Ricoh Ft7950 Service Manual
Penguin Series
Little/Crest/Emperor
(Machine Code: A246/A247/ A248)
Service Manual
TABLE OF CONTENTS
IMPORTANT SAFETY NOTICES
1. OVERALL MACHINE INFORMATION 1-1..........................
1.1 SPECIFICATION 1-1......................................................
1.2 MACHINE CONFIGURATION 1-6..................................
1.2.1 COPIER OVERVIEW 1-6.....................................................
1.2.2 SYSTEM OVERVIEW 1-6....................................................
1.3 COPY PROCESS AROUND THE DURM 1-8................
1.4 MECHANICAL COMPONENT LAYOUT 1-10..................
1.5 DRIVE LAYOUT 1-12.......................................................
1.6 PAPER PATH 1-13...........................................................
1.6.1 STANDARD COPYING 1-13.................................................
1.6.2 MULTIPLE 2-SIDE COPYING 1-14.......................................
1.7 ELECTRICAL COMPONENT DESCRIPTION 1-15.........
2. DETAILED SECTION DESCRIPTIONS 2-1........................
2.1 PROCESS CONTROL 2-1..............................................
2.1.1 OVERVIEW 2-1...................................................................
2.1.2 PROCESS CONTROL DATA INITIAL SETTING 2-4..........
2.1.3 LATENT IMAGE CONTROL 2-5..........................................
2.1.4 IMAGE DENSITY CONTROL 2-12........................................
2.2 DRUM UNIT 2-18..............................................................
2.2.1 OVERVIEW 2-18...................................................................
2.2.2 OPC DRUM CHARACTERISTICS 2-19................................
2.2.3 DRUM CHARGE 2-20............................................................
2.2.4 ERASE 2-23...........................................................................
2.2.5 CLEANING 2-25....................................................................
2.2.6 QUENCHING 2-30.................................................................
2.3 DRUM CLEANING AND TONER-RECYCLING 2-31.......
2.3.1 TONER TRANSPORT 2-31...................................................
2.3.2 FILTERING 2-32....................................................................
2.3.3 PUMP MECHANISM 2-33.....................................................
2.3.4 DRIVE MECHANISM 2-34.....................................................
2.3.5 TONER COLLECTION BOTTLE 2-35...................................
2.4 OPTICS 2-36....................................................................
2.4.1 OVERVIEW 2-36...................................................................
2.4.2 SCANNER DRIVE 2-37.........................................................
2.4.3 VERTICAL LENS DRIVE 2-38...............................................
2.4.4 HORIZONTAL LENS DRIVE 2-39.........................................
2.4.5 HORIZONTAL LENS POSITIONING 2-40.............................
2.4.6 3 SCANNER DRIVE 2-42......................................................
2.4.7 OPTICS CONTROL CIRCUIT 2-43.......................................
2.4.8 AUTOMATIC IMAGE DENSITY CONTROL 2-44..................
2.4.9 MANUAL IMAGE DENSITY CONTROL 2-46........................
2.4.10 UNEVEN LIGHT INTENSITY CORRECTION 2-47.............
2.4.11 ORIGINAL SIZE DETECTION IN PLATEN MODE 2-48......
2.4.12 HALF TONE MODE 2-50.....................................................
2.5 DEVELOPMENT 2-51.......................................................
2.5.1 OVERVIEW 2-51...................................................................
2.5.2 DEVELOPMENT MECHANISM 2-52.....................................
2.5.3 DRIVE MECHANISM 2-53.....................................................
2.5.4 CROSSMIXING 2-54.............................................................
2.5.5 DEVELOPMENT BIAS 2-55..................................................
2.5.6 TONER SUPPLY 2-60...........................................................
2.6 IMAGE TRANSFER 2-64..................................................
2.6.1 PRE-TRANSFER LAMP 2-64................................................
2.6.2 IMAGE TRANSFER AND PAPER SEPARATION 2-65.........
2.6.3 IMAGE TRANSFER AND PAPER SEPARATION 2-66.........
2.6.4 TRANSFER BELT UNIT LIFT MECHANISM 2-68.................
2.6.5 PAPER TRANSPORTATION AND BELT DRIVE 2-69..........
2.6.6 TRANSFER BELT CLEANING MECHANISM 2-70...............
2.6.7 TONER COLLECTION MECHANISM 2-71...........................
2.6.8 TRANSFER ANTI-CONDENSATION HEATER 2-72.............
2.7 PAPER FEED 2-73...........................................................
2.7.1 OVERVIEW 2-73...................................................................
2.7.2 FRR FEED SYSTEM 2-74.....................................................
2.7.3 SLIP CLUTCH MECHANISM 2-76........................................
2.7.4 FRR FEED DRIVE MECHANISM 2-77..................................
2.7.5 SEPARATION ROLLER RELEASE MECHANISM 2-79........
2.7.6 PAPER RETURN MECHANISM 2-80....................................
2.7.7 PAPER SKEW PREVENTION MECHANISM 2-81................
2.7.8 PAPER LIFT MECHANISM 2-82...........................................
2.7.9 PAPER NEAR END/PAPER END DETECTION 2-85............
2.7.10 TANDEM FEED TRAY 2-86................................................
2.7.11 PAPER SIZE DETECTION 2-90..........................................
2.7.12 VERTICAL TRANSPORT MECHANISM 2-91.....................
2.7.13 TRAY POSITIONING MECHANISM 2-92............................
2.7.14 BY-PASS FEED TABLE 2-95..............................................
2.7.15 PAPER REGISTRATION 2-98.............................................
2.7.16 REGISTRATION DRIVE MECHANISM 2-99.......................
2.7.17 GUIDE PLATE RELEASE MECHANISM 2-100....................
2.8 IMAGE FUSING 2-101........................................................
2.8.1 OVERVIEW 2-101...................................................................
2.8.2 FUSING ENTRANCE GUIDE 2-102........................................
2.8.3 FUSING DRIVE MECHANISM 2-103......................................
2.8.4 FUSING LAMP CONTROL 2-104............................................
2.8.5 INVERTER AND PAPER EXIT 2-105......................................
2.8.6 INVERTER AND EXIT DRIVE MECHANISM 2-106................
2.9 DUPLEX 2-107...................................................................
2.9.1 OVERVIEW 2-107...................................................................
2.9.2 DRIVE MECHANISM 2-108.....................................................
2.9.3 DUPLEX ENTRANCE TO DUPLEX TRAY 2-109....................
2.9.4 DUPLEX STACKING 2-110.....................................................
2.9.5 DUPLEX PICK-UP ROLLER MECHANISM 2-111..................
2.9.6 DUPLEX PAPER FEED 2-112.................................................
2.10 ENERGY STAR COMPLIANT MACHINES (ALL 2-115....
2.11 ENERGY SAVING INFORMATION 2-117........................
2.11.1 ABOUT THE ENERGY SAVING FEATURES OF 2-117.......
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 (A246/A247/A248) 3-3.....................................
3.2.1 ACCESSORY CHECK 3-3...................................................
3.2.2 INSTALLATION PROCEDURE 3-4.....................................
3.2.3 GUIDANCE ROM INSTALLATION (OPTION: 3-14...............
3.2.4 PLATEN COVER (OPTION) INSTALLATION 3-15...............
3.2.5 KEY COUNTER HOLDER INSTALLATION 3-16..................
3.2.6 ORIGINAL TRAY INSTALLATION (OPTION) 3-18...............
3.3 UNIVERSAL TRAY (TRAY 2) 3-19..................................
3.4 550 SHEETS PAPER TRAY (TRAY 3) 3-20....................
3.5 TANDEM FEED TRAY PAPER SIZE CHANGE 3-22......
3.6 DUAL JOB FEEDER (A610) 3-25....................................
3.6.1 ACCESSORY CHECK 3-25...................................................
3.6.2 INSTALLATION PROCEDURE 3-26.....................................
3.7 SORTER STAPLER (A821) 3-29.....................................
3.7.1 ACCESSORY CHECK 3-29...................................................
3.7.2 INSTALLATION PROCEDURE 3-30.....................................
3.7.3 SORTER ADAPTER INSTALLATION (OPTION) 3-34..........
3.8 20 BIN SORTER STAPLER (A658) (A246 ONLY) 3-36..
3.8.1 ACCESSORY CHECK 3-36...................................................
3.8.2 INSTALLATION PROCEDURE 3-37.....................................
3.9 LCT (A822) 3-41...............................................................
3.9.1 ACCESSORY CHECK 3-41...................................................
3.9.2 INSTALLATION PROCEDURE 3-42.....................................
3.9.3 PAPER SIZE CHANGE 3-46.................................................
3.10 TRANSPORTATION REMARKS 3-49............................
3.10.1 TONER RECYCLING TUBE CLEANING 3-49....................
3.10.2 OTHER OPERATIONS 3-49................................................
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 CHARGE CORONA 4-2......................................................
4.1.4 OPTICS 4-2.........................................................................
4.1.5 ERASE LAMP 4-3................................................................
4.1.6 DEVELOPMENT UNIT 4-3..................................................
4.1.7 TRANSFER BELT UNIT 4-3................................................
4.1.8 CLEANING SECTION 4-4...................................................
4.1.9 PRE-TRANSFER LAMP 4-4................................................
4.1.10 PAPER FEED 4-4..............................................................
4.1.11 FUSING UNIT 4-4..............................................................
4.1.12 USED TONER 4-5.............................................................
4.2 SERVICE PROGRAM MODE 4-6..................................
4.2.1 SERVICE PROGRAM MODE OPERATION 4-6.................
4.2.2 SERVICE PROGRAM MODE TABLES 4-8.........................
4.2.3 INPUT CHECK 4-45..............................................................
4.2.4 OUTPUT CHECK 4-48..........................................................
4.3 USER PROGRAM 4-51....................................................
4.3.1 HOW TO ENTER AND EXIT UP MODE 4-51.......................
4.3.2 UP MODE TABLE 4-51..........................................................
4.4 TEST POINTS/DIP SWITCHES/LEDS 4-53....................
4.4.1 DIP SWITCHES 4-53.............................................................
4.4.2 TEST POINTS 4-53...............................................................
4.4.3 FUSES 4-54...........................................................................
4.4.4 LEDS 4-54.............................................................................
4.5 SPECIAL TOOLS AND LUBRICANTS 4-54.....................
4.5.1 SPECIAL TOOLS 4-54..........................................................
4.5.2 LUBRICANTS 4-54................................................................
4.6 TOUCH PANEL DISPLAY POSITION 4-55.....................
5. PREVENTIVE MAINTENANCE SCHEDULE 5-1................
5.1 PM TABLE 5-1................................................................
5.2 PM PROCEDURE 5-5....................................................
5.2.1 CLEARING PM COUNTER 5-5...........................................
5.2.2 PM PROCEDURE 5-6.........................................................
6. REPLACEMENT AND ADJUSTMENT 6-1.........................
6.1 EXTERIOR AND INNER COVER REMOVAL 6-1.........
6.1.1 FRONT COVER 6-1.............................................................
6.1.2 REAR SIDE 6-2...................................................................
6.1.3 INNER COVER 6-3..............................................................
6.1.4 RIGHT SIDE 6-6..................................................................
6.1.5 LEFT SIDE 6-7.....................................................................
6.1.6 OPERATION PANEL 6-8.....................................................
6.1.7 UPPER COVER 6-9.............................................................
6.2 PAPER FEED 6-10...........................................................
6.2.1 PAPER TRAY UNIT REMOVAL 6-10....................................
6.2.2 PAPER TRAY REMOVAL 6-13.............................................
6.2.3 PAPER FEED ROLLERS REPLACEMENT 6-16..................
6.2.4 PAPER FEED TIMING ADJUSTMENT 6-17.........................
6.2.5 PAPER FEED CLUTCH REMOVAL (1ST TRAY 6-20...........
6.2.6 REAR FENCE RETURN SENSOR REPLACEMENT 6-24....
6.2.7 REAR FENCE HP SENSOR REPLACEMENT 6-25..............
6.2.8 BOTTOM PAPER SENSOR REPLACEMENT 6-26..............
6.2.9 BY-PASS FEED TABLE REMOVAL 6-27..............................
6.2.10 BY-PASS FEED ROLLERS REPLACEMENT 6-28.............
6.2.11 BY-PASS PAPER SIZE SENSOR REPLACEMENT 6-29...
6.2.12 BY-PASS FEED CLUTCH AND GUIDE PLATE 6-31..........
6.2.13 REGISTRATION MOTOR REMOVAL 6-33.........................
6.2.14 PAPER DUST CLEANER CLEANING 6-34........................
6.2.15 REGISTRATION SENSOR CLEANING 6-35......................
6.2.16 UNIVERSAL TRAY SIZE SWITCH REPLACEMEN 6-36....
6.2.17 550-SHEET TRAY SET SWITCH REPLACEMENT 6-37....
6.2.18 LIFT MOTOR REMOVAL 6-38............................................
6.2.19 PAPER FEED MOTOR REMOVAL 6-39.............................
6.2.20 COPIER FEED UNIT REMOVAL 6-40................................
6.2.21 BOTTOM PLATE LIFT WIRE REPLACEMENT 6-42..........
6.2.22 550 SHEETS PAPER TRAY (TRAY 3) 6-44........................
6.2.23 TANDEM FEED TRAY PAPER SIZE CHANGE 6-46..........
6.3 OPTICS 6-49....................................................................
6.3.1 EXPOSURE GLASS REMOVAL 6-49...................................
6.3.2 EXPOSURE LAMP REPLACEMENT 6-50............................
6.3.3 OPTICS THERMOSWITCH REPLACEMENT 6-52...............
6.3.4 SCANNER HP SENSOR REPLACEMENT 6-53...................
6.3.5 ADS SENSOR REMOVAL 6-54.............................................
6.3.6 SCANNER DRIVE MOTOR 6-55...........................................
6.3.7 SCANNER DRIVE WIRES REPLACEMENT 6-56.................
6.3.8 THIRD SCANNER REMOVAL 6-72.......................................
6.3.9 THIRD SCANNER DRIVE MOTOR/HP SENSOR 6-73.........
6.3.10 LENS HORIZONTAL DRIVE HP SENSOR 6-75.................
6.3.11 LENS HORIZONTAL DRIVE MOTOR 6-77.........................
6.3.12 APS SENSOR ADJUSTMENT (SENSITIVITY 6-79...........
6.3.13 ARS SENSOR ADJUSTMENT 6-80....................................
6.4 TONER RECYCLING 6-81...............................................
6.4.1 TONER RECYCLING UNIT REMOVAL 6-81........................
6.4.2 TONER RECYCLING CLUTCH REPLACEMENT 6-82.........
6.5 DEVELOPMENT AND TONER SUPPLY 6-83................
6.5.1 DEVELOPMENT UNIT REMOVAL 6-83................................
6.5.2 DEVELOPER REPLACEMENT 6-85.....................................
6.5.3 DEVELOPMENT ROLLERS REPLACEMENT 6-87..............
6.5.4 TONER DENSITY SENSOR REPLACEMENT 6-89..............
6.5.5 TONER BOTTLE DRIVE MOTOR REPLACEMENT 6-90.....
6.5.6 DEVELOPMENT FILTER AND PRESSURE 6-91.................
6.5.7 DEVELOPMENT ROLLER SHAFT CLEANING 6-92............
6.6 DRUM UNIT 6-93..............................................................
6.6.1 DRUM UNIT REMOVAL AND OPC DRUM 6-93...................
6.6.2 QUENCHING LAMP REPLACEMENT 6-94..........................
6.6.3 GRID PLATE/CHARGE WIRE/WIRE CLEANER 6-95.........
6.6.4 ERASE LAMP AND DRUM POTENTIAL SENSOR 6-97......
6.6.5 CLEANING BLADE REPLACEMENT 6-98............................
6.6.6 CLEANING BRUSH REPLACEMENT 6-99...........................
6.6.7 PICK-OFF PAWL REPLACEMENT 6-100...............................
6.6.8 OZONE FILTER REPLACEMENT 6-101.................................
6.6.9 PRE-TRANSFER LAMP REMOVAL 6-102.............................
6.7 TRANSFER BELT UNIT 6-103..........................................
6.7.1 TRANSFER BELT UNIT REMOVAL/INSTALLATION 6-103...
6.7.2 TRANSFER BELT REPLACEMENT 6-105.............................
6.7.3 CLEANING BLADE REPLACEMENT 6-107............................
6.8 FUSING UNIT 6-108...........................................................
6.8.1 FUSING UNIT REMOVAL 6-108.............................................
6.8.2 FUSING THERMISTOR REPLACEMENT 6-109.....................
6.8.3 FUSING THERMOFUSE REPLACEMENT 6-110...................
6.8.4 FUSING LAMP REPLACEMENT 6-111..................................
6.8.5 OIL SUPPLY/CLEANING ROLLER REPLACEMENT 6-113...
6.8.6 OIL SUPPLY CLEANING BRUSH REPLACEMENT 6-114.....
6.8.7 HOT ROLLER REPLACEMENT 6-115....................................
6.8.8 PRESSURE ROLLER AND BEARING 6-117..........................
6.8.9 FUSING STRIPPER PAWL REPLACEMENT 6-119...............
6.8.10 FUSING PRESSURE ADJUSTMENT 6-120.........................
6.8.11 PAPER EXIT UNIT REMOVAL 6-121....................................
6.8.12 EXIT SENSOR AND FUSING EXIT SENSOR 6-123............
6.8.13 DUPLEX PAPER GUIDE SENSOR AND 6-124....................
6.8.14 PRESSURE ROLLER CLEANING ROLLER 6-125...............
6.9 DUPLEX UNIT 6-126..........................................................
6.9.1 FEED ROLLER REPLACEMENT 6-126..................................
6.9.2 SEPARATION BELT REPLACEMENT 6-128..........................
6.9.3 DUPLEX UNIT REMOVAL 6-131............................................
6.9.4 SEPARATION CLUTCH/TRANSPORT CLUTCH 6-132.........
6.9.5 JOGGER MOTOR REPLACEMENT 6-133.............................
6.10 COPY QUALITY ADJUSTMENT 6-138............................
6.10.1 SP ADJUSTMENT MODE 6-138...........................................
6.10.2 SIDE-TO-SIDE REGISTRATION ADJUSTMENT 6-140........
6.10.3 UNEVEN EXPOSURE ADJUSTMENT 6-141........................
6.10.4 IMAGE DENSITY ADJUSTMENT 6-143...............................
6.10.5 SCANNER HEIGHT ADJUSTMENT 6-144...........................
6.10.6 APS SIZE CALIBRATION 6-145............................................
6.10.7 FUSING EXIT COVER MAGNET POSITIONING 6-146.......
7. TROUBLESHOOTING 7-1...................................................
7.1 SERVICE CALL CONDITIONS 7-1...............................
7.1.1 SUMMARY 7-1....................................................................
7.1.2 EXPOSURE 7-3...................................................................
7.1.3 SCANNER 7-5.....................................................................
7.1.4 LENS MAGNIFICATION 7-8................................................
7.1.5 OPTICS THERMISTOR 7-10.................................................
7.1.6 CHARGE CORONA UNIT 7-10.............................................
7.1.7 DEVELOPMENT 7-11............................................................
7.1.8 PROCESS CONTROL SENSORS 7-12................................
7.1.9 TRANSFER CURRENT 7-15.................................................
7.1.10 DRUM 7-15..........................................................................
7.1.11 PAPER FEED 7-16..............................................................
7.1.12 DUPLEX 7-19......................................................................
7.1.13 FUSING 7-20.......................................................................
7.1.14 SYSTEM CONTROL 7-22...................................................
7.1.15 DUAL JOB FEEDER 7-23....................................................
7.1.16 SORTER STAPLER 7-24....................................................
7.1.17 OTHERS 7-28......................................................................
7.2 ELECTRICAL COMPONENT DEFECTS 7-30................
7.2.1 SENSORS 7-30.....................................................................
7.2.2 SWITCHES 7-34....................................................................
7.2.3 FUSES 7-35...........................................................................
POINT TO POINT DIAGRAM & ELCTRICAL
A246/A247/A248/A822 POINT TO POINT DIAGRAM
ELECTRICAL COMPONENT LAYOUT (A246/ A247/ A248
ELECTRICAL COMPONENT LAYOUT (A246/ A247/ A248
SORTER STAPLER (A821)
ELECTRICAL COMPONENT LAYOUT (A821)
IMPORTANT SAFETY NOTICES
PREVENTION OF PHYSICAL INJURY
1. Before disassembling or assembling parts of the copier and peripherals,
make sure that the copier power cord is unplugged.
2. The wall outlet should be near the copier and easily accessible.
3. Note that some components of the copier and the paper tray unit are
supplied with electrical voltage even if the main switch is turned off.
4. If any adjustment or operation check has to be made with exterior covers off
or open while the main switch is turned on, keep hands away from electrified
or mechanically driven components.
5. The inside and the metal parts of the fusing unit become extremely hot while
the copier is operating. Be careful to avoid touching those components with
your bare hands.
6. The copier is not attached to the table. Pushing the copier too heard may
cause it to drop onto the floor. While moving the copier, push the table.
7. When the main switch is tuned on, the machine will suddenly start turning to
perform the developer initialization. Keep hand away from any mechanical
and electrical components during this per iod.
HEALTH SAFETY CONDITIONS
1. Never operate the copier without the ozone filters installed.
2. Always replace the ozone filters with the specified ones at the specified
intervals.
3. Toner and developer are non-toxic, but if you get either of them in your eyes
by accident, it may cause temporary eye discomfort. Try to remove with eye
drops or flush with water as first aid. If unsuccessful, get medical attention.
OBSERVANCE OF ELECTRICAL SAFETY STANDARDS
1. The copier and its peripherals must be installed and maintained by a
customer service representative who has completed the training course on
those models.
CAUTION:
The RAM board on the main control boar d has a li thi u m batt er y
which can explode if replaced incorrectly. Replace the RAM board
only with an identical one. Th e man u fact urer re co m men ds re pl aci ng
the entire RAM board. Do not recharge or burn this battery. Used
RAM board must be handled in accordance with local regulations.
SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL
1. Do not incinerate the toner cartridge or the used toner. Toner dust may ignite
suddenly when exposed to open flame.
2. Dispose of used toner, developer, and organic photoconductor according to
local regulations. (These are non-toxic supplies.)
3. Dispose of replaced parts in accordance with local regulations.
4. When keeping used RAM boards in order to dispose of them later, do not put
more than 100 RAM boards per sealed box. Storing larger numbers or not
sealing them apart may lead to chemical reactions and heat build-up.
21 September 1998 SPECIFICATION
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATION
Configuration: Console
Copy Process: Dry electrostatic transfer system
Toner Supply Control: Fuzzy Control
Photoconductor: OPC drum
Originals: Sheet/Book
Original Size: Maximum A3/11" x 17"
Original Alignment: Left rear corner
Copy Paper Size: Maximum A3/11" x 17" (Tray & By-pass)
A4/8
Minimum A5/5
A4/8
A6/5
Duplex Copying: Maximum A3/11" x 17"
Minimum A5/5
Copy Paper Weight: Paper tray: 52 ~ 128 g/m2, 14 ~ 34 lb
By-pass feed table: 52 ~ 200 g/m2, 14 ~ 53 lb
Duplex copying: 64 ~ 104 g/m2, 17 ~ 24 lb
" x 11" (Tandem LCT)
1/2
" x 8
1/2
" x 11" (Tandem LCT)
1/2
" x 8
1/2
" x 8
1/2
" (Tray)
1/2
" (By-pass)
1/2
" (Sideways)
1/2
Overall
Information
Reproduction Ratios: 4 Enlargement and 5 Reduction + Create Margin
(93%)
A4/A3 Version LT/LDG Version
200%
Enlargement
Full Size 100% 100%
Reduction
141%
122%
115%
82%
75%
71%
65%
50%
200%
155%
129%
121%
85%
77%
74%
65%
50%
1-1
SPECIFICATION 21 September 1998
Power Source: 115 V, 60 Hz, more than 20 A (for N.A)
220 ~ 240 V, 50 Hz/60 Hz, more than 10 A (for
Europe and Asia)
Power Consumption:
- A246 copier -
Copier only Full system*
Warm up 1.20 kVA 1.22 kVA
Stand-by*
Low Power mode*
2
2
0.22 kVA 0.24 kVA
0.185 kVA 0.205 kVA
Copying 1.40 kVA 1.40 kVA
Maximum 1.70 kVA 1.75 kVA
Off-mode 0.001 kVA 0.001 kVA
- A247 copier -
Copier only Full system*
Warm up 1.20 kVA 1.22 kVA
Stand-by*
Low Power mode*
2
2
0.22 kVA 0.24 kVA
0.21 kVA 0.23 kVA
Copying 1.50 kVA 1.50 kVA
Maximum 1.70 kVA 1.75 kVA
Off-mode 0.001 kVA 0.001 kVA
- A248 copier -
Copier only Full system*
Warm up 1.20 kVA 1.22 kVA
Stand-by*
Low Power mode*
Copying 1.60 kVA 1.60 kVA
Maximum 1.70 kVA 1.75 kVA
Off-mode 0.001 kVA 0.001 kVA
2
2
0.22 kVA 0.24 kVA
0.21 kVA 0.23 kVA
1
1
1
*1Full System:
Mainframe with dual job feeder, sorter stapler
and 3,500-sheet large capacity tray
2
*
: When the anti-condensation heaters are off.
1-2
21 September 1998 SPECIFICATION
Noise Emission: Sound Pressure Level:
The measurements are ma de accor di ng to
ISO7779
- A246 copier -
Overall
Information
Sound pressure level
Sound power level
- A247 copier -
Sound pressure level
Sound power level
(The measurements are made according to ISO 7779 at
the operator position.)
Copier only
Stand-by Less than 34 dB (A)
Copying Less than 57 dB (A) (average)
(The measurements are made according to ISO 7779.)
Copier only
Stand-by Less than 48 dB (A)
Copying Less than 71 dB (A) (average)
(The measurements are made according to ISO 7779 at
the operator position.)
Copier only
Stand-by Less than 34 dB (A)
Copying Less than 59 dB (A) (average)
(The measurements are made according to ISO 7779.)
- A248 copier -
Sound pressure level
Sound power level
Copier only
Stand-by Less than 51 dB (A)
Copying Less than 72 dB (A) (average)
(The measurements are made according to ISO 7779 at
the operator position.)
Copier only
Stand-by Less than 36 dB (A)
Copying Less than 59 dB (A) (average)
(The measurements are made according to ISO 7779.)
Copier only
Stand-by Less than 54 dB (A)
Copying Less than 73 dB (A) (average)
1-3
SPECIFICATION 21 September 1998
Dimensions:
Width Depth Height
Copier only
Copier with dual job feeder, sorter stapler,
and 3,500-sheet large capacity tray
Copier with dual job feeder, sorter stapler with
punch, and 3,500-sheet large capacity tray
690 mm
27.2"
1,659 mm
65.4"
1,659 mm
65.4"
698 mm
27.6"
698 mm
27.6"
698 mm
27.6"
980 mm
38.6"
1,113 mm
43.9"
1,113 mm
43.9"
Weight: Copier only: (Without the optional platen cover
= Approximately 2 kg)
Approximately 175 kg
Zoom: From 50% to 200% in 1% steps
Copying Speed:
A246 copier
A247 copier 60 31 38
A248 copier 70 36 44
A4/LT (sideways) A3/DLT B4/LG
51 (A4 others)
50 (A4/in France)
50 (LT)
26 32
Warm-up Time: Less than 5 minutes (A246 copier, 20°C)
Less than 5.5 minutes (A247/A248 copier, 20°C)
First Copy Time:
(A4/5
" x 11" sideways
1/2
3.1 seconds (A246 copier)
2.6 seconds (A247/A248 copiers)
from the 1st feed station)
Copy Number Input: Number keys, 1 to 999 (count up or count down)
Manual Image Density
9 steps
Selection:
Automatic Reset: 1 minute standard setting; can also be set from 1
second to 999 seconds or no auto reset.
Copy Paper Capacity:
By-pass feed table: approximately 50 sheets
Paper tray: approximately 550 sheets
Tandem LCT tray: approximately 1,550 sheets
Toner Replacement: 1,160 g/cartridge
1-4
21 September 1998 SPECIFICATION
Optional Equipment:
Platen cover (A528-04)
Dual job feeder (A610)
20 bin sorter stapler (Floor type) (A821-17:
Ricoh, -22: NRG, -15: Savin/Ges U.S.A. –26:
Infotec)
3,500-sheet Large capacity tray (A822)
Receiving tray (A446-05)
Key Counter Bracket D (A509-03)
20 bin sorter Stapler (Floor type) with punch
(A821-57 (3 holes), -67 (2 holes): Ricoh, -62:
NRG, -66: Infotec, -55: Savin/Ges U.S.A.)
Guidance ROM KIT Type U (A870)
Editing sheet (spare part)
Original Tray type F (A430-07)
Sorter Adapter type L (A902-19)
20 bin sorter stapler (Hunging type) (A658)
(A246 copier only)
When the 20 bi n sorter stapler (A658) is installed onto A246 copier, sorter adapter
type L is required.
Overall
Information
1-5
MACHINE CONFIGURATION 21 September 1998
1.2 MACHINE CONFIGURATION
1.2.1 COPIER OVERVIEW
- A246/A247/A248 copiers -
Tandem LCT
(including two 1,550-sheet LCT
Two 550-sheet paper trays
Optional 3,500-sheet large capacity tray
1,550 x 2
550
550
(3,500)
A246V500.WMF
1.2.2 SYSTEM OVERVIEW
Hunging S/S
S/S with Punch
S/S
DJF
Original Tray
Tandem LCT
Hunging Sorter Stapler
(A658)
Floor type Sorter Stapler (A821-17, -15, -22, -26)
Floor type Sorter Stapler with Punch (A821-57, -67, -55, -62, -66)
1-6
Universal
Fixed
3,500 sheets
LCT
A246V501.WMF
21 September 1998 MACHINE CONFI GURATION
MEMO
Overall
Information
1-7
COPY PROCESS AROUND THE DURM 21 September 1998
1.3 COPY PROCESS AROUND THE DURM
10
11
12
3
4
5
6
9
7
8
A246V502.WMF
1. OPC DRUM
The organic photo conductive (OPC) drum (100 mm diameter) has high resistance
in the dark and low resistance under light.
2. DRUM CHARGE
In the dark, the charge corona unit gives a uniform negative charge to the OPC
drum. The charge remains on the surface of the drum. The amount of negative
charge on the drum is proportional to the negative grid bias voltage applied to the
grid plate on the charge corona unit.
3. EXPOSURE
An image of the original is reflected to the OPC drum surface via the optics section.
The charge on the drum surface is dissipated in direct proportion to the intensity of
the reflected light, thus producing an electrical latent image on the drum surface.
The amount of charge remaining as a latent image on the drum depends on the
exposure lamp intensity controlled by the exposure lamp voltage.
4. ERASE
The erase lamp illuminates the areas of the charged drum surface that will not be
used for the copy image. The resistan ce of drum in the illuminated areas drops and
the charge on those areas dissipates.
1-8
21 September 1998 COPY PROCESS AROUND THE DURM
5. DRUM POTENTIAL SENSOR
The drum potential sensor detects the electric potential on the drum to compensate
image processing elements.
6. DEVELOPMENT
Positively charged toner is attracted to the negatively charged areas of the drum,
thus developing the latent image. (The positive triboelectric charge of the toner is
caused by friction between the carrier and toner particles.)
The development bias voltage applied to the development roller shaft controls two
things:
1) The threshold level if toner is attracted to the drum or toner remains on the
development roller.
2) The amount of toner to be attracted to the drum.
The higher the negative development bias voltage is, the less toner is attracted to
the drum surface.
7. PRE-TRANSFER LAMP (PTL)
The PTL illuminates the drum to remove almost all the negative charge from the
exposed areas of the drum. This makes image transfer easier.
Overall
Information
8. IMAGE TRANSFER
Paper is fed to the drum surface at the proper timing so as to align the copy paper
and the developed image on the drum surface. Then, a negative charge is applied
to the reverse side of the copy paper by the transfer belt, producing an electrical
force which pulls the toner particles from the drum surface onto the copy paper. At
the same time, the copy paper is electrically attracted to the transfer belt.
9. PAPER SEPARATION
Paper separates from the OPC drum by the electrical attraction between the paper
and the transfer belt. The pick-off pawls help to separate the paper from the drum.
10. CLEANING
The cleaning brush removes toner remaining on the drum after image transfer and
the cleaning blade scrapes off all the remaining toner.
11. QUENCHING
Light from the quenching lamp electrically neutralizes the charge potential of the
drum surface.
1-9
MECHANICAL COMPONENT LAYOUT 21 September 1998
1.4 MECHANICAL COMPONENT LAYOUT
34567891011
12
39
38
37
36
35
2
13
14
1
15
16
17
18
19
20
21
34 33 32 31 30 29 41 40 2323
22
A246V503.WMF
24
1-10
28
25
26
27
A246V504.WMF
21 September 1998 MECHANICAL COMPONENT LAYOUT
1. 3rd Mirror
2. 2nd Mirror
3. 1st Mirror
4. Exposure Lamp
5. Lens
6. Cleaning Brush
7. Cleaning Blade
8. Quenching Lamp
9. Charge Corona Unit
10. OPC Drum
11. 6th Mirror
12. 4th Mirror
13. 5th Mirror
14. Erase Unit
15. Drum Potential Sensor
22. Registration Rollers
23. Transfer Belt
24. Vertical Transport Rollers
25. Tandem LCT Tray
26. Universal Tray (550-sheet)
27. 550-sheet Tray
28. Toner Collection Bottle
29. Transfer Belt Cleaning Blade
30. Hot Roller
31. Pressure Roller
32. Jogger Fences
33. Duplex Positioning Roller
34. Duplex Pick-up Roller
35. Duplex Feed Roller
36. Separation Belt
Overall
Information
16. Toner Hopper
17. Development Unit
18. Pre-Transfer Lamp
19. Pick-up Roller
20. Feed Roller
21. Separation Roller
37. Junction Gate
38. Exit Rollers
39. Optics Cooling Fan
40. Transfer Belt Cleaning Bias Roller
41. Transfer Belt Bias Roller Blade
1-11
DRIVE LAYOUT 21 September 1998
1.5 DRIVE LAYOUT
917
10
2
4
5
8
3
6
A246V505.WMF
Main Motor
Scanner Drive Motor
Fusing/Duplex Drive Motor
Paper Feed Motor
Toner Collection Motor
Registration Motor
By-pass Feed Motor
By-pass Feed Clutch
Development Drive Motor
1. To OPC Drum
2. To Scanner Unit
3. To Transfer Belt Unit
4. To Paper Exit Unit
5. To Fusing Unit
6. To Duplex Unit
7. To Cleaning Unit
8. To Paper Feed Units
9. To Toner Hopper
10. To Development Unit
1-12
21 September 1998 PAPER PATH
1.6 PAPER PATH
1.6.1 STANDARD COPYING
[D]
[F]
[E]
[C]
[B]
[A]
Overall
Information
[A]
A246V506.WMF
Paper feed begins from the exterior LCT, by-pass feed table or paper feed stations
in the paper tray unit. The copy paper then follows one of two paths inside the
copier. The path followed depends on which mode the operator has selected. For
copy processing, all sheets follow the same paths from the paper feed mechanism
[A] through the registration rollers [B], transfer belt [C], and fusing unit [D]. After
that, copies are delivered to the sorter bins [E] or proof tray [F], however, 2 sided
copies are diverted for further processing.
1-13
PAPER PATH 21 September 1998
1.6.2 MULTIPLE 2-SIDE COPYING
a. Front Side
b. Rear Side
[B]
[A]
[D]
[C]
A246V507.WMF
A246V508.WMF
In this mode the junction gate [A] directs sheets exiting the fusing unit to the duplex
tray entrance. After that, all sheets follow the path through the duplex entrance
rollers [B].
After all front side copying is fed, the sheets on the duplex tray are fed in order
from the bottom to the top and follow the path through the duplex feed mechanism
and vertical transport rollers [C] to the registration rollers [D]. After that, these
sheets follow the same path as standard copying from the registration rollers to the
sorter.
1-14
21 September 1998 ELECTRICAL COMPONENT DESCRIPTIO N
1.7 ELECTRICAL COMPONENT DESCRIPTION
Refer to the electrical component layout on the reverse side of the point-to-point
diagram for the location of the components using the symbols and index numbers.
Symbol Name Function Index No.
Motors
M1 Scanner Drives the 1st and 2nd scanners. 5
M2 3rd Scanner Drives the 3rd scanner. 11
M3 Lens Horizontal Shifts the lens vertical position. 10
M4 Lens Vertical Shifts the lens horizontal position. 19
M5 Main Drives the main unit components. 120
M6 Development Dr ives the development unit. 121
M7
M8
M9
M10
M11
M12
M13
M14
M15
M16 By-pass Feed Drives the by-pass feed rollers. 124
M17 Registration Drives the r eg istr ation rollers. 123
M18
M19
M20 Optics Cooling Fan Removes heat from the optics unit. 21
M21
M22
M23
M24
Toner Bottle
Charge Wire
Cleaner
Fusing/Duplex Drives the f using unit, the duplex unit,
Toner Collection
Toner Recycle Drives the air pump to send recycled
Paper Feed Drives all feed and transport rollers in the
1st Lift
2nd Lift Raises the bottom plate in the 2nd paper
3rd Lift Raises and lowers the bottom plat e in the
Rear Fence Moves the paper stack in the left tandem
Jogger
Optics Board
Cooling Fan
Drum Cooling Fan Cools the drum unit to removes heat
Duplex Cooling Fan
Exhaust Fan Removes heat from around the fusing
Rotates the toner bottle to supply toner to
toner hopper.
Drives the charge wire cleaner to clean
the charge wire.
and the exit rollers.
Transports the collected toner in the
toner recycle unit for toner recycle.
toner to the development unit.
paper tray unit.
Raises the bottom plate in the 1st paper
tray.
tray.
3rd paper tray.
tray to the right tandem tray.
Drives the jogger fences to square the
paper stack in the duplex unit.
Removes heat from around the optics
board.
from around the duplex unit.
Cools the paper on the duplex tray to
reduce the heat around the drum.
unit.
133
30
119
126
129
94
95
97
98
55
43
118
106
114
104
Overall
Information
1-15
ELECTRICAL COMPONENT DESCRIPTION 21 Sept ember 1998
Symbol Name Function Index No.
Magnetic Clutches
MC1
Toner Supply
Turns the toner supply roller to supply
toner to the development unit.
122
MC2 Toner Recycling Dr ives the toner recycling unit. 125
MC3 1st Feed Starts paper feed from tray 1. 75
MC4 2nd Feed Starts paper feed from tray 2. 79
MC5 3rd Feed Starts paper feed from tray 3. 82
MC6 By-pass Feed Starts paper feed from the by-pass table. 64
Duplex Transport Drives the duplex transport rollers to
MC7
transport the paper to the vertical
39
transport rollers.
MC8
Duplex Feed Starts paper feed out of the duplex tray
to the duplex transport rollers.
38
Switches
SW1 Main Provides power to the copier. 117
SW2
SW3
SW4
Front Door Safety Cuts the power line and detects is the
front door is opened or not.
Toner Collection
Bottle
2nd Paper Size
Detects if the toner collection bottle is set
or not.
Determines what size paper is in the 2nd
paper tray.
115
128
100
SW5 3rd Tray Set Detects if the 3rd tray is set or not. 99
SW6
By-pass Table Detects if by-pass feed table is open or
closed.
62
Solenoids
SOL1
SOL2
SOL3
SOL4
SOL5
SOL6
SOL7
SOL8
SOL9
SOL10
Transfer Belt
Positioning
Controls the up-down movement of the
transfer belt unit.
1st Pick-up Controls the up-down movement of the
pick-up roller in tray 1.
2nd Pick-up
Controls the up-down movement of the
pick-up roller in tray 2.
3rd Pick-up Controls the up-down movement of the
pick-up roller in tray 3.
By-pass Pick-up Contr ols the up-down movement of the
pick-up roller for by-pass feed.
1st Separation
Roller
2nd Separation
Roller
3rd Separation
Roller
Right Tandem Lock
Controls the up-down movement of the
separation roller in tray 1.
Controls the up-down movement of the
separation roller in tray 2.
Controls the up-down movement of the
separation roller in tray 3.
Locks the right tandem tray during
transporting the paper from right tray to
left tray.
Left Tandem Lock Locks the left tandem tray so that it can
be separated from the right tandem tray.
34
74
78
83
63
76
81
84
96
101
1-16
21 September 1998 ELECTRICAL COMPONENT DESCRIPTIO N
Symbol Name Function Index No.
SOL11
SOL12
SOL13
SOL14
SOL15
SOL13
Front Side Fence
Rear Side Fence Contr ols the open and close movement
Duplex Positioning Controls the up-down movement of the
Pressure Arm
Guide Plate Opens the guide plate when a paper
Junction Gate Moves the junction gate to direct copies
Controls the open and close movement
of the front side fence.
of the rear side fence.
positioning roller.
Presses the paper on the duplex tray
against the duplex feed rollers.
misfeed occurs around this area.
to the duplex tray or to the paper exit.
54
49
40
44
67
60
Sensors
S1
S2
S3
S4
Scanner HP Informs the CPU when the 1st and 2nd
scanners are at the home position.
3 rd Scanner HP
Informs the CPU when the 3rd scanner is
at the home position.
Lens Vertical HP Informs the CPU when the lens is at the
full-size position.
Lens Horizontal HP Informs the CPU when the lens is at the
horizontal home position.
2
9
7
12
S5 APS Detects original size. 20
S6
Auto Image Density
Senses the background density of the
original.
6
S7 Drum Potential Det ects the drum surface potential. 31
S8
S9
Toner Density
Image Density Detects the density of the ID sensor
Detects the amount of toner in the
developer.
pattern on the drum.
37
32
S10 Toner Near End Detects the toner end condition. 36
1st Paper Feed Controls the 1st paper feed clutch off/on
S11
timing and the 1st pick-up solenoid off
91
timing.
2nd Paper Feed Controls the 2nd paper feed clutch off/on
S12
timing and the 2nd pick-up solenoid off
89
timing.
3rd Paper Feed
S13
Controls the 3rd paper feed clutch off/on
timing and the 3rd pick-up solenoid off
87
timing.
S14
S15
S16
S17
1st Lift Detects when the paper in tray 1 is at the
correct height for paper feed.
2nd Lift
Detects when the paper in tray 2 is at the
correct height for paper feed.
3rd Lift Detect s when the paper in tray 3 is at the
correct height for paper feed.
1st Paper End Informs the CPU when tray 1 runs out of
paper.
93
80
85
92
Overall
Information
1-17
ELECTRICAL COMPONENT DESCRIPTION 21 Sept ember 1998
Symbol Name Function Index No.
S18
S19
S20
S21
S22
S23
S24
2nd Paper End
3rd Paper End Informs the CPU when tray 3 runs out of
By-pass Paper End Informs the CPU that there is no paper in
1st Paper Near End
2nd Paper Near
End
3rd Paper Near End Informs the CPU when the paper in tray
Right Tray Down
Informs the CPU when tray 2 runs out of
paper.
paper.
the by-pass feed table.
Informs the CPU when the paper in tray
1 is almost finished.
Informs the CPU when the paper in tray
2 is almost finished.
3 is almost finished.
Informs the CPU when the bottom plate
is completely lowered, to stop the 1st tray
90
88
65
53
77
86
52
lift motor.
S25
S26
S27
S28
S29
S30
S31
S32
Right Tray Paper Detects whether there is paper in the
right tandem tray.
Front Side Fence
Open
Front Side Fence
Close
Rear Side Fence
Open
Rear Side Fence
Close
Informs the CPU when the front side
fence is open.
Informs the CPU when the front side
fence is close.
Informs the CPU when the rear side
fence is open.
Informs the CPU when the rear side
fence is close.
Rear Fence HP Informs the CPU when the tandem tray
rear fence is in the home position.
Rear Fence Return Informs the CPU when the tandem tray
rear fence is in the return position.
Left Tandem Paper Informs the CPU when the left tandem
tray runs out the paper.
50
58
57
48
47
59
51
56
S33 Paper Guide Detect s the misfeeds. 61
S34
Duplex Entrance
Detects the leading edge of the paper to
determine duplex feed clutch off timing.
45
Duplex Transport Detects the leading edge of the paper to
S35
control the jogger motor and the
42
positioning solenoid on timing.
Duplex Exit
S36
Detects the leading edge of the paper to
determine duplex transport clutch on
42
timing.
S37 Duplex Paper End Detects the paper in the duplex tray. 46
S38
S39
Jogger HP Detects if the duplex jogger fences at the
home position or not.
Vertical Transport
Detects the leading edge of the paper to
determine the paper feed timing of next
41
69
sheet.
S40
Guide Plate
Position
Detects whether the registration guide
plate is closed.
68
1-18
21 September 1998 ELECTRICAL COMPONENT DESCRIPTIO N
Symbol Name Function Index No.
S41
Registration
Detects misfeeds and controls the
registration roller on-off timing.
70
S42 Fusing Exit Detects misfeeds. 72
S43 Exit Detects misfeeds. 73
S44
S45
S46
S47
Auto Response
Toner Overflow Detects when the toner collection bottle
Original Length
(LT version only)
Platen Cover
Position 1 (Option)
Returns the display from the screen
saver.
is full.
Detects the original length.
Inform the CPU that the platen cover is in
the up or down position (related to
17
127
8
3
APS/ARE function).
S48
Platen Cover
Position 2 (Option)
Inform the CPU that the platen cover is in
the up or down position to detect if the
4
original has been removed or not.
PCBs
PCB1 Main Controls all machine functions. 107
PCB2
AC Drive Provides ac power to the fusing lamp and
exposure lamp.
102
PCB3 DC Power Supply Provides dc power. 110
PCB4 Optic Control Controls all optics components. 105
PCB5
PCB6
PCB7
Paper Feed Control Controls all components in the paper
bank.
Operation Panel
Control
Left Operation
Panel
Controls LEDs and LCD on the operation
panel.
Interfaces the LEDs, keys, and the auto
response sensor on the left operation
109
15
18
panel.
PCB8
PCB9
Right Operation
Panel
By-pass Paper Size Inform the CPU what size of the paper is
Interfaces the LEDs and keys on the right
operation panel.
in the by-pass feed table.
13
66
Overall
Information
Lamps
L1
Exposure Lamp Applies high intensity light to the original
for exposure.
L2 Fusing Lamps Provide heat t o the hot roller. 24
L3
L4
L5
Quenching Neutralizes any charge remaining on the
drum surface after cleaning.
Erase
Discharge the drum outside of the image
area.
Pre-transfer Reduce the charge on the drum surface
before transfer.
1-19
23
28
29
33
ELECTRICAL COMPONENT DESCRIPTION 21 Sept ember 1998
Symbol Name Function Index No.
Power Packs
Charge
PP1
Provides high voltage for the charge
corona wires and the grid plate.
Interfaces the QL, PTL, and charge wire
27
cleaner motor control signals.
Development Provides hig h volt age for the
PP2
development unit.
Interfaces the transfer p.p. and the
108
charge p.p. signals.
Transfer Provides high voltage for the transfer
PP3
belt.
Interfaces the transfer belt positioning
35
solenoid control signal.
Heaters
H1
Optic
Anti-condensation
Turns on when the main switch is off to
prevent moisture from forming on the
16
optics.
H2
Transfer
Anti-condensation
Turns on when the main switch is off to
prevent moisture from forming on the
134
optics.
H3
H4
Upper Tray Turns on when the main switch is off to
keep paper dry in the paper tray.
Lower Tray
Turns on when the main switch is off to
keep paper dry in the paper tray.
131
130
Thermistors
TH1
Optic
Monitors the temperature of the optics
cavity.
TH2 Fusing Detects the temperature of the hot roller. 25
TH3
Drum Monitors the temperature of the OPC
drum.
Others
CB1
CO1
CO2
LA1
LCD1
Circuit Breaker Provides back-up high current protection
for the electrical components.
Total Counter Keeps track of the total number of copies
made.
Key Counter
Keeps track of the total number of copies
made when the key counter is set.
Lightening Arrestor Removes current surges from the ac
input lines.
LCD Displays the operation menus and
messages.
NF1 Noise Filter Remove the electrical noise. 112
RA1 Main Power Relay Contro ls main power. 103
TF1
Fusing Thermofuse Opens the fusing lamp circuit if the fusing
unit overheats.
1
32
113
132
-
116
14
26
1-20
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