Ricoh af 850 Service Manual s af1085

TABLE OF CONTENTS

1. OVERALL MACHINE INFORMATION........................................ 1-1
1.1 SPECIFICATIONS.....................................................................................1-1
1.1.1 COPIER ENGINE.............................................................................1-1
1.1.2 ADF ..................................................................................................1-4
1.2 MACHINE CONFIGURATION...................................................................1-5
1.3 COMPONENT LAYOUT............................................................................1-6
1.3.1 COPIER ENGINE.............................................................................1-6
1.3.2 ADF ..................................................................................................1-7
1.5 COPY PROCESS......................................................................................1-9
1.6 DRIVE LAYOUT......................................................................................1-11
1.6.1 COPIER ENGINE...........................................................................1-11
1.6.2 ADF ................................................................................................1-12
1.7 ELECTRICAL COMPONENT DESCRIPTIONS......................................1-13
1.7.1 COPIER ENGINE...........................................................................1-13
1.7.2 ADF ................................................................................................1-19
2. DETAILED SECTION DESCRIPTIONS ...................................... 2-1
2.1 DOCUMENT FEEDER..............................................................................2-1
2.1.1 PICK-UP ROLLER RELEASE..........................................................2-1
2.1.2 BOTTOM PLATE LIFT......................................................................2-2
2.1.3 PICK-UP AND SEPARATION ..........................................................2-3
2.1.4 ORIGINAL FEED..............................................................................2-4
2.1.5 ORIGINAL SIZE DETECTION..........................................................2-5
2.1.6 ORIGINAL TRANSPORT.................................................................2-6
2.1.7 ORIGINAL SKEW CORRECTION....................................................2-7
2.1.8 ORIGINAL INVERSION AND FEED-OUT........................................2-8
2.1.9 JAM CONDITIONS.........................................................................2-12
2.2 SCANNING..............................................................................................2-13
2.2.1 OVERVIEW....................................................................................2-13
2.2.2 SCANNER DRIVE..........................................................................2-14
2.2.3 ORIGINAL SIZE DETECTION IN BOOK MODE............................2-15
2.3 IMAGE PROCESSING............................................................................2-17
2.3.1 OVERVIEW....................................................................................2-17
2.3.2 SBU................................................................................................2-18
2.3.3 AUTO IMAGE DENSITY (ADS)......................................................2-19
2.3.4 IMAGE PROCESSING STEPS AND RELATED SP MODE...........2-20
2.3.5 AUTO SHADING............................................................................2-26
2.3.6 BACKGROUND ERASE.................................................................2-27
2.3.7 INDEPENDENT DOT ERASE........................................................2-28
2.3.8 FILTERING, MAIN SCAN MAGNIFICATION/REDUCTION...........2-29
2.3.9 GAMMA (γ) CORRECTION............................................................2-31
2.3.10 GRADATION PROCESSING .......................................................2-31
2.3.11 LINE WIDTH CORRECTION........................................................2-32
A294 II-i
2.4 LASER EXPOSURE................................................................................2-33
2.4.1 OVERVIEW....................................................................................2-33
2.4.2 OPTICAL PATH..............................................................................2-34
2.4.3 AUTO POWER CONTROL (APC)..................................................2-35
2.4.4 FOUR BEAM LASER WRITING.....................................................2-36
2.4.5 LD SAFETY SWITCHES................................................................2-37
2.5 DRUM UNIT ............................................................................................2-38
2.5.1 PROCESS CONTROL....................................................................2-38
2.5.2 TONER DENSITY CONTROL........................................................2-43
2.5.3 DRUM UNIT COMPONENTS.........................................................2-46
2.5.4 DRIVE.............................................................................................2-47
2.5.5 DRUM CHARGE.............................................................................2-48
2.5.6 DRUM CLEANING..........................................................................2-50
2.5.7 OTHERS.........................................................................................2-53
2.6 DEVELOPMENT.....................................................................................2-56
2.6.1 OVERVIEW....................................................................................2-56
2.6.2 DEVELOPMENT MECHANISM......................................................2-57
2.6.3 DRIVE.............................................................................................2-58
2.6.4 CROSSMIXING..............................................................................2-59
2.6.5 DEVELOPMENT BIAS...................................................................2-60
2.7 TONER SUPPLY AND RECYCLING ......................................................2-61
2.7.1 TONER BANK................................................................................2-61
2.7.2 SUPPLYING TONER TO THE DEVELOPMENT UNIT..................2-65
2.7.3 TONER HOPPER...........................................................................2-66
2.7.4 TONER RECYCLING AND WASTE TONER COLLECTION..........2-68
2.8 PAPER FEED..........................................................................................2-71
2.8.1 OVERVIEW....................................................................................2-71
2.8.2 DRIVE.............................................................................................2-72
2.8.3 PAPER LIFT – TRAYS 2 & 3..........................................................2-73
2.8.4 PICK-UP AND FEED – TRAYS 1 TO 3..........................................2-75
2.8.5 REMAINING PAPER/
PAPER END DETECTION – TRAYS 2 & 3....................................2-79
2.8.6 PAPER SIZE DETECTION – TRAYS 2 & 3....................................2-80
2.8.7 TRAY LOCK – TRAYS 2 & 3..........................................................2-81
2.8.8 TANDEM FEED – TRAY 1 .............................................................2-82
2.8.9 VERTICAL TRANSPORT...............................................................2-89
2.8.10 PAPER REGISTRATION..............................................................2-90
2.9 IMAGE TRANSFER AND PAPER SEPARATION...................................2-93
2.9.1 OVERVIEW....................................................................................2-93
2.9.2 IMAGE TRANSFER AND PAPER SEPARATION..........................2-94
2.9.3 TRANSFER BELT UNIT LIFT.........................................................2-96
2.9.4 PAPER TRANSPORTATION AND BELT DRIVE...........................2-97
2.9.5 TRANSFER BELT CLEANING.......................................................2-98
2.9.6 TONER COLLECTION...................................................................2-99
2.9.7 TRANSFER ANTI-CONDENSATION HEATER............................2-100
2.10 FUSING...............................................................................................2-101
2.10.1 OVERVIEW................................................................................2-101
2.10.2 FUSING ENTRANCE GUIDE.....................................................2-102
2.10.3 FUSING UNIT DRIVE.................................................................2-103
A294 II-ii
2.10.4 FUSING LAMP CONTROL.........................................................2-104
2.10.5 OIL SUPPLY AND CLEANING...................................................2-105
2.10.6 PAPER COOLING......................................................................2-106
2.10.7 FUSING PRESSURE.................................................................2-107
2.10.8 HOT ROLLER STRIPPER RELEASE........................................2-108
2.11 PAPER EXIT/DUPLEX........................................................................2-109
2.11.1 OVERVIEW................................................................................2-109
2.11.2 PAPER EXIT MECHANISM........................................................2-110
2.11.3 DUPLEX DRIVE MECHANISM ..................................................2-111
2.11.4 INVERTER .................................................................................2-112
2.11.5 DUPLEX TRAY FEED MECHANISM.........................................2-114
2.11.6 BASIC DUPLEX FEED OPERATION.........................................2-115
2.12 ENERGY SAVER MODES..................................................................2-119
2.12.1 OVERVIEW................................................................................2-119
2.12.2 ENERGY SAVER (PANEL OFF) MODE ....................................2-120
2.12.3 LOW POWER MODE.................................................................2-121
2.12.4 OFF MODE.................................................................................2-122
2.12.5 SUMMARY.................................................................................2-124
2.13 OTHERS .............................................................................................2-125
2.13.1 OPERATION UNIT.....................................................................2-125
2.13.2 DOOR SAFETY SWITCH LOCK TOOLS...................................2-126
2.13.3 HDD CONTROL.........................................................................2-127
2.13.4 DATA PATH THROUGH THE INTERFACE BOARD.................2-129
3. INSTALLATION PROCEDURE................................................... 3-1
3.1 INSTALLATION REQUIREMENTS...........................................................3-1
3.1.1 ENVIRONMENT...............................................................................3-1
3.1.2 MACHINE LEVEL.............................................................................3-1
3.1.3 MINIMUM SPACE REQUIREMENTS...............................................3-2
3.1.4 POWER REQUIREMENTS..............................................................3-2
3.2 COPIER (A294).........................................................................................3-3
3.2.1 ACCESSORY CHECK......................................................................3-3
3.2.2 INSTALLATION PROCEDURE........................................................3-5
3.3 FINISHER INSTALLATION (B302)..........................................................3-12
3.3.1 ACCESSORY CHECK....................................................................3-12
3.3.2 INSTALLATION PROCEDURE......................................................3-13
3.4 LCT INSTALLATION (B303)....................................................................3-16
3.4.1 ACCESSORY CHECK....................................................................3-16
3.4.2 INSTALLATION PROCEDURE......................................................3-17
3.5 PUNCH UNIT INSTALLATION (A812)....................................................3-19
3.5.1 ACCESSORY CHECK....................................................................3-19
3.5.2 PUNCH UNIT INSTALLATION.......................................................3-20
3.6 A3/DLT TRAY (B331)..............................................................................3-23
3.6.1 ACCESSORY CHECK....................................................................3-23
3.6.2 INSTALLATION PROCEDURE......................................................3-24
3.7 KEY COUNTER INSTALLATION............................................................ 3-27
3.8 INTERFACE BOARD
(CD-RW/TANDEM COPY KIT/PRINTER CONTROLLER)......................3-30
3.8.1 INSTALLATION PROCEDURE......................................................3-30
A294 II-iii
4 SERVICE TABLES....................................................................... 4-1
4.1 GENERAL CAUTIONS..............................................................................4-1
4.1.1 DRUM...............................................................................................4-1
4.1.2 DRUM UNIT .....................................................................................4-1
4.1.3 TRANSFER BELT UNIT...................................................................4-2
4.1.4 SCANNER UNIT...............................................................................4-2
4.1.5 LASER UNIT ....................................................................................4-2
4.1.6 CHARGE CORONA..........................................................................4-3
4.1.7 DEVELOPMENT ..............................................................................4-3
4.1.8 CLEANING.......................................................................................4-4
4.1.9 FUSING UNIT...................................................................................4-4
4.1.10 PAPER FEED.................................................................................4-4
4.1.11 USED TONER................................................................................4-4
4.2 SERVICE PROGRAM MODE....................................................................4-5
4.2.1 SERVICE PROGRAM MODE OPERATION.....................................4-5
4.2.2 SERVICE PROGRAM MODE TABLES..........................................4-10
4.2.3 TEST PATTERN PRINTING (SP2-902) .........................................4-59
4.2.4 INPUT CHECK...............................................................................4-60
4.2.5 OUTPUT CHECK...........................................................................4-68
4.2.6 SYSTEM PARAMETER AND DATA LISTS (SMC LISTS) .............4-70
4.2.7 MEMORY ALL CLEAR (SP5-801)..................................................4-70
4.2.8 SOFTWARE RESET......................................................................4-71
4.2.9 SYSTEM SETTING AND
COPY SETTING (UP MODE) RESET............................................4-71
4.3 PM COUNTER ........................................................................................4-72
4.3.1 PM COUNTER ACCESS PROCEDURE........................................4-72
4.4 PROGRAM DOWNLOAD........................................................................4-78
4.5 NVRAM DATA DOWNLOAD...................................................................4-80
4.6 LANGUAGE DATA DOWNLOAD............................................................4-81
4.7 STAMP DATA DOWNLOAD....................................................................4-81
4.8 USER PROGRAM MODE.......................................................................4-82
4.8.1 HOW TO ENTER AND EXIT UP MODE.........................................4-82
4.8.2 UP MODE TABLE ..........................................................................4-82
4.8.3 IMAGE QUALITY SETTING BY UP MODE....................................4-85
4.8.4 LEDS..............................................................................................4-91
4.9 TEST POINTS/DIP SWITCHES/LEDS....................................................4-92
4.9.1 DIP SWITCHES..............................................................................4-92
4.9.2 TEST POINTS................................................................................4-93
4.9.3 FUSES............................................................................................4-93
4.9.4 VARIABLE RESISTORS................................................................4-93
4.10 SPECIAL TOOLS AND LUBRICANTS..................................................4-94
4.10.1 SPECIAL TOOLS.........................................................................4-94
4.10.2 LUBRICANTS...............................................................................4-94
5 PREVENTIVE MAINTENANCE SCHEDULE............................... 5-1
5.1 PM PARTS................................................................................................5-1
A294 II-iv
6. REPLACEMENT AND ADJUSTMENT........................................ 6-1
6.1 EXTERIOR................................................................................................6-1
6.1.1 FRONT.............................................................................................6-1
6.1.2 RIGHT ..............................................................................................6-2
6.1.3 LEFT.................................................................................................6-3
6.1.4 REAR................................................................................................6-4
6.2 DOCUMENT FEEDER..............................................................................6-5
6.2.1 COVER REMOVAL..........................................................................6-5
6.2.2 FEED UNIT REMOVAL AND
SEPARATION ROLLER REPLACEMENT .......................................6-7
6.2.3 FEED BELT REPLACEMENT..........................................................6-8
6.2.4 PICK-UP ROLLER REPLACEMENT................................................6-9
6.2.5 SENSOR REPLACEMENT.............................................................6-10
6.2.6 TRANSPORT BELT REPLACEMENT............................................6-14
6.2.7 MOTOR REPLACEMENT..............................................................6-15
6.2.8 FEED-IN CLUTCH REPLACEMENT..............................................6-17
6.3 SCANNER UNIT......................................................................................6-18
6.3.1 EXPOSURE GLASS.......................................................................6-18
6.3.2 LENS BLOCK.................................................................................6-19
6.3.3 ORIGINAL SIZE SENSORS...........................................................6-20
6.3.4 EXPOSURE LAMP.........................................................................6-21
6.3.5 LAMP REGULATOR.......................................................................6-22
6.3.6 OPTICS DUST FILTER..................................................................6-23
6.3.7 SCANNER H.P. SENSOR..............................................................6-24
6.3.8 SCANNER MOTOR........................................................................6-25
6.3.9 SCANNER DRIVE WIRES .............................................................6-26
6.4 LASER UNIT...........................................................................................6-29
6.4.1 CAUTION DECAL LOCATIONS.....................................................6-29
6.4.2 LDB AND LD FILTER REPLACEMENT .........................................6-30
6.4.3 POLYGON MIRROR MOTOR REPLACEMENT ............................6-31
6.4.4 LASER SYNCHRONIZATION DETECTOR REPLACEMENT........6-32
6.5 DRUM UNIT ............................................................................................6-33
6.5.1 DRUM UNIT REMOVAL AND DRUM REPLACEMENT.................6-33
6.5.2 QUENCHING LAMP REPLACEMENT...........................................6-34
6.5.3 GRID PLATE/CHARGE CORONA WIRE/
WIRE CLEANER REPLACEMENT ................................................6-35
6.5.4 DRUM POTENTIAL SENSOR REPLACEMENT............................6-37
6.5.5 CLEANING BLADE/ID SENSOR REPLACEMENT........................6-38
6.5.6 CLEANING BRUSH REPLACEMENT............................................6-39
6.5.7 PICK-OFF PAWL REPLACEMENT................................................6-40
6.5.8 DRUM FILTER REPLACEMENT....................................................6-41
6.6 DEVELOPMENT AND TONER SUPPLY................................................6-42
6.6.1 DEVELOPMENT UNIT REMOVAL.................................................6-42
6.6.2 DEVELOPER REPLACEMENT......................................................6-43
6.6.3 DEVELOPMENT AND AIR DUST FILTER REPLACEMENT.........6-45
6.6.4 DEVELOPMENT ENTRANCE, FRONT, AND
REAR SIDE SEALS........................................................................6-46
6.6.5 TONER DENSITY SENSOR REPLACEMENT...............................6-47
A294 II-v
6.6.6 TONER HOPPER SENSOR REPLACEMENT...............................6-48
6.6.7 DEVELOPMENT MOTOR REPLACEMENT ..................................6-49
6.6.8 DEVELOPMENT ROLLER SHAFT CLEANING.............................6-50
6.7 TRANSFER BELT UNIT..........................................................................6-51
6.7.1 TRANSFER BELT UNIT REMOVAL/INSTALLATION....................6-51
6.7.2 TRANSFER BELT REPLACEMENT...............................................6-53
6.7.3 TRANSFER BELT CLEANING BLADE REPLACEMTNT...............6-55
6.7.4 TRANSFER BELT BIAS BRUSH REPLACEMENT........................6-56
6.8 PAPER FEED..........................................................................................6-57
6.8.1 PAPER TRAY REMOVAL..............................................................6-57
6.8.2 PAPER FEED ROLLER REPLACEMENT......................................6-60
6.8.3 PAPER FEED AND VERTICAL TRANSPORT CLUTCH, AND TRAY LIFT, PAPER FEED, AND
PAPER END SENSOR REMOVAL...............................................6-61
6.8.4 REAR FENCE RETURN SENSOR REPLACEMENT.....................6-64
6.8.5 REAR FENCE HP SENSOR REPLACEMENT...............................6-65
6.8.6 RIGHT 1ST TRAY PAPER SENSOR REPLACMENT....................6-66
6.8.7 BOTTOM PLATE LIFT WIRE REPLACEMENT .............................6-67
6.8.8 PAPER DUST REMOVER CLEANING..........................................6-69
6.8.9 REGISTRATION SENSOR CLEANING.........................................6-70
6.8.10 UNIVERSAL TRAY SIZE SWITCH REPLACEMENT...................6-71
6.8.11 1ST TRAY LIFT MOTOR REMOVAL ...........................................6-72
6.8.12 LIFT MOTOR REMOVAL (2ND & 3RD TRAYS)...........................6-73
6.8.13 PAPER FEED MOTOR REMOVAL..............................................6-74
6.8.14 RELAY MOTOR, UPPER RELAY CLUTCH,
LCT RELAY CLUTCH REMOVAL................................................6-75
6.8.15 REGISTRATION MOTOR REMOVAL..........................................6-76
6.8.16 COPIER FEED UNIT/DEVELOPMENT FAN MOTOR
REMOVAL....................................................................................6-77
6.8.17 LCT RELAY AND RELAY SENSOR REMOVAL..........................6-78
6.8.18 TANDEM FEED TRAY PAPER SIZE CHANGE...........................6-79
6.8.19 MECHANICAL SIDE REGISTRATION ADJUSTMENT................6-82
6.9 FUSING UNIT..........................................................................................6-83
6.9.1 OIL SUPPLY & CLEANING WEB UNIT REMOVAL.......................6-83
6.9.2 HOT ROLLER UNIT REMOVAL AND
PRESSURE ROLLER REPLACEMENT.........................................6-84
6.9.3 HOT ROLLER REPLACEMENT.....................................................6-86
6.9.4 OIL SUPPLY & CLEANING WEB REPLACEMENT.......................6-88
6.9.5 WEB CLEANING ROLLER REPLACEMENT.................................6-90
6.9.6 HOT ROLLER STRIPPER REPLACEMENT..................................6-91
6.9.7 PRESSURE ROLLER STRIPPER REPLACEMENT......................6-92
6.9.8 PRESSURE ROLLER CLEANING ROLLER REPLACEMENT......6-93
6.9.9 FUSING AND EXIT UNIT REMOVAL.............................................6-94
6.9.10 FUSING PRESSURE ADJUSTMENT..........................................6-95
6.10 PAPER EXIT/DUPLEX UNIT.................................................................6-96
6.10.1 EXIT SENSOR REPLACEMENT..................................................6-96
6.10.2 DUPLEX UNIT REMOVAL ...........................................................6-97
6.10.3 DUPLEX UNIT INNER COVER REMOVAL..................................6-98
6.10.4 JOGGER MOTOR REPLACEMENT ............................................6-99
A294 II-vi
6.10.5 DUPLEX UNIT CLUTCH REPLACEMENT.................................6-100
6.10.6 DUPLEX ENTRANCE SENSOR REPLACEMENT.....................6-101
6.10.7 DUPLEX TRANSPORT SENSORS 2 & 3 ..................................6-102
6.10.8 DUPLEX TRANSPORT SENSOR 1/
DUPLEX INVERTER SENSOR..................................................6-103
6.11 TONER BANK.....................................................................................6-104
6.11.1 WASTE TONER BOTTLE REMOVAL........................................6-104
6.11.2 TONER BANK UNIT REMOVAL ................................................6-105
6.11.3 TONER SUPPLY MOTOR AND
TONER SUPPLY MOTOR SENSOR REMOVAL.......................6-108
6.11.4 ACCESS TO INSIDE THE TONER BANK..................................6-109
6.12 BOARDS AND OTHER ITEMS...........................................................6-110
6.12.1 SICU BOARD.............................................................................6-110
6.12.2 HARD DISK DRIVE....................................................................6-111
6.12.3 BCU BOARD..............................................................................6-112
6.12.4 I/O BOARD.................................................................................6-113
6.12.5 PSU............................................................................................6-114
6.12.6 CHARGE/GRID/BIAS POWER PACK........................................6-115
6.12.7 FUSING/DUPLEX MOTOR REPLACEMENT.............................6-116
6.12.8 DRUM MOTOR REPLACEMENT...............................................6-117
6.13 COPY IMAGE ADJUSTMENT: PRINTING/SCANNING......................6-118
6.13.1 PRINTING ..................................................................................6-118
6.13.2 PARALLELOGRAM IMAGE ADJUSTMENT ..............................6-121
6.13.3 SCANNING.................................................................................6-123
6.13.4 ADF IMAGE ADJUSTMENT.......................................................6-124
6.14 TOUCH SCREEN CALIBRATION.......................................................6-125
7 TROUBLESHOOTING ................................................................. 7-1
7.1 SERVICE CALL CONDITIONS.................................................................7-1
7.1.1 SUMMARY.......................................................................................7-1
7.1.2 SC CODE DESCRIPTIONS .............................................................7-2
7.2 ELECTRICAL COMPONENT DEFECTS ................................................7-37
7.2.1 SENSORS......................................................................................7-37
7.2.2 SWITCHES.....................................................................................7-41
7.3 BLOWN FUSE CONDITIONS.................................................................7-42
A294 II-vii

OPTION

3,000-SHEET FINISHER (B302)

1. OVERALL MACHINE INFORMAT ION..................................B302-1
1.1 SPECIFICATIONS.............................................................................. B302-1
1.2 MECHANICAL COMPONENT LAYOUT ............................................ B302-3
1.3 ELECTRICAL COMPONENT DESCRIPTION.................................... B302-4
1.4 DRIVE LAYOUT................................................................................. B302-6
2. DETAILED DESCRIPTIONS.................................................B302-7
2.1 TRAY AND STAPLER JUNCTION GATE.......................................... B302-7
2.2 PAPER PRE-STACKING ................................................................... B302-8
2.3 JOGGER UNIT PAPER POSITIONING ............................................. B302-9
2.4 STAPLER UNIT MOVEMENT.......................................................... B302-10
2.5 STAPLER......................................................................................... B302-12
2.6 FEED-OUT....................................................................................... B302-14
2.7 SHIFT TRAY UP/DOWN MOVEMENT............................................. B302-15
2.8 SHIFT TRAY SIDE-TO-SIDE MOVEMENT...................................... B302-16
2.9 PUNCH UNIT DRIVE ....................................................................... B302-17
2.10 PUNCH WASTE COLLECTION..................................................... B302-18
2.11 JAM CONDITIONS......................................................................... B302-19
3. SERVICE TABLES..............................................................B302-20
3.1 DIP SWITCHES................................................................................ B302-20
3.2 TEST POINTS.................................................................................. B302-20
3.3 FUSES ............................................................................................. B302-20
4. REPLACEMENT AND ADJUSTMENT................................B302-21
4.1 COVER REPLACEMENT................................................................. B302-21
4.2 POSITIONING ROLLER REPLACEMENT ....................................... B302-24
4.3 ALIGNMENT BRUSH ROLLER REPLACEMENT............................ B302-25
4.4 SENSOR REPLACEMENT .............................................................. B302-26
4.4.1 STACK HEIGHT 1, 2 AND EXIT GUIDE OPEN SENSOR...... B302-26
4.4.2 UPPER TRAY PAPER LIMIT AND EXIT SENSOR................. B302-27
4.4.3 SHIFT TRAY EXIT SENSOR................................................... B302-28
4.4.4 ENTRANCE AND
STAPLER TRAY ENTRANCE SENSORS .............................. B302-29
4.4.5 PRE-STACK STOPPER SENSOR .......................................... B302-30
4.4.6 STAPLE WASTE HOPPER SENSOR..................................... B302-31
4.4.7 STAPLER ROTATION HP AND
STAPLER RETURN SENSORS.............................................. B302-32
4.5 STAPLER REMOVAL....................................................................... B302-33
4.6 PUNCH POSITION ADJUSTMENT.................................................. B302-34
A294 II-viii

LCT (B303)

1. OVERALL MACHINE INFORMAT ION..................................B303-1
1.1 SPECIFICATIONS.............................................................................. B303-1
1.2 MECHANICAL COMPONENT LAYOUT ............................................ B303-2
1.3 ELECTRICAL COMPONENT DESCRIPTIONS................................. B303-3
1.4 DRIVE LAYOUT................................................................................. B303-5
2. DETAILED DESCRIPTIONS.................................................B303-6
2.1 PAPER FEED..................................................................................... B303-6
2.2 PICK-UP AND FEED.......................................................................... B303-7
2.2.1 OVERVIEW............................................................................... B303-7
2.2.2 PICK-UP AND FEED................................................................. B303-8
2.2.3 SEPARATION ROLLER RELEASE........................................... B303-9
2.3 PAPER LIFT..................................................................................... B303-10
2.3.1 TRAY DETECTION................................................................. B303-10
2.3.2 LIFT MECHANISM.................................................................. B303-10
2.3.3 LIFT SENSOR......................................................................... B303-11
2.4 PAPER SIZE DETECTION............................................................... B303-12
2.5 PAPER END DETECTION............................................................... B303-13
3. REPLACEMENT AND ADJUSTMENT................................B303-14
3.1 EXTERIOR COVER REMOVAL....................................................... B303-14
3.2 INNER COVER REMOVAL.............................................................. B303-15
3.3 PAPER FEED ROLLER REPLACEMENT........................................ B303-16
3.4 LCT MOTOR REPLACEMENT.........................................................B303-17
3.5 RELAY SENSOR REPLACEMENT.................................................. B303-18
3.6 PAPER HEIGHT SENSOR AND
PAPER SIZE SWITCH REPLACEMENT ......................................... B303-19
3.7 MAIN DRIVE BELT REPLACEMENT............................................... B303-20
3.8 SIDE REGISTRATION ADJUSTMENT............................................ B303-21

A3/DLT TRAY KIT (B331)

1. OVERALL MACHINE INFORMAT ION..................................B331-1
1.1 SPECIFICATIONS.............................................................................. B331-1
2. DETAILED DESCRIPTIONS.................................................B331-2
2.1 SECTIONAL DESCRIPTION.............................................................. B331-2
3. REPLACEMENT AND ADJUSTMENT..................................B331-3
3.1 BOTTOM PLATE LIFT WIRE REPLACEMENT................................. B331-3
A294 II-ix
CHANGES MADE FROM THE A294 I / A295 I MODELS
1 DETAILED SECTION DESCRIPTIONS ............................. A294 II-1
1.1 TONER AND DEVELOPER.............................................................A294 II-1
1.2 NEWLY ADDED: DEVELOPMENT S UCTION MOTOR AND
SUCKED TONER COLLECTION BOTTLE.....................................A294 II-1
1.3 DEVELOPMENT UNIT....................................................................A294 II-2
1.4 TONER BANK UNIT........................................................................A294 II-3
1.5 CLEANING UNIT.............................................................................A294 II-3
1.6 FUSING UNIT..................................................................................A294 II-4
1.7 NEW ADDITIONS TO TRANSFER CURRENT CONTROL ............A294 II-5
1.8 CHARGE CORONA UNIT...............................................................A294 II-6
1.9 ELECTRICAL COMPONENTS........................................................A294 II-6
2 SERVICE TABLES.............................................................A294 II-9
2.1 SERVICE PROGRAM MODE..........................................................A294 II-9
3 PREVENTIVE MAINTENANCE SCHEDULE................... A294 II-13
3.1 PM PARTS....................................................................................A294 II-13
4 TROUBLESHOOTING ..................................................... A294 II-14
4.1 SERVICE CALL CONDITIONS.....................................................A294 II-14
A294 II-x
18 July, 2001 GENERAL CAUTIONS

4. SERVICE TABLES

4.1 GENERAL CAUTIONS

Do not turn off either of the power switches while any of the electrical components are active. Doing so might cause damage to units such as the transfer belt, drum, and development unit when they are pulled out of or put back into the copier.

4.1.1 DRUM

An organic photoconductor (OPC) drum is more sensitive to light and ammonia gas than a selenium drum. Follow the cautions below when handling an OPC drum.
1. Never expose the drum to direct sunlight.
2. Never expose the drum to direct light of more than 1,000 Lux for more than a minute.
3. Never touch the drum surface with bare hands. When the drum surface is touched with a finger or becomes dirty, wipe it with a dry cloth or clean it with wet cotton. Wipe with a dry cloth after cleaning with wet cotton.
4. Never use alcohol to clean the drum; alcohol dissolves the drum surface.
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5. Store the drum in a cool, dry place away from heat.
6. Take care not to scratch the drum as the drum layer is thin and is easily damaged.
7. Never expose the drum to corrosive gases such as ammonia gas.
8. Always keep the drum in the protective sheet when keeping the drum unit, or the drum itself, out of the copier. Doing so avoids exposing it to bright light or direct sunlight, and will protect it from light fatigue.
9. Dispose of used drums in accordance with local regulations.
10. When installing a new drum, do the Auto Process Control Data Adjustment (SP 2-962).

4.1.2 DRUM UNIT

1. Before pulling out the drum unit, place a sheet of paper under the drum unit to catch any spilt toner.
2. Make sure that the drum unit is set in position and the drum stay is secured with a screw before the main switch is turned on. If the drum unit is loose, poor contact of the drum connectors may cause electrical noise, resulting in unexpected malfunctions (RAM data change is the worst case).
3. To prevent drum scratches, remove the development unit before removing the drum unit.
4-1
GENERAL CAUTIONS 18 July, 2001

4.1.3 TRANSFER BELT UNIT

1. Never touch the transfer belt surface with bare hands.
2. Take care not to scratch the transfer belt, as the surface is easily damaged.
3. Before installing the new transfer belt, clean all the rollers and the inner p art of the transfer belt with a dry cloth to prevent the belt from slipping.

4.1.4 SCANNER UNIT

1. When installing the exposure glass, make sure that the white p aint is at the rear left corner.
2. Clean the exposure glass with alcohol or glass cleaner to reduce the amount of static electricity on the glass surface.
3. Use a cotton pad with water or a blower brush to clean the mirrors and lens.
4. Do not bend or crease the exposure lamp flat cable.
5. Do not disassemble the lens unit. Doing so will throw the lens and the copy image out of focus.
6. Do not turn any of the CCD positioning screws. Doing so will throw the CCD out of position.

4.1.5 LASER UNIT

1. Do not loosen the screws that secure the LD drive board to the laser diode casing. Doing so would throw the LD unit out of adjustment.
2. Do not adjust the variable resistors on the LD unit, as they are adjusted in the factory.
3. The polygon mirror and F-theta lenses are very sensitive to dust. Do not open the optical housing unit.
4. Do not touch the glass surface of the polygon mirror motor unit with bare hands.
4-2
18 July, 2001 GENERAL CAUTIONS

4.1.6 CHARGE CORONA

1. Clean the corona wires with a dry cloth. Do not use sandpaper or solvent.
2. Clean the charge corona casing with water first to remove NOx based compounds. Then clean it with alcohol if any toner still remains on the casing.
3. Clean the end block with a blower brush first to remove toner and paper dust. Then clean with alcohol if any toner still remains.
4. Do not touch the corona wires with bare hands. Oil stains from fingers may cause uneven image density on copies.
5. Make sure that the wires are correctly between the cleaner pads and that there is no foreign material (iron filings, etc.) on the casing.
6. When installing new corona wires, do not bend or scratch the wire surface. Doing so may cause uneven charge. Also be sure that the corona wires are correctly positioned in the end blocks. (See Charge Corona Wire Replacement)
7. Clean the grid plate with a blower brush (not with a dry cloth).
8. Do not touch the charge grid plate with bare hands. Also, do not bend the charge grid plate or make any dent in it. Doing so may cause uneven charge.
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4.1.7 DEVELOPMENT

1. Be careful not to nick or scratch the development roller.
2. Place the development unit on a sheet of paper after removing it from the copier.
3. Never disassemble the development roller assembly. The position of the doctor plate is set with special tools and instruments at the factory to ensure the proper gap between the doctor blade and the development roller.
4. Clean the drive gears after removing used developer.
5. Dispose of used developer in accordance with local regulations.
6. Never load types of developer and toner into the development unit other than specified for this model. Doing so will cause poor copy quality and toner scattering.
7. Immediately after installing new developer, the TD sensor initial setting procedure should be performed to avoid damage to the copier. Do not perform the TD sensor initial setting with used developer. Do not make any copies before doing the TD sensor initial setting.
8. When u sing a vacuum cleaner to clean the development unit casing, al ways ground the casing with your fingers to avoid damaging the toner density sensor with static electricity.
9. When replacing the TD sensor, the developer should be replaced and then the TD sensor initial setting procedure (SP2-801) should be done, followed by process control initialization (SP2-962).
4-3
GENERAL CAUTIONS 18 July, 2001

4.1.8 CLEANING

1. When servicing the cleaning section, be careful not to damage the edge of the cleaning blade.
2. Do not touch the cleaning blade with bare hands.
3. Before disassembling the cleaning section, place a sheet of paper under it to catch any toner falling from it.

4.1.9 FUSING UNIT

1. After installing the fusing thermistor, make sure that it is in contact with the hot roller and that it is movable.
2. Be careful not to damage the edges of the hot roller strippers or their tension springs.
3. Do not touch the fusing lamp and rollers with bare hands.
4. Make sure that the fusing lamp is positioned correctly and that it does not touch the inner surface of the hot roller.

4.1.10 PAPER FEED

1. Do not touch the surface of the pick-up, feed, and separation rollers.
2. To avoid paper misfeeds, the side fences and end fence of the paper tray must be positioned correctly to align with the actual paper size.

4.1.11 USED TONER

1. We recommend checking the amount of used toner at every EM.
2. Dispose of used toner in accordance with local regulations. Never throw toner into an open flame, for toner dust may ignite.
4-4
18 July, 2001 SERVICE PROGRAM MODE

4.2 SERVICE PROGRAM MODE

4.2.1 SERVICE PROGRAM MODE OPERATION

The service program (SP) mode is used to check electrical data, change modes, and adjust values.
Service Program Access Procedure
Entering SP mode
1) Press the following keys in sequence.
!
Hold the " key for more than 3 seconds.
2) A menu of SP modes is displayed on the LCD.
!
"
#
"
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Service
A294M001.PCX
NOTE: The installed applications appear as Copy SP and Printer SP. If the
printer application is not installed, its name does not appear.
4-5
SERVICE PROGRAM MODE 18 July, 2001
3) Touch the application which you need. Then, the application’s SP mode
display will appear, as shown.
A294M002.PCX
Exiting SP mode
1) Touch the “Exit” keys to return to the standby mode display.
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18 July, 2001 SERVICE PROGRAM MODE
Accessing Copy Mode from within an SP Mode
1) Touch the “Copy Mode” key.
A294M003.PCX
2) Select the appropriate copy mode and make trial copies.
3) To return to the SP mode, touch the “SP mode” key.
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Service
4-7
A294M004.PCX
SERVICE PROGRAM MODE 18 July, 2001
Selecting the Program Number
Program numbers are composed of two or three levels. There are two ways to select the program number.
Ten-key Pad
Input the required program number.
Touch Panel
1) Touch the 1st level program.
2) Touch the 2nd level program.
NOTE: A “*” mark indicates that there are 3rd level programs.
3) Touch the 3rd level program.
A294M002.PCX
A294M003.PCX
4-8
18 July, 2001 SERVICE PROGRAM MODE
A294M005.PCX
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Service
4-9
SERVICE PROGRAM MODE 18 July, 2001
Inputting a Value or Setting for an SP Mode
1. Select the required program mode as explained on the previous page.
2. Enter the required setting using the ten-key pad, then touch the “Start” key or OK key or $ key.
NOTE: 1) If you forget to touch the “Start” key or OK key, the previous value
remains.
2) Change between “+” and “–” using the “” key before entering the required value.
3. Exit SP mode.
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18 July, 2001 SERVICE PROGRAM MODE

4.2.2 SERVICE PROGRAM MODE TABLES

NOTE: 1) In the Function column, comments are in italics.
2) In the Settings column, the default value is in bold letters.
3) S and B in the right hand side of the mode number column means that this mode is stored in the NVRAM on the SICU (S) or BCU (B). If you do a RAM reset, all these SP modes will be reset to their factory settings.
4) [A294 I], [A295 I], [A294 II] and [A295 II] in the Settings column mean the following product types: [A294 I]: Existing 85 cpm model. [A295 I]: Existing 105 cpm model. [A294 II]: Enhanced 85 cpm model. [A295 II]: Enhanced 105 cpm model.
1-001
1-002
Mode No.
(Class 1, 2 and 3)
Leading Edge Registration
Paper Tray
1
(Copier and LCT)
2 Duplex Tray
Side-to-Side Registration
1Tray-1
2Tray-2
Function Settings
Adjusts the printing leading edge registration for feeding from the trays using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. The specification is 3 See "Replacement and Adjust m ent – Copy Image Adjustments" for details.
Adjusts the printing leading edge registration for the duplex feeding using the trimming area pattern (SP2-902-3, No.15).
Use the “ before entering the value.
B
The specification is 3 See "Replacement and Adjust m ent – Copy Image Adjustments" for details.
Adjusts the printing side-to-side registration from the 1st paper feed station using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. See “Replacement and Adjustment – Copy Image Adjustments” for details on SP1-002.
Adjusts the printing side-to-side registration from the 2nd paper feed station using the trimming area pattern (SP2-902-3, No.15).
Use the “ before entering the value.
B
The specification is 0
” key to toggle between + and –
±
2 mm.
” key to toggle between + and –
±
2 mm.
” key to toggle between + and –
” key to toggle between + and –
±
2.0 mm.
+9 ~ –9
0.1 mm/step
+3.0 mm
+9 ~ –9
0.1 mm/step
–1.5 mm
+9 ~ –9
0.1 mm/step
–1.5 mm
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SERVICE PROGRAM MODE 18 July, 2001
1-002
1-003
Mode No.
(Class 1, 2 and 3)
Side-to-Side Registration
3Tray-3
4 Tray-4 (LCT)
5 Tray-5 (LCT)
6 Tray-6 (LCT)
7 Duplex Tray
Paper Buckle Adjustment (Registration)
1 Copier Paper
Tray
2LCT Tray 3 Duplex Tray B
Duplex Fence Adjustment1-008
Fusing Idling After Low Power Mode1-103
Adjusts the printing side-to-side registration from the 3rd paper feed station using the trimming area pattern (SP2-902-3, No.15).
Use the “
B
before entering the value. The specification is 0
Adjusts the printing side-to-side registration from the 4th paper feed station using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. The specification is 0
Adjusts the printing side-to-side registration from the 5th paper station using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. The specification is 0
Adjusts the printing side-to-side registration from the 6th paper station using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. The specification is 0
Adjusts the printing side-to-side registration from the duplex tray using the trimming area pattern (SP2-902-3, No.15).
B
Use the “ before entering the value. The specification is 0
Adjusts the relay clutch timing at
B
registration. The relay clutch timing determines the amount of paper buckle at
B
registration. (A +ve setting leads to more buckling.)
Adjusts the distance between the front and
B
rear fences.
Selects whether fusing idling is done or not when recovering from the low power mode.
Function Settings
” key to toggle between + and –
±
2.0 mm.
” key to toggle between + and –
±
2.0 mm.
” key to toggle between + and –
±
2.0 mm.
” key to toggle between + and –
±
2.0 mm.
” key to toggle between + and –
±
2.0 mm.
+9 ~ –9
0.1 mm/step
–1.5 mm
+9 ~ –9
0.1 mm/step
–2.5 mm
+9 ~ –9
0.1 mm/step
–2.5 mm
+9 ~ –9
0.1 mm/step
–2.5 mm
+9 ~ –9
0.1 mm/step
–3.0 mm
+9 ~ –9 1 mm/step
+4.0 mm
+4 ~ –4
0.5 mm/step
0.0 mm
0: Not done
1: Done
B
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18 July, 2001 SERVICE PROGRAM MODE
1-105
Mode No.
(Class 1, 2 and 3)
Fusing Temperature Adjustment
Fusing
1
Temperature in Waiting Condition
2Fusing
Temperature Lower Limit
3Fusing
Temperature Correction (<A4/LT)
4Fusing
Temperature Correction (A4/LT)
Fusing Temperature Display1-106
Fusing Nip Band Check1-109
Web Motor Control1-902
1Web
Consumption
Adjusts the fusing temperature for stand­by.
B
Adjusts the fusing temperature lower limit. When the fusing unit falls below this temperature, the machine stops copying. Copying automatically restarts when the
B
fusing temperature recovers.
This SP mode is for designer’s use only.
Specifies the amount to raise the fusing temperature from standby mode to print on A4/LT or smaller width paper.
B
Specifies the amount to raise the fusing temperature from standby mode to print on paper of A4/LT width.
B
Displays the fusing temperature.
Feeds a sheet from a paper tray and stops the sheet when it is between the hot roller and the pressure roller. Use an OHP sheet. After keeping the sheet there for 30 seconds, the sheet is automatically fed out. For details, see Replacement and Adjustment – Fusing.
Displays the percentage of the web consumption in 1% steps (0% ~ 107%). The value can be manually input using
B
number keys.
Function Settings
[A294 I & II] 168 ~ 178 1°C/step
173°°°°C
[A295 I & II] 173 ~ 178 1°C/step
178°°°°C
[A294 I & II] 157 ~ 163 1°C/step
163°°°°C
[A295 I & II] 157 ~ 167 1°C/step
167°°°°C
+0 ~ +20 1°C/step [A294 I & II]
+15°°°°C
[A295 I & II]
+20°°°°C
–5 ~ +20 1°C/step [A294 I]
+10°°°°C
[A295 I]
+15°°°°C
[A294 II]
+5°°°°C (US) +10°°°°C (EU)
[A295 II]
+5°°°°C (US) +15°°°°C (EU)
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SERVICE PROGRAM MODE 18 July, 2001
1-902
2-001
Mode No.
(Class 1, 2 and 3)
Web Motor Control
Web Motor
2
Drive Interval
Web Motor
3
Drive Time
Web Near End
4
Setting
Duplex Stop Position – Right1-906
Charge Corona Bias Adjustm ent
1 Image Area
(Auto Process Control OFF)
2 ID Sensor
Pattern (Auto Process Control OFF)
Change the interval of copy operation time after which the web motor is driven
B
Changes the time that the web motor is driven.
B
Changes the web consumption ratio at which web near end is displayed.
About 40k A4 copies can be made after the
B
web consumption reaches 100%.
Changes the paper stop position in the duplex unit after passing duplex transport
B
sensor 2.
For designer use only.
Adjusts the voltage applied to the grid plate during copying when auto process control is off.
Normally, there is no need to adjust this.
B
If there is an ID or TD sensor problem, the machine goes into fixed toner supply mode. After replacing the drum or charge corona wire, change this value to the default.
Adjusts the voltage applied to the grid plate when making the ID sensor pattern, when auto process control is switched off.
Normally, there is no need to adjust this. If the user wants high density copies, the
B
sensor pattern must be lighter, so this voltage must be a higher negative voltage.
Function Settings
[A294/A295 I] 15 ~ 130 1 s/step
[A294 I] 42 s [A295 I] 34 s
[A294/A295 II] 3 ~ 130 1 s/step [A294 II]
11 s (EU) 21 s (US)
[A295 II]
9 s (EU) 17 s (US)
[A294/A295 I]
0.1 ~ 3.0
0.1 s/step
0.8 s
[A294/A295 II]
0.3 ~ 3.5
0.1 s/step
2.8 s
0 ~ 105 1%/step [A294/A295 I]
100%
[A294/A295 II]
86% (EU) 90% (US)
–10 ~ 10 2 mm/step
–8 mm
–600 ~ –1,300 10 V/step
–1,000 V
–600 ~ –1,300 10 V/step
–800 V
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18 July, 2001 SERVICE PROGRAM MODE
2-001
2-101
Mode No.
(Class 1, 2 and 3)
Charge Corona Bias Adjustm ent
Image Area
3
(Auto Process Control ON)
Adjusts the voltage applied to the grid plate during copying when auto process control is switched on.
B
This voltage changes every time auto process control starts up (every time the machine is switched on)
4 Grid Voltage for
Transparent Sheet
Adjusts the voltage applied to the grid plate when translucent mode is selected. Use this if there is a copy quality problem
B
when making copies on translucent paper. Normally there is no need to adjust this. See 2-001-1.
5 Total Corona
Current
Total Corona
6
Current (Photo mode)
D
7V
(Auto Process Control)
Adjusts the current applied to the charge corona wire except for Photo mode.
B
Adjusts the current applied to the charge corona wire for Photo mode.
B
Adjusts the target V Control Initial Setting.
B
Printing Erase Margin
Adjusts the leading edge erase margin.1 Leading Edge
See “Replacement and Adjustment – Copy
S
Image Adjustments” for more on SP2-101.
Function Settings
–600 ~ –1,300 10 V/step [A294/A295 I]
–1,000 V
[A294/A295 II]
–950 V
–600 ~ –1,300 10 V/step [A294/A295 I]
–1,070 V
[A294/A295 II]
–950 V
–1,400 ~ –2,800 100µA/step
–1,400 µµµµA
1,400 ~ –2,800 100µA/step
–1,600 µµµµA
D
voltage for Process
–800 ~ –1,000 10 V/step [A294/A295 I]
–970 V
[A294/A295 II]
–850 V
0.0 ~ 9.0
0.1 mm/step
2.5 mm
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Service
2-103
4Right
LD Power Adjustment
2 LD2 - 600dpi
Adjusts the trailing edge erase margin.2 Trailing Edge
S
Adjusts the left side erase margin.3 Left
S
Adjusts the right side erase margin.
S
Adjusts the power of LD1.1 LD1 - 600dpi
Do not change the value.
B
Adjusts the power of LD2.
Do not change the value.
B
4-15
0.0 ~ 9.0
0.1 mm/step
2.5 mm
0.0 ~ 9.0
0.1 mm/step
2.0 mm
0.0 ~ 9.0
0.1 mm/step
2.0 mm
–127 ~ +127 1/step 1 = 1.1 µW
+0
–127 ~ +127 1/step 1 = 1.1 µW
+0
SERVICE PROGRAM MODE 18 July, 2001
2-103
2-114
2-201
Mode No.
(Class 1, 2 and 3)
LD Power Adjustment
Adjusts the power of LD3.3 LD3 - 600dpi
Do not change the value.
B
Adjusts the power of LD4.4 LD4 - 600dpi
Do not change the value.
B
LD1 Power
5
Adjustment (Start/End)
LD2 Power
6
Adjustment (Start/End)
LD3 Power
7
Adjustment (Start/End)
LD4 Power
8
Adjustment (Start/End)
LD Power Adjustment (for ID pattern)2-104
Printer Dot Edge Parameter Setti ng
1 Leading Dot
Level Setting (Left Edge)
2 Trailing Dot
Level Setting (Right Edge)
3 Multiple Dot
Level Setting S
4 Independent
Dot Level Setting
Development Bias Adjustment
2 ID Sensor
Pattern
Factory use only. Do not use this SP
B
mode.
Factory use only. Do not use this SP
B
mode.
Factory use only. Do not use this SP
B
mode.
Factory use only. Do not use this SP
B
mode.
Selects the LD power for making the ID pattern when auto process control is
B
switched on. Do not use unless advised.
Changes the LD power level for the left
S
edge pixel in printer mode, if FCI is off. Changes the LD power level for the left
S
edge pixel in printer mode, if FCI is off. Changes the LD power level for continuous
pixels in printer mode, if FCI is off. Changes the LD power level for
S
independent dots in printer mode, if FCI is off.
Adjusts the development bias for copying.1 Image Area
This can be adjusted as a temporary measure if faint copies appear due to an
B
aging drum.
Adjusts the development bias for making the ID sensor pattern for V when the auto process control is set to off.
This should not be used in the field,
B
because it affects ID sensor pattern density, which affects toner supply.
Function Settings
–127 ~ +127 1/step 1 = 1.1 µW
+0
–127 ~ +127 1/step 1 = 1.1 µW
+0
Start Stop
Start Stop
Start Stop
Start Stop
0 ~ 7 1/step
4
20 ~ 100% 1% step
50%
20 ~ 100% 1% step
50%
20 ~ 100% 1% step
100%
20 ~ 100% 1% step
50%
–200 ~ –700 10 V/step [A294/A295 I]
–530 V
[A294/A295 II]
–650 V
–200 ~ –700
SP
measurement
10 V/step
–400 V
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18 July, 2001 SERVICE PROGRAM MODE
2-201
2-207
2-208
2-209
2-210
Mode No.
(Class 1, 2 and 3)
Development Bias Adjustment
Transparent
3
Sheet
B
4 ID Sensor
Development Potential
B
Forced Toner Supply
1 Forced Toner
Supply
2 Toner Bank
Toner Setup
Toner Supply Mode
B
Toner Supply Rate
B
ID Sensor Pattern Interval
Function Settings
Adjusts the development bias for copying onto translucent sheets.
Adjusts the development potential for making the ID sensor pattern for V
SP
measurement when the auto process control is set on.
Forces toner supply for 7 seconds from the toner bank through the toner hopper to the development unit.
This mode finishes automatically after the toner is supplied 7 times (1 s for each time).
Turns on the main motor, development motor, development bias, toner supply motor and charge corona. Then turns on the toner supply coil clutch to supply toner to the toner hopper, but not to the development unit. It takes about 7 minutes.
This mode should be used to fill the toner transport path with toner after cleaning the toner supply unit, or at installation.
Selects the toner supply mode.
Use image pixel count mode only as a temporary countermeasure if the ID or TD sensor is defective.
Adjusts the toner supply rate from the hopper.
Increasing this value reduces the toner supply roller clutch on time. Use a lower value if the user tends to make lots of copies that have a high proportion of black.
Changes the interval for making the ID sensor pattern (V
SP/VSG
detection).
If the user normally makes copies with a high proportion of black, reduce the interval.
–200 ~ –700 10 V/step [A294/A295 I]
–530 V
[A294/A295 II]
–650 V
180 ~ 380 1 V/step
280 V
Start
Start
Sensor Control
Pixel Count Control
100 ~ 2,000 10 mg/s/step [A294 I & II]
800 mg/s
[A295 I & II]
1000 mg/s
0 ~ 500 1 copy/step
10 copies
Tables
Service
B
4-17
SERVICE PROGRAM MODE 18 July, 2001
2-220
2-301
Mode No.
(Class 1, 2 and 3)
REF
V
Manual Setting
B
VT Display2-223
B
Toner Bank Toner Discharge2-226
Toner Supply Mode Display2-227
Transfer Current Adjustment
11st Copy Side
B
Function Settings
Adjusts the TD sensor reference voltage
REF
(V
).
Change this value after replacing the development unit with another one that already contains toner. For example, when using a development unit from another machine for test purposes, do the following:
1. Check the value of SP2-220 in both the machine containing the test unit and the machine that you are going to move it to.
2. Install the test development unit, then input the V
for this unit into SP2-220.
REF
3. After the test, put back the old development unit, and change SP2-220 back to the original value.
Displays the current TD sensor output voltage.
This SP removes toner from the toner bank to the toner hopper. After turning the toner supply motor and the toner bank motor on, the toner supply coil clutch turns on and off at 2 second intervals. The motors and clutch stop when the toner near-end sensor (in the toner bank unit) detects no toner. Even if the sensor continues to detect toner, this operation stops when the clutch has been turned on and off 10 times, so this SP may have to be repeated to clean out the system completely.
Displays the toner supply mode used for the last copy. 1: ID Sensor and TD Sensor (from the 11th
copy, using V
T
– V
REF
)
2: ID Sensor and TD Sensor (using
SP/VSG
V
) – before the 10th copy of a job
3: TD Sensor – temporary mode when ID
sensor output is abnormal
4: Image Pixel Count
Adjusts the current applied to the transfer belt during copying on the 1st side of the paper.
If the user uses thicker paper, the current may have to be increased to ensure sufficient transfer of toner.
0 ~ 5.0
0.01 V/step
2.5 V
Start
10 ~ 200 1 µA/step [A294 I & II]
120 µµµµA
[A295 I & II]
140 µµµµA
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18 July, 2001 SERVICE PROGRAM MODE
2-301
2-506
2-801
Mode No.
(Class 1, 2 and 3)
Transfer Current Adjustment
2 Thick Paper
3 OHP Sheet
4 Transparent
Paper
5 2nd Copy
6 Between Pages
Cleaning Interval – Multiple Copy
1On/Off
2 Interval
TD Sensor Initial Setting
Adjusts the current applied to the transfer belt during copying on thick paper.
See above.
B
Adjusts the current applied to the transfer belt during copying on OHP sheet.
B
See above. If the user normally feeds thicker paper from the bypass tray, use a higher setting.
Adjusts the current applied to the transfer belt during copying on translucent paper.
B
Adjusts the current applied to the transfer belt during copying on the 2nd side of the paper.
B
Adjusts the current applied to the transfer belt between the pages.
B
Selects whether multiple copy jobs are stopped at regular intervals for the following purposes.
1. Stop and turn the drum motor in reverse
2. Make an ID sensor pattern to correct the
B
The interval depends on SP2-506-2. Use if the drum gets dirty or images get too pale or too dark during a long job. Normally keep at ‘No’, because the ‘Yes’ setting causes the machine to stop copying every 15 minutes, which may cause problems for the customer.
Selects the interval at which multi copy jobs are stopped.
B
Performs the TD sensor initial setting. This SP mode controls the voltage applied to the TD sensor to make the TD sensor output about 2.5 V. After finishing this, the TD
B
sensor output voltage is disp layed.
Use this mode only after changing the TD sensor or the developer.
Function Settings
to clean the cleaning blade edge toner density control.
10 ~ 200 1 µA/step [A294 I & II]
120 µµµµA
[A295 I & II]
140 µµµµA
10 ~ 200 1 µA/step
140 µµµµA
10 ~ 200 1 µA/step [A294 I & II]
120 µµµµA
[A295 I & II]
140 µµµµA
10 ~ 200 1 µA/step [A294 I & II]
120 µµµµA
[A295 I & II]
140 µµµµA
10 ~ 200 1 µA/step
20 µµµµA
1: No
2: Yes
1 ~ 100 1 minute/step
30 minutes
Start
Tables
Service
4-19
SERVICE PROGRAM MODE 18 July, 2001
2-803
2-804
2-813
2-902
2-909
Mode No.
(Class 1, 2 and 3)
Corona Wire Cleaner On
Turns on the corona wire cleaner manually.
When copy density across the paper is uneven at EM, clean the wire with this mode.
Charge Corona Cleaner Setting
1 Corona Wire
Cleaner Operation Setting
2 Operation
Interval B
Printer Gamma Setting
Printing Test Pattern
2IPU Test
Pattern Selection (for Scanner)
3 Printing Test
Pattern
4 Outer I/F Block
Test Pattern
Frequency
5
Pattern Density
Vcont Manual Setting2-906
Main Scan Magnification
1 Copier
Selects when automatic corona wire cleaning is done. 0: Corona wire cleaning is not done. 1: When process control initial setting is
B
2: At the period set in SP2-804-2. Selects the interval for automatic corona
wire cleaning.
Select if printer gamma correction is applied or not.
S
This SP mode is for designer use only.
Prints the test patterns for the IPU chip. See section 4.2.3. for how to print test patterns.
This SP mode is useful for finding whether the SICU or the SBU is defective. If the printout is not OK, the SICU is defective.
Prints the printer test patterns. See section 4.2.3. for how to print test patterns. Example: 15. Trimming Area
This SP mode is useful for finding whether the LDDR or the SICU is defective. If the printout is not OK, the LDDR is defective.
Prints the test patterns for the IPU chip. See section 4.2.3. for how to print test patterns.
This SP mode is useful for finding whether the SICU or the printer application is defective. If the printout is not OK, the SICU is defective.
Designer use only.
B Factory use only.
Adjusts the magnification in the main scan direction for copy mode.
Use the “
S
See “Replacement and Adjustment – Copy Image Adjustments” for details.
Function Settings
done, if the copy number after the last cleaning operation is over the number set in SP2-804-2.
” key to toggle between + and –.
Start
[A294/A295 I] 0: Not done
1: Done
2:Periodically [A294/A295 II] 0: Not done 1: Done
2:Periodically
100 ~ 10,000 100 print/step
5,000
0: Applied
1: Not applied
9.7 V
–2.0 ~ +2.0
0.1%/step
+0.0%
4-20
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