Ricoh FT3313, FT3113, FT3013, FT3213 Service Manual

A151/A152

SERVICE TRAINING

MANUAL

6. MAJOR DIFFERENCE BETWEEN THE FT3013/FT3213 AND FT3113/FT3313 COPIERS

The FT3013/FT3213 (A151 and A152) are developed based on the FT3113/FT3313 (A076 and A077). The following table lists the major differences between the FT3013/FT3213 series and the

FT3113/FT3313 series.

No. ITEM FT3013/FT3213 FT3113/FT3313

Overall

Energy Saver Function Newly added. Not available.

Copy Paper Weight The copy paper weight specification has been

Operation Panel 10 independent number keys for faster and

Around the Drum

Pre-Transfer Lamp The pre-transfer lamp has been removed. the

Cleaning Mechanism Counter blade system. Trailing system with brush.

Drum Drive Mechanism The main motor directly drives the drum. The

Erase Mechanism For the FT3013 copier, side erase is

Development Drive Mechanism The development clutch solenoid has been

Paper Feed

Paper Feed Mechanism

(Paper Tray) Paper Feed Mechanism

(By-Pass feed table) Misfeed Indication PE, J1 and J2. J1, J2, and J3.

Fusing

Fusing Lamp Control Fusing lamp control mechanism has changed

narrowed due to the changes in the paper feed mechanism.

Quantity keys. easier operation. The access to the SP modes have been changed due to this reason.

The PTL is installed. same PTL for the FT3113/3313 series is available for the FT3013/3213 series as optional service equipment.

Due to this, the transfer corona adjustment standard has been changed.

Setting powder should be applied on the blade and drum after servicing.

An independent drum motor drum motor and the drum motor board have been removed.

performed by the platen cover. (The FT3213 copier is the same as the FT3313)

removed.

Semicircular feed rollers and corner separator system.

Auto feed mechanism is newly applied. No auto feed.

Indication change only. The basic detection mechanism has not changed.

to achieve stable temperature control of the hot roller.

drives the drum.

FTR (Feed + Torque Roller)

feed system with corner

separators.

No. ITEM FT3013/FT3213 FT3113/FT3313

Copy Process Control

Grid Voltage for Image Density

Control

Exposure Lamp Voltage for

Image Density Control

Drum Temperature Correction The drum temperature correcton has been

Optics

Optics Thermistor and Cooling

Fan

Drum Cleaning

Used toner Overflow Detection Since the elimination of the PTL and the

Installation

Developer Developer is not equipped to the copier at the

220-230V to 240V Conversion The conversion for the exposure lamp is

Key Counter In order to install the optional key counter,

Document Feeder (A365)

Installation From the May production, to install the DF to

Service Program Mode

Sales Mode The salesman mode has been eliminated. Some SP modes can be

Service Call

E40 "Optics Thermistor Error"

The grid voltage does not change whether the manual image density is selected or auto image density is selected (with the exception of SP34 setting).

The Vl correction method has changed to prevent over applying of the exposure lamp voltage. A white reference plate has been added under the left scale supporting bracket.

eliminated.

An optics thermistor has been added to monitor the optics temperature for the operation of the optics cooling fan motor for the FT3213 copiers. Since the cooling fan is not installed on the FT3013 copier, the optics thermistor monitors the optics temperature to prevent overheating in the optics cavity. However the copier may stop for some extra waiting time when the thermistor detects a certain high temperature condition.

change of the QL, the used toner overflow detection cycle has been changed.

1. When the copy quantity reaches 80K copies.

2. When the number of toner end conditon reaches 9.

factory. A new pack is necessary when installing the copier.

required. The conversion for the dc power supply board is not required.

some service parts need to be ordered.

the FT3213, the ADF interface unit and the two stud screws are an accessory of the DF.

has been eliminated.

The grid voltage is different

depending on whether the

image density is manually

selected or the auto image

density mode is used.

The Vl correction is applied at

set intervals.

The optics thermistor is not

equipped. The optics cooling

fan operates during the copy

cycle.

1. Same as the FT3013/3213.

2. When the number of toner

end condition reaches 11.

The coversion for the

exposure lamp and dc power

supply board is required.

The ADF interface unit and the

two stud screws are installed

on the FT3313.

accessed by the sales

representatives.

No. ITEM FT3013/FT3213 FT3113/FT3313

Test Points

24 Test Points Some test points on the main control board

have been eliminated.

Replacement and Adjustment

25 Transfer Corona Current

Adjustment

26 Fusing Unit Removal the fusing unit removal procedure has been

The adjustment standard is DC -34.0 ± 0.5 µA

modified to achieve faster servicing.

The adjustment standard is

DC -20.0 ± 0.5 µA

7. MAJOR UNIQUE PARTS FOR THE FT3013/FT3213 (Compared with the FT3113/FT3313)

PM Parts

Parts Number Description Remarks

AD002044

Electrical Parts

Parts Number Description Remarks

A1515100 A1525100 AZ220019 A1525660 AZ320075 AZ320076

A1515276 AX640056 AX640057

A1525610

AW100028

A1525120

A1525241

AW100033

A1535211

A1535213

AW020075

AX020078 AX520023 AG010049 AG010051

Cleaning Blade Cleaning Brush eliminated Paper Feed Roller eliminated Torque Roller eliminated

Main Board for FT3013 Main Board for FT3212 DC Power Supply Board - 115V AC Drive Board - 115V Power Pack - CC/G/B Power Pack - T/D Erase Lamp for FT3013 Optics Cooling Fan Motor for FT3213 Exhaust Blower Motor Quenching Lamp - 115V Fusing Thermistor Optics Control Board (Auto ID Sensor) ID Sensor Board Optics Thermistor 4th/5th Mirror Drive Motor Lens Drive Motor Photointerrupter Main Motor - 115V Exposure Lamp - 97V/220W Operation Panel Assembly for FT3013 Operation Panel Assembly for FT3213

Consumables

The toner used by the FT3013/3213 is different from the FT3113/FT3313.

SECTION 1

OVERALL MACHINE

INFORMATION

1. SPECIFICATIONS

Configuration: Desk top Copy Process: Dry electrostatic transfer system Original Type: Sheet/Book Original Alignment: Left center Original Size: Maximum: A3/11" x 17" (lengthwise) -- FT3213

copier B4/10" x 14" (lengthwise) -- FT3013 copier

Copy Paper Size: Maximum: B4/10" x 14" (lengthwise)

Minimum:

Paper Tray: A5/51/2" x 81/2" (lengthwise) Bypass Feed: A6/51/2" x 81/2" (lengthwise)

Copy Paper Weight: Paper tray feed -- 64 to 90 g/m2 (17 to 24 lb)

Bypass feed -- 52 to 105 g/m2 (14 to 28 lb)

Reproduction Ratios: 2 Enlargement and 3 Reduction (FT3213 copier

only)

A4 Version Letter Version

Enlargement

Full size 100% 100%

Reduction

Zoom: From 61% to 141% in 1% steps

(FT3213 copier only)

Copying Speed: 13 copies/minute (A4/81/2" x 11" lengthwise)

10 copies/minute (B4/81/2" x 14") Warm-Up Time: 30 seconds (at 20°C/68°F) First Copy Time: 9 seconds (A4/81/2" x 11" lengthwise) Copy Number Input: Number keys, 1 to 99 Manual Image Density: 7 steps Toner Type: Type 320

141% 122%

93% 82% 71%

129% 121%

93% 74% 65%

Developer Type: Type 310

FT3013/3213 1-1 STM

Automatic Reset:

1 minute standard setting; can also be set to 3

minutes or no automatic reset. Energy Saver Function: Automatic Paper Capacity: Paper tray -- 250 sheets

Bypass feed table -- 1 sheet Toner Replenishment: Cartridge exchange (320 g/cartridge) Copy Tray Capacity: 100 sheets (B4/10" x 14" or smaller) Power Source: 110V/ 60Hz/ 15A (for Taiwan)

115V/ 60Hz/ 15A (for North America)

220V -- 240V/ 50Hz/ 8A (for Europe)

220V/ 60Hz/ 8A (for Middle East)

220V/ 50Hz/ 8A (for Asia)

(Refer to the serial number plate (rating plate) to

determine the power source required by the

machine.) Power Consumption:

Copier Only With DF*

Maximum 1.4 kVA 1.5 kVA Warm-up 620 VA (average) 640 VA (average) Copy cycle 810 VA (average) 860 VA (average) Ready 160 VA (average) 180 VA (average)

Noise Emission:

Copier Only With DF* Maximum 58 db 60 db Copy cycle Less than 55 db Less than 55 db Ready Less than 39 db Less than 39 db

Dimensions:

Width Depth Height

Copier with platen cover and

copy tray

Copier with document feeder

and copy tray

713 mm (28.1") 592 mm (23.3") 400 mm (15.7")

713 mm (28.1") 592 mm (23.3") 463 mm (18.2")

*NOTE: The document feeder can be installed only on the FT3213 copier.

STM 1-2 FT3013/3213

Weight: Copier only: 43 kg (94.8 lb)

With DF: 50 kg (110.2 lb)

Optional Equipment: (Sales items)

Optional Equipment: (Service items)

Document feeder (FT3213 copier only) Key counter

Drum anti-condensation heater Optics anti-condensation heater Pre-transfer lamp Optics cooling fan (for FT3013 copier only)

• Specifications are subject to change without notice.

Model Designations: A151 = FT3013

A152 = FT3213

FT3013/3213 1-3 STM

2. MECHANICAL COMPONENT LAYOUT

21 22 23

24 25

32 33

1. Semicircular Feed Rollers

2. Paper Tray

3. Registration Rollers

4. Transfer and Separation Corona Unit

5. Pick-off Pawl

6. Cleaning Unit

7. Pressure Roller

8. Fusing Unit

9. Hot Roller

10. Exit Rollers

11. Copy Tray

12. Hot Roller Strippers

13. Exhaust Blower Motor

14. 3rd Mirror

15. 2nd Mirror

16. 1st Mirror

17. Ozone Filter

18. Used Toner Tank

19. Cleaning Blade

20. Quenching Lamp

21. Charge Corona Unit

22. Lens

23. 6th Mirror

24. Erase Lamp

25. Drum

26. 4th Mirror

27. 5th Mirror

28. Optics Cooling Fan Motor (FT3213 Copier only)

29. Toner Supply Unit

30. Development Unit

31. 2nd Relay Rollers

32. By-pass Feed Table

33. 1st Relay Rollers

STM 1-4 FT3013/3213

3. ELECTRICAL COMPONENT LAYOUT

17 16

33 34

1. Paper Tray Switch

2. Relay Sensor

3. Registration Clutch

4. Optics Cooling Fan Motor (FT3213 only)

5. Registration Sensor

6. Image Density Sensor

7. Power Pack-TC/SC

8. Operation Panel Board

9. Erase Lamp

10. Total Counter

11. Quenching Lamp

12. Fusing Lamp

13. Front Cover Safety Switch

14. Main Switch

15. Fusing Thermoswitch

16. Exit Sensor

17. Exhaust Blower Motor

18. Optics Thermofuse

19. Auto Image Density Sensor

20. Fusing Thermistor

21. Exposure Lamp

22. Lens Motor (FT3213 copier only)

23. Scanner Home Position Sensor

24. Optics Thermistor

25. Lens Home Position Sensor (FT3213 copier only)

26. Power Pack-CC/Grid/Bias

27. AC Drive Board

28. Fusing Triac (115 V only)

29. Scanner Motor

30. 4th/5th Mirror Home Position Sensor (FT3213 copier only)

31. 4th/5th Mirror Motor (FT3213 copier only)

32. Main Motor Capacitor

33. Main Board

34. Main Motor

35. Toner Supply Clutch

36. DC Power Supply Board

37. Relay Roller Clutch

38. Paper Feed Clutch

FT3013/3213 1-5 STM

Rev. 1/95

4. ELECTRICAL COMPONENT DESCRIPTIONS

Motors

SYMBOL NAME FUNCTION

Drives all the main unit components except for the

M1 Main Motor

M2 Scanner Motor Drives the scanners (1st and 2nd). (dc stepper) 29

M3 Lens Motor

4th/5th Mirror Motor

Optics Cooling Fan Motor

Exhaust Blower Motor

optics unit and fans. (115/220--240 Vac [ac synchronous])

Positions the lens according to the selected magnification. (dc stepper) … FT3213 copier only

Positions the 4th/5th mirrors according to the selected magnification. (dc stepper) … FT3213 copier only

Prevents a build up of hot air in the optics cavity. (24 Vdc) … FT3213 copier only

Removes heat from around the fusing unit and moves the ozone built up around the charge section to the ozone filter. (24 Vdc)

INDEX

NO.

Magnetic Clutch

SYMBOL NAME FUNCTION

MC1

Registration Clutch

Drives the registration rollers. 3

Magnetic Spring Clutches

SYMBOL NAME FUNCTION

MSC1

MSC2

MSC3

Toner Supply Clutch

Relay Roller Clutch

Paper Feed Clutch

Drives the toner supply roller. 35

Drives the 1st and 2nd relay rollers. 37

Starts paper feed. 38

INDEX

NO.

INDEX

NO.

STM 1-6 FT3013/3213

Switches

SYMBOL NAME FUNCTION

SW1 Main Switch Supplies power to the copier. 14 SW2

SW3

Front Cover Safety Switch

Paper Tray Switch

Cuts the ac power line, when the front cover is open.

Detects when the paper tray is set. 1

Sensors

SYMBOL NAME FUNCTION

S4 S5 Exit Sensor Detects misfeeds. 16

S6 Relay Sensor

Scanner Home Position Sensor

Lens Home Position Sensor

4th/5th Mirror Home Position Sensor

Registration Sensor

Image Density (ID) Sensor

Auto Image Density Sensor (ADS)

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

Informs the CPU when the lens is at the home position (full size position). … FT3213 copier only

Informs the CPU when 4th/5th mirrors assembly is at the home position (full size position). … FT3213 copier only

1) Detects misfeeds.

2) Controls the relay roller clutch stop timing.

1) Detects when copy paper is set on the by-pass feed table.

2) Detects misfeeds. Detects the density of the image on the drum to

control the toner density.

Senses the background density of the original. 19

INDEX

NO.

INDEX

NO.

Printed Circuit Boards

SYMBOL NAME FUNCTION

PCB1 Main Board

PCB2 AC Drive Board

PCB3

PCB4

FT3013/3213 1-7 STM

DC Power Supply Board

Operation Panel Board

Controls all copier functions both directly and through the other PCBs.

Drives the main motor, exposure lamp, fusing lamp, and quenching lamp.

Converts the wall outlet ac power input to +5 volts, +24 volts, and a zero cross signal.

Informs the CPU of the selected modes and displays the copier status and condition on the panel.

INDEX

NO.

Lamps

SYMBOL NAME FUNCTION

L1 Exposure Lamp L2 Fusing Lamp Provides heat to the hot roller. 12 L3 Quenching Lamp

L4 Erase Lamp

Applies high intensity light to the original for exposure.

Neutralizes any charge remaining on the drum surface after cleaning.

Discharge the drum outside of the image area. Provides leading/trailing edge erase and side erase.

Power Packs

SYMBOL NAME FUNCTION

Power Pack

--CC/Grid/Bias Power Pack

--TC/SC

Provides high voltage for the charge corona, grid, and development roller.

Provides high voltage for the transfer and separation corona.

Counter

SYMBOL NAME FUNCTION

CO1 Total Counter Keeps track of the total number of copies made. 10

INDEX

NO.

INDEX

NO.

INDEX

NO.

Others

SYMBOL NAME FUNCTION

TH1

TH2

TR Fusing Triac

Fusing Thermistor

Optics Thermistor

Fusing Thermoswitch

Optics Thermofuse

Main Motor Capacitor

Monitors the fusing temperature. 20

Monitors the optics temperature. 24 Provides back-up overheat protection in the fusing

unit. Provides back-up overheat protection around the

exposure lamp. Start capacitor. 32 Switches the fusing lamp on and off. (115 V only)

Note: In the 220V-230V/240V version, the triac

is built-in the ac drive board

INDEX

NO.

STM 1-8 FT3013/3213

5. DRIVE LAYOUT

G14

G13

G15 G16

G17 G18

G19

G1: Main Motor Gear

BP6 BP5

G22 BP1G21G20

G26 G25

TB2

TB3

TB1

BP2

G12 G11

G10

G23

G2G1

G9 G8

G7 G6

G4 G3

BP4 BP3

G24

G8 G2

G2: Relay Gear

G23: Timing Belt Drive Gear

BP1: Timing Belt Pulley

TB1: Timing Belt

G10 Relay gear

G11: Timing Belt Drive Gear

BP5: Timing Belt Pulley

TB3: Timing Belt

Development Section

BP6: Timing Belt Pulley

G12: Development Gear

Development Unit

G13: Relay Gear

G14: Toner Supply CL Gear

Toner Supply CL

Toner Supply Unit

G8: Relay Gear

G9: Relay Gear

Cleaning Unit

G3: Fusing Drive Gear

Fusing and Exit Unit

G4: Hot Roller Gear

G7: Relay Gear

G6: Relay Gear

G5: Exit Roller Gear

FT3013/3213 1-9 STM

G15: Registration CL Gear

Registration CL

Registration Rollers

G20: Relay Gear

G17: Relay Roller CL Gear

Relay Roller CL

G16: 2nd Relay Roller Gear

2nd Relay Rollers

Paper Feed Section

BP2: Timing Belt Pulley

G22: Relay Gear

Paper Feed Section

G21: Paper Feed CL Gear

Paper Feed CL

Feed Rollers

G24: Timing Belt Drive Gear

BP3: Timing Belt Pulley

TB2: Timing Belt

BP4: Timing Belt Pulley

G25: Relay Gear

G26: Drum Drive Gear

G18: Relay Gear

G19: 1st Relay Roller Gear

1st Relay Rollers

STM 1-10 FT3013/3213

6. COPY PROCESSES AROUND THE DRUM

2. EXPOSURE

1. DRUM CHARGE

3. ERASE

8. QUENCHING

4. DEVELOPMENT

7. CLEANING

6. PAPER SEPARATION

FT3013/3213 1-11 STM

5. IMAGE TRANSFER

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. 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.

6. 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 pawl help to separate the paper from the drum.

7. CLEANING

The cleaning blade removes any toner remaining on the drum.

8. QUENCHING

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

STM 1-12 FT3013/3213

7. COPY PROCESS CONTROL

Image Density Control

Toner Density Detection

Residual Voltage (Vr) Detection

Between Copies

Grid Voltage

Standard image density grid voltage (--680 V)

+ + + Drum residual voltage

(Vr) correction factor (SP67) +

Auto image density level factor (SP34)

Standard ID sensor grid voltage (--460 V) +

Drum wear correction factor (SP57)

Standard ID sensor grid voltage (--460 V) + Drum wear correction factor (SP57)

0 Volts (Fixed) Exposure lamp turns off --160 Volts (Fixed)

Exposure Lamp

Voltage

Base exposure lamp voltage (Manual or ADS mode) (SP48)

VL correction factor + Reproduction ratio correction factor (FT3213 copier only)

Same as image density control

Development Bias

Voltage

Base bias voltage factor (Manual or ADS mode [SP34])

Image bias voltage adjustment factor (SP37)

+ Drum residual voltage (Vr) correction factor

Note: Base bias voltage at manual ID level 7 can be adjusted by SP50

Depends on ID sensor bias setting (SP33)

Note: For initial 499 copies bias voltage is increased by --20 volts

0 Volts (Fixed) Full erase

Image bias voltage adjustment factor (SP37)

+ Drum residual voltage (Vr) correction factor

Erase Lamp

Depends on paper size and reproduction ratio

ID sensor pattern erase (Vsg detection: Full erase)

(All LEDs ON)

Full erase (All LEDs ON)

NOTE: The boxed items can be adjusted by SP mode.

FT3013/3213 1-13 STM

8. POWER DISTRIBUTION

AC Power (115V)

When this copier is plugged in and the main switch is turned off, ac power is supplied via the ac drive board to the optional anti-condensation heaters. When the front cover and/or the exit cover is open, the cover safety switch completely cuts off power to all ac and dc components. The RAM pack has a back up power supply (dc battery) for the service program mode data and misfeed job recovery.

When the main switch is turned on, the ac power supply to the anti-condensation heater is cut off and ac power is supplied to the ac drive board. The dc power supply board receives wall outlet ac power through the ac drive board.

The dc power supply board converts the wall outlet ac power input to +5 volts, +24 volts, and a zero cross signal, all of which are supplied to the main board.

STM 1-14 FT3013/3213

The main board supplies dc power to all copier dc components. All sensors, switches, thermistors, and the DF interface board (option) operate on +5 volts. The operation panel operates on +5 volts supplied by the main board.

All other dc components including the power relay (RA401) and the main motor relay (RA402) operate on +24 volts.

When the main board receives power, it activates the power relay (RA401) which then supplies ac power to the fusing lamp drive circuit, and the exposure lamp drive circuit on the ac drive board. The fusing lamp drive circuit receives a trigger signal from the main board and the fusing lamp lights. The exposure lamp does not turn on until the main board sends a trigger pulse to the exposure lamp drive circuit.

When the Start key is pressed, the main board energizes the main motor relay (RA402). Then, the main motor and the quenching lamp turn on. When the main switch is turned off, power is cut off to the main board and to RA401, and the optional drum and optics anti-condensation heaters are turned on.

FT3013/3213 1-15 STM

SECTION 2

DETAILED SECTION

DESCRIPTIONS

1. DRUM

1.1 DRUM CHARACTERISTICS

An organic photoconductor (OPC) drum is used in this model. The OPC drum has the characteristics of:

1. Being able to accept a high negative electrical charge in the dark. (The electrical resistance of a photoconductor is high in the absence of light.)

2. Dissipating the electrical charge when exposed to light. (Exposure to light greatly increases the conductivity of a photoconductor.)

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 remains on the drum.

4. Being less sensitive to changes in temperature (when compared to selenium F type drums).

5. During the drum’s life, drum residual voltage gradually increases and the photoconductive surface becomes worn. Therefore, some compensation for these characteristics is required.

FT3013/3213 2-1 STM

1.2 DRUM UNIT

[A]

[E]

[G]

[F]

[C]

[D]

[B]

[C]

The drum unit [A] consists of an OPC drum [B], ID sensor board [C] and a pick-off pawl [D]. When the drum, the pick-off pawl, or the ID sensor is replaced or cleaned, the drum unit must be removed from the copier. Therefore, the drum has a coupling device which is connected to the drum drive gear [E]. The ID sensor connector [F] is used for the ID sensor.

The main motor provides rotation directly to the drum through a series of gears.

The pick-off pawl [D] is always in contact with the drum surface.

[D]

STM 2-2 FT3013/3213

2. DRUM CHARGE

2.1 OVERVIEW

[A]

[B]

[D]

[A]

This copier uses a double wire scorotron and a highly sensitive OPC drum [A]. The corona wires [B] generate a corona of negative ions when the CC/Grid/Bias power pack [C] applies a high voltage. The CC/Grid/Bias power pack also applies a negative high voltage to a stainless steel grid plate [D]. This insures that the drum coating receives a uniform negative charge as it rotates past the corona unit.

[C]

[D]

The exhaust fan, located above the copy exit, causes a flow of air from the upper area of the development unit through the charge corona unit. This prevents an uneven build-up of negative ions that can cause uneven image density. The exhaust fan runs at half speed when in the stand-by condition and at full speed while copying.

The exhaust fan has an ozone filter (active carbon) which adsorbs ozone (O3) generated by the charge corona. The ozone filter decreases in efficiency over time as it adsorbs ozone. The ozone filter should be replaced at every 80K copies.

The flow of air around the charge corona wires may deposit paper dust or toner particles on the corona wire. These particles may interfere with charging and cause low density bands on copies. To help prevent this, a wire cleaner cleans the corona wire when the operator slides the corona unit out and in.

FT3013/3213 2-3 STM

2.2 CHARGE CORONA WIRE CLEANER MECHANISM

[B]

[A]

[D]

Pads [A] above and below the charge corona wires clean the wires as the charge unit is manually slid in and out.

The cleaner pad bracket [B] rotates when the charge unit is fully extended and the bracket is pulled up against the rear endblock [C]. This moves the pads against the corona wires (see illustration). If the charge unit is not fully extended, the pads do not touch the corona wires.

The pads move away from the wires when the charge unit is fully inserted and the cleaning bracket is pushed against the front endblock [D].

After copier installation the key operator should be instructed to use this mechanism when copies exhibit white streaks, (low image density bands).

[C]

STM 2-4 FT3013/3213

2.3 CHARGE CORONA CIRCUIT

CN1-1 CN1-2 CN1-3

CN1-5

CN1-7

Power Pack CC/Grid/Bias (P1)

PWM Duty cycle

=t2/t1 x 100 (%)

Charge Corona

Development Bias

Grid

VA [24]

VC [5]

CC Trig [ 24]

Grid Trig (PWM) [ 0→0/5]

GND [0]

Main Board (PCB 1)

CN119-7 CN119-6 CN119-5

CN119-3

CN119-1

The main board supplies +24 volts to the CC/Grid/Bias power pack at CN1-1 as the power supply source. After the Start key is pressed the CPU drops CN1-3 from +24 volts to 0 volts. This energizes the charge corona circuit within the CC/Grid/Bias power pack, which applies a high negative voltage of approximately --7.0 K volts to the charge corona wires. The corona wires then generate a negative corona charge.

The grid plate limits the charge voltage to ensure that the charge does not fluctuate and that an even charge is applied to the drum surface.

The grid trigger pulse applied to CN1-5 is a pulse width modulated signal (PWM signal). This signal is not only a trigger signal, it also changes the voltage level of the grid. As the width of the pulse applied increases (see arrow in above illustration), the voltage of the grid also increases (becomes more negative).

FT3013/3213 2-5 STM

+ 70 hidden pages

Ricoh FT3313, FT3113, FT3013, FT3213 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual