Ricoh FW810 Service Manual

SECTION 1

OVERALL MACHINE INFORMATION

6 January 1990

1. SPECIFICATIONS

Configuration: Table top Copy Process: Electrostatic transfer system Original Feed: Sheet feed Original Size: Maximum: 914 x 3,600 mm

Minimum: 182 x 257 mm (B5 lengthwise) Copy Size: Same as "Original Size" Copying Speed: Manual feed: 5 cpm (A1/D sideways)

Tray feed: 6 cpm (A1/D sideways) First Copy: 22 seconds (A1 sideways) Warm-up Time: Within 7 minutes (Room temperature 20 Copy Counter: 1 to 9

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

to 1, 3, 4, or 5 minutes or to no auto reset) Photoconductor: Organic photoconductor drum Drum Charge: Single-wire with grid plate (Negative Charge) Reproduction Ratio: 1 : 1 (

±0.5%)

Exposure System: Slit exposure via fiber optic array Exposure Lamp: Fluorescent lamp (65 W) Development: Dual-component dry toner system Toner Replenishment: Cartridge system (750 g toner/cartridge) Toner Consumption: 1,600 A1 or D copies per cartridge (7% original) Development Bias: Negative Toner Density Control: Pattern density detection by photosensor and

direct toner density detection by induction

sensor Image Density Adjustment: Development bias control + exposure control +

grid voltage control Auto Image Density

Development bias control and exposure control Control:

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6 January 1990

Image Transfer: Single wire dc corona (negative charge) with

pre-transfer lamp Paper Separation: Dual wire ac corona and pick-off pawls Cleaning: Cleaning blade Quenching: Photo quenching by LEDs Paper Feeding: Manual feed (auto sheet feeder optional) Image Fusing: Heat and pressure type, teflon (upper) and

silicone rubber (lower) rollers Fusing Lamp: Halogen lamp (115 V: 1,100 W, 220/240 V:

1,100 W) Self-diagnostic Codes: 14 codes, displayed in copy counter

Power Source: 115 V/60 Hz....12 A

220 V/50 Hz....7 A

240 V/50 Hz....7 A

Power Consumption: Maximum: 1.4 kW

Warm-up: 1.2 kW

Ready: 0.1 to 1.2 kW

Copy cycle: 1.4 kW Ozone Output: Less than 0.1 ppm (1000 ft

at least 3 times per hour) Dimensions (W x D x H): 1,410 x 800 x 600 mm

55.51 x 31.50 x 23.62 in Weight: 180 kg, 397 lb Optional Equipment: ---- Automatic sheet feeder

---- Roll cutter

---- Paper spool

room, air turnover

1-2

2. OPERATOR CONTROLS

2.1 OPERATION PANEL

6 January 1990

15 16

1. Manual Image Density Indicators

Show the image density level selected by the Lighter and Darker keys.

2. Lighter Copy Indicator

There are 14 manual ID levels but only 7 manual ID LEDs. The Lighter Copy indicator lights when manual ID levels from 8 to 14 are selected.

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6 January 1990

3. Wait Indicator

Indicates that the machine is not ready to copy.

4. Select Paper Key

Press to select manual feed or the auto sheet feeder.

5. Ready Indicator

Lights when the machine is ready to make copies.

6. Auto Sheet Feed Indicator

Lights when the auto sheet feeder is selected.

7. Manual Feed Indicator

Lights when the manual paper feed mode is selected.

8. Add Paper Indicator

Lights when the auto sheet feeder runs out of paper.

9. Add Toner Indicator

Lights when it is time to install a new toner cartridge.

10. Original Misfeed Indicator

Lights if an original misfeeds within the copier.

11. Misfeed Indicator

Lights if paper misfeeds within the copier.

12. Close Unit Indicator

Indicates that one of the copier’s units is open. The copier will not operate until it is completely closed.

13. Toner Collection Bottle Indicator

Lights when it is time to empty the toner collection bottle.

15. Copy Counter

Displays the number of copies entered, the number of copies made, and service codes.

16. Copy Exit Way Key

Selects either upper or lower copy exit.

17. Lead Edge Erase Indicators

Shows the width of the leading edge erase margin.

18. Lead Edge Erase Key

Selects the amount of leading edge erase.

19. Clear Modes Key

Press to clear the copier of previously entered settings.

20. Clear/Stop Key

Press to cancel the copy number entered. While copying, press to stop copy operation.

21. Plus Key

Press to increase the number of copies to be made. (The maximum repeat copies is 9.)

22. Minus Key

Press to decrease the number of copies to be made.

23. Auto Image Density Indicator

Lights when the copier is automatically controlling the image density.

24. Auto Image Density Key

Press to enter and exit the auto image density mode.

25. Darker Key

Press to make copies darker

14. Call Service Indicator

Indicates that there are functional problems within the copier.

26. Lighter Key

Press to make copies lighter.

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2.2 INDICATOR PANEL

6 January 1990

1. Insert Original Indicator

Lights when the machine is ready for an original to be inserted. Turns off when an original is inserted.

2. Stop Key

Press to stop the copier during a copy cycle (emergency stop).

3. Insert Copy Paper Indicator

Lights when the machine is ready for a sheet of copy paper to be inserted. Turns off when a sheet of copy paper is inserted.

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6 January 1990

3. DRUM PROCESSES

1. Charge

In the dark the charge corona unit applies a negative charge to the drum. The grid plate ensures the charge is applied uniformly. The charge remains on the surface of the drum because the photoconductive drum has a high electrical resistance in the dark.

2. Exposure

High intensity light from a fluorescent lamp is reflected from the moving original through the fiber optic array. The charge on the drum surface is dissipated in direct proportion to the intensity of the reflected light, thus producing an electric latent image on the drum surface.

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6 January 1990

3. Development

The magnetic developer brush on the development roller comes in contact with the latent image on the drum surface. Toner particles are electrostatically attracted to the negatively charged latent image areas.

4. Pre-Transfer Lamp

The pre-transfer lamp illuminates the drum prior to image transfer. This reduces the attraction between the toner and the drum, thus making image transfer easier.

5. Image Transfer

Copy paper is fed to the drum surface at the proper time to align the copy paper and the developed image on the drum surface. Then a strong negative charge is applied to the back side of the paper. The negative charge pulls the toner particles from the drum surface onto the paper.

6. Paper Separation

A strong ac corona discharge is applied to the back side of the copy paper, reducing the charge on the paper and breaking the electrostatic attraction between the paper and the drum. Then, the stiffness of the copy paper causes it to separate from the drum. The pick-off pawls help to separate paper which has low stiffness.

7. Cleaning

The cleaning blade removes any toner remaining on the drum surface.

8. Quenching

The light from the quenching lamp electrically neutralizes the surface of the drum.

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6 January 1990

4. MECHANICAL COMPONENT LAYOUT

2 1

24 25

3940

1. 1st Feed Detector

2. 2nd Feed Detector

3. Toner Cartridge

4. 5th Press Roller

5. Original Recycle Gate

6. Original Set Detector

7. Front Original Feed Roller

8. 1st Press Rollers

9. Original Exit Detector

10. 1st Original Transport Detector

11. Exposure Lamp

12. Platen Roller

13. Fiber Optic Array

14. Charge Corona Unit

15. 2nd Original Transport Detector

16. Original Registration Rollers

17. 4th Press Rollers

18. 2nd Press Rollers

19. Rear Original Feed Roller

20. 3rd Press Rollers

21. Quenching Lamp

22. Upper Exit Rollers

23. Upper Exit Sensor

24. Exit Rollers

25. Exit Gate

26. Exit Detector

27. Lower Exit Sensor

28. Hot Roller

29. Pressure Roller

30. Transport Belt

31. Transport Sensor

32. Cleaning Unit

33. Pick-off Pawls

34. OPC Drum

35. T/S Corona Unit

36. Paper Registration Rollers

37. Pre-Transfer Lamp

38. Registration Sensor

39. Development Unit

40. Manual Feed Rollers

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5. DRIVE LAYOUT

6 January 1990

26 25

1. Original Drive Belt 2

2. Rear Original Feed Rollers

3. Original Drive Clutch

4. Main Drive Motor

5. Original Registration Rollers

6. Original Drive Belt 3

7. Platen Roller

8. Front Original Feed Rollers

9. Development Roller Gear

10. Auger Gear

11. Toner Supply Clutch

12. Development Motor

13. Paper Feed Clutch

14. Paper Feed Drive Chain

15. Development Drive Belt

16. Paddle Roller Gear

17. Registration Roller Clutch

18. Drum Drive Gear

19. Toner Collection Coil Gear

20. Feed/Fusing Drive Belt 2

1820

21. Fusing Drive Chain

22. Drum Drive Belt

23. Feed/Fusing Drive Belt 1

24. Transport Roller Sprocket

25. Hot Roller Sprocket

26. Lower Exit Roller Sprocket

27. Exit Roller Drive Chain

28. Upper Exit Roller Sprocket

29. Original Drive Belt 1

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6 January 1990

6. ELECTRICAL COMPONENT LAYOUT

6.1 MIDDLE AND UPPER SECTIONS

40 39

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6.2 LOWER AND FUSING SECTIONS

6 January 1990

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6 January 1990

1. Development Motor

2. Development Motor Capacitor

3. Charge/Bias PP

4. Lamp Regulator

5. Main Motor Capacitor

6. Light Sensor

7. Cooling Fan

8. Original Feed Clutch

9. Main Motor

10. Indicator Panel

11. 1st Original Transport Detector

12. Original Registration Sensor

13. 2nd Original Transport Detector

14. Auto Density Sensor

15. Upper Exit Sensor

16. Exit Sensor

17. Lower Exit Sensor

18. Pattern Shutter SOL

19. Upper Safety Switch

20. Rear Safety Switch

21. Exit Gate SOL

22. Pulse Generator

23. Exhaust Fan

24. Toner Overflow Sensor

25. Recycle Gate SOL

26. Main Board

27. Exposure Lamp

28. Recycle Gate Detector

29. Operation Panel

30. Pre-Transfer Lamp

31. ID Sensor

32. Pick-off Pawl SOL

33. Registration Sensor

34. 2nd Feed Detector

35. 1st Feed Detector

36. Toner Density Sensor

37. Paper Stopper SOL

38. Original Exit Detector

39. Original Set Detector

40. Original Stopper SOL

41. Quenching Lamp

42. Toner Cover SW

43. Toner Supply SOL

44. Manual Feed SOL

45. Registration SOL

46. Fusing Lamp

47. Transfer/Separation PP

48. DC Power Supply

49. Hot Roller Thermistor

50. AC Controller 2

51. AC Controller 1

52. Fusing Thermofuse (x2)

53. Pressure Roller Thermistor

54. Triac

55. Vacuum Fan

56. Circuit Breaker

57. Noise Filter

58. AC Terminal Block

59. Auto Feeder Safety Switch

60. Main Switch

61. Total Counter

62. Lower Safety Switch

63. Vacuum Fan Motor Capacitor

64. Transport Sensor

65. Anticondensation Heater

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6 January 1990

7. ELECTRICAL COMPONENT DESCRIPTIONS

SYMBOL NAME FUNCTION LOCATION

Motors

M1 Main Motor Drives all mechanical components

except the development unit and the fans. (100 Vac)

M2 Development

Motor

M3 Exhaust Fan

Motor

M4 Cooling Fan Mo-

tor

M5 Vacuum Fan Provides suction so that paper is held

Magnetic Clutches

MC1 Original Feed

Clutch

MC2 Registration

Clutch

Solenoids

Drives the development unit. (100 Vac) 1

Removes heat from around the fusing unit. (100 Vac)

Provides air flow to the optics cavity. (100 Vac)

firmly on the transport belts and rollers. (100 Vac)

Drives the original feed mechanism. 8

Drives the registration rollers. 45

SOL1 Toner Supply

Solenoid

SOL2 Pattern Shutter

Solenoid

SOL3 Exit Gate Sole-

noid

SOL4 Pick-off Pawl

Solenoid

SOL6 Paper Stopper

Solenoid

SOL7 Manual Feed

Solenoid

SOL8 Recycle Gate

Solenoid

Turns on to supply toner to the development unit.

On ID check cycles, this solenoid turns on to move the pattern plate into the light path.

Controls the position of the exit gate. (When ON, the paper exits downward; when OFF, the paper exits upward.)

Moves the pick-off pawls against the drum.

Moves the paper stopper down to prevent paper from being inserted.

Turns ON to engage the manual feed clutch.

Controls the position of the recycle gate. (ON = recycle gate in down position, OFF = recycle gate in up position.)

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6 January 1990

SYMBOL NAME FUNCTION LOCATION

SOL9 Original Stopper

Solenoid

SOL10 Auto Feeder So-

lenoid 1

SOL11 Auto Feeder So-

lenoid 2

Moves the original stopper down to prevent an original from being inserted.

Turns the paper feed roller of the auto sheet feeder. turns the relay rollers of the auto sheet feeder.

----

Switches

SW1 Main Switch Supplies power to the copier. 60 SW2 Upper Safety

Switch

SW3 Lower Safety

Switch

SW4 Rear Safety

Switch

SW5 Toner Cover

Switch

Cuts ac 100 volt power when the upper unit is opened.

Cuts ac 100 volt power when the middle unit is opened.

Cuts ac 100 volt power when the paper exit unit is opened.

Cuts power to the toner supply solenoid and the main motor when the

toner cartridge cover is opened.

SW6 Auto Feeder

Safety Switch

Prevents main motor operation when the auto feeder is not set.

Sensors and Detectors

S1 Image Density

Sensor

S2 Toner Density

Sensor

S3 Toner Overflow

Sensor

S4 Pulse Generator Supplies timing pulses to the main

Detects the image density of the test pattern on the drum.

Detects the density of toner in the developer.

Detects when the used toner tank is full.

board (photointerrupter).

S5 Original Set De-

Detects when an original is inserted. 39

tector

S6 1st Original

Monitors movement of the original. 11 Transport Detector

S7 2nd Original

Monitors movement of the original. 13 Transport Detector

S8 Original Regis-

tration Sensor

SYMBOL NAME FUNCTION LOCATION

Detects when the original lead edge

passes the original registration rollers.

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6 January 1990

Original Exit De-

Monitors movement of the original. 38 tector

S10 Recycle Gate

Detector

S11 1st Feed

Detects whether the recycle gate is in

the up or down position.

Detects when copy paper is inserted. 35 Detector

S12 2nd Feed

Detector

Monitors copy paper movement

between the manual feed rollers and

the registration rollers.

S13 Registration

Sensor

S14 Transport

Sensor

Detects when copy paper arrives at

the registration rollers.

Monitors paper movement between

the transfer/separation section and the

fusing unit.

S15 Exit Detector Monitors copy paper movement

through the exit unit.

S16 Upper Exit

Sensor

S17 Lower Exit

Sensor

S18 Auto Sheet

Feeder Sensor

Monitors copy paper movement

through the upper exit guides.

Monitors copy paper movement

through the lower exit guides.

Detects misfeeds in the auto sheet

feeder.

33 64

----

S19 Paper End De-

tector

Detects when the auto sheet feeder

runs out of paper.

Printed Circuit Boards

PCB1 Main Board Controls all copier functions both

directly and through other PCBs.

PCB2 DC Power

Supply

Provides dc power for all components

of the machine.

PCB3 AC Controller 1 Provides ac power to the fusing lamp

and triac.

PCB4 Lamp Regulator Provides power to the exposure lamp. 4 PCB5 AC Controller 2 Provides ac power to the main motor

and development motor.

PCB6 Indicator Panel Contains the paper and original

insertion indicators and the original

feed stop key.

PCB7 Operation Panel Contains the operator controls and

indicators.

----

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6 January 1990

SYMBOL NAME FUNCTION LOCATION

Lamps

L1 Exposure Lamp Provides light to reflect the original’s

image onto the drum.

L2 Quenching

Lamp

Neutralizes any charge remaining on

the drum surface after cleaning.

L3 Fusing Lamp Provides heat to the fusing unit. 46 L4 Pre-Transfer

Lamp (PTL)

Reduces the charge on the drum

surface prior to image transfer.

Power Packs

P1 Charge/Bias

Power Pack

Provides high voltage power for the

charge corona, charge grid, and

development bias.

P2 Transfer/Sepa-

ration Power Pack

Provides high voltage power for the

transfer corona and separation

coronas.

Thermistors

TH1 Hot Roller

Thermistor

TH2 Pressure Roller

Thermistor

Monitors the hot roller’s surface

temperature.

Monitors the pressure roller’s surface

temperature.

TH3 Exposure Lamp

Thermistor

Monitors the fluorescent lamp’s

temperature.

----

Thermofuses

TF1 Fusing

Thermofuse

TF2 Exposure Lamp

Thermofuse

Protects against fusing overheat. (Two

thermofuses in parallel.)

Protects against exposure lamp

overheat.

Heaters

H1 Lamp Heater Warms the scanning lamp. ---H2 Anticondensa-

tion Heater

Keeps moisture from forming inside

the copier.

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6 January 1990

SYMBOL NAME FUNCTION LOCATION

Others

CO1 Total Counter Keeps track of the total length of

copies made.

NF Noise Filter Filters electrical noise on the ac power

input lines.

TR Transformer Steps down the line voltage to 100

----

Vac.

TR Triac Provides ac power to the fusing lamp. 54

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6 January 1990

8. AC POWER DISTRIBUTION

Interlock Switches

SW3 SW4 SW2

Hot

C.B

Main Switch

(SW1)

Neutral

T304

N. F

T306

T307 T305

Controller 1

(PCB3)

Thermofuse(x2)

T309 T1 T310 G

T308

Fusing Lamp(L3)

CN3

-4

-5

Triac

Lamp

Regulator

(PCB4)

Exposure Lamp(L1)

Trans-

fomer

Anticondensation Heater

Exhaust

Fan

Cooling

Fan

CN1

-1 M4

-2

CN3

-1

-2 Vacuum

Fan

Main

Motor

Develop-

ment

Motor

CN402

-1

-2

CN404

-1

-2

AC Controller 2(PCB5)

1-18

CN401-1

CN401-2

6 January 1990

The preceding schematic shows how ac power is distributed in this machine. The ac power from the wall outlet passes through the noise filter, circuit breaker, and three interlock switches to the transformer and to ac controller

1. AC controller 1 powers the fusing lamp with direct wall outlet ac power. The main board controls the fusing lamp through the triac. The transformer steps the ac power down to 100 volts and then provides it to

the main switch. If the main switch is off, power is applied only to the anticondensation heater. If it is on, at 100 volts goes to the fan motors, ac controller 2, and the lamp regulator.

AC controller 2 provides ac 100 volts power to the main motor and development motor. RA401/402 turn the motors on and off.

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6 January 1990

9. DC POWER SUPPLY

FU1

CN1-1

AC LINE

ZNR

CN2-1

I C H

I N G

Vcc

C. GND

CN2-2

DC5V

C O N T

CN1-3

AC NEUTRAL

R O

Vaa

FU2

Above is a simplified schematic of the dc power supply. The dc power supply provides +5 volts (Vc) and +24 volts (Va) from CN2-2

and CN2-7 respectively to the main board. Also +24 volts (Va) is provided to the charge/bias power pack from CN2-6 and to the transfer/separation power pack from CN2-8.

CN2-3,4,5

A. GND

CN2-6,7,8

DC24V

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SECTION 2

DETAILED SECTION DESCRIPTIONS

6 January 1990

1. DRUM

1.1 DRUM CHARACTERISTICS

The organic photoconductor (OPC) drum has the following characteristics:

• It is able to accept a high negative electrical charge in the dark. (The elec-

trical resistance of the OPC drum is high in the absence of light.)

• The electric charge on the drum surface dissipates when the drum is ex-

posed to light. (The conductivity of the OPC drum is greatly enhanced by exposure to light.)

• Dissipating an amount of charge in direct proportion to the intensity of the

light. That is, where stronger light is directed to the photoconductor surface, a smaller voltage remains on the selenium.

The OPC drum used in this model has high sensitivity, good color reproduction, and good reproduction of low contrast originals (pencil originals, etc.)

1.2 HANDLING THE DRUM

The organic photoconductor drum is very sensitive to light, temperature, and corrosive gases. Please observe the following cautions when handling the OPC drum.

1. Never expose the drum to sunlight.

2. Never expose the drum to light of more than 1000 Lux for more than a minute.

3. Never touch the drum surface with bare hands. When the drum surface is touched with bare hands or becomes dirty, wipe with a dry cloth or clean with wet cotton. Wipe with a dry cloth after cleaning with wet cotton.

4. Never use alcohol when cleaning the drum. (Alcohol tends to dissolve the OPC layer.)

5. Store the drum in a cool, dry place away from heat.

6. Take care not to scratch the drum as the OPC layer is thin and easily damaged.

7. Never expose the drum to corrosive gases such as ammonia gas.

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6 January 1990

1.3 DRUM DRIVE

[F]

[B]

[E]

[D]

[C]

[G]

[J]

[H]

[I]

[A]

The OPC drum [A] is 80 millimeters in diameter and 970 millimeters long. It turns constantly when the main motor [B] is on.

When the main motor turns on, drive is transmitted to the drum as follows: main motor drive gear [C] ⇒ idle gear [D] ⇒ main drive pulley gear [E] ⇒ drum

drive belt [F] ⇒ drum drive gear [G] ⇒ drum flange [H] ⇒ drum When the drum knob [I] is tightened, the right flange [J] presses firmly against

the drum so that the drum is held tightly between the flanges. The drum and flanges turn together when the main motor is on.

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2. CHARGE

2.1 OVERVIEW

6 January 1990

[A]

[B]

Charge

Grid

This model uses a single wire corona unit [A] to charge the OPC (organic photoconductor) drum [B]. The corona wire generates a corona of negative ions when a high negative voltage is applied to it by the charge/grid power pack [P1].

To make the negative corona uniform, a grid consisting of 8 wires is installed on the charge corona unit between the corona wire and the drum. This grid drains off any charge in excess of --940 volts, thus preventing fluctuation of the charge potential.

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6 January 1990

2.2 CHARGE CORONA CIRCUIT

Charge / Bias PP

DC/DC

Converter

DC/DC

Converter

CN1-1

CN1-2

CN1-3

CN1-6

CN1-10

CN2

-6

CN107

-B14

CN110

-1

-8

DC Power

24V Va

GND

Main Board

Charge

Grid Drive

0/5

Grid monitor

2.5

The main power supply board supplies +24 volts (Va) to the charge/bias power pack as the power supply source. About 8 seconds after the Start key is pressed, the CPU drops CN107-B14 from +24 volts to 0 volt. This actuates the dc/dc converter within the power pack which applies a high negative voltage of approximately --5.3 kV to the charge corona wire. The corona wire then generates a negative corona charge.

The grid limits the maximum corona charge to --940 volts. This ensures that the charge does not fluctuate and an even charge is applied to the drum surface. When developing the test pattern for the image density sensor, the grid charge is --460 volts.

The copy grid voltage, and ID sensor grid voltage amounts can be adjusted using service program modes #23 and #22, respectively.

The grid drive signal applied to CN1-6 is a pulse width modulated signal. As the width of the pulses applied increases, the strength of the grid charge also increases. The main board monitors the grid charge at CN110-8 and controls the width of the drive pulses based on this feedback.

2-4

3. EXPOSURE

3.1 OVERVIEW

[A]

6 January 1990

[D]

[F]

[E]

[B]

Light from the exposure lamp [A] reflects off the original and through the fiber optics [B] to the OPC drum [C]. During exposure, the original moves across the exposure glass at the same speed as the drum’s peripheral velocity.

The platen roller [D] presses the original [E] flat against the exposure glass [F] just above the fiber optic array. This ensures that the image is properly focused. (The original must be within 0.2 mm of the exposure glass surface.)

The exposure lamp is a 100 V, 65 W fluorescent lamp. This lamp has a heater which prevents a reduction in light output due to low temperatures. The heater maintains the lamp’s temperature at 40oC

[C]

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6 January 1990

3.2 ORIGINAL FEED

3.2.1 Basic Operation

[G]

[F]

[I]

[B]

[A]

[C]

[H]

[L]

[J]

[K]

[E]

When the original is inserted on the original table [A], it activates the original set detector [B]. The main motor then turns on. Two seconds later the original feed clutch turns on to start turning the front original feed rollers [C], rear original feed rollers [D], and original registration rollers [E]. The two second delay allows time for the operator to align the lead edge of the original against the first set of rollers to prevent skew.

[D]

The original is fed past the 1st and 2nd original transport detectors [F,G] and around the rear original feed rollers to the original registration rollers. The original feed clutch turns off 0.2 second after the original’s leading edge activates the original registration sensor [H]. The original remains at this position until a sheet of copy paper is fed.

Just before the copy paper reaches the registration sensor, the original feed clutch turns on again and original feed resumes. The original passes between the platen roller [I] and the exposure glass [J] and from there to the front original feed rollers. The original’s image density is measured by the ADS at this time. The original’s image is reflected through the fiber optic array to the drum as it passes between the platen roller and the exposure glass.

If making a single copy, the original then exits the machine. However, if making repeat copies, the recycle gate [L] directs the original around the front original rollers to the upper part of the original transport mechanism. The original transport cycle then repeats.

The maximum original length for repeat copying is 610 millimeters. If the operator attempts repeat copying with an original longer than 610 millimeters, it will automatically feed out after making a single copy.

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3.2.2 Drive Mechanism

[A]

6 January 1990

[B]

[C]

Drive power from the main motor is provided to the original transport mechanism from the original drive pulley through original drive belt 2 [A]. When the original drive clutch [B] is energized, original drive belt 3 [C] starts turning the front original feed rollers and the original registration rollers. The rear original feed rollers are driven directly by the original drive clutch.

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6 January 1990

3.3 ORIGINAL STOPPER MECHANISM

[A]

[B]

Originals should not be inserted during a copy cycle. To prevent originals from being inserted, the machine locks the feeler of the original set detector in the down position while copying. This is accomplished by the original stopper solenoid [A].

When the original stopper solenoid turns on, the stopper arm [B] rotates against the feeler of the original set sensor. This locks the feeler in the down position so that originals can only be inserted as far as the original set sensor.

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+ 140 hidden pages