Ricoh FW780 Service manual

J2SS-C3

(Machine Code: B047/B048)

Service Manual

– Insert Version –

The B047/B048 machines are based on the A163/A251/A252 copiers. Only the differences from the base copier are described in the following pages.

Therefore, this documentation should be treated as an insert version of the base copier’s service manual. It should always be utilized together with the base copier’s service manual.

INSERTION PROCEDURE OF SERVICE MANUAL

1. Replace the book spine tag with the new one.

2. Insert the B047/B048 service manual a fter the A1 63/A 25 1/A252 manual.

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 peripherals 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 hard may cause it to drop onto the floor. While moving the copier, push the table.

7. When the main switch is turned on, the machine will suddenly start turning to perform the developer initialization. Keep hands away from any mechanical and electrical components during this period.

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.

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 photoconductors according to local regulations. (These are non-toxic supplies.)

3. Dispose of replaced parts in accordance with local regulations.

This manual describes new items for the J2SS-C3 (B 04 7/B048). Please refer to the J2SS Mark II (A251/A252) manual for the descriptions marked with “*” in page column.

1. OVERALL MACHINE INFORMATION........................................ 1-1

1.1 SPECIFICATIONS.....................................................................................1-1

1.2 PAPER PATH............................................................................................1-3

1.3 DRUM PROCESSES ............................................................................... *

1.4 MECHANICAL COMPONENTS................................................................1-4

1.5 DRIVE LAYOUT....................................................................................... *

1.6 ELECTRICAL COMPONENTS..................................................................1-6

2. DETAILED SECTION DESCRIPTIONS ...................................... 2-1

2.1 DRUM....................................................................................................... *

2.1.1 DRUM CHARACTERISTICS........................................................... *

2.1.2 DRUM DRIVE.................................................................................. *

2.2 CHARGE.................................................................................................. *

2.2.1 OVERVIEW..................................................................................... *

2.2.2 CHARGE CORONA CIRCUIT......................................................... *

2.2.3 CORONA UNIT VENTILATION....................................................... *

2.3 EXPOSURE...............................................................................................2-1

2.3.1 OVERVIEW..................................................................................... *

2.3.2 PAPER AND ORIGINAL FEED (B048 ONLY)..................................2-1

Basic Operation (Manual Feed)........................................................... *

Original Jam Check Timing.................................................................. *

Drive Mechanism................................................................................. *

Original Positioning...............................................................................2-1

Scanning ...............................................................................................2-2

Start Key Enable...................................................................................2-3

2.3.3 FL REGULATOR CONTROL........................................................... *

2.3.4 MANUAL ID CONTROL................................................................... *

Manual ID Control................................................................................ *

2.4 DEVELOPMENT.......................................................................................2-4

2.4.1 OVERVIEW..................................................................................... *

2.4.2 DRIVE MECHANISM....................................................................... *

2.4.3 CROSS-MIXING.............................................................................. *

2.4.4 TONER DENSITY CONTROL..........................................................2-4

Toner Near End Condition................................................................... *

Recovery from Toner End Condition.....................................................2-5

Toner Density Sensor.......................................................................... *

2.4.5 DEVELOPMENT BIAS.................................................................... *

Basic Concept...................................................................................... *

Manual Image Density Bias................................................................. *

2.4.6 TONER SUPPLY............................................................................. *

2.5 IMAGE TRANSFER AND PAPER SEPARATION.................................... *

2.5.1 PRE-TRANSFER LAMP (PTL)........................................................ *

2.5.2 IMAGE TRANSFER......................................................................... *

2.5.3 PAPER SEPARATION.................................................................... *

2.5.4 PICK-OFF MECHANISM................................................................. *

2.5.5 T/S CORONA CIRCUIT ................................................................... *

2.6 CLEANING............................................................................................... *

2.6.1 OVERVIEW..................................................................................... *

2.6.2 USED TONER COLLECTION..........................................................2-6

2.7 QUENCHING............................................................................................ *

2.8 FUSING AND PAPER EXIT......................................................................2-7

2.8.1 OVERVIEW......................................................................................2-7

2.8.2 DRIVE MECHANISM....................................................................... *

Fusing Unit Drive................................................................................. *

2.8.3 TEMPERATURE CONTROL............................................................2-8

Fusing Circuit Operation...................................................................... *

Overheat Protection............................................................................. *

Hot Roller Temperature Control............................................................2-8

2.8.4 TEMPERATURE CONTROL........................................................... *

The Ready Condition........................................................................... *

Fusing Unit Operating Modes.............................................................. *

2.8.5 ENERGY SAVER FUNCTION......................................................... *

2.8.6 FUSING ENTRANCE GUIDE HEIGHT............................................ *

2.9 OTHERS .................................................................................................. *

2.9.1 ROLL CUTTING RAIL ..................................................................... *

2.10 ENERGY STAR COMPLIANT MACHINES

(ALL THE DESTINATION)......................................................................2-9

3. INSTALLATION ........................................................................... 3-1

3.1 INSTALLATION REQUIREMENTS...........................................................3-1

3.1.1 ENVIRONMENT...............................................................................3-1

3.1.2 MINIMUM SPACE REQUIREMENTS...............................................3-2

3.1.3 MACHINE LEVEL.............................................................................3-2

3.1.4 POWER SOURCE............................................................................3-3

3.2 INSTALLATION PROCEDURE.................................................................3-4

3.2.1 COPIER............................................................................................3-4

Accessory Check.................................................................................. 3-4

B048 copier only (step 21)..................................................................3-12

B047 copier only (step 22 and 23)......................................................3-12

Both copiers (step 24 and 25).............................................................3-12

3.2.2 TABLE (B439) ................................................................................3-13

Accessory Check................................................................................ 3-13

3.2.3 COPY tray (B440)........................................................................... 3-15

Accessory Check................................................................................ 3-15

3.2.4 ROLL FEEDER1 and 2 (B435/b436)..............................................3-19

Accessory Check................................................................................ 3-19

3.2.5 Roll Cutting Rail (B437)..................................................................3-28

4. SERVICE TABLES...................................................................... 4-1

4.1 PREVENTIVE MAINTENANCE SCHEDULE........................................... *

4.1.1 PM TABLE....................................................................................... *

4.1.2 REGULAR PM PROCEDURE......................................................... *

4.2 SERVICE TABLES................................................................................... *

4.2.1 TEST POINTS................................................................................. *

Main Board .......................................................................................... *

Charge/Bias/Grid Power Pack............................................................. *

4.2.2 VARIABLE RESISTORS................................................................. *

Charge/Bias/Grid Power Pack............................................................. *

T&S Power Pack.................................................................................. *

4.3 SERVICE TOOLS......................................................................................4-1

4.3.1 SERVICE PROGRAM MODE...........................................................4-1

Service Program Mode Access Procedure.......................................... *

Service Program Mode Table...............................................................4-1

4.3.2 INPUT/OUTPUT CHECK MODE....................................................4-23

Input/Output Check Mode Access Procedure...................................... *

Input Check Mode Table.....................................................................4-23

Output Check Mode Table..................................................................4-23

4.3.3 POWER ON INITIAL SETTING MODE........................................... *

4.4 JAM CODE LIST.....................................................................................4-25

4.4.1 ACCESS PROCEDURE.................................................................. *

4.4.2 JAM CODE TABLE.........................................................................4-25

Fixed Paper Size Pattern Data (SP No. 22)........................................4-27

Default Settings for Each Destination (SP#-1)....................................4-28

4.5 SPECIAL TOOLS AND LUBRICANTS..................................................... *

4.6 SERVICE REMARKS..............................................................................4-29

4.6.1 DRUM UNIT .................................................................................... *

Drum.................................................................................................... *

4.6.2 CHARGE CORONA......................................................................... *

4.6.3 OPTICS........................................................................................... *

4.6.4 DEVELOPMENT ............................................................................. *

4.6.5 TRANSFER AND SEPARATION..................................................... *

4.6.6 CLEANING UNIT............................................................................. *

4.6.7 FUSING UNIT.................................................................................. *

4.6.8 ORIGINAL FEED............................................................................. *

4.6.9 PAPER FEED.................................................................................. *

4.6.10 ROLL FEEDER.............................................................................. *

4.6.11 OTHERS........................................................................................ *

4.6.12 AC DRIVE BOARD.......................................................................4-29

Service Remark for 220 ~ 240 V Version............................................4-29

Service Remarks for 120 V Version....................................................4-30

5. REPLACEMENT AND ADJUSTMENT........................................ 5-1

5.1 EXTERIOR COVERS............................................................................... *

5.1.1 LEFT SIDE COVER REMOVAL...................................................... *

Left Upper Cover ................................................................................. *

Left Lower Cover.................................................................................. *

iii

5.1.2 RIGHT SIDE COVER REMOVAL .................................................... *

Right Upper Cover............................................................................... *

Right Lower Front, Right Lower Middle, and Right Lower

Rear Covers......................................................................................... *

5.1.3 REAR COVER REMOVAL .............................................................. *

Rear Cover .......................................................................................... *

5.2 OPTICS.................................................................................................... *

5.2.1 ORIGINAL FEED UNIT REMOVAL (A252 ONLY)........................... *

5.2.2 EXPOSURE GLASS REMOVAL (A252 ONLY)............................... *

5.2.3 EXPOSURE LAMP REMOVAL (A252 ONLY)................................. *

5.2.4 FIBER OPTICS ARRAY REMOVAL (A252 ONLY).......................... *

5.2.5 LIGHT SENSOR REPLACEMENT (A252 ONLY)............................ *

5.2.6 SYNCHRO-CUT LENGTH ADJUSTMENT (A252 ONLY)............... *

5.3 DEVELOPMENT...................................................................................... *

5.3.1 DEVELOPMENT UNIT REMOVAL.................................................. *

5.3.2 DEVELOPER REMOVAL................................................................ *

5.3.3 TONER DENSITY SENSOR REPLACEMENT................................ *

5.3.4 PTL REPLACEMENT...................................................................... *

5.3.5 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT ......................... *

Bias Voltage for Image Area................................................................ *

Bias Voltage for Non-image Area ........................................................ *

5.4 DRUM UNIT ..............................................................................................5-1

5.4.1 DRUM UNIT REMOVAL................................................................. *

5.4.2 DRUM REPLACEMENT...................................................................5-1

5.4.3 CLEANING BLADE REPLACEMENT.............................................. *

5.4.4 CHARGE CORONA UNIT REMOVAL............................................. *

5.4.5 CHARGE CORONA WIRE REPLACEMENT .................................. *

5.4.6 PICK-OFF PAWL UNIT REMOVAL................................................. *

5.4.7 GRID VOLTAGE ADJUSTMENT..................................................... *

5.4.8 DRUM CURRENT ADJUSTMENT .................................................. *

Charge Current Adjustment................................................................. *

Transfer Current Adjustment................................................................ *

Separation Current Adjustment............................................................ *

5.5 FUSING.....................................................................................................5-2

5.5.1 FUSING UNIT REMOVAL............................................................... *

5.5.2 HOT ROLLER REPLACEMENT...................................................... *

5.5.3 PRESSURE ROLLER REPLACEMENT.......................................... *

5.5.4 PRESSURE ROLLER THERMISTOR REPLACEMENT................. *

5.5.5 PRESSURE ROLLER STRIPPER UNIT REPLACEMENT.............. *

5.5.6 HOT ROLLER STRIPPER UNIT REPLACEMENT.......................... *

5.5.7 HOT ROLLER THERMISTOR REPLACEMENT ..............................5-2

5.5.8 FUSING THERMOFUSE REPLACEMENT......................................5-2

5.5.9 FUSING TEMPERATURE ADJUSTMENT.......................................5-3

5.6 T & S CORONA UNIT .............................................................................. *

5.6.1 T & S CORONA UNIT REMOVAL................................................... *

5.6.2 TRANSFER AND SEPARATION CORONA WIRE

REPLACEMENT.............................................................................. *

Preparation.......................................................................................... *

Separation Corona Wire Replacement................................................ *

Transfer Corona Wire Replacement .................................................... *

5.7 OTHERS .................................................................................................. *

5.7.1 OZONE FILTER REPLACEMENT................................................... *

5.7.2 ANTICONDENSATION HEATER INSTALLATION.......................... *

5.8 COPY QUALITY ADJUSTMENT...............................................................5-4

5.8.1 LIGHT SENSOR ADJUSTMENT..................................................... *

5.8.2 IMAGE BIAS ADJUSTMENT........................................................... *

5.8.3 TONER DENSITY ADJUSTMENT................................................... *

5.8.4 REGISTRATION ADJUSTMENT......................................................5-4

6. TROUBLESHOOTING ................................................................ 6-1

6.1 COPY QUALITY TROUBLESHOOTING.................................................. *

6.1.1 LOW IMAGE DENSITY................................................................... *

6.1.2 UNEVEN COPY IMAGE.................................................................. *

6.1.3 DIRTY BACKGROUND................................................................... *

6.1.4 BLACK LINE OR BAND................................................................... *

6.1.5 ENTIRELY BLANK COPY............................................................... *

6.1.6 PAPER CREASING......................................................................... *

6.2 SERVICE CALL CONDITIONS................................................................. 6-1

6.2.1 SC CODE DESCRIPTIONS .............................................................6-1

SC Code E-1: Exposure Lamp Abnormal.............................................6-1

SC Code E-2: Fusing Thermofuse Open..............................................6-1

SC Code E-3: Hot Roller Thermistor Open...........................................6-1

SC Code E-4: Hot Roller Thermistor Short...........................................6-2

SC Code E-5: Pressure Roller Thermistor Open..................................6-2

SC Code E-6: Pressure Roller Thermistor Short..................................6-2

SC Code E-7: Fusing Overheat............................................................6-2

SC Code E-8: Fusing Warm-up Error...................................................6-3

SC Code E-9: Toner Density Sensor Abnormal....................................6-3

SC Code E-10: Main Motor Abnormal...................................................6-3

SC Code E-11: Toner Density Sensor Adjustment Error......................6-3

SC Code E-13: Total Counter Abnormal...............................................6-4

SC Code E-14: Zero Cross Signal Detection Abnormal........................6-4

SC Code E-15: Main Switch Abnormal................................................. 6-4

SC Code E-17: Unstable Fusing Temperature .....................................6-4

SC Code E-18: Fusing Lamp Continuous Light....................................6-4

6.3 BLOWN FUSE TABLE ..............................................................................6-5

6.3.1 POWER SUPPLY UNIT....................................................................6-5

Europe Version.....................................................................................6-5

U.S.A. Version......................................................................................6-5

AC Drive Board.....................................................................................6-5

ROLL FEEDER UNIT (B435/B436)

1. OVERALL MACHINE INFORMATION.................................B436-1

1.1 SPECIFICATIONS.............................................................................. B436-1

1.2 ELECTRICAL COMPONENT DESCRIPTIONS................................. B436-2

2. DETAILED SECTION DESCRIPTIONS ................................B436-3

2.1 MECHANICAL OPERATION.............................................................. B436-3

2.1.1 BASIC OPERATION.................................................................. B436-3

2.1.2 ROLL EDITION DETECTION.................................................... B436-5

2.1.3 DRIVE MECHANISM................................................................. B436-5

2.1.4 CUTTER OPERATION.............................................................. B436-6

3. REPLACEMENT A ND ADJUSTMENT..................................B436-7

3.1 CUTTER UNIT REPLACEMENT........................................................ B436-7

3.2 ROLL FEED LEADING EDGE SENSOR REPLACEMENT................ B436-8

3.3 ROLL FEED UNIT REMOVAL............................................................ B436-9

3.4 ROLL FEED CLUTCH REPLACEMENT.......................................... B436-10

3.5 ROLL FEED MOTOR REPLACEMENT ........................................... B436-11

3.6 ROLL END SENSOR REPLACEMENT............................................ B436-12

3.7 CUT LENGTH ADJUSTMENT.......................................................... B436-13

Preset Cut : Adjustment standards: ±3 mm (for Length Shorter than 420 mm) ±5 mm (for 420 to 1,189 mm) ±11 mm

(3,000 mm) .................................................................................. B436-13

3.8 SIDE REGISTRATION ADJUSTMENT ............................................. B436-14

11 May, 2001 SPECIFICATIONS

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

Configuration: Table top Copy Process: Electrostatic transfer system Original Feed: Sheet feed Original Size: Maximum: 914 x 3,000 (36" x 118")mm

Minimum: A4 (8 Copy Size: Same as “Original Size” Copying Speed: 4 cpm (A1/D sideways) First Copy: 21 seconds (A1/D sideways): B047 copier

25 seconds (A1/D sideways): B048 copier Warm-up Time: Multi-Copy: B047: Single copies only,

Automatic Reset: 2 minutes after copying has finished (can be set to

Photoconductor: Organic photoconductor drum

Within 3 minutes (Room temperature 23°C)

B048: Up to 10 copies

1, 3, 4, or 5 minutes or to no auto reset)

" x 11") lengthwise

1/2

Overall

Information

Drum Charge: Scorotron corona wire and grid (Negative Charge) Reproduction Ratio: Exposure System: Slit exposure via fiber optic array Exposure Lamp: Fluorescent lamp (26 W) Development: Dual-component dry toner system Toner Replenishment: Cartridge system (750 g toner/cartridge) Toner Consumption: 1,860 A1 or D copies per cartridge (6% original) Development Bias: Negative Toner Density Control: Direct toner density detection using an induction

Image Density Adjustment: Development bias control + exposure control Paper Separation: Dual wire AC corona and pick-off pawls Cleaning: Cleaning blade Paper Feeding: Manual feed (roll feeder optional) Image Fusing: Teflon heat roller (upper) and a silicone rubber

1 : 1 (±0.5%)

sensor

pressure roller (lower) Fusing Lamp: Halogen lamp

(115 V: 1,200 W, 230 V: 1,200 W)

1-1

SPECIFICATIONS 11 May, 2001

Self-diagnostic Codes: 16 codes, displayed on the copy counter Power Source: 115 V/60 Hz, 12 A

220 ~ 240V/50, 60 Hz, 7A Power Consumption: Maximum: 1.4 kW

Warm-up: 1.3 kW

Ready: 0.04 to 1.3 kW

Copy cycle:1.4 kW Dimensions (W x D x H): B047: 1,080 x 570 x 490 mm

42.5" x 22.4" x 19.3"

B048: 1,080 x 623 x 480 mm

42.5" x 24.5" x 18.9"

Weight: B047: 79 kg, 174.0 lbs

B048: 80 kg, 176.0 lbs

Optional Equipment and Machine Configuration

Configuration

Main frame Optional equipment

Roll feeder (B435: 1 roll, B436: 2 rolls) —

B047 copier

B048 copier

Roll cutting rail (B437) — Table (B439) — Side guides (B438) — Roll feeder (B435: 1 roll, B436: 2 rolls) Copy tray (B440) Side guide (B438) —

Additional equipment

NOTE: 1) Roll cutting rail cannot be installed on the B048 copier.

2) Key counters cannot be installed on these copiers.

3) The B048 requires a roll feeder (either 1 roll or 2 rolls). While the roll feeders are shipped separately, they are not really optional. One must be installed for the B048 to function properly. .

Other Optional Equipment

• Roll Holder Unit (B394)

• Drum anti-condensation heater

Specifications are subject to change without notice.

1-2

11 May, 2001 PAPER PATH

1.2 PAPER PATH

- B047 copier -

- B048 copier -

Overall

Information

B047V102.WMF

A B

B048V102.WMF

A: Original Path B: Manual Feed Path C: Roll Feeder Path D: Paper Exit E: Original Path: Rear Feeder

There are two versions of this machine. The B047 is the basic version. It can only make one copy at a time. The B048 is the multi-print version. It can make multiple copies of an original (scanning and copying an original multiple times). Both versions can be equipped with either a single or a double paper roll.

1-3

MECHANICAL COMPONENTS 11 May, 2001

1.4 MECHANICAL COMPONENTS

19 18 17 16

20 21 22 1 2

4 5

6 7 8 9 10 11

1. 1st Original Feed Roller

2. 1st Press Rollers

3. Copy Tray

4. Exit Rollers

5. Fusing Exit Rollers

6. Hot Roller

7. Pressure Roller

8. Gas Spring

9. OPC Drum

10. T/S Corona Unit

11. Main Drive Unit

B047V101.WMF

12. Roll Feed Unit (1 roll or 2 rolls)

13. Roll Paper

14. Paper Registration Rollers

15. Manual Feed Table

16. Development Unit

17. Toner Cartridge

18. 2nd Original Feed Roller

19. Original Table

20. 2nd Original Press Roller

21. Exposure Lamp

22. Fiber Optic Array

1-4

11 May, 2001 MECHANICAL COMPONENTS

28 29

Overall

Information

23. Original Guide

24. Optional Copy Tray

25. Original Entrance Roller

26. Original Entrance Press Roller

B048V101.WMF

27. Original Roller Feed Motor

28. Original Rear Press Roller

29. Original Rear Roller

1-5

ELECTRICAL COMPONENTS 11 May, 2001

1.6 ELECTRICAL COMPONENTS

Refer to the electrical component layout on the reverse side of the Point to Point index (Water proof paper).

Name Function Index. No.

Motors

Main Drives all mechanical components except the fans

(DC Motor).

Exhaust Fan Removes the ozone built up around the drum

section to the ozone filter (DC Motor). Original Feed (B048 only)

Magnetic Clutches

Registration Drives the registration rollers. 30 Toner Supply Turns on to supply toner to the development unit. 31

Solenoids

Pick-off Pawl Moves the pick-off pawls against the drum. 6

Drives the original feed motor (DC Motor).

Switches

Main Supplies power to the copier. 17 Original & Paper Feed Safety Fusing Exit Safety Cuts AC power when the fusing exit unit is opened. 12 Used Toner Cover “Door Open” is displayed on the operation panel

Sensors

Door Open Indicates “Door Open” on the operation panel and Toner Density Detects the density of toner in the developer. 26

Original Registration Activates when the leading edge of the original Light Measures the intensity of the exposure lamp’s Entrance Feed Activates when copy paper is inserted (jam Registration Exit Detects jams through the fusing exit unit. 7

Original Entrance (B048 only) Original Rear (B048 only) Exit Cover Open Indicates “Door Open” in the operation panel and

Toner Overflow Detects whether the used toner tank is full or not. 46

Cuts AC power when the original or paper feed unit

are opened.

when the used toner cover is open.

prevents operation.

passes the front of the exposure glass.

output.

detector).

Activates when copy paper arrives at the

registration rollers (jam detector).

Measures the original length and detects jams. 43

Detects original jams. 44

prevents operation.

4 27 24 25

1-6

11 May, 2001 ELECTRICAL COMPONENTS

Name Function Index. No.

Printed Circuit Boards

Main Controls all copier functions both directly and

through other PCBs.

PSU Converts t h e voltag e from AC to DC voltage. 21 AC Drive Provides AC power to the fusing lamp and PSU. 15 FL Regulator Stabilizes power to the exposure lamp. 23 Operation Panel Controls the operation panel display. 10

Lamps

Exposure Provides light to reflect the original’s image onto

the drum (fluorescent lamp).

Fusing Provides heat to the fusing unit. 3 Pre-Transfer (PTL) Reduces the charge on the drum surface prior to

image transfer.

Quenching (QL) Neutralizes any charge remaining on the drum

surface after cleaning.

Power Packs

Charge/Bias/ Grid Power Pack

Transfer/Separation Provides high voltage power for the transfer corona

Provides high voltage power for the charge corona, charge grid, and development bias.

and separation.

19 16

Overall

Information

Thermistors

Hot Roller Monitors the hot roller’s surface temperature. 8 Pressure Roller Monitors the pressure roller’s surface temperature. 11

Thermofuses

Fusing Protects the fusing unit against overheating. 9

Heaters

Anti-condensation Keeps m oistur e from forming inside the copier

(option).

Others

Total Counter Keeps track of the total length of copies made

(Europe) or the total copies made (U.S.A.).

Circuit Breaker

Guards against voltage surges in the input power.

(Europe, Asia)/

Fuse (U.S.A.)

1-7

11 May, 2001 EXPOSURE

2. DETAILED SECTION DESCRIPTIONS

2.3 EXPOSURE

2.3.2 PAPER AND ORIGINAL FEED (B048 ONLY)

[E]

[C]

[G]

[D]

[L]

26 mm

[F]

[H]

10 mm

[I]

J: Original Rear Roller K: Original Rear Sensor L: Fiber Optics Array

[B]

[J]

[K]

[A]

Detailed

Descriptions

[M]

B047D500.WMF

B047D501.WMF

NOTE: For clarity’s sake, the following description will ref er to the paper’s edges

as edge [A] (furthest edge from the operator) and edge [B] (closest to the operator).

Original Positioning

In the B048 copier, edge [A] of the original is placed onto the original table. This activates the original entrance sensor [C].

The main motor turns the original entrance rollers [D]. The quenching lamp, development bias and PTL also turn on.

For proper feeding (especially for a thin original), the original entrance rollers rotate backwards (feeding towards the operator) for 300 ms. This ensures that the original is gripped firmly by both of the original entrance rollers [D], feeding it evenly.

2-1

EXPOSURE 11 May, 2001

4 seconds after the sensor is activated, the original feed motor starts rotating. This delay gives the user time to align edge [A] against the original entrance rollers [D]. This helps prevent skew.

The original is fed through the machine to the scanning start position [E]. This machine scans the original backwards, starting with edge [B] and scanning towards edge [A]. The original is now ready to scan.

Scanning

The original is scanned, moving back towards the operator. When edge [ A] activates the original registration sensor [F], the roll paper feed

motor turns on. Copy paper begins to feed, and the registration clutch is activated. When edge [B] reaches the original feed start posi tion [E] (26 mm ahead of the

original registration sensor [F]), the original feed motor stops to wait for the copy paper.

In the copy section, the registration clutch turns off once the copy paper’s leading edge is 10 mm past the registration sensor [H]. The voltage is now applied to the charge coro na.

The original feed motor begins rotating towards the operator again at 60 mm/s, and the original is delivered to the exposure glass. Light from the exposure lamp [M] is reflected off the paper to the fiber optics array [L].

Once the original’s edge [B] passes the original entrance sensor, the registration clutch and roll paper feed motor turn on agai n. The pap er feed res ume s and the copy paper is transported to the drum [I].

To measure the original length for cutting, the copier’s CPU measures the time from when the original registration sensor detects edge [A] until the original entrance sensor detects edge [B].

The copy paper length is measured by counting the number of steps as the roll paper feed motor (a stepper motor) turns. Just before the paper is cut, the feed motor speed doubles. This creates a buckle at the trailing edge of the copy paper. The feed motor then stops as the cutter unit cuts the paper. Copying, however, continues. The buckle provides the necessary slack while cutting.

When making duplicate copies, the original feed motor pauses, then changes directions again, and the original is fed back to the scanning position 200 mm/s. Once previous paper exits out of the roll feeder, the roll paper feed starts as well, and the process repeats.

After all copies are made, the original is delivered to the original table. If original hold mode is enabled (SP16), the original will stop with edge [A] caught by the original entrance rollers. The original can be fed out by pressing the ! key. If original hold mode is not enabled, the original feeds out completely, and is not caught.

2-2

11 May, 2001 EXPOSURE

Start Key Enable

When the start key enabled (SP34) is set, the start key acts as a starting trigger. In this mode, when the original activates the original registration sensor, edge [B] is delivered to the original registration sensor position. Everything pauses until the user presses the start key. Original feed and paper feed then resume.

Detailed

Descriptions

2-3

DEVELOPMENT 11 May, 2001

2.4 DEVELOPMENT

2.4.4 TONER DENSITY CONTROL

The toner supply amount ratio is determined by the following conditions.

Level

0 1

4 5

0 1

4 5

0 1

4 5

201 ~ 250

sheets

(120 ~ 150 m)

2.25 ≤ V

2.70

2.70 ≤ V

3.15

3.15 ≤ V

3.60

3.60 ≤ V

3.90

3.90 ≤ V

3.25 ≤ V

3.50

3.50 ≤ V

3.80

3.80 ≤ V

4.00

4.00 ≤ V

4.35

4.35 ≤ V

2.00 ≤ V

2.40

2.40 ≤ V

2.80

2.80 ≤ V

3.20

3.20 ≤ V

3.60

3.60 ≤ V

(30 ~ 60 m)

3.50 ≤ V

3.80 ≤ V

4.10 ≤ V

4.20 ≤ V

4.30 ≤ V

4.33 ≤ V

4.36 ≤ V

4.40 ≤ V

3.00 ≤ V

3.50 ≤ V

4.00 ≤ V

4.20 ≤ V

51 ~ 100

sheets

3.80

4.10

4.20

4.35

4.35 ≤ V

4.33

4.36

4.40

4.43

4.43 ≤ V

3.50

4.00

4.20

4.30

4.30 ≤ V

0 ~ 50 sheets

(~ 30 m)

< 4.00 VTS < 3.50 VTS < 3.00 VTS < 2.50 VTS < 2.25 VTS < 2.00

4.00 ≤ V

4.10

4.10 ≤ V

4.20

4.20 ≤ V

4.30

4.30 ≤ V

4.40

4.40 ≤ V

4.35 ≤ V

< 4.35 VTS < 4.30 VTS < 4.25 VTS < 3.75 VTS < 3.25 VTS < 2.75

4.38

4.38 ≤ V

4.40

4.40 ≤ V

4.42

4.42 ≤ V

4.45

4.45 ≤ V

4.00 ≤ V

< 4.00 VTS < 3.00 VTS < 2.50 VTS < 2.25 VTS < 2.00 VTS < 1.80

4.10

4.10 ≤ V

4.20

4.20 ≤ V

4.30

4.30 ≤ V

4.40

4.40 ≤ V

(60 ~ 90 m)

3.00 ≤ V

3.50 ≤ V

4.00 ≤ V

4.20 ≤ V

4.25 ≤ V

4.30 ≤ V

4.33 ≤ V

4.36 ≤ V

2.50 ≤ V

3.00 ≤ V

3.50 ≤ V

4.00 ≤ V

101 ~ 150

sheets

3.50

4.00

4.20

4.30

4.30 ≤ V

4.30

4.33

4.36

4.40

4.40 ≤ V

3.00

3.50

4.00

4.25

4.25 ≤ V

(90 ~ 120 m)

2.50 ≤ V

3.00 ≤ V

3.50 ≤ V

4.00 ≤ V

3.75 ≤ V

4.00 ≤ V

4.10 ≤ V

4.20 ≤ V

2.25 ≤ V

2.70 ≤ V

3.15 ≤ V

3.60 ≤ V

151 ~ 200

sheets

3.00

3.50

4.00

4.25

4.25 ≤ V

4.00

4.10

4.20

4.38

4.38 ≤ V

2.70

3.15

3.60

3.90

3.90 ≤ V

251 sheets ~

(150 m ~)

2.00 ≤ V

2.40

2.40 ≤ V

2.80

2.80 ≤ V

3.20

3.20 ≤ V

3.60

3.60 ≤ V

2.75 ≤ V

3.20

3.20 ≤ V

3.60

3.60 ≤ V

3.90

3.90 ≤ V

4.30

4.30 ≤ V

1.80 ≤ V

2.00

2.00 ≤ V

2.50

2.50 ≤ V

3.00

3.00 ≤ V

3.50

3.50 ≤ V

TS Level (Toner Supply Ratio) 0: No supply 1: 7.5% 2: 7.5% 3: 7.5% 4: 15% 5: 100%

Toner density control table has been changed for B047/B048 copiers.

2-4

11 May, 2001 DEVELOPMENT

Recovery from Toner End Condition

After replacing the toner cartridge (opening and closing the original feed unit), the main motor rotates the development unit for 60 seconds. During the first 30 seconds, toner is supplied at 100% of the supply amount until TS level reaches 3. The main motor continues to rotate the development unit for another 30 seconds. Then copies can be made.

If the TS level does not reach 3, the CPU stops the machine and displays the toner end condition. This prevents the operator from resetting the toner end condition by simply opening and closing original feed unit.

Detailed

Descriptions

2-5

CLEANING 11 May, 2001

2.6 CLEANING

2.6.2 USED TONER COLLECTION

[A]

[B]

B047D101.WMF

B047/B048 copiers have a used toner overflow sensor [A] and a used toner cover switch [B].

When the used toner overflow sensor detects that the used toner tank is full, the overflow indicator begins blinking on the operation panel. 30 more meters (A1/D size: 50 copies, SP51) can be copied. After that, the used toner overflow indicator stays ON, and the machine will not operate.

The used toner cover switch detects when the used toner cover is open. “Door open” is displayed on the operation panel, and the start key is disabled.

2-6

11 May, 2001 FUSING AND PAPER EXIT

2.8 FUSING AND PAPER EXIT

2.8.1 OVERVIEW

[A]

Detailed

Descriptions

B047D102.WMF

Two thermofuses [A] (184°C, 192°C) keep the fusing unit from overheati ng . Two thin-film thermistors measure the hot roller and pressure roller’s temperature. The hot roller is a thin-shell, Teflon coated roller. The thinne r roller allows a much-

shorter warm-up time. However, extra care should be taken while working around the hot roller. It is very easy to damage.

Like the A163/A251/A252 copiers, if the fusing temperature is lower than 60°C when the main switch is turned on, the machine assumes that it has not been used recently, and the main motor must rotate to generate the necessary triboelectric charge on the toner and developer.

In the A163/A251/A252 copiers, the main motor begins rotating immediately. However, the B047/B048 copiers have a thin shell hot roller and a contact thermistor. When cold, the thermistor is hard and might damage the roller. The machine waits until the hot roller temperature reaches 80°C. At that temperature the thermistor softens and the hot roller can rotate safely.

Except for the differences listed above, the B047/B048 copiers are identical to the A251 and A252 copiers. Please refer to A163/A251/A252 copier service manual for additional details.

2-7

FUSING AND PAPER EXIT 11 May, 2001

2.8.3 TEMPERATURE CONTROL

Hot Roller Temperature Control

Hot Roller Temp. (°C)

198

190

180

170

160

150

142

Mode 8

Mode 7

Mode 6

Mode 5

Mode 4

Mode 3

Mode 2

Mode 1

~60

63 66 69 72 75 78 81 84 87 90 93 96 99 102105108111 114 117 120~

Pressure Roller Temp. (°C)

198

190

185

180

110 115 120 125 130 135 140 145

Lower Limit

Mode 8

Operating Temperature

Lower Limit

B047D001.WMF

The relationship between the hot roller and pressure roller temperatures has been changed due to the thin-shell, Teflon coated roller.

2-8

11 May, 2001 ENERGY STAR COMPLIANT MACHINES (ALL THE DESTINATION)

2.10 ENERGY STAR COMPLIANT MACHINES (ALL THE DESTINATION)

In conjunction with the modification for the Energy Star compliance, field technicians need to understand the new operation modes, and must be able to configure the machine for the customer’s specific environment/requirements. This section lists all the differences between the Energy Star compliant machines and the previous models.

Mode Non-Energy Star Energy Star

Starts timing once the last copy job is complete. When the specified time has

Auto Off Mode Not available

passed, the copier turns off. The time can be adjusted from 1 to 240 minutes. Default: 30 minutes

CN102

-A3

-B13

24]

[24]

Detailed

Descriptions

Power Relay [

B047D002.WMF

Mode No. Function Data

Auto Shut-off Time

*15

Setting AOF Auto off enable. 0: Disable

*33

Determines the auto shut-off time.

2-9

1 ← 30 → 240

1: Enable

11 May, 2001 INSTALLATION REQUIREMENTS

3. INSTALLATION

3.1 INSTALLATION REQUIREMENTS

3.1.1 ENVIRONMENT

1. Temperature Range:

2. Humidity Range: 20% to 80% RH

3. Ambient Illumination: Less than 1,500 lux (do not expose to direct

4. Ventilation: Room air should turn over at least 3 times per hour.

5. Ambient Dust: Less than 0.10 mg/m3 (2.7 x 10-6 oz/yd3)

6. If the location is air-conditioned or heated, place the machine as follows: a) Where it will not be subjected to sudden temperature changes from low to

high, or vice versa.

b) Where it will not be directly exposed to cool air from an air conditioner in

the summer.

c) Where it will not be directly expos ed to heat.

7. Avoid exposure to corrosive gases.

8. Avoid installing anywhere higher than 2,000 m (6,500 ft) above sea level.

9. Place the machine on a strong and level base.

10. Avoid any area where the machine may be subjected to frequent, strong

vibration.

15°C to 30°C (50°F to 86°F)

sunlight).

Installation

3-1

INSTALLATION REQUIREMENTS 11 May, 2001

3.1.2 MINIMUM SPACE REQUIREMENTS

Back 600 mm

Left 600 mm

1. Front: 1,000 mm (39 in)

2. Back: 600 mm (24 in)

3. Right: 600 mm (24 in)

4. Left: 600 mm (24 in)

3.1.3 MACHINE LEVEL

Right 600 mm

Front 1,000 mm

B047I505.WMF

1. Front to back: Within 5 mm (0.2") of level

2. Right to left: Within 5 mm (0.2") of level

Make sure that the machine is level using a carpente r’s level.

3-2

11 May, 2001 INSTALLATION REQUIREMENTS

3.1.4 POWER SOURCE

Important:

The machine must be installed in a building/facility equipped with a protective device such as a circuit breaker, as the machine relies on such devices for protection against over-current and short circuits.

1. Input Voltage Level: 120 V, 60 Hz

More than 12 A (for U.S.A. version) 220 ~ 240 V, 50/60 Hz

More than 7 A (f or European version)

2. Permissible Voltage

±10%

Fluctuation:

3. Do not set anything on the power cord.

NOTE: 1) Make sure the plug is firmly inserted in the outlet.

2) Avoid multi-wiring.

Installation

3-3

INSTALLATION PROCEDURE 11 May, 2001

3.2 INSTALLATION PROCEDURE

3.2.1 COPIER

Accessory Check

Check the accessories and their quantities according to the following list:

- B048 copier -

Original Guides........................................................................ 6 pcs

Operating Instruction Holder.................................................... 1 pc

Operating Sheet ...................................................................... 1 pc

Caution Decal (-27 only).......................................................... 1 pc

Operating Instructions (-17 only).............................................. 1 pc

Original Guide Wire................................................................. 1 pc

- B047 copier -

Guide Wires............................................................................. 2 pcs

Copy Tray................................................................................ 1 pc

Copy Guide.............................................................................. 1 pc

Operating Instruction Holder.................................................... 1 pc

Operating Sheet ...................................................................... 1 pc

Caution Decal (-27 only).......................................................... 1 pc

Operating Instructions (-17 only).............................................. 1 pc

3-4

+ 144 hidden pages

Ricoh FW780 Service manual

INSERTION PROCEDURE OF SERVICE MANUAL

IMPORTANT SAFETY NOTICES

PREVENTION OF PHYSICAL INJURY

HEALTH SAFETY CONDITIONS

OBSERVANCE OF ELECTRICAL SAFETY STANDARDS

SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL

TABLE OF CONTENTS

ROLL FEEDER UNIT (B435/B436)

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

1.2 PAPER PATH

1.4 MECHANICAL COMPONENTS

1.6 ELECTRICAL COMPONENTS

2. DETAILED SECTION DESCRIPTIONS

2.3 EXPOSURE

2.3.2 PAPER AND ORIGINAL FEED (B048 ONLY)

Original Positioning

Scanning

Start Key Enable

2.4 DEVELOPMENT

2.4.4 TONER DENSITY CONTROL

Recovery from Toner End Condition

2.6 CLEANING

2.6.2 USED TONER COLLECTION

2.8 FUSING AND PAPER EXIT

2.8.1 OVERVIEW

2.8.3 TEMPERATURE CONTROL

Hot Roller Temperature Control

2.10 ENERGY STAR COMPLIANT MACHINES (ALL THE DESTINATION)

3. INSTALLATION

3.1 INSTALLATION REQUIREMENTS

3.1.1 ENVIRONMENT

3.1.2 MINIMUM SPACE REQUIREMENTS

3.1.3 MACHINE LEVEL

3.1.4 POWER SOURCE

3.2 INSTALLATION PROCEDURE

3.2.1 COPIER

Accessory Check