
- 8. Mirror motor circuit 102
- 9. Duplex motor circuit 102
- A. Block diagram 103
- (1) Main section 104
- (2) FW signal 105
- (3) Heater lamp drive circuit 105
- (4) High voltage section 105
- 11.CL invertor PWB (circuit) 106
- 13.Operation section 107
- [13]CIRCUIT DIAGRAM 108
- AL-1551 CIRCUIT DIAGRAM 13-2 109
- AL-1551 CIRCUIT DIAGRAM 13-3 110
- AL-1551 CIRCUIT DIAGRAM 13-4 111
- AL-1551 CIRCUIT DIAGRAM 13-5 112
- AL-1551 CIRCUIT DIAGRAM 13-6 113
- AL-1551 CIRCUIT DIAGRAM 13-7 114
- AL-1551 CIRCUIT DIAGRAM 13-8 115
- AL-1551 CIRCUIT DIAGRAM 13-9 116
- GDI MEMORY PWB (6MB) 117
- POWER SUPPLY (120V/127V) 118
- POWER SUPPLY (200V Series) 119
- ACTUAL WIRING DIAGRAM 1/5 120
- AL-1551 CIRCUIT DIAGRAM 13-14 121
- AL-1551 CIRCUIT DIAGRAM 13-15 122
- AL-1551 CIRCUIT DIAGRAM 13-16 123
- AL-1551 CIRCUIT DIAGRAM 13-17 124
- CAUTION FOR BATTERY DISPOSAL 125
- COPYRIGHT 126
- 2001 BY SHARP CORPORATION 126
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