Ricoh FT6645 User manual

SECTION 1
OVERALL MACHINE
INFORMATION

1. SPECIFICATIONS
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"
Minimum A5/51/2" x 81/2" (Tray)
B5/81/2" x 11" (1.5K LCT)
A6/51/2" x 81/2" (By-pass)
Duplex Copying: Maximum A3/11" x 17"
Minimum A5/51/2" x 81/2" (sideways)
Copy Paper Weight: Paper tray: 52 ~ 128 g/m2, 14 ~ 34 lb
Bypass feed table: 52 ~ 157 g/m2, 14 ~ 42 lb
Duplex copying: 64 ~ 104 g/m2, 17 ~ 24 lb
Reproduction Ratios: 4 Enlargement and 6 Reduction
A4/A3 Version LT/LDG Version
Enlargement 200%
141%
122%
115%
200%
155%
129%
121%
Full Size 100% 100%
Reduction 93%
82%
75%
71%
65%
50%
93%
85%
77%
74%
65%
50%
Overall
Information
23 April 1993 SPECIFICATIONS
1-1

Power Source: 115V,60Hz,more than20A(for N.A)
220~ 240V, 50Hz/60Hz,more than10A(for EU
and AA)
Power Consumption:A095 and A096copiers
Copieronly Full system*
Warm-up 0.9 kVA 0.9 kVA
Stand-by 0.25 kVA 0.25 kVA
Copying 1.2 kVA 1.3 kVA
Maximum 1.45 kVA 1.5 kVA
*Full System:
•Mainframewith dual jobfeeder, compact
sorter stapler and3,500-sheetlargecapacity
tray
•Mainframewith dual jobfeeder, floor type
sorter stapler and3,500-sheetlargecapacity
tray
•Mainframe with recirculating document
handler,finisher and 3,500-sheet large
capacity tray
Noise Emission:
Copieronly Full system*
Copying 55 dB (A) 61 dB (A)
Full System:
•Mainframewith dual jobfeeder, compact
sorter stapler and3,500-sheetlargecapacity
tray
•Mainframewith dual jobfeeder, floor type
sorter stapler and3,500-sheetlargecapacity
tray
•Mainframe with recirculating document
handler,finisher and 3,500-sheet large
capacity tray
Sound pressurelevel:
The measurements are
madeaccording
to ISO7779
SPECIFICATIONS 23 April 1993
1-2

Dimensions: 690 x 690 x 980 (W x D x H Mainframe only)
1280 x 690 x 1020 (W x D x H Mainframe with
copy tray, platen cover)
Weight: Copier only:(Without the optional platen cover
= Approximately 2 kg)
A095 copier: Approximately 151 kg
A096 copier: Approximately 163 kg
Zoom: From 50% to 200% in 1% steps
Copying Speed: A4/LT (sideways) A3/DLT B4/LG
A095 copier 45 23 27
A096 copier 55 28 35
Warm-up Time: Less than 5 minutes (20°C)
First Copy Time: 3.1 seconds (A4/81/2" x 11" sideways from the
1st feed station)
Copy Number Input: Number keys, 1 to 999 (count up or count down)
Manual Image Density
Selection: 7 steps
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 tray: approximately 500 sheets
•Large capacity tray: approximately 1500
sheets
Overall
Information
23 April 1993 SPECIFICATIONS
1-3

Toner Replenishment: 1,100 g/cartridge
Optional Equipment: •Platen cover
•Dual job feeder
•Recirculating document handler
•20 bin sorter stapler (Floor type)
•20 bin compact sorter stapler
•Finisher
•3500-sheet Large capacity tray
•Receiving Tray
SPECIFICATIONS 23 April 1993
1-4

2. MACHINE CONFIGURATION
2.1COPIER OVERVIEW
Thereare twotypes of mainframe.
A095copier
A096copier
550
550
550
(3,500)
(3,500)
500 x 2 or 500
550
1,500
Overall
Information
23 April 1993 MACHINE CONFIGURATION
1-5

2.2 SYSTEM OVERVIEW
System A
(The mainframe (A095) with dual job feeder and compact sorter stapler)
System B
(Mainframe type (A095/A096) with dual job feeder and floor type sorter
stapler. The mainframe in the illustration below is the A096.)
Compact
sorter stapler
(A374)
Dual job feeder (A376)
3,500-sheets
large capacity
tray (A380)
Dual job feeder (A376)
3,500-sheets
large capacity
tray (A380)
Floor type
sorter stapler
(A377)
MACHINE CONFIGURATION 23 April 1993
1-6

System C
(The mainframe (A096) with recirculating document handler and finisher)
3,500-sheets
large capacity
tray (A380)
Recirculating document handler (A378)
Finisher
(A379)
Overall
Information
23 April 1993 MACHINE CONFIGURATION
1-7

3. COPY PROCESS AROUND THE DRUM
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 resistance of drum in the illuminated
areas drops and the charge on those areas dissipates.
10
9
8
7
6
5
4
3
12
11
COPY PROCESS AROUND THE DRUM 23 April 1993
1-8

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.
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.
Overall
Information
23 April 1993 COPY PROCESS AROUND THE DRUM
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