cf910_sm_engl.PDF

CF910

SERVICE MANUAL

1154-7990-11

CONTENTS

GENERAL

1. SAFETY INFORMATION ................................................................................... G-1

2. SPECIFICATIONS .............................................................................................G-6

3. PRECAUTIONS FOR INSTALLATION .............................................................. G-9

4. PRECAUTIONS FOR USE ................................................................................ G-10

5. HANDLING OF THE CONSUMABLES .............................................................. G-11

6. OTHER PRECAUTIONS .................................................................................... G-11

7. SYSTEM OPTIONS ........................................................................................... G-12

8. HIGHLIGHTS ..................................................................................................... G-13

MECHANICAL/ELECTRICAL

1. CROSS-SECTIONAL VIEW AND PAPER PATH .............................................. M-1

2. COPY PROCESS .............................................................................................. M-2

3. DRIVE SYSTEM ................................................................................................ M-5

4. OPERATING SEQUENCE ................................................................................. M-6

5. CONTROL BLOCK DIAGRAM ........................................................................... M-11

6. IMAGE STABILIZATION SYSTEM .................................................................... M-12

6-1. Image Stabilization System Overview ...................................................... M-12

6-2. Image Stabilization System Control .......................................................... M-13

7. PC DRUM SECTION ......................................................................................... M-16

7-1. Grounding of the PC Drum ....................................................................... M-16

7-2. PC Drum Drive Mechanism ......................................................................M-17

7-3. PC Drum Temperature Control ................................................................. M-18

8. PC DRUM CHARGING SECTION ..................................................................... M-19

8-1. PC Drum Charge Corona ON/OFF Control .............................................. M-19

8-2. PC Drum Charge Corona Wire Cleaning Mechanism .............................. M-20

8-3. PC Drum Charge Section Ozone Filter .................................................... M-21

9. IMAGE READER (IR) SECTION ........................................................................ M-22

9-1. IR Image Processing ................................................................................ M-23

9-2. CCD Sensor .............................................................................................M-32

9-3. Exposure Components Section ................................................................ M-33

9-4. Exposure Lamp Control ............................................................................ M-34

9-5. Scanner and 2nd/3rd Mirrors Carriage Movement Mechanism ................ M-35

9-6. Scanner Motor Drive Control .................................................................... M-36

9-7. IR Section Cooling Fan Motor Mechanism ............................................... M-38

9-8. Original Size Detecting Section ................................................................ M-39

10. PRINTERHEAD (PH) SECTION ......................................................................M-42

10-1. Image Processing Block Diagram .......................................................... M-43

10-2. Laser Exposure Process ........................................................................ M-45

10-3. Laser Emission Timing (SOS Signal) ..................................................... M-46

10-4. Laser Emission Area (HIA and VIA Signals) .......................................... M-47

10-5. LIMOS I and New Screen LIMOS ........................................................... M-48

11. DEVELOPING UNIT SECTION ....................................................................... M-49

11-1. Developing Unit Drive Mechanism ......................................................... M-51

11-2. Developer Flow ....................................................................................... M-53

11-3. Developing Bias and ATDC Bias ............................................................ M-55

11-4. ATDC Sensor ......................................................................................... M-56

11-5. AIDC Sensor ........................................................................................... M-58

11-6. Black Toner Replenishing Control .......................................................... M-59

11-7. Auxiliary Toner Replenishing Mechanism .............................................. M-61

11-8. Toner Suction Fan Motor ........................................................................ M-62

12. TONER HOPPER SECTION ........................................................................... M-63

12-1. Toner Replenishing Mechanism ............................................................. M-64

12-2. Toner Empty Detection Control .............................................................. M-66

13. PAPER TAKE-UP/FEED SECTION ................................................................. M-67

13-1. Universal Tray Paper Size Detection Mechanism .................................. M-68

13-2. Drawer-in-Position Detection Mechanism .............................................. M-70

13-3. Drawer Paper Lifting/Lowering Mechanism ............................................ M-71

13-4. Paper Empty Detection Mechanism ....................................................... M-73

13-5. Paper Take-Up Mechanism .................................................................... M-74

(1) Paper Separating Mechanism ........................................................... M-75

(2) Feed/Separator Roll Release Mechanism ......................................... M-75

(3) Paper Take-Up Roll Retracting Mechanism ...................................... M-76

13-6. Paper Dehumidifying Heaters and Humidity Sensor .............................. M-77

13-7. Vertical Transport Drive Mechanism ...................................................... M-78

13-8. Paper Take-Up Control ........................................................................... M-79

14. MANUAL FEED TABLE SECTION .................................................................. M-81

14-1. Manual Feed Paper Take-Up Mechanism .............................................. M-81

14-2. Manual Feed Take-Up Control ............................................................... M-82

14-3. Manual Take-Up Roll Pressure Mechanism ........................................... M-83

14-4. Manual Feed Paper Separating Mechanism .......................................... M-84

14-5. Manual Feed Paper Empty Detection Mechanism ................................. M-85

14-6. Manual Feed Paper Width Detection Mechanism .................................. M-86

14-7. Manual Feed Paper Length Detection Mechanism ................................ M-87

15. SYNCHRONIZING ROLLERS SECTION ........................................................ M-88

15-1. Synchronizing Roller Drive Mechanism .................................................. M-88

15-2. Synchronizing Roller Drive Control ......................................................... M-89

16. TRANSFER DRUM SECTION ......................................................................... M-90

16-1. Transfer Drum Drive Mechanism ............................................................ M-91

16-2. Paper Attraction ...................................................................................... M-92

(1) Static Charge Roller .......................................................................... M-93

(2) Backup Blade 2 ................................................................................. M-94

(3) Static Charge Corona ........................................................................ M-94

(4) Charge Neutralizing Cloth ................................................................. M-94

(5) Paper Attraction Detection (before image transfer) ........................... M-95

(6) Control ............................................................................................... M-95

16-3. Image Transfer Section .......................................................................... M-96

(1) Backup Blade 1 ................................................................................. M-97

(2) Image Transfer Corona ..................................................................... M-98

(3) Charge Neutralizing Cloth ................................................................. M-98

(4) Paper Attraction Detection (after image transfer) .............................. M-98

(5) Image Transfer Control ..................................................................... M-99

16-4. Paper Separation Section ....................................................................... M-100

(1) Paper Separation Lifting Finger ......................................................... M-101

(2) Paper Separator Corona ................................................................... M-101

(3) Paper Separator Finger ..................................................................... M-101

(4) Paper Separating Failure Detection Mechanism ............................... M-102

(5) Paper Holding Mechanism ................................................................ M-102

(6) Paper Separation Control .................................................................. M-103

16-5. Transfer Film Cleaning Mechanism ........................................................ M-104

16-6. Oil Cleaning ............................................................................................ M-105

(1) Oil Cleaning Backup Brush ............................................................... M-106

(2) Oil Roller ............................................................................................ M-106

(3) Oil Cleaning Control .......................................................................... M-107

16-7. Toner Cleaning ....................................................................................... M-108

(1) Toner Cleaning Backup Brush .......................................................... M-109

(2) Fur Brush Unit ................................................................................... M-109

(3) Fur Brush Roller/Toner Collecting Roller ........................................... M-110

(4) Fur Brush Control .............................................................................. M-111

16-8. Charge Neutralizing ................................................................................ M-112

16-9. Transfer Drum Retraction Mechanism .................................................... M-113

17. PC DRUM CLEANING SECTION .................................................................... M-114

17-1. Pre-Cleaning Charge Corona ................................................................. M-114

17-2. PC Drum Cleaning .................................................................................. M-115

17-3. Ozone Exhaust from Pre-Cleaning Charge Corona and Transfer Drum M-116

18. MAIN ERASE SECTION .................................................................................. M-117

19. FUSING UNIT SECTION ................................................................................. M-118

19-1. Fusing Unit Drive Mechanism ................................................................. M-119

(1) Upper Fusing Roller .......................................................................... M-119

(2) Lower Fusing Roller .......................................................................... M-119

(3) Fusing Rollers Drive Mechanism ....................................................... M-120

(4) Fusing Rollers Drive Control ............................................................. M-121

(5) Fusing Speed Switching Control ....................................................... M-121

19-2. Fusing Roller Pressure Mechanism ........................................................ M-122

19-3. Fusing Temperature Control ................................................................... M-123

19-4. Fusing Oil Application/Collection Mechanism ......................................... M-125

(1) Fusing Oil Application Drive Mechanism ........................................... M-126

20. EXIT UNIT SECTION ....................................................................................... M-127

21. HORIZONTAL TRANSPORT UNIT SECTION ................................................ M-128

22. POWER SUPPLY ............................................................................................ M-130

22-1. Power Lines When the Power Cord is Plugged in .................................. M-130

22-2. Power Lines When the Power Switch is Turned ON .............................. M-131

22-3. Power Supplies ON/OFF Control ........................................................... M-132

22-4. CPU Reset Function ............................................................................... M-132

22-5. Power Supply Cooling Mechanism ......................................................... M-132

23. MEMORY BACKUP ......................................................................................... M-133

iii

1154SBG0100A

SAFETY INFORMATION

This copy machine is a digital copy machine which operates by means of a laser. There is

no possibility of danger from the laser, provided the copy machine is operated according to

the instructions provided in this manual. Since radiation emitted by the laser is completely

confined within protective housing, the laser beam cannot escape from the machine during

any phase of user operation.

This copy machine is certified as a Class 1 laser product. This means the copy machine

does not produce hazardous laser radiation.

LUOKAN 1 LASERLAlTE

KLASS 1 LASER APPARAT

CAUTION

The use of controls, adjustments or performance of procedures other than those specified

in this manual may result in hazardous radiation exposure. Because of this, Minolta

strongly recommends that you operate your copy machine only as described in this docu-

mentation.

For United States Users:

Laser Safety

This copy machine is certified as a Class 1 Laser product under the U.S. Department of

Health and Human Services (DHHS) Radiation Performance Standard according to the

Radiation Control for Health and Safety Act of 1968. This means that the copy machine

does not produce hazardous laser radiation.

CDRH Regulations

The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Admin-

istration implemented regulations for laser products on August 2, 1976.

Compliance is mandatory for products marketed in the United States. The label shown

below indicates compliance with the CDRH regulations and must be attached to laser prod-

ucts marketed in the United States.

WARNING

Use of controls, adjustments or performance of procedures other than those specified in

this manual may result in hazardous radiation exposure.

Internal Laser Radiation

Maximum Radiation Power: 8mW

Wave Length: 780nm

G-1

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