Ricoh VT3500 S Service Manual VT3800

IMPORTANT SAFETY NOTICES

PREVENTION OF PHYS ICAL INJURY

1. Before disassembling or asse mblin g pa rts of the print er and pe riph erals, make sure that the power co rd is unp lug ge d.

2. The wall outlet should be near the copier an d easily accessible.

3. If any adjustment or operat ion 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.

HEALTH SAFETY CONDITIONS

1. If you get ink in your eyes by accide nt, try to remove it with eye drop s or flush with water as first aid. If unsuccessful, get medical attention.

2. If you ingest ink by accident, induce vomiting by sticking a finger down your throat or by giving soapy or strong salty water to drink.

OBSERVANCE OF ELECTRICAL SAFETY STANDARDS

1. The printer and its peripherals must be installed and mainta ine d by a customer service represent at ive who has comp leted the training course on those models.

CAUTION

The RAM board has a lithium battery which can explode if handle d incorrectly. Replace only with the same type of RAM board. Do not recharge or burn this battery . Use d RAM boar ds mus t be handled in accordance with local re gulations.

ATTENTION

La carte RAM comporte une pile au lithium qui présente un ris que d’explosion en cas de mauvaise manipulation. Remplacer la pile uniquement par une carte RAM identique. Ne pas rechar ger ni brûle r cette pile. Les cartes RAM usagées doivent être élimi née s conformément aux régle me ntati ons locales.

SAFETY AND ECOLOGICAL NOTES FOR DISP OS AL

1. Dispose of replaced parts in acco rda nce with local regulations.

2. Used ink and masters should be disp ose d of in an envionmentally safe manner and in accordance with local regulations.

3. When keeping used lithium batteries (fro m the main con tro l boa rds) in order to dispose of them later, do not store more than 100 bat te ries (from the main control boards) per sealed box. Sto ring larger numbers or not sealing them apart may lead to chemica l reactions and heat build-up.

SECTION 1

OVERALL MACHINE

INFORMATION

15 November 1995 SPECIFICATIONS

1. SPECIFICATIONS

Configuration: Table-top Master Processing: Digital Printing Process: Fully automatic one-drum stencil syste m Original Type: Sheet /B oo k Original Size: Maximum 307 mm x 432 mm (12.0" x 17.0") Reduction Ratios: Inch version:

93%, 77%, 74%, 65% Metric version: 93%, 87%, 82%, 71%

Enlargement Ratios: Inch version:

155%, 129%, 121% Metric Version:

141%, 122%, 115% Zoom: From 50% to 200% in 1% steps Directional Magnification: Vertical: From 50% to 200% in 1% steps

Horizontal: From 50% to 200% in 1% st eps Image Mode: Line, Photo, Line/Photo Color Printing: Drum unit replacement system

(Red, Blue, Green, Bro wn, Yello w, Pu rple ,

Navy, and Maroon) Master Feed/Eject: Roll master, automatic feed/eject Leading Edge Margin: 5 mm (0.2") Trailing Edge Margin: 3 mm (0.12") Printer Paper Size: Maximum 297 mm x 432 mm (11.6" x 17.0")

Minimum 90 mm x 148 mm (3.6" x 5.8") Printing Area: A3 drum

When using A3 paper:

More than 290 mm x 410 mm, 11.4" x 16.1"

When using 81/2" x 11" paper:

More than 290 mm x 415 mm, 11.4" x 16.3"

A4 drum

More than 290 mm x 204 mm, 11.4" x 8.0" Print Paper Weight: 47.1 g/m2 to 209.3 g/m2 (12.5 lb to 55.6 lb) Printing Speed: 60, 75, 90, 105, 120 sheets/minute (5 steps)

1-1

SPECIFICATIONS 15 November 1995

First Copy Time (Master Process Time):

Second Copy time (First Print Time):

Less than 23.5 seconds (A3, 11" x 17")

Less than 19.0 seconds (A4, 8

" x 11")

1/2

Less than 26.5 seconds (A3, 11" x 17")

Less than 21.5 seconds (A4, 81/2" x 11") Paper Feed Table Capacity: 1,000 shee ts (80 g/ m2, 20 lb) Paper Delivery Table

Capacity:

1,000 sheets (66.3 g/m2, 17.6 lb)

1,000 sheets (80g/m2, 20 lb) Power Source: 120 V, 50/60 Hz, 3.6 A (for N. America)

220/240 V, 50/60 Hz, 2. 0 A (for Europe, Asia) Power Consumption: 120 V, 50/60 Hz, 400 W (for N. America)

220/240 V, 50/60 Hz, 400 W (for Europe, Asia) Weight: 120 V version: 125 kg (275.5 lb)

220/240 V version: 125 kg (275.5 lb)

Cabinet: 23.5 kg (51.8 lb) Dimensions (W x D x H):

Width Depth Height

Stored 719 mm, 28.4" 698 mm, 27.5" 646 mm, 25.5" Stored with docu-

ment feeder Set up 719 mm, 28.4" 698 mm, 27.5" 644 mm, 25.4" Set up with cabinet 719 mm, 28.4" 698 mm, 27.5" 1,072 mm, 42.3" Set up with document

feeder Set up with cabinet

and document feeder

719 mm, 28.4" 698 mm, 27.5" 676 mm, 26.7"

1,331 mm, 52.5" 698 mm, 27.5" 666 mm, 26.3"

1,331 mm, 52.5" 698 mm, 27.5" 1,092 mm, 43.0"

Original Scanning Time: 2.5 ms/line Pixel Density: 400 dpi Master Eject Box Capacity: More than 50 masters under low temp era tu re

More than 60 masters at 23 °C, 73°F

More than 60 masters under high temperature Paper Separation: Friction roller/center separation system Feed Table Side Plate

88 mm to 336 mm (3.46" to 13.2") Movement:

Side Registration:

±10 mm Vertical Registration: More than +15 mm, –20 mm, +0.59", –0.79" Ink Supply: Automatic ink supply system Paper Delivery: Air knife/vacuum delivery

1-2

15 November 1995 SPECIFICATIONS

Print Counter: 7 digits Master Counter: 6 digits Supplies: Master Thermal master 320 mm width

370 masters/roll (with A4 drum) 226 masters/roll (with A3 drum) (VT-II L master)

Max. run length 2000 prints

Ink 1000 cc ink pack (black)

600 cc ink pack (Red, Blue, Green, Brown, Ye llow, Purple, Navy, Maroon)

1-3

GUIDE TO COMPONENTS 15 November 1995

2. GUIDE TO COMPONENTS

C223V501.wmf

1. Platen Cover

Lower this cover over an original before printing.

2. Original Holder

A convenient place for holding originals while operating the machine.

3. Original Table Release Lever

Use to open the original table unit when installing the master.

4. Feed Roller Pressure Lever

Use to adjust the contact pressure of the paper feed roller according to paper thickness.

5. Separation Roller Pressure

Levers

Use to adjust the separation roller pressure to prevent double feed.

6. Paper Feed Table

Set blank paper on this table for printing.

7. Paper Feed Side Plates

Use to prevent paper skew.

8. Side Plate Fine Adjustment Dial

Use to shift the paper feed table sideways

9. Paper Feed Table Down Key

Press to lower the paper feed table.

10. Front Door

Open for access to the inside of the machine.

1-4

15 November 1995 GUIDE TO COMPONENTS

1. Master Eject Unit Open Button

Press to remove misfed paper or a misfed master.

2. Master Cut Button

Press this button to cut the master paper leading edge after installing a new master roll.

3. Pressure Release Lever

Use to install the master roll.

C223V502.wmf

8. Ink Holder

Set the ink cartridge in this holder.

9. Paper Delivery Table

Completed prints are delivered here.

10. Small Size Paper Delivery End Plate

Use to align the leading edges of prints that are A4, 8 smaller.

1/2" x 11" or

4. Operation Panel

Operator controls and indicators are located here.

5. Drum Rotation Button

Press to replace the drum.

6. Drum Unit Lock Lever

Lift to unlock and pull out the drum unit.

7. Drum Unit

The master is wrapped around this unit.

11. Paper Delivery End Plate

Use to align the leading edges of prints larger than A4, 8

12. Paper Delivery Side Plates

Use to align the prints on the paper delivery table.

13. Master Eject Container Cover

Open when removing the master eject box.

14. Main Switch

Use to turn the power on or off.

1-5

1/2" x 11".

MECHANICAL COMPONENT LAYOUT 15 November 1995

3. MECHANICAL COMPONENT LAYOUT

25 24

1234

1820

141516

1. Drum Unit

2. Lens

3. CCD

4. Reverse Roller

5. Master Feed Roller

6. Platen Roller

7. Thermal Head

8. Master Roll

9. Master Making Unit

10. Upper Separation Roller

11. Paper Feed Roller

12. Paper Table

13. Separation Plate

14. Lower Separation Roller

C223V500-1.wmf

15. 2nd Feed Roller

16. Doctor Roller

17. Press Roller

18. Ink Roller

19. Paper Exit Pawl

20. Transpo rt Unit

21. Paper Delivery Table

22. Master Eject Box

23. 1st Eject Roller

24. 2nd Eject Roller

25. Master Eject Unit

26. Exposure Lamps

27. Original Exit Tray

1-6

201917

15 November 1995 DRIVE LAYOUT

4. DRIVE LAYOUT

5 6

15 14

1. Scanner Belt

2. Scanner Motor

3. Image Position Motor

4. Master Eject Motor

5. Drum Drive Gear

6. Drum Unit Gear

7. Drum Drive Pulley

8. Main Drive Belt

9. Transport Belt

10. Printing Pressure Pulle y

11. Printing Pressure Gear

C223V504.wmf

11 10

12. Idle Gear

13. Idle Pulley

14. Main Motor

15. Paper Table Drive Motor

16. Paper Feed Cam Gea r

17. Master Feed Motor

18. Timing Belt

19. Platen Roller Gear

20. Master Transport Roller Gear

21. Reverse Roller Gear

1-7

ELECTRICAL COMPONENT DESCRIPTIONS 15 November 1995

5. ELECTRICAL COMPONENT DESCRIPTIONS

INDEX

No.

Motors

15 Vacuum Fan Motor Provides suction so that paper is held firmly on the

37 Main Motor Drives paper feed, drum printing, and paper delivery

40 Paper Table Drive Motor Raises and lowers the paper feed table. 45 Image Positioning Motor Changing the relative timing of the paper feed roller

51 Master Feed Motor Feeds the master to the drum. 53 Master Buffer Fan Motor Provides suction so that the master is stored in the

54 Pressure Plate Motor Raises and lowers the pressure plate in the master

60 Air Knife Motor Drives the fan to separate the paper’s leading edge

62 Master Eject Motor Sends the used master into the master eject box. 64 Cutter Motor Drives the mechanism that cuts the master. 70 Scanner Motor Drives the 1st and 2nd scanners.

Solenoids

31 Ink Supply Solenoid Releases the spring clutch to activate the ink supply

32 Master Press Sheet Solenoid Inserts the mylar sheet between the press roller and

36 Printing Pressure Solenoid Engages the pressure on/off lever when a paper

39 Paper Feed Solenoid Releases the sector gears to feed the paper. 41 Detection Pin Release

Solenoid

46 Master Feed Clamper

Solenoid

47 Drum Lock Solenoid Prevents the drum unit from being removed during a

Master Eject Clamper Solenoid Open the master clamper to eject the master.

59 Master Eject Solenoid Presses the lower master eject roller against the

NAME FUNCTION

transport belt.

unit components.

and the drum to adjust the vertical image position.

master box during the master eject operation.

eject mechanism.

from the drum.

pump.

the drum during a quality start operation.

misfeed occurs.

Releases the detection pin arm to apply printing pressure during a quality start operation.

Open the master clamper to catch the master during master feed.

printing run.

drum surface.

Switches

1 Scanner Unit Safety Switch Cuts off the power line of the main and paper table

drive motors when the scanner unit is open.

2 Paper Table Down Button Instructs the CPU to turn on the paper table drive

motor to lower the paper table.

5 Paper Table Open Switch Checks whether the paper table is opened or not.

1-8

15 November 1995 ELECTRICAL COMPONENT DESCRIPTIONS

INDEX

No.

7 Paper Table Safety Switch Stops lowering the paper feed table to prevent users

12 Front Door Safety Switch Informs the CPU when the front door is open, and

18 Test Switch Disables the front door, paper table, master eject

20 Delivery Table Open Switch Checks whether the delivery table is open or not. 21 Main Switch Turns the power on or off. 22 Air Knife Motor Safety Switch Cuts off the power line of the air knife motor when

27 Drum Rotation Button Instructs the CPU to rotate the drum at 10 rpm. 28 Drum Unit Safety Switch Checks whether the drum unit is set correctly or not. 30 Master Eject Unit Safety

Switch

44 Master Cut Button Instructs the CPU to feed a short strip of master

52 Left Cutter Switch Detects when the cutter position is at the far left

61 Master Eject Box Switch Checks whether the master eject box is set properly. 66 Right Cutter Switch Detects when the cutter position is at the far right

76 ADF Set Switch Detects if the optional document feeder is closed.

NAME FUNCTION

from catching their fingers under it, by cutting the ac power. It also closes when the paper feed table is closed.

cuts off the power line to the paper table drive motor.

unit, and scanner unit safety switches.

the master eject unit is open.

Cuts off the power line when the master eject unit is open.

paper and cut the master paper.

(operation side).

(non-operation side).

Sensors

3 Paper End Sensor Informs the CPU if there is paper on the paper table. 4 Paper Width Sensors Informs the CPU of the printer paper width. 6 Paper Length Sensor Informs the CPU of the printer paper length. 8 Paper Table Height Sensor Informs the CPU if the paper table is at the paper

feed position.

11 Paper Table Lower Limit

Sensor

13 Printing Pressure Sensor Informs the CPU if printing pressure is applied. Also,

14 1st Paper Exit Sensor Detects paper misfeeds. 17 2nd Paper Exit Sensor Detects paper misfeeds. 33 2nd Drum Position Sensor Checks the position of the drum. 35 1st Drum Position Sensor Checks the position of the drum. 38 Drum Rotation Sensor Supplies timing pulses to the CPU based on the

49 Drum Master Sensor Informs the CPU if there is a master on the drum. 50 Master Buckle Sensor Informs the CPU if the master is buckling. 55 Lower Pressure Plate Sensor Informs the CPU if the pressure plate in the master

56 Upper Pressure Plate Sensor Informs the CPU if the pressure plate in the master

Informs the CPU if the paper table is at the lowest position.

detects paper misfeeds.

main motor speed.

eject mechanism is at the lower limit position.

eject mechanism is at the upper limit position.

1-9

ELECTRICAL COMPONENT DESCRIPTIONS 15 November 1995

INDEX

NAME FUNCTION

No.

57 Full Master Box Sensor Informs the CPU whether the master eject box is full

of masters or not. 58 Master Eject Sensor Detects used master misfeeds. 65 Master End Sensor Informs the CPU when the master roll in the master

making unit runs out. 68

Scanner Home Position Sensor Informs the CPU when the 1st scanner is at home

position. 72 Platen Cover Position Sensor Detects when the platen cover or the optional

document feeder is opened more than 25 degrees

above the exposure glass. 75 Original Sensor Detects if an original is placed on the exposure glass.

Printed Circuit Boards

9 Image Processing PCB Control the image processing performance.

29 Main Control PCB Controls all machine functions both directly and

through other boards. 42 AC Drive PCB Controls the ac components using relays. 43 Ink Detection PCB Informs whether ink is present in the drum. 71 CCD PCB Converts light intensity into an electrical signal. 74 A/D Conversion PCB Converts analog signals into digital signals.

Counters

23 Master Counter Keeps track of the total number of masters made. 24 Total Counter Keeps track of the total number of prints made.

Others

10 Transformer Steps down the wall voltage. 16 Power Supply Unit Provides power for all dc components. 19 Circuit Breaker Cuts the ac line off. 25 Operation Panel Interfaces the CPU and the operator. 26 Drum Rotation LED Turns to green from red when the drum stops at the

home position. 34 Noise Filter Filters out electrical noise from the ac power input

line. 63 Reverse Roller Clutch Transfers drive to the reverse roller. 67 Thermal Head Creates the master using heat. 69 Xenon Lamp Illuminates the original. 73 Xenon Lamp Stabilizer Stabilizes the power supplied to the xenon lamp.

1-10

Master Making/ Master Feed

15 November 1995 PRINTING PROCESS

6. PRINTING PROCESS

Master Ejection

Paper Delivery

1. Master Ejection/ Scanning/ Master Making:

At the start of the print ing run, the machine ejects the used master wrapped around the drum into the master eject box.

Scanning

Printing

Shown with optional ADF attached

Paper Feed

C223V500.wmf

At the same time, the machine scans the original on the exposure glass (reflected light goes to the CCD via the mirrors and the lens. The scanned image is tran sfe rred to the master using a thermal head.

While the old master is still being ejected, the new master is stored in a box.

2. Master Feed: After the old master has been ejected, the new master is fed to the drum and wrapped around it. At the same time, the master is cut of f fro m the roll.

3. Paper Feed: I nd ividu al she et s of pa per are fe d to the drum.

4. Printing: The paper fed from the paper fee d mechan ism is pressed onto the drum. This tra nsf ers ink to the printer paper through the drum screen and the master.

5. Paper Delivery: The exit pawl and air knife peel off the printo ut , and the printout is ejected onto the paper delivery table.

1-11

MAJOR DIFFERENCES BETWEEN THE C218 AND THE C223 MODELS 15 November 1995

7. MAJOR DIFFERENCES BETWEEN THE C218

AND THE C223 MODELS

The C223 model was develo pe d ba sed on the C218 model. The following table list s the major dif fe rences between the C223 and the

C218 models.

No. Item Remarks

1 Exposure Lamp The exposure lamp has been changed from a fluorescent

lamp to two xenon lamps.

2 Master Buffer

Mechanism

3 Quality Start A quality start mechanism has been added to minimize waste

4 Platen Roller Holding

Method

5 Leading Edge Margin The leading edge margin has been reduced from 8 mm to 5

6 Separation Roller

Shaft

7 Noise Reduction

Cover

8 Paper Size Sensors The paper size detection board has been eliminated. The

9 Optional Equipment The following items have been newly lined up as the options

The master process time has been reduced as a result of the new master buffer mechanism. The master making process starts at the same time as the master eject operation starts.

prints after a long idle interval. To ensure correct platen roller positioning, the platen roller is

held by two screws instead of two levers.

mm. The drum screens and printing pressure cam have been changed.

The diameter of the separation roller shaft has been increased. Due to this modification, the paper feed vibration noise has been reduced.

The noise reduction cover has been added to reduce paper feed noise.

paper size sensors directly send signals to the main control board.

for the C223 model: Sorter Stapler DS20A/DS20B DF II (50 sheets) Large Capacity Tray LT4000

10 Line/Photo Mode To allow clear prints of originals having line and photo areas,

Line/Photo mode has been added. Photo mode is processed using Error Diffusion, which is similar to the CAPIX method used in the C210 and C218 models.

11 Economy Mode If "Economy" mode is selected on the operation panel, a

lower thermal head energy is applied when a master is made. As a result, the image will be lighter than normal and ink consumption will be less.

12 CS Mode Customers can register three of seven frequently used user

SP modes in CS mode. The setting can be recalled using the CS mode key which is newly added.

13 Scanner Lock Lever To facilitate operation, the shape of the scanner lock lever

has been changed.

14 Paper Return

Mechanism

The paper return mechanism (a solenoid and a dc motor) has been eliminated.

1-12

15 November 1995MAJOR DIFFERENCES BETWEEN THE C218 AND THE C223 MODELS

No. Item Remarks

15 Cassette Size

Detection

16 Paper Feed Motor The paper feed motor has been changed from an ac motor to

17 Original Tray Cover To prevent the originals from dropping when the ADF is

18 Base Pads The shape of the base pads has been changed so that they

The cassette size detection board (red switch) has been eliminated. (The cassette has been changed from standard equipment to an option).

a dc motor.

opened, a cover has been added on the original tray.

can be used for both the normal table and the table for the LCT.

1-13

SECTION 2

DETAILED SECTION

DESCRIPTIONS

15 November 1995 MASTER EJECT

MASTER EJECT

1.1 OVERALL

At the end of the printing cycle, the use d master remains wrapped around the drum to prevent the ink on th e drum surface from drying. Whe n th e Master Making key is pressed to make a new master, the used master is ejected from the drum.

The master is pulled off the drum, th en it goes thro ug h the eje ct rollers and into the master eject box. A pressure plate then compacts the used master.

[D]

[G]

[C]

[A]

[F]

[B]

C223D505.wmf

[E]

Drum

•

The drum [B] rotates in reverse (opposite to the printing direction).

•

The master eject rollers [A] rotate.

•

The lower eject roller [C] is pressed against the drum.

•

The trailing edge of the master, which curls up from the drum, passes between the upper [E] and lower [F] eject rollers, and the master [D] is peeled off th e dru m and dumped into the mast er eje ct box [G].

C223D506.wmf

C223D507.wmf

[H]

[I]

•

The pressure plate [H] compa cts the ejected master [I].

2-1

MASTER EJECT 15 November 1995

1.2 MAS TER E JE CT ROLLE R ROTATI O N MECHANIS M

[A]

[B]

[E]

[J]

[I]

[F]

[B]

[G]

[C]

[D]

[H]

[E]

[F]

C223D511.img

When an original is in place and the Mast er Making key is pressed, the main motor starts turning at 22 rpm in re verse . As a resu lt, the drum also turns in reverse (compared with the rotation direct ion for prin ting).

At this time, if the drum master sensor detects a master on the drum, the master eject motor [A] starts rotating. Drive is transmitted to gear [E] and to the upper first eject rollers [G] through the timing belt [B] and gears [C] and [D]. Gear [F] drives the lower first eject rollers [H] . The belts [I] transmit drive from the first eject rollers to the upper and lower second eject rollers [J].

(If the drum master sensor d etects no master on the drum when the Master Making key is pressed, the mach ine skips t he master eject process and goes directly to the master making process.)

After the master eject process is co mple te d, the drum ret urns to its home position. The master eject rollers then stop rotating.

This model has four rollers on each eject roller shaft.

2-2

[D]

15 November 1995 MASTER EJECT

1.3 MASTER EJECT ROLLER DRIVE MECHANISM

[H]

[G]

[A]

[B]

[C]

[E]

C223D508.img

[F]

C223D510-1.img

The drum position is detected by th e first [G] and secon d [H] drum position sensors. When the drum reach es its ho me position, the first drum position sensor [G] is actuated by the int erru pt er [F] on the rea r sid e of the drum.

To eject the master, the drum turns in reverse (opposite to the printing direction). When the drum is 70° past the 1st dru m p osit ion sensor, the master eject solenoid [A] turns on and the suppo rte r [C] rotates counterclockwise on the upper eject roller shaft [D]. This forces the lower first eject roller [E] against the dru m.

As the drum turns, the curled trailing edge of the master [B] passes be twe en the upper and lower first eject rollers. The first eje ct rolle rs the n peel the master from the drum.

2-3

[C]

MASTER EJECT 15 November 1995

[A]

[D]

[B]

C223D509.img

When the drum is 109 degree past the 1st drum position sensor, the master eject solenoid [A] turn s off , sep ara ting the lower first eject rollers [C] from the drum.

Shortly after the lead ing edge of the ejected master h as passed between the upper and lower first eject rollers, the master eje ct sen sor [B ] is a ctiva ted. The master is then dumped int o the master eject box [D].

2-4

15 November 1995 MASTER EJECT

Print key on

First Drum Position Sensor

Master Eject Solenoid

Sensor ON Check

70°

Drum Rotation

Reverse Reverse

Master Eject Sensor

Master Eject Motor

Misfeed Indicator Lights

39° 18°

50° 50°

68°

Forward

C223D512.wmf

[Master Eject Misfeed Detection]

The misfeed indicator for the master eject section blinks in the fo llowing cases:

Case 1: The master eject sensor is not activa te d an d the drum has turned

50 degrees more (still in reverse and after de-activat ion of the master eject solenoid ). The machin e knows that the eject rollers have failed to catch the maste r. So the drum ret urn s 68 de gre es (in the printing direction) to rep ea t the mast er eject process once again. The master eject sole noid is a gain en erg ized while the drum turns another 18 degrees to try to catch the master.

If the master eject sen sor on ce again fails to detect the maste r, then the drum returns to its home position and the misf eed indicator blinks.

Case 2: The drum finishes its rotation for the master ejecting pro cess an d

returns to the home posit ion, but the master eject sen sor do es no t turn off. This means that the master is still in between the master eject rollers, the misfeed indicator blin ks.

2-5

[G]

MASTER EJECT 15 November 1995

1.4 MAS TER E JE CT CLAMPE R MECHANI S M

[F]

[B]

[A]

[E]

[C]

[D]

C223D513.img

When the drum has rotated 306° (in reverse) past the 1st drum position sensor, the master eje ct clamper solenoid [A] turns on and le ver [B ] moves counterclockwise a short way as shown . This move s the cam [D] inside the drum. Drum rotation brin gs th e clamp er sector gear [E] against the cam [D] . Gear [F] turns counterclockwise as it en ga ges the clamper sector gear, thus opening the master clamp er [G ]. This re lea ses th e master from the drum.

The drum keeps on turning until the interrupter at the rear of the drum has gone 13 degrees past the first drum posit ion sensor. Then, the main motor turns off. Half a second later, the master eject clamper solenoid [A] turns off and spring [C] pulls cam [D] back to its initia l posit ion . The drum then rotates forward to its home position .

2-6

[M]

[A]

[K]

[C]

[D]

[E]

[F]

[G]

15 November 1995 MASTER EJECT

1.5 P RESSURE PLATE UP/DOWN MECHANISM

[B]

[L]

[I]

[H]

[J]

Pressure Plate Down

C223D514.img

When the interrupter at the rear of the drum interrupts the first drum position sensor (this happens at th e en d of the master eject process), th e pre ssure plate motor [B] starts. This drives gear [H] clockwise by mea ns of gears [C], [D], [E], and [F].

Pin [I] on gear [H] moves link [G] down until the link interrupter [L] interrupts the lower pressure plate sensor [J] . Sp ring [M] pulls down on the pressure plate and the ejecte d master in the master eject box is compresse d by the pressure plate [A].

If the master box full sensor [K] does not turn on when the pressu re plate goes down, it means the master eje ct box is fille d with eject ed ma ste rs. In this case, the master eject bo x full ind icator blinks, and the machine stop s after a new master is wrapped around the drum.

The indicator goes out after the master eject box switch has been turned off and on. Then the maste r box full sensor is checked again afte r one ma ste r has been fed. This is to prevent the indicator from being reset without removing the ejected masters from the box. When the indicator is blinking, the Master Making key does not work, but the Print Start key and Proof key work so that the master curre nt ly o n th e dru m ca n be used for prin ting.

2-7

[B]

[D]

MASTER EJECT 15 November 1995

[A]

[G]

[C]

[F]

[E]

C223D515.img

Pressure Plate Up

When the master has been wrapped around the drum in the master makin g process and the master cutter leaves the home position to cut the master, the pressure plate moto r [B] starts rotating to ra ise th e pressure plate.

When the pressure plate moto r [ B] turn s, th e ge ar [C] is driven through the relay gears. The pin [F] on the gear inserted into the link [D] rises and lift s the left end of the link, thus raising the pressure plate.

The gear [C] continues turnin g until th e int erru pt er [G ] at the fron t en d of the pressure plate blocks the upper pressu re pla te sensor [A]. At this time, the master eject motor [B] stop s and the pressu re pla te is held in th e up pe r position.

Pressure Plate Motor Lock Detection

To prevent the pressure pla te motor from locking, "E-12" lig ht s up on the operation display panel under the following conditions:

1. When the lower pressure plate sen sor [E ] is not activa te d with in 8

seconds after the pre ssure plat e motor starts to lower the pressure plate.

2. When the upper pressure plat e sensor [A] is not activated with in 4

seconds after the pre ssure plat e motor starts to raise the pressure plate.

2-8

30 rpm 500 ms

70°

15 November 1995 MASTER EJECT

1.6 E LECTRI CAL TI MI NG

First Drum Position Sensor Second Drum Position Sensor

Main Motor Reversing

Main Motor Forwarding

Master Eject Motor Master Eject Solenoid Master Eject Clamper Solenoid

22 rpm

T1: When the Master Makin g key is

pressed, the main moto r a nd master eject motor start tu rnin g. At the same time, the paper table drive motor starts turning to lift the paper table to the paper feed position.

T2: When the drum ro ta tes X1 degrees

past the first drum position sensor actuation position (drum home position), the master eject solenoid is energized. This presses the lower eject rollers against the drum surface. The master eject solenoid is de-energized when th e dru m rotates X2 degrees more.

The drum rotation angles X1 and X2 depend on the drum type. This machine has two types of dru ms: one is the A3/DLT drum (standard), and the other is the A4/LT drum (optional). X1 and X2 for each drum are as follows

306°

13°

C223D516.wmf

0°

C223D612.wmf

0°

39°

C223D613.wmf

Drum Type A3/DLT A4/LT X1 (degree) 70 174 X2 (degree) 36 55

2-9

MASTER EJECT 15 November 1995

T3: When the drum rotates 306

degrees pas t the home posit i o n, the master eject clamper solenoid is energized.

T4: When the drum ro ta tes 13 degrees

past the drum home posit ion , the drum stops rotating.

500 milliseconds later (the drum completely stops during this period), the master eject clamper soleno id is de-energized and the drum starts rotating forward. The drum then returns to its home position. The master eject process is now over.

Soon after this, the mach ine starts feeding a new master and the drum starts rotating in reverse to begin the master making process.

0°

C223D614.wmf

0°

13°

C223D615.wmf

306°

2-10

15 November 1995 SCANNER

SCANNER

2.1 OVERALL

A book type scanner is used for the #C223 model. There are two modes for scanning originals. Platen Cover Mode: The original is placed on the exposure glass, and the scanner motor drives the scanner to scan the original. ADF Mode: When an optional Documen t Fee de r is inst alle d, the origin al is fed onto the exposure gla ss. The scann er move s 22 mm away from the CCD and remains still as it scans the original. The scanner comes back to the home position when the scanning is finished.

[G]

[F]

[E]

The light from the xenon lamps [A] is reflected from the orig ina l by the first [B], second [F], and third [E] mirrors t hro ug h th e len s [ D] to the CCD [C] .

[I]

[A]

[B]

[D]

[C]

C223D517.wmf

In the Platen Cover Mode , the CCD reads the white plate [G ] on the back of the original scale [I] each time be fo re scanning to obtain a standa rd white level. The standard white dat a are used to correct distortion. The scanner is at its home position when it rea ds th e white level.

In the ADF mode, as the scanner move s 22 mm, th e CCD read s the wh ite plate installed on the ADF.

2-11

SCANNER 15 November 1995

2.2 S CANNER ME CHANI SM

[B]

Front Side

[E]

[D]

[C]

[F]

Rear Side

[A]

[G]

C223D518.wmf

The scanner motor [A] (a stepper motor) drives the scanners. The first scanner [B], which consists of the expo sure lamp an d th e first mirror, is driven by the first scanner belt [F]. The seco nd scann er [C] , which consists of the second and third mirrors, is drive n by th e second scanner belt [D]. Both scanners move along the gu ide rails.

The timing belt [G] moves t he secon d scanner at half the speed of th e first scanner. This is to maintain the focal distance between the original and the lens during scanning.

The scanner home position is detected by the scanne r home position sensor [E]. In the Platen Cover Mod e, the sca nner scans the original on the exposure glass for the full A3 /DLT length, then retu rns un til th e scanner home position sensor is activat ed . In the ADF Mode , th e scan ne r moves 22 mm backwards (away from the CCD), to scan the origin al which is fe d by th e ADF. When the master making process is finished and the ADF motor st ops, the scann e r goes back to the home positi on.

2-12

15 November 1995 SCANNER

2.3 P LATEN CO VER POSITION DETECTION

[B]

[A]

C223D519.wmf

When the platen cover is opene d ab ou t 25 deg rees, the Platen Cover Position Sensor [A] is deactiva ted. When this sensor is deactivate d, the Original Sensor [B] is able to det ect the origin al on the expo sure glass.

When the Platen Cover Position Sensor is deactivat ed and the Origin al Sensor detects no original on the expo sure glass, the machin e indicates "SET THE ORIGINALS" on the operat ion displa y. This is t o pre ven t wast ing of the master that wo uld occur whe n the Master Making key is pressed with no original placed on the exposure glass.

When the original is placed on the expo sure glass and the Master Making key is pressed with the pla te n cover opened more than 25 degrees (a s the Platen Cover Position Senso r is deact ivat ed ), th e shadow erase function is enabled.

2-13

+ 254 hidden pages

Ricoh VT3500 S Service Manual VT3800

Specifications and Main Features

Frequently Asked Questions

User Manual