Ricoh FT 6645 Diagram

FT6645/6655/6665

SERVICE TRAINING

MANUAL

SECTION 1

OVERALL MACHINE

INFORMATION

1. SPECIFICATION

Configuration: Console Copy Process: Dry electrostatic transf er 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%

Full Size 100% 100%

Reduction 93%

82% 75% 71% 65% 50%

200% 155% 129% 121%

93% 85% 77% 74% 65% 50%

STM 1-1 FT6645/6655/6665

Rev. 7/94

Power Source: 115V, 60Hz, more than 20A (for N.A)

220 ∼ 240V, 50Hz/60Hz, more than 10A ( for EU and AA)

Power Consumptio n: FT6645(A095) and FT 6655 (A096) copiers

Copier only Full system* Warm-up 0.90 kVA 0.90 kVA Stand-by 0.25 kVA 0.25 kVA

Copying 1.20 kVA 1.30 kVA

Maximum 1.45 kVA 1.50 kVA

FT6665 (A097) copier

Copier only Full system*

120 V

machine Warm-up 1.20 kVA 1.20 kVA 1.25 kVA 1.25 kVA Stand-by 0.25 kVA 0.22 kVA 0.25 kVA 0.24 kVA

Copying 1.80 kVA 1.70 kVA 1.80 kVA 1.75 kVA

Maximum 1.80 kVA 1.70 kVA 1.80 kVA 1.75 kVA

230 V

machine

120 V

machine

230 V

machine

*Full System:

• Mainframe with dual job feeder, compact

sorter stapler and 3,50 0-sheet large capacity tray

• Mainframe with dual job feeder, floor type

sorter stapler and 3,50 0-sheet large capacity tray

• Mainfra me with recir culatin g document

handler, finisher and 3,500-sheet large capacity tray

FT6645/6655/6665 1-2 STM

Noise Emission:

Rev. 7/94

Sound Pressure Leve l: The meas ure ments are made according to ISO7779

Copying (FT6645/6655 copiers) 55 dB (A) 62 dB (A) Copying (FT6665 copier) 60 dB (A) 64 dB (A)

Copier only Full system*

Full System:

• Mainframe with dual job feeder, compact

sorter stapler and 3,50 0-sheet large capacity tray

• Mainframe with dual job feeder, floor type

sorter stapler and 3,50 0-sheet large capacity tray

• Mainfra me with recir culatin g document

handler, finisher and 3,500-sheet large capacity tray

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) FT6645 (A095) copier: Approximately (333 lbs) FT6655 (A096) copier: Approximately (360 lbs) FT6665 (A097) copier: Approximately (360 lbs)

Zoom: From 50% to 200% in 1% steps Copying Speed:

A4/LT (sideways) A3/DLT B4/LG FT6645 copier 45 23 27 FT6655 copier 55 28 35 FT6665 copier 65 33 41

Warm-up Time: Less than 5 minutes (20°C) First Copy Time:

(A4/81/2" x 11" sideways

3.1 seconds FT6645/6 655 (A095 /A096 copier s)

2.7 seconds FT6665 (A097 copier)

from the 1st feed station) Copy Number Input: Number keys, 1 to 999 (count up or count down) Manual Image Density 7 steps

Selection:

STM 1-3 FT6645/6655/6665

Rev. 7/94

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/side,

1000 total

• Large capacity tray: approximately 1,500

sheets

• Duplex: 50 sheets

Toner Replenishment: Black Only: Cartridge exchan ge

1,100 g/cartridge, Yield 38,000 copies (6% originals)

Developer Replenishment:

Black Only: 1Kg/Bag, 120,000 copies (6% originals)

Optional Equipment: • Type 610, Platen cover

• DF60, Dual job feeder

• DH400, Recirculating document handler

• ST25, 20 bin sorter stapler (Floor type)

• ST24, 20 bin compact sorter stapler

• SR400, Finisher

• RT31, 3,500-sheet Large capacity tray

• Type B, Receiving Tray

Toner Collection

7,500cc, 120,000 copies (6% origin als)

Bottle Capacity:

FT6645/6655/6665 1-4 STM

2. MACHINE CONFIGURATION

2.1 COPIER OVERVIEW

There are two types of mainframe.

FT6645 (A095) copier

Rev. 7/94

550 550

550

FT6655 (A096) FT6665 (A097) copiers

500 x 2 or 500 550

1,500

(3,500)

Three 550-shee t paper trays Optiona l 3,500-sheet larg e capacity t ray

Tandem pape r tray (including two 500-sheet paper tray) One 550-sheet paper tray 1,500-sheet built-in large capacity tray Optional 3,500-sheet large capacity tray

STM 1-5 FT6645/6655/6665

Rev. 7/94

2.2 SYSTEM OVERVIEW

System A

The mainframe FT6645 (A095) with dual job feeder and compact sorter stapler.

Compact sorter stapler ST24 (A374)

Dual job feeder DF60 (A376)

3,500-sheet s large capacity tray RT31 (A38 0)

System B

Mainframe type FT6645/6655/66 65( A0 95/A09 6/A097) with dual job feeder and floor type sorter stapler. The mainframe in the illustration below is the FT6655 (A096).

Floor type sorter stapler ST25 (A377)

Dual job feeder DF60 (A376)

3,500-sheets large capacity tray RT31(A380)

FT6645/6655/6665 1-6 STM

System C

The mainframe FT6665/6665 (A096/A097) with recirculating document handler and finisher.

Recirculating document handler DH400 (A378)

Finisher SR400 (A379)

Rev. 10/94

3,500-sheets large capacity tray RT31 (A38 0)

NOTE: All references to (A096 copier only) now refers to (A096 and

A097 copiers).

STM 1-7 FT6645/6655/6665

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 propor tional 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 prod ucing an electr ical lat ent imag e on the drum surface.

The amount of charge remaining as a latent image on the drum depends on the exposure lamp intensity contr olled 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 area s dissipa tes.

FT6645/6655/6665 1-8 STM

5. DRUM POTENTIAL SENSOR

The drum potential sensor detects the electr ical poten tial o n the drum to compensate image pro cessing elements.

6. DEVELOPMENT Positively charged toner is attracted to the negatively charged areas of the drum, thus developing the laten t image. (The positive triboele ctric char ge of the toner is caused by friction between the carrier and toner particles.)

The development bias voltage applied to the development roller shafts controls two things:

1) The "breakaway" level at which toner is attracted to the drum and at which toner remains on the developm ent rollers.

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 fro m the exposed areas of the drum. This makes imag e transf er 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 particle s from the dru m surface onto the copy paper. At the same time, the copy paper is electrica lly 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 neut ralizes the charge potential of the drum surface.

STM 1-9 FT6645/6655/6665

4. MECHANICAL COMPONENT LAYOUT

14 15 16

19 20

22 23

FT6645/6655/6665 1-10 STM

1. 3rd Mirror

2. 2nd Mirror

3. 1st Mirror

4. Exposure Lamp

5. Lens

6. Cleaning Brush

7. Cleaning Blade

8. Quenching Lamp

9. Charge Corona Unit

10. OPC Drum

11. 6th Mirror

12. 4th Mirror

13. 5th Mirror

21. Separation Roller, Bypass

22. Registration Rollers

23. Transfer Belt

24. Vertical Transport Roller s

25. Tandem Tray (A096 copier) 550-sheet Tray (A095 copier)

26. Universal Tray

27. 1500-sheet LCT (A096 copier) 550-sheet Tray (A095 copier)

28. Toner Collection Bottle

29. Transfer Belt Cleaning Blade

30. Hot Roller

31. Pressure Roller

32. Jogger Fences

14. Erase Unit

15. Drum Potential Sensor

16. Toner Hopper

17. Development Unit

18. Pre-Transfer Lamp

19. Pick-up Roller, Bypass

20. Feed Roller, Bypass

33. Duplex Positioning Roller

34. Duplex Pick-up Roller

35. Duplex Feed Roller

36. Separation Belt

37. Junction Gate

38. Exit Rollers

39. Optics Cooling Fan

STM 1-11 FT6645/6655/6665

5. DRIVE LAYOUT

❶

❽

❼

❻

❺

❾

❷

❸

❹

❶ Main Motor ❷ Scanner Drive Motor ❸ Fusing/Duplex Drive Motor ❹ Paper Feed Motor ❺ Toner Collection Motor ❻ Registration Clutch ❼ By-Pass Feed Motor ❽ BY-Pass Feed Clutch ❾ Development Drive Motor

1. OPC Drum

2. Scanner Unit

3. Transfer Belt Unit

4. Paper Exit Unit

5. Fusing Unit

6. Duplex Unit

7. Paper Trays

8. Paper Feed Units

9. Toner Hopper

10. Development Unit

11. Cleaning Unit

FT6645/6655/6665 1-12 STM

6. PAPER PATH

6.1 STANDARD COPYING

[E]

[F]

[D]

[C]

[B]

[A]

Paper feed begins from the exterior LCT, by-pass feed table or paper feed stations in the paper tray unit. The copy paper then follows one of two paths inside the copier. The path followed depen ds on which mode the opera tor has selected. For copy processing, all sheets follow the same path s from the paper feed mechanism [A] thro ugh the reg istra tion rollers [B], transfer belt [C], and fusing unit [D]. After that, copies are delivered to the sorter bins [E] or proof tray [F], however , 2 sided copies are diverted for furth er processing.

STM 1-13 FT6645/6655/6665

6.2 MULTIPLE 2-SIDED COPYING

a. Front Side

[B]

[A]

[D]

[C]

b. Rear Side

In this mode the junction gate [A] directs sheets exiting the fusing unit to the duplex tray entrance. After that, all sheets follow the path through the duplex entrance rollers [B].

After all front side copying is completed, the sheets on the duplex tray are fed in order from the bottom to the top and follow the path throug h the duplex feed mechanism and vertical tra nspor t rollers [C] to the registration rolle rs [D]. After that, these sheets follow the same path as standard copying from the registration rollers to the sorter.

FT6645/6655/6665 1-14 STM

7. ELECTRICAL COMPONENT DESCRIPTION

Refer to the electrical component layout on the reverse side of the Point to Point for symbols and index numbers.

NOTE: For RT31 description s, see Section 7, page 3

Symbol Name Function Index

No.

Motors

M 1 Scanner Drive Drives the 1st and 2nd scanners

(dc servo).

M 2 Exhaust Fan Rem oves the heat from around

the fusing unit. M 3 Main Drives the main unit components. 44 M 4 Development Drive Drives the development unit. 45 M 5 By-pass Feed Drives the by-pass feed rollers. 46 M 6 3rd Scanner Drive Drives the 3rd scanner (dc

stepper) M 7 Toner Bottle Drive Rotates the toner bottle to supply

toner to the toner hopper. M 8 Charge Wire Cleaner

Drive

M 9 Jogger Drives the jogger fences to

M10 Lens Horizontal Drive Shifts the lens horizontal position. 51 M11 Lens Vertical Drive Shifts the lens vertica l position. 52

Drives the main charge wire

cleaner to clean the charge wire.

square the paper stack in the

duplex tray (dc stepper).

M12 Optic Cooling Fan Removes heat from the optics

unit. M13 Fusing/Duplex Drive Drives the fusing unit, the duplex

unit, and the paper exit rollers. M14 Paper Feed Drives all feed and transport

rollers in the paper tray unit. M15 1st Lift Raises the bottom plate in the 1st

paper tray. M16 2nd Lift Raises the bottom plate in the

2nd paper tray. M17 Toner Collection Transports the collected toner to

the toner collection bottle.

STM 1-15 FT6645/6655/6665

Rev. 7/94

Symbol Name Function Index

No.

M18 3rd Lift

(A095)

M19 Side Fence Drive

(A096/A097)

Raises the bottom plate in the 3rd

paper tray.

Opens and closes the front and

the rear side fences of the

tandem tray. M20 Rear Fence Drive

(A096/A097)

Moves the papers stacked in the

left tandem tray to the right

tandem tray. M21 LCT Motor

(A096/A097)

Lifts and lowers the LCT bottom

plate to bring paper to the feed

position and allow loading of the

paper.

Magnetic Clutches

MC1 Toner Supply Turns the toner supply roller to

supply toner to the development

unit.

MC2 Registration Drives the registration rollers. 58

127

MC3 By-pass Feed Starts paper feed from the

by-pass feed table.

MC4 Duplex Transport Drives the duplex transport rollers

to transport the paper to the

vertical transport rollers.

MC5 Duplex Feed Starts paper feed from the duplex

tray to the duplex transport rollers.

MC6 1st Feed Starts paper feed from the 1st

feed tray.

MC7 2nd Feed Starts paper feed from the 2nd

feed tray.

MC8 3rd Feed Starts paper feed from the 3rd

feed tray.

101

104

FT6645/6655/6665 1-16 STM

Rev. 7/94

Symbol Name Function Index

No.

Switches

SW1 By-pass Table Detects if the by-pass feed table

is open or closed.

SW2 Front Door Safety Cuts the DC power line and

29 detects if the front door is open or not.

SW3 1st Tray Set

Detects if the 1st tray is set or not. 66

(A095)

SW4 2nd Paper Size Determines what size paper is in

67 the 2nd (universal) paper tray.

SW5 Toner Overflow Detects when the toner collection

75 bottle is full.

SW6 Toner Collection

Bottle Set

SW7 Lower Front Door

Safety

SW8 3rd Tray Set

Detects if the toner collection

77 bottle is set or not.

Detects if the front door is open

83 or not.

Detects if the 3rd tray is set or not. 84

(A095)

SW9 Main Provides power to the copier 122

SW10 Tray Down

Lowers the LCT bottom plate. 126

(A096/A097)

Solenoids

SOL 1 Junction Gate Moves the junction gate to direct

copies to the duplex tray or to the paper exit.

SOL 2 Duplex Positioning Controls the up- down move men t

of the positioning roller.

SOL 3 By-pass Pick-up Controls the up-down movemen t

of the pick-up roller for by-pass feed.

SOL 4 Guide Plate Opens the guide plate when a

paper misfeed occurs aro und this area.

SOL 5 Transfer Belt

Positioning

Controls the up-down move ment of the transfer belt unit.

STM 1-17 FT6645/6655/6665

Symbol Name Function Index

No.

SOL 6 Pressure Arm Presses the paper on the duplex

tray against the duplex feed rollers.

SOL 7 Tandem Lock Locks the left tandem feed tray

and separates the right and left tandem trays.

SOL 8 1st Pick-up Controls the up-down move ment

of the pick-up roller in the 1st feed station.

SOL 9 1st Separation Roller Controls the up-down movement

of the separation roller in the 1st feed station.

SOL10 2nd Pick-up Controls the up-down movement

of the pick-up roller in the 2nd feed station.

SOL11 2nd Separation Roller Controls the up-down movemen t

of the separation roller in the 2nd feed station.

SOL12 3rd Pick-up Controls the up-down move ment

of the pick-up roller in the 3rd feed station.

100

102

103

105

SOL13 3rd Separation Roller Controls the up-down move ment

of the separation roller in the 3rd feed station.

Sensors

S 1 Scanner HP Informs the CPU when the 1st

and 2nd scanners are at the home position.

S 2 Platen Cover

Position–1

Informs the CPU that the platen cover is in the up or down position (related to APS/ARE function).

S 3 Platen Cover

Position–2

Informs the CPU that the platen cover is in the up or down position to detect if the original has been removed or not.

106

FT6645/6655/6665 1-18 STM

Rev. 12/93

Symbol Name Function Index

No.

S 4 Lens Vertical HP Informs the CPU that the lens is

at the full-size position.

S 5 Lens Horizontal HP Informs the CPU that the lens is

at the horizontal home position .

S 6 3rd Scanner HP Informs the CPU when the 3rd

scanner is at the home position.

S 7 By-Pass Paper End Informs the CPU that there is no

paper in the by-pass feed table.

S 8 Guide Plate Position Informs the CPU if the

registration guide plate is closed or not.

S 9 Jogger HP Detects if the duplex jogger

fences are at the home position or not.

S10 Vertical Transport Detects the leading edge of the

paper to determine the paper feed timing of the next sheet.

S11 Duplex Exit Dete cts the leading edge of the

paper to determine the duplex transport clutch on timing .

S12 Duplex Entrance

Sensor

Detects the leading edge of the paper to determine the duplex

14 feed clutch off timing.

S13 Duplex Paper End Detects paper in the duplex tray. 13 S14 Duplex Transport Detects the leading edge of the

12 paper to control the jogger motor and the positioning solenoid on timing.

S15 Exit Detects misfeeds. 15 S16 Fusing Exit Detects misfeeds. 16 S17 Paper Guide Detects misfeeds. 17 S18 Auto Image Density Senses the background density

20 of the original.

S19 Original Length–2 Detects original length. 21 S20 Original Length–1 Detects original length. 22 S21 Original Width Detects original width. 23

STM 1-19 FT6645/6655/6665

Symbol Name Function Index

No.

S22 By-Pass Paper Size Informs the CPU what size paper

26 is in the by-pass feed table.

S23 Toner Density Senses the amount of toner in

27 the black developer.

S24 Registration Detects misfeeds and controls

28 registration clutch off-on timing.

S25 Toner End Detects toner end condition. 30 S26 Auto-Respon se Returns the display from the

34 screen saver.

S27 Drum Potential Detects the drum surface

39 potential.

S28 Image Density Detects the density of the ID

41 sensor pattern on the drum.

S29 1st Paper End Informs the CPU when the 1st

68 cassette runs out of paper.

S30 1st Paper Near End Informs the CPU when the 1st

69 cassette is in near end condition.

S31 1st Paper Feed Controls the 1st paper feed clutch

70 off/on timing and the 1st pick-up solenoid off timing.

S32 2nd Paper Near End Informs the CPU when the 2nd

cassette is in near end condition.

S33 1st Lift Detects the correct feed height of

the 1st cassette.

S34 2nd Paper End Informs the CPU when the 2nd

cassette runs out of paper.

S35 Toner Collection

Motor

Detects the toner collection motor operation.

S36 2nd Lift Detects the correct feed height of

the 2nd cassette.

S37 3rd Lift Detects the correct feed height of

the 3rd cassette.

S38 3rd Paper Near End

(A095 copier only)

Informs the CPU when the 3rd cassette is in near end condition.

S39 3rd Paper End Informs the CPU when the 3rd

cassette runs out of paper.

FT6645/6655/6665 1-20 STM

Rev. 7/94

Symbol Name Function Index

No.

S40 3rd Paper Feed Cont rols the 3rd paper feed

clutch off/on timing and the 3rd pick-up solenoid off timing.

S41 2nd Paper Feed Controls the 2nd paper feed

clutch off/on timing and the 2nd pick-up solenoid off timing.

S42 Base Plate Down

(A096/A097)

Detects when the bottom plate is completely lowered to stop the 1st lift motor.

S43 Side Fence

Positioning

Informs the CPU when the tandem tray side fences are open.

(A096/A097)

S44 Rear Fence Return

(A096/A097)

Informs the CPU when the tandem tray rear fence is in the return position.

S45 Rear Fence HP

(A096/A097)

Informs the CPU when the tandem tray rear fence is in the home position.

S46 Left Tandem Paper

End

Informs the CPU when the left tandem tray runs out of paper.

(A096/A097)

S47 LCT Near End

(A096/A097)

S48 Tray Down

(A096/A097)

Detects the paper near end condition.

Detects when the tray is completely lowered to stop the LCT motor.

S49 Tray Paper Set

(A096/A097)

Informs the CPU when the paper is set on the LCT bottom tray.

PCBs

PCB 1 AC Drive Provides AC power to the

exposure lamp and fusing lamp.

PCB 2 Main Controls all machine functions. 109 PCB 3 Optic Control Controls all optics components. 110 PCB 4 High Voltage Control Controls the output of both power

packs and development bias.

123

124

125

108

111

STM 1-21 FT6645/6655/6665

Rev. 7/94

Symbol Name Function Index

No.

PCB 5 Paper Feed Control Controls all components in the

paper bank.

PCB 6 DC Power Supply

Provides DC power. 113

Unit PCB 7 Guidance Controls the guidance display. 120 PCB 8 Operation Panel Controls the LED matrix, and

monitors the key matrix.

Lamps

L1 Exposure Applies high intensity light to the

original for exposure . L2 Fusing (2 in A097) Provides heat to the hot roller. 32 L3 Quenching Neutralizes any charge remaining

on the drum surface after

cleaning. L4 Erase Discharges the drum outside the

image area. L5 Pre-transfer Reduces the charge on the drum

surface before tra nsfer.

112

121

Power Packs

PP1 Transfer Provides high voltage for the

transfer belt and controls the

transfer belt positioning solenoid.

PP2 Charge Provides high voltage for the

charge corona wires, and the grid

plate. Controls QL, PTL, and

charge wire cleaner moto r

functions.

Others

TS1 Optics Thermoswitch Opens the exposure lamp circuit

if the optics unit overheats.

TF1 Fusing Thermofuse Opens the fusing lamp circuit if

the fusing unit overheats.

117

119

FT6645/6655/6665 1-22 STM

Rev. 10/94

Symbol Name Function Index

No.

TH1 Fusing Thermistor Senses the temperatur e of the

hot roller.

TH2 Optics Thermistor Monitors the temperature of the

optics cavity.

TH3 Drum Thermistor

(Located on the ID

Monitors the temperature of the

OPC drum.

Sensor Ass’y)

H1 Transfer

Anti-Condensation

Turns on when the main switch is

off to prevent moisture from

forming on the transfer belt.

H2 Optics

Anti-Condensation

Turns on when the main switch is

off to prevent moisture from

forming on the optics.

RA1 Main Power Relay Controls main power. 107

CO1 Total Counter Keeps track of the total number

114

of copies made.

NF1 Noise Filter Removes electrical noise. 115 CB1 Circuit Breaker Provides back-up high current

116 protection for the electr ical components.

LA1 Lightening Arrestor Removes current surges from the

118 AC input lines.

FT6665 (A097) copier only (unique items)

Symbol Name Function Index

No.

Motors

M22 AC Drive Cooling

Fan

Removes heat from around the AC drive unit.

141

M23 Optic Cooling Fan-2 Removes heat from the optic unit. 142 M24 Duplex Cooling Fan Cools the paper on the duplex

143

tray to reduce the heat around the drum.

STM 1-23 FT6645/6655/6665

Rev. 12/93

8. AC AND DC POWER DISTRIBUTION

The above illustration shows how ac power (120V/220V~240V) from the wall outlet is supplied to each component. When the copier is plugged in and the main switch is turned off, ac power is supplied to the anti-condensation heaters. When the main switch is turned on, the ac power supply to the anti-condensatio n heater s is cut off and ac power is supplied to the ac drive board. The ac drive board supplies power to the exposure and fusing lamps without voltag e step down.

The ac power is also supplied to the dc power supply board via main switch. The dc power supply board converts the wall outlet ac power into +38, +24, +12, +5, -12 volt dc.

These dc voltage are supplied to each component via the main control board, paper feed control board, and high voltage control board.

The dc voltages for all the peripherals are supplie d th rou gh the main contr ol board.

FT6645/6655/6665 1-24 STM

This page intentionally left blank

STM 1-25 FT6645/6655/6665

Rev. 7/94

9. FT6665 (A097) COPIER UNIQUE POINTS

The following are the FT6665 (A097) copier’s main unique points compared with the other machines in the same series FT6645/6655 (A095, A096) copiers.

The copy speed of FT6665 copier is 65 CPM. To achieve this high copy speed, the paper transport and copy process speed were increased from 330 mm/sec FT6645/6655 copier to 430 mm/sec.

The paper tray and periphe ral config ura tion of the FT6 665 copier is exactly the same as the FT6655 copier.

FT6645/6655/6665 1-26 STM

Item Unit Description Reason

Rev. 7/94

Drive Motor Main Motor Due to higher paper transport and copy

1 2 3 4 5

Exterior Right Door Printed model name is different

Optics Exposure Lamp Exposure lamp wattage is changed. Refer

Paper Feed Separation Roller torque

8 9

Duplex Brush Roller Due to higher paper transport speed, roller

Fusing Pressure Springs Due to higher copy speed, the spring

Fans AC Drive Cooling Fan Due to higher lamp power, motor speed,

16 17

Fusing/Duplex Drive Motor

Development Drive Motor

Optics Fan Filter To keep the optics cool in spite of a longer

Optics Control Board ROM on the optics control board is

limiter

Positioning Roller Arm Due to higher copy speed, the arm is

Duplex Paper End Sensor Due to higher copy speed, the pressure

Fusing Lamp Due to higher copy speed, lamp wattage

Pressure Roller

Cleaning Roller

Oil Supply Roller Cleaning

Roller (not illustrated)

Optic Cooling Fan-2 Duplex Cooling Fan

process speed

to STM page 2-31.

exposure lamp on time, a thinner filter is used.

different due to higher scanner motor speed.

Due to higher paper feed speed, torque limit is increased.

diameter is decreased (A095/A096 copier: 40mm, A097 copier: 25mm).

moved more frequently. Therefore, lighter arm is used.

arm moves more frequently. To ensur e the paper end detection, the detection mechanism on the pressure arm is replaced with reflective photo sensor.

tension is increased to maintain sufficient fusing ability.

is increased. (120V machine has two fusing lamps.)

Due to higher copy speed, higher cleaning ability is required. So, the contact pressure between the pressure roller and the cleaning roller was increased. To facilitate servicing, the cleaning roller can be replaced. (Cleaning roller unit is replaced for A095/A096 copiers.)

Due to the higher fusing roller rotation speed, the oil supply roller tends to collect foreign material. Thus, a cleaning roller has been added.

etc. the machine generates more heat. Therefore, three new fans are added.

STM 1-27 FT6645/6655/6665

Rev. 10/94

Item Unit Description Reason

19 20

Others DC Power Supply Unit

(120V machine only)

DC Harness Connectors for new fans are added.

Paper Guides To ensure the correct paper trans port, the

AC Drive Board Since one fusing lamp was added, the AC

Since fans are added and motor speed is increased, the DC power supply unit is improved.

guides are added.

Drive Board was modified. (120V machine only)

FT6645/6655/6665 1-28 STM

+ 232 hidden pages