Ricoh FT4421 Service manual

SECTION 1

OVERALL MACHINE

INFORMATION

1 December 1990

1. SPECIFICATIONS

Configuration:

Desk top Copy Process: Dry electrostatic transfer system Originals: Sheet/Book Original Size: Maximum A3/11"x17" Copy Paper Size: Maximum A3/11"x17"

Minimum A6/5 1/2" x 8 1/2" (lengthwise) (Duplex Copying) A4 and B5/8 1/2" x 11" (sideways) Copy Paper Weight: Cassette feed: 52 to 157 g/m2 (14 to 42 lb)

Paper tray feed: 64 to 90 g/m2 (17 to 22 Ib)

Manual feed: 52 to 157 g/m2 (14 to 42 lb)

Duplex: 59 to 104 g/m2 (16 to 27 lb) Reproduction Ratio: 2 Enlargement and 3 Reduction

A4/A3 Version LT/LDG Version

Enlargement

Full size 100% 100%

Reduction

Zoom: From 50% to 200% in 1% steps Copying Speed: 18 copies/minute (A4 /8 1/2" x 11" sideways)

10 copies/minute (A3/11" x 17") Warm-Up Time: 60 seconds (at 20oC) First Copy Time: 5.9 seconds (A4/8 1/2" x 11" sideways) Copy Number Input: Ten keys, 1 to 99 (count up)

141% 122%

93% 82% 71%

155% 129%

93% 74% 65%

Manual Image Density Selection:

7 steps

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1 December 1990

Automatic Reset: 1 minute standard setting; can also be set to 3

minutes or no auto reset. Paper Capacity: Cassettes: 500 sheets

Paper tray: 250 sheets

Manual feed table: 50 sheets Toner Replenishment: Black: Cartridge exchange (370 g/ cartridge)

Color (red, blue, & green): Cartrid ge excha ng e

(310g/cartridge)

Copy Tray Capacity: 250 sheets (B4/8 1/2" x 14" and smaller)

100 sheets (A3/ 11" x 17") Power Source: 110V / 60 Hz/ 15A (for Taiwan)

115V/ 60Hz/ 15A (for N.A.)

220V/ 50Hz/ 8A (for EU.)

220V/ 60Hz/ 8A (for EU.)

240V/ 50Hz/ 8A (for EU.)

(Refer to the serial number plate (rating plat e) to determine the power source required by the machine.)

Power Consumption: Maximum: 1.2 kw

Warm-up: 0.72 kw (average) Ready: 0.16 kw (average) Copy cycle: 0.81 kw (average)

Dimensions:

Width Depth Height

Copier only

Full system

672 mm

(26.5")

1149 mm

(45.3")

600 mm

(23.7")

600 mm

(23.7")

Weight: Copier only: 52 kg (114.7 Ib)

Full system: 71 kg (156.6 Ib) Optional Equipment: Document feeder

10 bin sorter

Duplex unit

Color development unit

Key counter

Universal Cassette

410 mm

(16.2")

513 mm

(20.2")

•Specifications are Subject to cha ng e withou t no tice .

1-2

2. OPERATION PANEL

— A4/A3 Version —

C B A

1 December 1990

— LT/LDG Version —

Section A: See page 1-4. Section B: See page 1-5 or 1-6.

Section C: See page 1-7 or 1-8.

1-3

1 December 1990

Section A —

— A4/A3 Version —

— LT/LDG Version —

4 5

1. Number Keys

The number keys are used to enter the desired numb er of copies. They are also used to input the sizes of the original and the copy image when in size magnification mode.

2. Recall/Enter Key

Press to display the number of copies entered. Also use to enter or change da ta when in size magnification mode.

3. Clear Modes Key

Press to clear all previously entered settin gs and modes.

4. Interrupt Indicator

Lights when interrupt mode is selected.

5. Interrupt Key

Press to make interrupt copies during a copy run.

6. Start Key

Press to start copying.

7. Clear/Stop Key

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

1-4

— Section B —

— A4/A3 Version —

2 3 4

6 7

1 December 1990

8 9 10

11 12

13 14

212223

1. Magnification Ratio Indicator

Shows the selected reproduction ratio and data for the Size Magnificatio n mod e.

2. Check Paper Size Indicator

Lights when improper paper size is selected in the book original mode or the duplex mode. (Copying is impossible.)

3. Check Paper Size/Dir ection Indicator

Blinks when the original size do es not mat ch with the pap er size or directio n. This indicator is functional only wit h th e do cume nt feeder. (Copying is possible.)

4. Auto Paper Select Indicator

Lights when auto paper select mode is selected. This mode is an optional feature with the document feeder.

5. Duplex Unit Indicator

Lights when the duplex unit is installed.

6. Load Paper Indicator

Lights when the cassette or the paper tray in use runs out of paper.

1819

1617

7. Add Toner Indicator

Blinks when it is time to change the toner cartridge. When it is continuously lit, the copier cannot be used unt il a new cartridge is installed.

8. Check Paper Path Indicator

Lights if there is a misfeed within the machine.

9. Manual Feed Indicator

Lights when the manual feed table is open.

10. Second Original Indicator

Lights when it is time to position the second original on the exposure glass when making duplex copies.

— Light ON —

If copying has been completed, press duplex key to cancel the duplex mode and press start key to eject copies.

— Light Blinking —

Press start key to eject copies.

11. Ready Indicator

Lights when the machine is ready to make copies.

1-5

1 December 1990

— LT/LDG Version —

2 3 4

6 7

8 9 10

11 12

212223

12. Wait Indicator

Lights when that the ma chin e is not ready to copy.

13. Copy Counter

Displays the number of copies entered. While copying, it shows the number of copies made.

14. Auto Image Density Indicator

Lights when the copier is automatically controlling image density. If this indicator blinks, refer to page 55.

15. Manual Image Density Indicator

Shows the manually selected image density. If this indicator blinks, refer to page 55.

16. Auto Image Density Key

Press to select/cancel the automatic image density mode .

1819

1617

18. Misfeed Location Displa y

Shows the location(s) of misfed paper.

19. Color Copy Indicator

Lights if a color toner development unit is insta lled .

20. Select Paper Key

Press to select the cassette or the paper tray for paper feed, or press to cancel auto paper selection mode when the document feeder is insta lled .

21. Full Size Key

Press to make copies the same size as the originals.

22. Enlarge Key

Press to make enlarged copies.

23. Reduce Key

Press to make reduced cop ies.

17. Manual Image Density Keys

Use to cancel the automatic image density mode and manually select the image density level.

24. Paper Size Indicator

Shows the size and direction of the paper in use.

1-6

— Section C — — A4/A3 Version —

5 4 6 7

1 December 1990

1. Sorter Key

Press to select the sort or stack mode. The sort mode and stack mode are optional feature s requ iring a sorter.

2. Stack Indicator

Lights when in the stack mode.

3. Sort Indicator

Lights when in the sort mode.

1112

5. Duplex Indicators

Show which duplex copying mode is selected.

6. Auto Reduce/Enlarge Indicator

Lights when in the auto reduce/enlarge mode. This mode is an optional feature requiring a document feeder.

4. Duplex Key

Press to select one of three du plex modes. These modes are optional features requiring a duplex unit.

1-7

1 December 1990

— LT/LDG Version —

5 4 6 7

7. Auto Reduce/ Enl arge Key

Press to select the auto reduce/enlarge mode. This mode is an optional feature requiring a document feeder.

8. Zoom Up Key

Press to increase the reproduction ratio in 1% step s.

9. Zoom Down Key

Press to reduce the reproduction ratio in 1% step s.

10. Size Magnification Key

Press to select the size magnification mode.

1213

11. Size Magnification Indicators

Lights when in the size magnification mode; shows when to enter the original size and copy size data.

12. 2 Single Copies Key

Press to select one of two 2 single copies modes. The 2 Sided Original mode is an optional feature requiring a document feed er.

13. 2 Single Copies Indicators

Show which the 2 single cop ies mode is selected.

1-8

1 December 1990

1-9

1 December 1990

3. COPY PROCESSES AROUND THE DRUM

2. EXPOSURE

1. DRUM CHARGE

3. ERASE

9. QUENCHING

4. DEVELOPMENT

8. CLEANING

7. PAPER SEPARATION

5. PRE-TRANSFER LAMP (PTL)

6. IMAGE TRANSFER

1-10

1 December 1990

1. DRUM CHARGE

In the dark, the charge corona unit gives a uniform negative charge to the organic photoconductive (OPC) drum. The charge remains on the surface of the drum because the OPC drum has a high electrical resistance in the dark.

2. EXPOSURE

An image of the original is reflected to the OPC drum surface via the optics assembly. 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.

3. ERASE

The erase lamp illuminates the areas of the charged drum surface that will not be used for the copy image. The resistance of the drum in the illuminated areas drops and the charge on those areas dissipates.

4. DEVELOPMENT

Positively charged toner is attracted to the negatively charged areas of the drum, thus developing the latent image. (The positive triboelectric charge is caused by friction between the carrier and toner particles.)

5. PRE-TRANSFER LAMP (PTL)

The PTL illuminates the drum to remove all negative charge from the exposed areas of the drum. This prevents the toner particles from being reattracted to the drum surface during paper separation and makes paper separation easier.

6. IMAGE TRANSFER

Paper is fed to the drum surface at the proper time so as 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 copy paper, producing an electrical force which pulls the toner particles from the drum surface to the copy paper. At the same time, the copy paper is electrically attracted to the drum surface.

7. PAPER SEPARATION

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

8. CLEANING

The cleaning brush removes most of the toner on the drum and loosens the remainder. Then the cleaning blade scrapes off the loosened toner.

9. QUENCHING

Light from the quenching lamp electrically neutralizes the surface of the drum.

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1 December 1990

4. FUNCTIONAL OPERATION

1-12

1 December 1990

5. MECHANICAL COMPONENT LAYOUT

2 3

6 7

8 9 10

13 14

33 32 31

1. Third Mirror

2. Second Mirror

3. First Mirror

4. Exposure Lamp

5. Ozone Filter

6. Cleaning Unit

7. Lens

8. Quenching Lamp (QL )

9. Charge Corona Unit

10. Sixth Mirror

11. Erase lamp (EL)

12. OPC Drum

13. Development Unit

14. Toner Supply Unit

15. Optics Cooling Fans

16. Feed Roller

17. Manual Feed Table

18. Pick-up Roller

20212224 2325262728

19. Separation Roller

20. Relay Rollers

21. Semi-circular Feed Rollers

22. Registration Rollers

23. Pre-transfer Lamp (PTL)

24. Transfer and Separation Corona Unit

25. Pick-off Pawls

26. Cleaning Brush

27. Cleaning Blade

28. Pressure Roller

29. Hot Roller

30. Duplex Turn Guide (Option)

31. Exit Rollers

32. Hot Roller Strippers

33. Exhaust Blower

1-13

G24

G29

1 December 1990

6. DRIVE LAYOUT

G17 BP2 G16 TB1 G19 G18

G7 G9

G8 G10

G4 BP3

G11G12G13

G14

G1: Main Motor Gear G20: Relay Gear

G3BP1G15

G22 G23

G25G21G20G1G2

G26

G27

G28

G2: Relay Gear G18: Relay Gear G21: Cleaning Drive Cleaning Unit G3: Timing Belt Drive Gear G19: Drum Drive Gear G22: Relay Gear BP1: Timing Belt Pulley Drum Fusing and Exit Section TB1: Timing Belt Development G23: Relay Gear

Section

G24: Relay Gear

BP2: Timing Belt G25: Hot Roller Gear

Pulley

G26: Relay Gear

G16: Development G27: Relay Gear G29: Duplex Transport

CL Gear Gear (Option)

G28: Exit Roller Gear Development CL Development Unit G17: Toner Supply CL Gear Toner Supply CL Toner Supply Unit

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1 December 1990

A Paper Feed Section

BP3: Timing Belt Pulley G11: Registration CL Gear G4: Relay Gear 2nd Feed Station Registration CL G5: Relay Gear G12: Relay Roller

CL Gear

Registration Roller 1st Paper Feed CL G6: 1st Paper Feed CL Gear Relay Roller CL 1st Paper Feed CL G7: Relay Gear Relay Roller

G13: Relay Roller Gear

1st Paper Feed Rollers G8: Paper Lift CL Gear G14: Relay Gear

G15: 2nd Paper Feed

Paper Lift CL CL Gear

G9: Paper Lift Gear 2nd Paper Feed CL

G10: Sector Gear 2nd Paper Feed Roller

1-15

789

2122242325

1 December 1990

7. ELECTRICAL COMPONENT LAYOUT

12 15 16

14 17

18 19

1. Scanner H.P. Sensor

2. Lens Motor

3. Lens H.P. Sensor

4. Exit Sensor

5. Scanner Motor

6. 2nd Paper Size SW-1 (SW4)

7. 2nd Paper Size SW-2 (SW5)

8. 2nd Paper Size SW-3 (SW6)

9. 2nd Paper Size SW-4 (SW7)

10. Main Motor

11. Development CL Sol.

12. 4th/5th Mirror H.P. Sensor

13. Toner Supply CL Sol.

14. Toner End Sensor

15. 4th/5th Mirror Motor

16. Pick-up Roller Release Sol.

17. Manual Feed Table SW

18. Development Unit Set Sensor

19. Color Switch

20. Paper Lift CL Sol.

21. 1st Paper Feed CL Sol.

22. Relay Roller CL Sol.

23. Right Cover SW

24. Registration Clutch

25. 2nd Paper Feed CL Sol.

26. 1st Paper Size SW

27. 1st Paper End Sensor

28. 2nd Paper End Sensor

29. Cassette Lift Sensor

30. Registration Sensor

31. Pre-transfer Lamp (PTL)

32. ID Sensor

33. Total Counter

34. Erase Lamp (EL)

35. Transfer and Separation Corona Unit

36. Charge Corona Unit

37. Fusing Lamp

38. Quenching Lamp (QL)

39. Auto ID Sensor

40. Toner Overflow Sensor

41. Fusing Thermistor

42. Fusing Thermofuse

43. Tray Lock Sol.

1-16

1 December 1990

44. Key Counter (Option)

45. Main Board

46. CC/Grid/Bias Power Pack

47. Optics Cooling Fan Motors

48. Optics Thermoswitch

49. Exposure Lamp

50. Operation Panel Board

51. Exhaust Blower Motor

52. Cover Safety SW

53. Main SW

54. Drum Anti-condensation Heater

55. Main DC Power Supply Board

56. Optional DC Power Supply Board (Option)

57. Optional Transformer (Option)

58. Main Transformer

59. AC Drive Board

60. Main Motor Capacitor

61. TC/SC Power Pack

62. Interface Board (Option)

1-17

1 December 1990

8. ELECTRICAL COMPONENT DESCRIPTIONS

SYMBOL NAME FUNCTION INDEX

NO.

Motors

M1 Main Motor Drives all the main unit components except

for the optics unit and fans. (115/220/240Vac)

M2 Scanner Motor Drives the scanners (1st and 2nd). (dc

stepper)

M3 Lens Motor Moves the lens position according to the

selected magnification. (dc stepper)

M4 4th/5th Mirror Mo-

tor

M5 Optics Cooling

Fan Motor-1

M6 Optics Cooling

Fan Motor-2

M7 Exhaust Blower

Motor

Move the 4th/5th mirror position according to the selected magnification. (dc stepper)

Prevents built up of hot air in the optics cavity. (24 Vdc)

Removes heat from around the fusing unit and blower the ozone built up around the charge section to the ozone filter.

Magnetic Clutch

MC1 Registration

Clutch

Drives the registration roller. 24

Solenoid

SOL1 Toner Supply

Clutch Solenoid

SOL2 1st Paper Feed

Clutch Solenoid

SOL3 2nd Paper Feed

Clutch Solenoid

SOL4 Pick-up Roller

Release Solenoid

SOL5 Paper Lift Clutch

Solenoid

SOL6 Tray Lock Sole-

noid

SOL7 Development

Clutch Solenoid

SOL8 Relay Roller

Clutch Solenoid

Drives the toner supply roller via the toner supply spring clutch.

Starts paper feed from the first paper station.

Starts paper feed from the 2nd paper station.

a) After the paper is fed, releases the pick-up roller from next paper. b) When the manual feed table is used, releases the pick-up roller from the table.

Lifts paper to the appropriate feed position. 20

Locks the paper tray/duplex unit. 43

Drives the development unit. 11

Drives the relay roller for the 2nd cassette station.

1-18

1 December 1990

SYMBOL NAME FUNCTION INDEX

NO.

Switches

SW1 Main Switch Supplies power to the copier. 53 SW2 Cover Safety

Switch

SW3 1st Paper Size

Switch

SW4 2nd Paper Size

Switch-1

SW5 2nd Paper Size

Switch-2

SW6 2nd Paper Size

Switch-3

SW7 2nd Paper Size

Switch-4

SW8 Color Switch Determines which color development unit is

SW9 Manual Feed Ta-

ble Switch

SW10 Right Cover

Switch

Cuts the ac power line. 52

Determines what size paper is in the first cassette.

Determines what size paper is in the paper tray.

installed. Detects when the manual feed table is

open. Detects when the right cover is open. 23

Sensor

S1 Scanner Home

Position Sensor

Informs the CPU when the 1st scanner is at the home position.

S2 Lens Home

Position Sensor

S3 4th/5th Mirror

Home Position Sensor

S4 Registration

Sensor S5 Exit Sensor Detects misfeeds. 4 S6 1st Paper End

Sensor S7 2nd Paper End

Sensor S8 Toner End

Sensor S9 Toner Overflow

Sensor S10 Paper Lift

Sensor

Informs the CPU when the lens is at the home position (full size position).

Informs the CPU when the 3rd scanner (4th/5th mirrors assembly) is at the home position (full size position).

Detects misfeeds. 30

Informs CPU when the first cassette runs out of paper.

Informs CPU when the paper tray runs out of paper.

Detects when it is time to add toner. 18

Detects when the used toner tank is full. 40

Detects the correct feed height of the cassette.

1-19

1 December 1990

SYMBOL NAME FUNCTION INDEX

NO.

S11

S12 Development

Image Density

(ID) Sensor

Unit Set Sensor

Detects the density of the image on the drum to control the toner density.

Sensors whether or not the development unit is properly set.

Printed Circuit Board

PCB1 Main Board Controls all copier functions both directly

and through the other PCBs.

PCB2 AC Drive Board Drives all ac motors, the exposure lamp,

fusing lamp, quenching lamp, exhaust blower motor.

PCB3 Main DC Power

Supply Board PCB4 Auto Image

Density Sensor

(ADS) PCB5 Optional DC

Power Supply

Board PCB6 Interface Board Interfaces between the copier main board

PCB7 Operation Panel

Board

Rectifies 26 and 10 Vac input and outputs dc voltages.

Senses the background density of the original.

Rectifies 26 and 10 Vac input and outputs dc voltasges.

and all the optional equipment’s main board. Informs the CPU of the selected modes

and displays the situations on the panel.

Lamps

L1 Exposure Lamp Applies high intensity light to the original for

exposure. L2 Fusing Lamp Provides heat to the hot roller. 37 L3 Quenching Lamp Neutralizes any charge remaining on the

drum surface after cleaning. L4 Erase Lamp Discharge the drum outside of the image

area. Provides leading/trailing edge erase. L5 Pre-transfer

Lamp

Reduces charge on the drum surface

before transfer.

Power Packs

P1 CC/Grid/Bias

Power Pack

P2 TC/SC Power

Pack

Provides high voltage for the charge

corona, grid, and the development roller

bias.

Provides high voltage for the transfer and

separation corona.

1-20

1 December 1990

SYMBOL NAME FUNCTION INDEX

NO.

Heaters

H1 Drum Anti-

condensation Heater

H2 Optics Anti-con-

densation Heater Option

Counters

CO1 Total Counter Keeps track of the total number of copies

CO2 Key Counter

(Option)

Prevents moisture around the drum. 54

Prevents moisture from forming on the

optics.

made.

Used for control of authorized use. Copier

will not operate until installed.

Transformer

TR1 Main Transformer Steps down the wall voltage to 26 Vac and

10 Vac. TR2 Optional

Transformer

Steps down the wall voltage to 26 Vac and

10 Vac for the document feeder and duplex

unit.

Others

TH Fusing

Thermistor

Monitors the fusing temperature. 41

N/A

TF Fusing

Thermofuse

TS Optics

Thermoswitch

C Main Motor Ca-

pacitor

Provides back-up overheat protection in the

fusing unit.

Provides back-up overheat protection

around the exposure lamp.

Start capacitor 60

1-21

1 December 1990

9. OVERALL MACHINE CONTROL

AC Power (115V or 220/240V)

Cover Safety Switch

Operation

Panel Board

Exhaust Blower Motor (L)

Fusing Lamp

Exposure Lamp

Main Motor Quenching Lamp Exhaust Blower Motor (H)

Main Switch

AC Drive Board

Power Relay Fusing Lamp

Drive Circuit

Exposure Lamp

Drive Circuit

Main Motor Relay

Power Packs

CC/Grid/Bias P.P.

Charge Corona

Grid Voltage

Dev. Bias

TC/SC P.P.

Counters

Total Counter

Key Counter

IC 123

CPU

IC 105

I/O

IC 124

I/O

IC 111

ROM

Main Board

RAM Board

Anti-condensation Heater

Sensors/Switches/Thermistor

Image Density Sensor Registration Sensor Cassette Lift Sensor Exit Sensor Auto ID Sensor Scanner HP Sensor Lens HP Sensor 4th/5th Mirror HP Sensor Toner Overflow Sensor Toner End Sensor Color Switch 1st/2nd Paper Size Switches 1st/2nd Paper End Sensors Right Cover Switch Manual Feed Table Switch

Fusing Thermistor

Solenoids/Clutches

Pick-up Roller Release Sol. Cassette Lift CL Sol. 1st/2nd Paper Feed CL Sol. Relay Roller CL Sol. Registration Clutch Tray Lock Sol. Development Drive CL Sol. Toner Supply CL Sol.

Motors

Scanner Motor Lens Motor 4th/5th Mirror Optics Cooling Fan Motor

-Drum

-Optics

ARDF

Duplex

Sorter

Serial Serial

Interface

Board

NOTE: The interface board is connected to the copier main board when the ARDF, duplex unit and/or sorter is installed.

The above diagram shows the cont rol syste m of th is copie r in block form. The CPU (IC123) on the main board controls the timing of all copie r’s ope rat ion based on the CPU’s internal clock. The CPU monit ors the inp ut signals from all sensors and controls the dc comp on ents directly or through two I/O chips (IC 105 and IC 124). It also con tro ls a c components such as the fusing lamp, exposure lamp, main motor qu en chin g lamp , an d exh au st blo wer motor (High speed) directly via the ac drive board. The exh au st blo wer motor (Low speed) is controlled via the I/O chip (IC 124) an d ac drive board. The cha rge corona, grid voltage and development bias are powered by the same power pack (P1) but are controlled separa te ly a s shown above. The main board has a RAM board for the service program mode and misfeed recovery. A battery backs up the power to the RAM board.

1-22

10. AC POWER AND DC POWER DISTRIBUTION

AC Power (115V or 220/240V)

Main SW

Cover Safety SW

1 December 1990

Anti-condensation Heater

-Drum

-Optics (Option)

Exhaust Blower

Motor (L)

Fusing Lamp

Exposure Lamp

Main Motor Quenching Lamp Exhaust Blower

Motor (H)

Optional Transformer

26V AC 10V AC

FU100 (5V) FU101 (24V)

Optional DC Power Supply

Board

24V

(VA)5V(VC)

ARDF

24V

(VA)5V(VC)

Duplex

Fuse

Power Relay

(RA401)

Fusing Lamp

Drive Circuit

Exposure Lamp

Drive Circuit

Main Motor

Relay (RA402)

AC Drive Board

Main Transformer

10V AC 26V AC 26V AC

Main DC Power Supply Board

FU100 (5V) FU101 (24V) FU102 (30V)

24V (VA)

30V (VM) 24V (VA)

5V (VC)

Zero

Cross

RAM PCB

Main

Board

Interface

Board

Scan

Operation Panel Board

Signal 5V (VC)

Solenoids Clutches

24V (VA)

30V (VM)

Power Packs Lens Motor 4th/5th Mirror Motor Optics Cooling Fan

Scanner Motor

Sensors Switches Interface Board

Motors

ac power dc power

24V (VA)

Sorter

5V (VC)

When this copier is plugged in and the main switch is turned off, ac power is supplied via the ac drive board to the anti-co nd ensation heater. When the front cover and/or the exit cove r is open, the cover safety switch complete ly cuts off power to all ac and dc components. The RAM board has a back up power supply (dc battery) for the service program mode and misfeed job recovery.

When the main switch is turned on, the ac power sup ply to the anti-condensation heat er is cut of f an d ac power is supp lied to the ac drive board. The main transformer receives wall outlet ac power through the ac drive board and outputs 10 volts ac and 26 volts ac to the main dc power supply board.

1-23

1 December 1990

The main dc power supply board converts the 10 volts ac input to +5 volts and a zero cross signal. There are two 26 volts ac inputs. The dc power supply board converts them t o +24 volts an d +30 volts.

The +5 volts and +24 volts are supplied to both th e copier main board and the sorter main board. The zero cross signal and +30 volts are supplied to the copier main board.

The copier main board supplie s dc powe rs to all cop ier dc components. All sensors, and switches plus the inte rfa ce bo ard ope rat e on +5 volts. The scanner motor operate s on +30 volts. All other dc componen ts inclu ding the power relay (RA401) and the main motor relay (RA 402) operate on +24 volts. The ARDF and the duplex unit have a separat e dc power sup ply.

When the main board receives power, it act ivat es th e power rela y (RA401) which then supplies ac power to the fusin g lamp drive circuit, and the exposure lamp drive circuit on the ac drive board. The exhaust blower motor begins rotating at low speed. The fusing lamp drive circuit receives a trigger signal from the main board an d the fusing lamp lights. The exposure lamp does not turn on until the main boa rd send a trigger pulse to the exp osure lamp drive circuit.

When the Start key is pressed, the main bo ard ene rgize s the main mot o r relay (RA402). Then, the ma in mot or an d the quenching lamp turn on an d th e exhaust blower starts rotating at high speed.

When the main switch is turned off, power is cut off to the main board an d to RA401, and the drum and optional anticondensa tio n he at ers are turned on. The exposure lamp and the fusing lamp power lines are completely disconnected from the lin e volt ag e.

1-24

10.1 AC POWER DISTRIBUTION

Main SW

(SW1)

115V 220/240V

To DF and Duplex

[24] VA [5] VC [0] GND

To Sorter

[24] VA [5] VC [0] GND

ZERO

CROSS [0] GND [0] GND [30] GND

[0] GND [24] VA [0] GND

[5] VC

Main Board

(PCB1)

CN108-1 CN108-2 CN107-1 CN107-2 CN107-3 CN107-4 CN107-5 CN107-6

CN122-7

CN122-6 CN122-10

CN122-14 CN122-9

Optional DC Power Supply Board (PCB5)

TR1

Cover Safety SW (SW2)

10V AC

26V AC

CN103-1 CN103-2 CN103-3

CN100-1 CN100-2 CN100-3 CN100-4 CN100-5 CN100-6

CN102-2 CN102-1 CN101-1 CN101-2 CN101-3 CN101-4 CN101-5 CN101-6

TR2

T404

Fuse

T407

CN418-1

CN418-3 CN417-3

CN417-1

26V AC 26V AC

10V AC

DC Power Supply Board

(PCB3)

CN401-8 CN401-9

CN401-5

CN401-1 CN401-6

T403 T401T402

RA401

Drive

Board

(PCB2)

Noise Filter Circuit (220/240V Only)

Exposure Lamp Drive Circuit

Fusing Lamp Drive Circuit

RA402-1

RA402-2

CN421 (220/240V

Only)

1 December 1990

CN411-1

CN411-2

Drum Anti-condensation Heater (H1)

CN420-3 CN420-2

Exhaust Blower Motor CN419-1

Exposure Lamp T405

Fusing Lamp

Thermoswitch

Thermo-

fuse

169 C (TF)

CN413-1 Main Motor (M1)

CN415-1

(TS)

(L1)(L2)

Quench-

ing Lamp

(L3)

(M7)

CN122-13 CN122-12 CN122-11

CN401-2 CN401-3

CN401-4

Main Motor Relay

1-25

Power Relay

RA401 RA402

CN415-2 CN413-2

T406 CN419-2 CN420-1

1 December 1990

10.2 DC POWER DISTRIBUTION

CN417

-1

115V

220/240V

CN417

-3

CN100

10VAC

CN100

26VAC

CN100

26VAC

CN100

DC Power Supply Board

FU100

-5

-6 D101

FU101

-3

-4 FU102

-1

-2

ST100

D100

R104

ST101

ST102

R100

+ C100

R107

C110

Q100

R105

+ C101

Q102

+ C107

R108C110

D102

IC100

D104

IC101

R101 R102

R106

C114C111

C103+C104

C109 D105 C113

C108

D103

R103

C112

Q101C105

CN101-6CN107

CN103

-2

CN102

-2

CN103

-1

CN101

-5

CN102

-1

CN101

-4

CN103

-3

CN101-3CN107

CN101

-2

CN101

-1

(

Sorter

CN108

Sorter

CN107

CN108

CN107

Sorter

CN107

Main Board

-6

)

-1

)

-5

-2

-4

)

-3

-2

-1

[5]Vc

Zero

Cross

[0]GND

[24]VA

[0]GND

[30]VM

[0]GND

[24]VA

[5]VC

[30]VM

[0]GND

1-26

SECTION 2

SECTIONAL DESCRIPTION

1 December 1990

1. DRUM

1.1 OPC DRUM CHARACTERISTICS

An OPC has the characteristics of:

1. Being able to acce pt a high negat ive ele ctrical charge in the dark. (The electrical resistance of a photoco nd uct or is high in the absence of light.)

2. Dissipatin g the ele ctrica l ch arg e whe n exp ose d to light . (Exp osu re to lig ht greatly increases the conductivity of a photocond uctor.)

3. 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 remain s on the OP C.

4. Being less sensitive to changes in temperatu re (whe n compared to selenium F type drums). This makes it unnece ssary to monitor and control the drum temperature.

2-1

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