Ricoh ft 5733 Service Manual

FT5233/5433/5733

SERVICE MANUAL

IMPORTANT SAFETY NOTICES

PREVENTION OF PHYSICAL INJURY

1. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier po wer cor d is unplu gg ed .

2. The wall outlet should be near the copier and easily accessible.

3. Note that some component s of th e copier and the paper tr ay un it ar e supplied with electrical voltage even if the main switch is turned off.

4. If any adjustment or operation check has to be made with exterior covers off or open while the main switch is turned on, keep hands away from electrified or mechanically drive n com p on en ts.

5. If the hot roller temperature is low when the main switch is turned on, the copier starts idling automatically when the warm-up period is completed. Keep hands away from the mechanical and th e electrical components to avoid any injury.

6. If the start key is pressed before the copier completes the warm-up period (Ready indicator starts blinking), keep hands away from the mechanical and the electrical componen ts as th e cop i er starts making copies as soon as the warm-up period is completed.

7. The inside and the metal parts of the fusin g un it be com e extr e m ely ho t while the copier is operating. Be careful to avoid touching those components with your bare hands.

HEALTH SAFETY CONDITIONS

1. Never operate the copier without the ozone filters installed.

2. Always replace the ozone filters with the specified ones at the specified intervals.

3. Toner and developer are non-toxic, but if you get eit her of them in your eyes by accident, it may cause temporary eye discomfort. Try to remove with eye drops or flush with water as fir st ai d. If unsuccessful, get medical attention.

OBSERVANCE OF ELECTRICAL SAFETY STANDARDS

1. The copier and its peripherals must be installed and maintained by a customer service representative who has completed the training course on those models.

2. The RAM board on the main control boar d has a lithi um ba tt er y which can explode if replaced incorrectly. Replace the battery only with an identical one. The manufacturer recommends replacing the entire RAM board. Do not recharge or burn this battery. Used batteries must be handled in accordance with local regulations.

SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL

1. Do not incinerate the toner cartridge or the used toner. Toner dust may ignite suddenly when exposed to open flame.

2. Dispose of used toner, developer, an d or g an ic pho to conductor according to local regulations. (These are non-toxic supplies.)

3. Dispose of replaced parts in accordance with local regulations.

4. When keeping used lithium batteries in order to dispose of them later, do not put more than 100 batteries per sealed box. Storing larger numbers or not sealing them apart may lead to che m ical r eac tio ns an d he at build - up .

SECTION 1

OVERALL MACHINE

INFORMATION

12 February 1992 SPECIFICATIONS

1. SPECIFICATIONS

Configuration: Desktop Copy Process: Dry electrostatic transfer system Originals: Sheet/Book Original Size: MaximumA3/11" x 17" Copy Paper Size: MaximumA3/11" x 17"

Minimum B5/11" x 8

A6/5

1/2

" x 8

" - Paper tray

1/2

" (lengthwise)

1/2

-By-pass feed table

(LCT B5/A4/11" x 8

" sideways only)

1/2

(Duplex Copying) Multiple: Single/Overlay:

A4 and B5/8

" x 11" (sideways)

1/2

Maximum A3/11" x 17" Minimum B5/8" x 13"

Copy Paper Weight: • 250-sheet paper tr ay an d 10 00-sheet large

capacity tray: 52 –128g/m2, 14 –34lb

• By-pass feed table:

52 –157g/m2, 14 –43lb

Overall

Information

• Duplex and overlay:

64 –105 g/m2, 17 –28lb

Reproduction Ratios: 4 Enlargement and 6 Reduction

A4/A3 Version LT/LDG Version

200%

Enlargement

Full Size 100% 100%

Reduction

Receiving Tray Capacity:

141% 122% 115%

93% 82% 75% 71% 65% 50%

250 sheets (B4/8 100 sheets (A3/11" x 17" )

200% 155% 129% 121%

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

" x 14" and smaller)

1/2

1-1

SPECIFICATIONS 12 February 1992

Power Source: 115V, 60HZ, more than 12A (for N.A)

110V, 60HZ, (for Taiwan) 220/230/240V , 50HZ/60HZ, more than 7A (for EU and AA)

Power Consumption: Maximum: 1.5 KW

Warm-up: 0.77 KW Stand-by: 0.14 KW Copy Cycle (average): 1.2 KW

Noise Emission: Stand-by: less than 40 dB

Copy Cycle (average):

less than 57 dB (copier only) less than 59 dB (full system)

Maximum:

less than 62 dB (copier only) less than 63 dB (full system)

Dimensions:

Width Depth Height

Type 1

Type 2

Type 3

697 mm (1035 mm)

27.4" (40.7")

871 mm (1075 mm)

34.3" (42.2")

871 mm (1075 mm)

34.3" (42.2")

600 mm

23.6"

600 mm

23.6"

600 mm

23.6"

542 mm (574 mm)

21.3" (22.6")

542 mm (574 mm)

21.3" (22.6")

542 mm (574 mm)

21.3" (22.6")

( ): When the by-pass feed table is opened, the copy tray is extended, and the platen cover is installed.

Weight: Copier only (Without the opt i on al pla te n

cover=Approximately 2 kg) Type 1: approximately 78 kg (172.0 lb)

Type 2: approximately 88 kg (194.0 lb)

Type 3: approximately 84 kg (185.2 lb) Zoom: From 50% to 200% in 1% steps Copying Speed: 33 copies/minute (A4/8

" x 11" sideways)

1/2

19 copies/minute (A3)

18 copies/minute (11" x 17") Warm-up Time: Less than 110 seconds (20°C)

1-2

12 February 1992 SPECIFICATIONS

First Copy Time: Black copy:

4.5 seconds (A4/8

" x 11" sideways)

1/2

Type 1, 3: (Upper tray feed)

4.9 seconds

Type 2: (Large capacity tray feed)

Color copy:

6.6 seconds

Type 1, 3: (Upper tray feed)

7.0 seconds

Type 2: (Large capacity tray feed) Copy Number Input: Ten keys, 1 to 999 (count up or count down)

Overall

Information

manual Image Density

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

minutes or no auto reset. Copy Paper Capacity: • By-pass feed table; approximately 20 sheets

• Paper tray: approximately 250 sheets

• Large capacity tray; approximately 1000 sheets

Toner Replenishment: Black: cartridge exchange

(320 g/cartridge)

Color: manual exchange (red, blue, & green

60 g/cartridg e)

Optional Equipmen t: • Platen cover

• Document feeder

• Paper tray unit with one paper tray

•

Paper tray unit with thre e pa per trays

• 10 bin micro sorter

• 20 bin mini sorter

• 20 bin midi sorter

•

20 bin sorter stapler

•

Sorter adapter (needed when installing the mini or midi sorter, or the sorter stapler)

•

Interface PCB (needed when installing the sorter stapler or the menu reader)

• Editor (only for A074)

•

Editing interface adapter (needed when installing the editor)

1-3

SPECIFICATIONS 12 February 1992

• Color development unit

• Key counter

•

Menu reader (except for Europe)

• A3 counter (service part)

1-4

12 February 1992 MACHINE CONFIGURATION

2. MACHINE CONFIGURATION

2.1 COPIER

TYPE 1 (A069) TYPE 2 (A074) TYPE 3 (A073) UPPER TRAY 250 DUPLEX 250 LOWER TRAY 250 250 250 LCT – 1,000 1,000

2.2 OPTIONAL EQUIPMENT

10BIN SORTER (A327)

MENU READER (A952)

EDITOR (A916)

Overall

Information

20BIN SORTER

(A423)

20BIN SORTER

(A411)

ARDF (A497)

SORTER ADAPTER

(A328)

SORTER STAPLER

(A366)

PAPER TRAY UNIT PAPER TRAY UNIT

(A325)

1-5

(A326)

MACHINE CONFIGURATION 12 February 1992

COPIER

1 TRAY

PAPER

TRAY UNIT

SORTER

DOCUMENT

FEEDER

EDITOR (A916) x o x * **

MENU READER (A952) o o o **

COLOR DEVELOPMENT

UNIT (A337)

(A325)

3 TRAY

(A326) 10 BIN

(A327)

20 BIN MINI

(A423)

20 BIN MIDI

(A411) 20 BIN

STAPLER

(A366)

ARDF

(A497)

TYPE 1

(A069)

TYPE 2

(A074)

ooo

ooo *

ooo * **

ooo

TYPE3 (A073)

REQUIRED OPTIONAL

EQUIPMENT

SORTER

ADAPTER

(A328)

INTERFACE

PCB

(A344)

EDITING

INTERFACE

ADAPTER

(A345)

NOTE1: * The sorter adapter is required to install the 20 bin

mini sorter, 20 bin midi sort e r or sorter stapler.

* * The I/F board is required to install the sorter stapler

or Menu Reader.

** * (1) The editing interface adapter is required to install

the editor.

(2) The editing interface adapter can be installed

independently when more precise erasing is desired.

NOTE 2: When installing the sorter stapler, the copier must be placed

on the paper tray unit or a table of exactly the same height.

1-6

12 February 1992 COPY PROCESS AROUND THE DRUM

3. COPY PROCESS AROUND THE DRUM

2. EXPOSURE

4. DEVELOPMENT

9. QUENCHING

8. CLEANING

1. DRUM CHARGE

3. ERASE

(COLOR)

Overall

Information

ID/V SENSORS

PICK-OFF PAWLS

7. PAPER

4. DEVELOPMENT (BLACK)

5. PRE-TRANSFER LAMP

6. IMAGE TRANSFER

SEPARATION

1-7

COPY PROCESS AROUND THE DRUM 12 February 1992

1. DRUM CHARGE

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

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 reflec te d ligh t, thus producing an electrical lat en t im ag e on the drum surface.

The amount of remain ing char g e as a latent image on the drum de pe nds on exposure lamp intensity controlled by the exposure lamp voltage.

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 attr a c te d to the neg at ively cha r ge d ar e as of the drum, thus developing the latent image. (The positive triboelectric charge is caused by friction between th e car ri e r and ton er pa rticles.)

The development bias voltag e ap plie d to the deve lop m en t r oller shaf t 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 develo pment bias voltage is, the less toner is attracted to the drum surface.

5. PRE-TRANSFER LAMP (PTL)

The PTL illuminates the drum to remove almost all the 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.

1-8

12 February 1992 COPY PROCESS AROUND THE DRUM

6. IMAGE TRANSFER

Paper is fed to the drum surface at the proper timing so as to align the copy paper and the develope d im ag e on the drum surface. Then, a strong negative charge is applied to the reverse side of the copy paper, producing an electrical force which pulls the ton er pa r ticle s fr om th e dr u m sur fa ce onto 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 reverse side of the copy paper, reducing the negative charg e on the copy paper and breaking the electrical attraction between the paper and the drum. Then, the stiffness and the weight of the copy paper cause s it t o separ a te fr om th e drum surface. The pick-off pawls help to separate pa pe r and drum .

8. CLEANING

Overall

Information

The cleaning brush removes tone r rem ain ing on th e dru m aft er image transfer and the cleaning blade scrapes off all the remaining toner.

9. QUENCHING

Light from the quenching lamp electrically neutralizes the charge po tential of the drum surface.

1-9

MECHANICAL COMPONENT LAYOUT 12 February 1992

4. MECHANICAL COMPONENT LAYOUT

111098765

2 1

424142

38 37

36 35

32 31

1. 3rd Mirror

2. 2nd Mirror

3. 1st Mirror

4. Exposure Lamp

5. Lens

6. Cleaning Brush

7. Quenching Lamp

8. Cleaning Blade

9. Change Corona Unit

10. OPC Drum

11. 6th Mirror

12. Erase Unit

13. 4th Mirror

14. 5th Mirror

15. Color Development Unit

16. Black Development Unit

17. Black Toner Supply Unit

18. Pre-Transfer Lamp

19. Feed Roller

20. Pick-up Roller

21. Separation Roller

29 28 27

26 25 24 23

22. Large Capacity Tray

23. Relay Rollers

24. Registration Rollers

25. Paper Tray Feed Roller

26. Friction Pad

27. Turn Gate

28. Duplex Friction Roller

29. Duplex Feed Roller

30. Transfer & Separati on Coron a Unit

31. Jogger Fences

32. End Fence

33. Lower Paper Tray

34. Entrance Rollers

35. Duplex Tray

36. Pressure Roller

37. Pick-off Pawls

38. Hot Roller

39. Junction Gate

40. Hot Roller Strippers

41. Transport Fan

42. Fusing Exhaust Fan

1-10

12 February 1992 DRIVE LAYOUT

5. DRIVE LAYOUT

Overall

Information

134

1015

1-11

DRIVE LAYOUT 12 February 1992

1: Main Motor Pulley

3: Fusing Drive Belt 2: Drum Drive Belt

4: Drive Distribution

Gear/Pulley

23: Drive Distribution Belt Cleaning drive Gear 9: Fusing Unit Drive

12: Drive Distribution

Gear/Pulley

25: Drum Drive Pulley 24: Development Drive

Drum Development Unit

Cleaning Unit Fusing Unit

20: Toner Supply

Drive Gear/Pulley

22: Toner Supply CL

Gear

26: Development Drive

Belt

CL Pulley

Gear

6: Copier Exit

Roller Gear

7: Duplex Transport

Drive Belt

19: Paper Feed Drive

Gear/Pulley

16: Paper Feed Drive

Belt

14: Lower paper Feed

CL Gear

21: Development Unit

Shift Gears

10: Registration CL Gear 11: Upper Paper Feed CL 13: Feed Relay CL Gear

17: Relay Roller Gears

18: By-pass Feed CL

Gear

15: Tray Unit drive

Gear

8: Duplex Transport

Roller Pulley

5: Sorter Adapter Gears

1-12

12 February 1992 PAPER PATH

6. PAPER PATH

6.1 NORMAL COPYING

[D]

[E]

[C]

[B]

[A]

Overall

Information

[A]

Paper feed begins from the LCT or paper tray unit paper feed stations. The copy paper then follows one of tw o pa th s inside the copie r . The pat h fo llowe d depends on which mode the operator has selected. For copy processing, all sheets follow the same path from the paper feed mechanism [A] through the registration [B], T & S corona [C], and fusing unit [D]. After that, normal copies are delivered to the copy tra y [E], however, 2 sided copies and overlay copies are diverted for further processing.

1-13

PAPER PATH 12 February 1992

6.2 MULTIPLE 2-SIDED COPYING

[H]

[G]

[A]

[B]

[C]

[F]

Paper that is A4, B5, and 8

[E]

" X 11" sideways can be used for multiple

1/2

[D]

2-sided copying. In this mode the junction gate [A] directs sheets exiting the fusing unit to the duplex tray entrance [B]. After that, all sheets follow the path through the entrance rollers [C], and the turn gate [D]. The turn gate directs paper through the duplex feed mechanism [E] to the duplex tray [F]. After all sheets are stacked in the duplex tray, these sheets follow the path thr ough the duplex feed mechanism and relay rollers [G] to the registration rollers [H]. After that, these sheets follow the same pat h as normal cop ying fr om th e registration rollers to the copy tray.

1-14

12 February 1992 PAPER PATH

6.3 SINGLE 2-SIDED COPYING

[D]

Overall

Information

[A]

[B]

[C]

Any sheet up to A3\11" x 17" but except for A4, B5, or 8

" X 11" sideways

1/2

can be used for single 2-sided copying. In this mode, the sheet follows the same path as in multiple 2-sided copying to the duplex tray. However, the end fence [A] of the duplex tray lowers. The sheet advances over the lowered end fence. The sheet is stopped by the friction between the duplex feed and friction rollers [B,C]. It is directed to the relay rollers [D] by the reversed duplex feed roller. It stays there once. After that, the sheet follows the same path as in multiple 2-sided copying from the relay rollers to copy tray.

1-15

PAPER PATH 12 February 1992

6.4 SINGLE IMAGE OVERLAY COPYING

[B]

[A]

In this mode, the sheet follows the same path as in multiple 2-sided copying to the turn gate [A]. The turn gate directs the sheet to the relay rollers [B]. The sheet stays there once. After that, the sheet follows the same path as in multiple 2-sided copying from the relay rollers to the copy tray.

1-16

12 February 1992 ELECTRICAL COMPONENT DESCRIPTION

7. ELECTRICAL COMPONENT DESCRIPTION

Refer to the electrical component layout on the reverse side of the Point to Point (Water proof pap er) fo r symbols an d ind ex nu m ber s.

Symbol Name Function Index No.

Motors

M1 Main Drives the main unit components. 1

Overall

Information

M2 Exhaust blower Blows the ozone built up around the charge

section through the ozone filter.

M3 Upper tray lift

(non-duplex machine only)

M4 Lower tray lift Raises the bottom plate in the lower paper

M5 Transport fan Provides air flow to the transport section so

M6 Fusing exhaust

fan

M7 Scanner drive Drives the 1st and 2nd scanners (dc

M8 3rd scanner drive Drives the 3rd scanner (dc stepper). 75

Raises the bottom plate in the upper paper tray.

tray.

that paper is held on the transport guide. Also the air flow isolates the toner collection tank from fusing heat. Provides air flow to the charge corona section as well.

Removes the heat from around the fusing unit.

stepper).

M9 Optics cooling fan Removes heat from the optics unit. 77

M10 Lens drive Positions the lens. 100

M11 Duplex feed

(duplex machine only)

M12 Jogger (duplex

machine only)

M13 LCT lift Lifts up and lowers the LCT bottom plate. 79

Drives the feed roller and moves the bottom plate up and down (24 V dc stepper).

Drives the jogger fences to square the paper stack in the duplex tray (dc stepper).

1-17

103

107

ELECTRICAL COMPONENT DESCRIPTION 12 February 1992

Symbol Name Function Index No.

Circuit Board

PCB1 dc power supply Drives the exposure and fusing lamps and

rectifies 100 Vac or 220/230/240 Vac input and outputs dc voltages.

PCB2 Main control Controls all copier functions both directly

and through the other control boards.

PCB3 Scanner motor

control

PCB4 Main motor

control

PCB5 Operation panel Controls the LED matrix, and monitors the

PCB6 ADS sensor Senses the background density of the

PCB7 High voltage

supply - CTBG

PCB8 High voltage

supply - D

Controls the speed of the scanner drive motor.

Controls the rotation of the main motor. 71

key matrix.

original.

Supplies high voltage for the charge corona, grid bias, transfer corona, and development bias.

Supplies high voltage for the separation corona.

PCB9 PTL/QL stabilizer Provides high voltage for the quenching

and pre-transfer lamps.

PCB10 Duplex control

(duplex machine only)

PCB11 LCT interface

(LCT machine only)

PCB12 Guidance display

control (duplex machine only)

PCB13 Guidance display

(duplex machine only)

Controls the rotation of the duplex feed motor.

Interfaces the LCT control signal between the main control board and the LCT.

Controls the guidance display board. 92

Displays guidance for machine operation. 94

106

1-18

12 February 1992 ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

PCB14 Interface - type

G (option for sorter stapler and menu reader)

PCB15 Nose filter

(230 V machine only)

Switches

SW1 Upper paper size

- 1 (non-duplex machine only)

SW2 Upper paper size

- 2 (non-duplex machine only)

SW3 Upper paper size

- 3 (non-duplex machine only)

SW4 Upper paper size

- 4 (non-duplex machine only)

Interfaces the sorter stapler and menu reader with the main control board.

Removes electrical noise 35

Determines what size paper is in the upper paper tray.

Overall

Information

SW5 Lower paper size

- 1

SW6 Lower paper size

- 2

SW7 Lower paper size

- 3

SW8 Lower paper size

- 4

SW9 Color detection Detects if color development unit is set or

SW10 Exit cover

(Duplex machine only)

SW11 Platen cover Informs the CPU when the platen cover is

Determines what size paper is in the lower paper tray.

not and which color toner development unit is installed.

Cuts the ac power line. 64

closed.

1-19

ELECTRICAL COMPONENT DESCRIPTION 12 February 1992

Symbol Name Function Index No.

SW12 Front door safety Cuts the ac power line through RA1 and

detects if the front door is open or not.

SW13 Main Supplies power to the copier. 95

SW14 LCT cover - 1

(LCT machine only)

SW15 LCT cover - 2

(LCT machine only)

SW16 LCT down (LCT

machine only)

Lamps

L1 Quenching Neutralizes any charge remaining on the

L2 Pre-transfer Reduces the charge on the drum surface

Detects if the LCT cover is open or not. 83

Cuts the dc power line of the LCT lift motor. 84

Sends a signal to the CPU to lower the LCT bottom plate.

drum surface after cleaning.

before transfer.

L3 Fusing Provides heat to the hot roller. 60

L4 Exposure Applies high intensity light to the original

exposure.

L5 Erase Eliminates the charge for unnecessary

areas of the image on the drum surface before exposure.

Magnetic Clutches

MC1 Development

drive

MC2 Toner supply Drives the toner supply roller. 14

MC3 By-pass feed Starts paper feed from the by-pass feed

MC4 Feed relay Drives the relay rollers. 19

MC5 Registration Drives the registration rollers. 20

Drives the development roller. 11

table or LCT.

1-20

12 February 1992 ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

MC6 Upper paper

feed (non-duplex machine only)

MC7 Lower paper feed Starts paper feed from the lower paper tray. 24

Solenoids

SOL1 Development

unit change

SOL2 Pick-up roller Picks paper up from the by-pass feed table

SOL3 Duplex tray lock

(duplex machine only)

SOL4 Upper tray lock

(non-duplex machine only)

SOL5 Lower tray lock Locks the lower paper tray in the main

Starts paper feed from the upper paper tray. 22

Changes the position of the black development unit and color development unit.

or LCT.

Locks the duplex tray in the main copier. 29

Locks the upper paper tray in the main copier.

copier.

Overall

Information

SOL6 Junction gate

(duplex machine only)

SOL7 Duplex turn gate

(duplex machine only)

Sensors

S1 By-pass feed

table

S2 Upper tray set

(non-duplex machine only)

S3 Lower tray set Detects if the lower paper tray is set or not. 26

S4 By-pass feed

paper end

S5 Upper tray paper

end (non-duplex machine only)

Moves the junction gate to direct copies to the duplex tray or to the paper exit.

Moves the duplex turn gate to direct copies to the duplex tray or to the relay rollers.

Detects if the by-pass feed table is open or closed.

Detects if the upper paper tray is set or not. 21

Informs the CPU that there is no paper in the by-pass feed table.

Informs the CPU when the upper paper tray runs out of paper.

105

1-21

ELECTRICAL COMPONENT DESCRIPTION 12 February 1992

Symbol Name Function Index No.

S6 Lower tray paper

end

S7 Upper tray upper

limit (non-duplex machine only)

S8 Lower tray upper

limit

S9 Lower relay Detects the lead edge of paper from the

S10 Upper relay Detects the lead edge of paper from the

S11 Registration Detects the lead edge of paper to

Informs the CPU when the lower paper tray runs out of paper.

Detects the upper position of the paper stack in the upper tray to stop the upper lift motor.

Detects the upper position of the paper stack in the lower tray to stop the lower lift motor.

lower paper tray to determine the stop timing of the lower paper feed clutch and detects misfeeds.

upper paper tray to determine the stop timing of the upper paper feed clutch and detects misfeeds.

determine the stop timing of the feed relay clutch and detects misfeeds.

S12 Image density

(ID)

S13 V Detects the VR and VL patterns. 58

S14 Fusing exit Detects misfeeds. 62

S15 Junction gate

(duplex machine only)

S16 Scanner H.P. Informs the CPU when the 1st scanner is at

S17 Lens H.P. Informs the CPU when the lens is at the

S18 Platen position Informs the CPU when the platen cover is

S19 3rd scanner H.P. Informs the CPU when the 3rd scanner is in

Detects the density of the ID sensor pattern on the drum to control the toner density.

Detects misfeeds. 63

the home position.

full-size position.

positioned. When the angle between, the platen cover and the exposure glass is about 30 degrees.

the full size position.

S20 Original length Detects the original length. 89

1-22

12 February 1992 ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

S21 Original width Detects the original width. 96

S22 Duplex entrance

(duplex machine only)

S23 Duplex turn gate

(duplex machine only)

S24 Duplex paper

end (duplex machine only)

S25 Jogger H.P.

(duplex machine only)

S26 LCT paper end

(LCT machine only)

S27 LCT lower limit

(LCT machine only)

Detects misfeed. 109

Detects the trail edge of paper to determine the reverse timing of the duplex motor and detects misfeed.

Detects copy in the duplex tray. 102

Detects if the jogger fences are at home position.

Informs the CPU when the LCT runs out of paper.

Sends signal to CPU to stop lowering the LCT bottom plate.

101

108

Overall

Information

S28 LCT upper limit

(LCT machine only)

Heaters

H1 Drum Turns on when the main switch is off to

H2 Optics

anti-condensation (option)

H3 Upper tray

(option)

H4 Lower tray

(option)

Thermistor

TH1 Drum Monitors the temperature around the drum. 56

TH2 Fusing Monitors the temperature of the hot roller. 59

Sends signal to CPU to stop lifting up the LCT bottom plate.

prevent moisture around the drum.

Turns on when the main switch is off to prevent moisture from forming on the optics.

Turns on when the main switch is off to keep paper dry in the upper paper tray.

Turns on when the main switch is off to keep paper dry in the lower paper tray.

1-23

ELECTRICAL COMPONENT DESCRIPTION 12 February 1992

Symbol Name Function Index No.

TH3 Optics Monitors the temperature of the optics

cavity.

TH4 Duplex motor

(duplex machine only)

Thermofuse

TF1 Fusing Provides back-up overheat protection in the

Thermoswitch

TS1 Optics Provides overheat protection in the optics

Noise filter

NF1 Removes electrical noise. 40

Fuse

FU1 Main (115 V

machine only)

Monitors the temperature of the duplex motor.

fusing unit.

unit.

Provides back-up high current protection in the electrical components.

104

FU2 Sorter line (115

V machine only)

FU3 DF line (115 V

machine only)

Circuit Breaker

CB1 (230 V machine

only)

Relay

RA1 Main power Controls main power. 45

Transformer

TR1 Main Steps down the wall voltage to 100 V ac. 38

Counter

CO1 Total Keeps track of the total number of copies

Provides back-up high current protection in the electrical components of the sorter.

Provides back-up high correct protection in the electrical components of the ARDF.

Provides back-up high current protection in the electrical components.

made.

1-24

SECTION 2

DETAILED SECTION

DESCRIPTIONS

12 February 1992 PROCESS CONTROL

1. PROCESS CONTROL

1.1 OVERVIEW

ID Sensor Pattern V Sensor Pattern

Exposure Lamp Voltage

(Color)

Grid Bias Voltage

Toner Supply

Detailed

Descriptions

Drum Thermistor

(Black)

ID Sensor

V Sensor

Development

Bias

Voltage

As seen in section 1 the copy process around the drum and the copy image (image and background density) are controlled by many factors.

On this copier, the following items are controlled during the copy process to maintain good copy quality:

The exposure lamp voltage of the optics section The grid bias voltage of the drum charge section The development bias voltage and to ner supply of the development section

The items above use the following electrical components:

The operation panel (manual ID selectio n and reproduction ratio), ADS sensor, ID sensor, V sensor, drum thermistor, paper size switches, color detection switches, and RAM board (drum rotation time and SP mode data)

Refer to the process control table in the supplement sheet bag for the details on which electrical component controls which controlled item.

In the following sections, we will explain briefly how the major electrical components are controlled in the copy process.

2-1

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