Ricoh VT1800 Bedienungsanleitung

N810-II

SERVICE MANUAL

INTRODUCTION

This manual explains only the features of the N810-II (C225 model) that are

different compared with the N810 (C217 model). So, please refer to the N810

service manual for the sections which are not described in this manual.

SECTION 1

OVERALL MACHINE

INFORMATION

1. SPECIFICATIONS

Configuration: Desk top

Master Making Process: Digital

Printing Process: Full automatic one-drum stencil system

Image Mode: Line/Photo

Original Type: Sheet

Original Weight: 64 g/m2∼104.7 g/m2(17.0 lb ∼27.9 lb)

Original Size: Max: 216 mm x 356 mm (81/2" x 14")

(Legal Drum)

216 mm x 297 mm (81/2" x 11.7")

(A4 Drum)

Min: 90 mm x 140 mm (31/2" x 51/2")

Paper Size: Max: 216 mm x 356 mm (81/2" x 14")

(Legal Drum)

216 mm x 297 mm (81/2" x 11.7")

(A4 Drum)

Min: 90 mm x 140 mm (31/2" x 51/2")

Paper Weight: 52 g/m2∼150 g/m2(13.8 lb ∼39.9 lb)

Printing Area: LG drum: 210 mm x 349.6 mm

(8.3" x 13.8") or less

A4 drum: 210 mm x 291 mm

(8.3" x 11.5") or less

Printing Speed: 70/100/130 cpm (3 settings)

First Copy Time: 28 seconds ± 2 seconds (Legal Drum)

26 seconds ±2 seconds (A4 Drum)

Second Copy Time: 30 seconds ±2 seconds (Legal Drum)

28 seconds ±2 seconds (A4 Drum)

Leading Edge Margin: 5mm ±3 mm (0.2" ±0.12")

5 September 1995 SPECIFICATIONS

1-1

Trailing Edge Margin: 1 mm ±1 mm (0.04" ±0.04")

Paper Feed Table Capacity: 500 sheets (80 g/m2, 20.0 lb)

Paper Delivery Table Capacity: 500 sheets (80 g/m2, 20.0 lb)

Master Eject Box Capacity: More than 25 masters

ADF Original Capacity: 6 sheets or a 0.6 mm height

Weight: 55 kg (122 lb)

Power Source: 120 V, 60 Hz, more than 3.6 A (for North

America)

220 V ∼240 V, 50/60 Hz, more than 2.1 A

(for Europe, Asia)

Power Consumption: Master Making: Less than 0.22 kW

Printing: Less than 0.22 kW

Dimensions:

(W x D x H) [Tables stored]

692 mm x 612 mm x 440 mm

(26.2" x 24.1" x 17.3")

[Tables set up]

1050 mm x 612 mm x 440 mm

(41.3" x 24.1" x 17.3")

Pixel Density: 300 dpi

Print Counter: 7 digits

Master Counter: 6 digits

Noise Emission:

Printing Speed Operator position Bystander position

70 rpm less than 66 dB less than 64 dB

100 rpm less than 70 dB less than 68 dB

130 rpm less than 72 dB less than 71 dB

The measurements are to be made in accordance with ISO 7779.

SPECIFICATIONS 5 September 1995

1-2

Optional Equipment: Key Counter, Tape Dispenser

Consumables:

Name Size Remarks

Thermal master Length: 125 m (410 ft)/roll

Width: 240 mm (9.5") 260 masters can be made per roll

with a Legal Drum.

304 masters can be made per roll

with an A4 Drum.

Storage Conditions:

–10 ∼40°C, 10 ∼90% RH

Ink 600 cc/pack Storage Conditions:

–5 ∼40°C, 10 ∼90% RH

Tape for tape maker 35 m (114.8 ft)/roll

5 September 1995 SPECIFICATIONS

1-3

2. ESSENTIAL DIFFERENCES BETWEEN THE

C217 AND THE C225

No. Item Remarks

1 Paper Delivery System The paper delivery system has been changed from a

delivery roller system to a vacuum transport system. Due

to this modification, 5 mm side margins are not required

for originals.

2 Paper Table Set Switch A magnetic switch has been added to detect whether or

not the paper table is in the paper feed position. Indicator

"B" lights when the paper table is in the low position.

3 Thermal Head To minimize ink set-off, the shape of the thermal head

heating elements have been changed as shown below.

4 Paper Table Side

Fences For easy side fence positioning, a rack and pinion

mechanism has been installed. The left and right side

fences move together.

5 Master Eject Box To prevent the used master from drooping when the

customer takes out the master eject box, a master holder

has been added to the master eject box.

6 Paper Delivery Table The delivery end fence and the side fences can be folded

for storing in the delivery table.

7 Master Eject Box

Capacity The pressure for compacting the master in the master

eject box has been increased. The master eject box

capacity has been increased from 15 to 25 masters.

8 Economy Mode If Economy mode is selected, the thermal head energy is

reduced by 15% (this is done by changing the pulse

width). The image density will be slightly lighter, and ink

consumption will be less than normal.

C225V500.img

ESSENTIAL DIFFERENCES BETWEEN THE C217 AND THE C225 5 September 1995

1-4

No. Item Remarks

9 Exposure Glass Bracket To prevent the scanned original from being pushed out by

the next original, the shape of the exposure glass bracket

has been changed as shown below.

10 Original Feed Spring

Plate To ensure proper feeding of thin paper, the angle of the

original feed spring plate has been changed.

11 Paper Feed Timing To reduce noise which occurs when the paper hits the

2nd feed roller, the first paper feed length has been

reduced. (The buckle between the 1st and 2nd paper

feed rollers has been shortened.)

12 Skip Feed A user can select from 2 to 9 rotations of the drum while

one sheet of paper is fed.

13 A4 Size Drum (Only A4

machines) To minimize master consumption, the screen mesh length

and the master cut length of the Europe/Asia machines

has been shortened. (The master consumption of the

LT/LG machines is the same as for the C217.)

14 Quality Start The first print tends to be light. To increase the image

density of the first print, Quality Start mode can be

selected. In this mode, the first print is made at 30 rpm.

15 Image Processing in

the "Darker 2" setting In the C217 model, only the A/D conversion parameters

are changed when the image density setting is changed.

This does not change the density of solid black areas.

In the C225 model, if "Darker 2" is selected on the

operation panel, the thermal head energy is increased to

115% of the normal setting. The solid black areas will

become darker.

H225V501.wmf

5 September 1995 ESSENTIAL DIFFERENCES BETWEEN THE C217 AND THE C225

1-5

3. PRINTING PROCESS

1. Master Ejecting: The machine ejects the used master

wrapped around the drum into the master

eject box.

2. Scanning: The machine scans the original using the

CCD, through the mirror and the lens,

while feeding the original.

3. Master Feeding: The machine converts the signal from the

CCD into digital signals and sends them to

the thermal head to make holes in the

master. The master then wraps around

the drum.

4. Paper Feeding: The machine sends paper separately to

the drum.

5. Printing: The machine presses the paper fed from

the paper feed section against the drum.

This transfers the ink to the paper through

the drum screen and the master.

6. Paper Delivering: The machine peels off the printed paper

with the exit pawls and air knife, and

ejects the paper onto the paper delivery

table.

C225V502.img

PRINTING PROCESS 5 September 1995

1-6

4. MECHANICAL COMPONENT LAYOUT

1234

6789

1617181920212223

28 29

C225V502-2.img

1. Mirror

2. Original Feed Roller

3. Original Pressure Plate

4. Exposure Lamp

5. Exposure Glass

6. Original Pick-up Roller

7. Original Friction Pad

8. Master Tension Roller

9. Platen Roller

10. Thermal Head

11. Master Roll

12. Platter Unit

13. Ink Pump

14. Paper Table

15. Paper Feed Roller

16. Friction Pad

17. 2nd Feed Roller

18. Doctor Roller

19. Press Roller

20. Ink Roller

21. Exit Pawl

22. Transport Unit

23. Paper Delivery Table

24. Drum

25. Master Eject Box

26. Master Eject Roller

27. CCD Unit

28. Original Exit Tray

29. Master Eject Unit

5 September 1995 MECHANICAL COMPONENT LAYOUT

1-7

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