Ricoh ap305 Service Manual ap306e

FRESA WIN+

(Machine Code: G047/G048)

SERVICE MANUAL

[Engine]



IMPORTANT SAFETY NOTICES

PHYSICAL INJURY PREVENTION

1. Before disassembling or assembling parts of the printer and peripherals,
make sure that the power cord is unplugged.

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

3. Note that some printer components are supplied with electrical voltage even
if the main switch is turned off.

4. If an adjustment or operation check must be made requiring the removal or
opening of the exterior covers while the main switch is on, keep hands away
from electrified or mechanically driven components.

5. The printer drives some of its components when it completes the warm-up
period. Keep hands away from mechanical and electrical components when
the printer starts operation.

6. The interior and metal parts for the fusing unit become extremely hot while
the printer is operating. Do NOT touch these components with bare hands.

HEALTH SAFETY CONDITIONS

1. Never operate the printer without ozone filters installed.

2. Always replace the ozone filters with the specified replacement at the
specified maintenance intervals.

3. Toner is non-toxic, but if it gets in your eyes by accident, it may cause
temporary eye discomfort. Remove it with eye drops or flush eyes with
water. If this is unsuccessful, get medical attention immediately.

SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL

1. Do NOT incinerate toner cartridges, development toner magazine (DTM) or
used toner. Toner dust may ignite suddenly when exposed to an open flame.

2. Dispose of used toner bottle and photoconductor unit (PCU) in accordance
with local regulations. (These are non-toxic supplies.)

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

LASER SAFETY

The Center for Devices and Radiological Health (CDRH) prohibits the repair of
laser-based optical units in the field. The optical unit can only be repaired in a
factory or at a location with the requisite equipment. The laser subsystem is only
replaceable in the field by a qualified Customer Engineer. The laser chassis is not
field repairable. Customer engineers are therefore directed to return all chassis and
laser subsystems to the factory or service depot when the optical subsystem
requires replacement.



WARNING
Use of controls, or adjustment, or performance of procedures other than
those specified in this manual may result in hazardous radiation exposure.



WARNING
WARNING: Turn off the main switch before attempting any of the

procedures in the Laser Unit section. Laser beams can
seriously damage your eyes.

CAUTION MARKING:

TABLE OF CONTENTS

1. OVERALL MACHINE INFORMAT ION........................................ 1-1

1.1 SPECIFICATIONS.....................................................................................1-1

1.2 MECHANICAL OVERVIEW.......................................................................1-3

1.3 MAIN UNIT LAYOUT.................................................................................1-3

1.4 SYSTEM BLOCK.......................................................................................1-5

1.4.1 BLOCK DIAGRAM............................................................................1-5

2. DETAILED SECTION DESCRIPTIONS ...................................... 2-1

2.1 DIFFERENT POINTS FROM BASE MODEL (G024)................................2-1

2.1.1 OVERVIEW......................................................................................2-1

2.1.2 FUSING UNIT...................................................................................2-2

2.1.3 OPTICAL UNIT.................................................................................2-2

2.1.4 PAPER FEEDING AND REGISTRATION........................................2-3

2.1.5 PROCESS CONTROL......................................................................2-3

2.1.6 ELECTRICAL COMPONENTS.........................................................2-3

2.2 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY).............................2-4

2.2.1 OVERVIEW......................................................................................2-4

Layout...................................................................................................2-4

Electrical Components..........................................................................2-5

2.2.2 EXIT UNIT........................................................................................2-7

Driving Mechanism...............................................................................2-7

Junction Gate........................................................................................2-7

Exit Cover Open Detection...................................................................2-8

2.2.3 VERTICAL TRANSPORT UNIT........................................................2-9

Driving Mechanism...............................................................................2-9

Paper Feed Detection...........................................................................2-9

Vertical Transport Unit Cover Open Detection....................................2-10

2.2.4 DUPLEX UNIT................................................................................2-11

Driving Mechanism.............................................................................2-11

Reverse Mechanism...........................................................................2-11

Jogging Mechanism............................................................................ 2-12

Feed-out .............................................................................................2-12

Reverse Tray Detection......................................................................2-12

2.2.5 INTERLEAF....................................................................................2-13

Paper Path for Duplex Printing ...........................................................2-13

Print Order for Duplex Black & White Printing.....................................2-14

Print Order for Duplex Color Printing..................................................2-14

3. INSTALLATION PROCEDURE................................................... 3-1

i

4. SP MODE.................................................................................... 4-1

4.1 OVERVIEW...............................................................................................4-1

4.2 ENGINE SP MODE...................................................................................4-1

4.2.1 OVERVIEW......................................................................................4-1

To enter and exit engine SP mode .......................................................4-1

Outline of the engine SP mode functions..............................................4-1

4.2.2 MENU OPERATION/DISPLAY.........................................................4-2

4.2.3 MARGIN (REGISTRATION ADJUSTMENT)....................................4-2

4.2.4 PARAMETER...................................................................................4-3

4.2.5 CLEAR MEMORY.............................................................................4-3

4.2.6 SENSOR CHECK.............................................................................4-4

4.2.7 NIP WIDTH.......................................................................................4-5

4.2.8 RESET SC........................................................................................4-5

4.2.9 PROCESS CTRL..............................................................................4-6

4.2.10 TEST PRINT...................................................................................4-6

4.2.11 ID SENSOR PWM (PULSE WIDTH MODULATION)......................4-6

4.2.12 IMAGE ADJUST.............................................................................4-6

4.2.13 OUTPUT CHECK...........................................................................4-7

4.2.14 HIGHLIGHT ADJUSTMENT...........................................................4-8

4.2.15 LUB_INTERVAL

(BELT LUBRICATION INTERVAL ADJUSTMENT)........................4-8

4.2.16 PRIMARY BIAS ADJUSTMENT.....................................................4-9

5. PREVENTIVE MAINTENANCE................................................... 5-1

5.1 PM TASKS ................................................................................................5-1

5.1.1 REPLACEMENT...............................................................................5-1

5.1.2 CLEANING.......................................................................................5-1

5.1.3 INSPECTION....................................................................................5-1

5.2 PM TABLE.................................................................................................5-2

5.2.1 MAIN UNIT.......................................................................................5-2

5.2.2 OPTIONAL PAPER FEED UNIT ......................................................5-2

6. REPLACEMENT AND ADJUSTMENT

(AUTO-DUPLEX MODEL)........................................................... 6-1

6.1 EXTERIOR................................................................................................6-1

6.1.1 TOP OVER.......................................................................................6-1

6.2 PAPER EXIT UNIT....................................................................................6-2

6.2.1 UPPER COVER ...............................................................................6-2

6.2.2 LOWER COVER...............................................................................6-2

6.2.3 PAPER EXIT UNIT...........................................................................6-3

6.2.4 JUNCTION GATE SOLENOID.........................................................6-4

6.3 VERTICAL TRANSPORT UNIT.................................................................6-5

6.3.1 VERTICAL TRANSPORT UNIT COVER..........................................6-5

6.3.2 UPPER, LEFT AND RIGHT SIDE COVER.......................................6-5

6.3.3 VERTICAL UNIT SENSOR...............................................................6-6

6.3.4 VERTICAL TRANSPORT MOTOR...................................................6-6

ii

6.3.5 VERTICAL TRANSPORT UNIT........................................................6-7

6.4 DUPLEX UNIT...........................................................................................6-8

6.4.1 DUPLEX TRAY.................................................................................6-8

6.4.2 REVERSE ROLLER.........................................................................6-9

6.4.3 DUPLEX FEED MOTOR/REVERSE MOTOR................................6-10

6.4.4 DUPLEX FEED SENSOR...............................................................6-10

6.4.5 JOGER HOME POSITION SENSOR.............................................6-11

6.4.6 JOGGER MOTOR/REVERSE SOLENOID.....................................6-12

6.4.7 REVERSE SENSOR......................................................................6-13

6.4.8 TEMPERATURE/HUMIDITY SENSOR..........................................6-13

6.4.9 RELAY MOTOR/RELAY ROLLER..................................................6-14

6.5 FUSING SECTION..................................................................................6-15

6.5.1 FUSING UNIT.................................................................................6-15

6.6 LASER SECTION....................................................................................6-16

6.6.1 CAUTION DECAL LOCATIONS.....................................................6-16

6.6.2 OPTICAL HAUSING UNIT..............................................................6-17

6.7 ELECTRICAL COMPONENTS................................................................6-18

6.7.1 CONTROLLER BOARD.................................................................6-18

6.7.2 DUPLEX DC SUPPLY UNIT...........................................................6-19

6.7.3 POWER SUPPLY UNIT..................................................................6-20

6.7.4 HIGH VOLTAGE SUPPLY UNIT....................................................6-21

6.7.5 MCU ...............................................................................................6-22

6.7.6 DUPLEX DRIVER BOARD.............................................................6-22

7. TROUBLESHOOTING ................................................................ 7-1

7.1 SC TABLES...............................................................................................7-1

7.1.1 TYPES OF SERVICE CALL.............................................................7-1

Fusing Unit SC Errors...........................................................................7-1

7.1.2 SC ERROR LIST..............................................................................7-2

7.1.3 PROCESS CONTRL ERROR LIST..................................................7-6

7.2 USER ERROR LIST...................................................................................7-8

iii

30 June 2000 SPECIFICATIONS

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

Configuration Desk top
Print Process Dry electrostatic transfer system
Resolution 600 dpi
Paper Size Standard tray

Short edge feed (SEF):

A3, 11" x 17", 8
8

" x 13", 8

1/4

Long edge feed (LEF):

A4, 8
5

1/2

1/2

" x 8

" x 11", 7

")

1/2

By-pass feed tray*

Short edge feed:

A3, A6, B4 JIS, B6 JIS, 12" x 18",11" x 17",

8

" x 14", 8" x 13", 8

1/2

Long edge feed:

A4, A5, B5 JIS, 8
Custom size paper (Length: 148 to 457.2 mm,
Width: 90 to 297 mm)

" x 14", Others* (B4 JIS, 8" x 13",

1/2

" x 13")

1/2

" x 10

1/4

1/2

1/2

" x 13", 8

1/4

" x 11", 5

", Others* (B5 JIS, A5,

" x 13"

1/2

1/2

" x 8

1/2

", 7

1/4

" x 10

1/2

Overall

Information

"

* Specify the paper size with the system menu (at the

operation panel by the user).

Paper Weight Standard and optional trays: 64 to 105 g/m2 (17 to 28 lbs.)

By-pass feed tray: 64 to 160 g/

Plain paper mode: 64 to 105 g/m

m2 (17 lbs to 43 lbs

2

)

Thick paper mode: 105 to 160 g/m2, adhesive labels
OHP transparency mode: OHP transparencies

First Printout Time Color: Less than 26 seconds (A4 A4/8

Monochrome: Less than 13 seconds (A4 A4/8

" x 11" LEF)

1/2

1/2

" x 11"

LEF)

Print Speed Simplex prints

Color: 6 ppm (A4/8
Monochrome: 24 ppm (A4/8

" x 11" LEF)

1/2

" x 11" LEF)

1/2

Duplex prints

Warm-up Time

Color: 5.5 ppm (A4/8
Monochrome: 21.7 ppm (A4/8

Less than 380 seconds (at 23°C/73°F)

" x 11" LEF)

1/2

" x 11" LEF)

1/2

Paper Capacity Standard tray: 250 sheets (80 g/m2, 20 lbs.)

By-pass feed tray: 50 sheets (80 g/m2, 20 lbs.)
Optional trays: 500 sheets (80 g/m2, 20 lbs.)

1-1

SPECIFICATIONS 30 June 2000

Paper Output
Capacity

250 sheets (A4/8

" x 11" or less)

1/2

100 sheets (More than A4/8

" x 11")

1/2

Output Method Face down
Power Supply 120 V, 60 Hz, 10 A

220 to 240 V, 50/60 Hz, 5.2 A

Power Consumption Maximum: Less than 1,200 W

Average during printing: Less than 750 W
Stand-by mode: Less than 150 W
Energy saver mode: Less than 45 W

Noise Emission
(Sound Power Level)

Stand-by: Less than 43 dB
Operating: Less than 65 dB

Dimensions Simplex model (G047)

660 x 575 x 475 mm (26” x 22.6” x 18.7”)
(without paper tray)

Auto duplex model (G048)

660 x 652 x 610 mm (26” x 25.7” x 24”)
(without paper tray)

Weight Simplex model (G047)Approximately 62 kg (136.7 lbs.)

(including consumables)

Auto-Duplex model (G048)

Approximately 82 kg (180.8 lbs.)
(including consumables)

Option Paper Feed Unit Type 305 (Paper Tray Unit) – up to two of

these units can be installed

1-2

30 June 2000 MECHANICAL OVERVIEW

1.2 MECHANICAL OVERVIEW

Same as base model (G024)
Refer to the Section 1-2 of base model manual.

1.3 MAIN UNIT LAYOUT

13

1

2

12

11

Overall

Information

10

9

8

1. Paper Transfer Unit

2. Photoconductor Unit (PCU)

3. Paper Tray/Paper Feed Mechanism

4. Development Unit (DTM)

5. Duplex Unit

6. Optical Housing Unit

7. Main Control Unit (MCU)

5

467

G048V101.WMF

8. Vertical Transport Unit

9. High Voltage Supply Unit

10. DC Supply Unit

11. Controller Board

12. Power Supply Unit

13. Fusing Unit

3

1-3

MAIN UNIT LAYOUT 30 June 2000

(1) Optical Housing Unit

• Optical system: 6-sided polygon mirror, F-theta mirror, BTL

• Resolution: 600 dpi

• Modulation method: PM+PWM

(2) MCU

• CPU: XC68334 GFC16

• Engine system control

• Process control

• Video interface

(3) Vertical Transport Unit (Auto-duplex Model Only)

• Paper feeding for duplex printing by rollers

(4) High Voltage Supply Unit

• Constant current: Paper transfer, charge corona wire

• Constant voltage: Charge corona grid, belt transfer, supply roller,

development blade

(5) DC Supply Unit (Auto-duplex Model Only)

• Outputs: +24 VDC supply for duplex unit

(6) Controller Board

• Host interface

• Video interface

• Image processing

• Operation panel control

(7) Power Supply Unit

• Outputs: +5 VDC, +24 VDC, 120/230 VAC

(8) Fusing Unit

• Fusing method: Hot roller method

• Oil application: Application roller method

• Cleaning: Cleaning roller method

• Temperature detection: Thermistor

• Safety precaution: Thermofuse

(9) Paper Transfer Unit

• Transfer: Transfer rol l er met hod

(10) PCU

A unit consisting of the OPC belt and the primary (belt) transfer section.

• OPC belt: 93-mm diameter

• Charging: Single scorotron charge corona wire

• Primary transfer: Transfer belt

• Cleaning: Counter blade

• Lubricant: Zinc stearate

1-4

30 June 2000 SYSTEM BLOCK

(11) Tray/Transport

• Standard tray: Universal tray, friction pad separation
By-pass tray: FRR method

(12) Development Unit

• Development method: Monocomponent non-magnetic toner

• Development unit changeover: Revolver method

• Toner replenishment: DTM change

(13) Duplex Unit

• Stack-less

• Paper side edge jogging

1.4 SYSTEM BLOCK

1.4.1 BLOCK DIAGRAM

ADC

CPU

ROM

ID Sensor

Humidity

Sensor

High Voltage

Supply Board

D/A

PWM

Overall

Information

NVRAM DRAM

IC Card

Sensors

Vertical

Transport

Sensor

PSU

Fusing

Control

I/O

AMDG

MCU

Thermistor

Fusing Unit

: Additional components on deplex model (G048)

Solenoids

Clutches

Interchange

Solenoids

LD

Modulation

Control

DC Supply Unit

ASIC

Video I/FGAVD/PLLC

Printer

Controller

Pattern

Generation

FIFO

Selector

Operation

Panel

Sensor

Motor Solenoids

Motor

Control

Revolver
Main Motor
PCU Motor

Expander

DDB

G048V554.WMF

1-5

30 June 2000 DIFFERENT POINTS FROM BASE MODEL (G024)

2. DETAILED SECTION DESCRIPTIONS

2.1 DIFFERENT POINTS FROM BASE MODEL (G024)

2.1.1 OVERVIEW

The following points are different from the base model (G024).

1. Duplex printing
The following units were added to the Auto-duplex model (G048)

Paper Exit Unit Switching the paper path to the exit or to the duplex unit after

fusing.

Vertical Transport
Unit

Duplex Unit This unit is located at the bottom of the main-body. In this

Interleaf control is used for this model to increase the printing speed.

For duplex printing, feeding a sheet to duplex unit after fusing.
This unit is located behind the main-body.

unit, a sheet is turned, jogged and then fed to the main-body
again. Sheets are fed into this unit one-by-one.

Detailed

Descriptions

2. Printing Speed

Printing Speed G047/G048 Base Model (G024)

Black & White mode 24 ppm 17 ppm
Color mode 6 ppm 5 ppm

First Print G047/G048 Base Model (G024)

Black & White mode 13 sec. 14 sec.
Color mode 26 sec. 30 sec.

3. Image Quality Improvement
Increasing the line frequency in photograph and text mode improves the quality
of the image. A new laser optical unit is used to increase the line frequency.

Line Frequency G047/G048 Base Model (G024)

Photograph 180 lpi 106 lpi
Graphics 106 lpi 106 lpi
Text 268 lpi 211 lpi

2-1

DIFFERENT POINTS FROM BASE MODEL (G024) 30 June 2000

2.1.2 FUSING UNIT

The followings differ from the base model (G024) in the Fusing unit.

1. Pressure Roller
For the duplex printing, The material used to make the pressure roller was
changed from Teflon to Silicon rubber to improve duplex printing performance.

2. Heat Isolation
To maintain the fusing roller temperature, heat isolation bushings are mounted
between the fusing roller bushing and drive gear.

3. Connector
All of the drawer connectors were replaced with harness connectors.

4. Exit Cover Switch (Auto-duplex model only)
The location of paper exit cover switch was moved to the main-body of the
machine from the fusing unit..

2.1.3 OPTICAL UNIT

The following optical unit ite ms differ from the previous model.

1. Polygonal Mirror Motor
The speed of the polygonal mirror motor was increased to increase the printing
speed.

G047/G048 Base Model (G024)

Paper feed speed 121.54 mm/sec 101.27 mm/sec.
Mirror motor revolution

speed

28,706 rpm 23,922 rpm

2. LD Unit
To improve the image quality, the diameter of the beam was decreased and the
power of the beam was increased.

G047/G048 Base Model (G024)

Diameter of Beam
LD Power 1.91 mW 1.58 mW

69 µm x 76 µm 76 µm x 76 µm

3. Dust Prevention
To prevent the polygonal mirror and polygon mirror motor from collecting dust,
two sponges were added to the optical housing. One is above the polygon
mirror motor and the other is on the side of the housing unit.

2-2

30 June 2000 DIFFERENT POINTS FROM BASE MODEL (G024)

2.1.4 PAPER FEEDING AND REGISTRATION

1. Paper size detection of bypass tray
Paper width detection mechanism on the bypass tray is not available.

2. Pick-up roller
The material of pick-up roller is changed to Silicone rubber for duplex printing
from the bypass tray.

2.1.5 PROCESS CONTROL

1. K-DTM Initialization
The image density target level was lowered.

G047/G048 Base Model (G024)

ID on sheet 1.6 1.7
Volume of toner 0.56 mg/cm

2

0.60 mg/cm

2

Detailed

Descriptions

2. Color-DTMs Initialization
The image density target level was changed.

G047/G048 Base Model (G024)

ID on sheet 1.4 1.5
Volume of toner (C) 0.56 mg/cm
Volume of toner (Y) 0.54 mg/cm
Volume of toner (M) 0.62 mg/cm

2

2

2

0.55 mg/cm

0.55 mg/cm

0.60 mg/cm

3. Charge Grid Bias Compensation
Compensation control was changed because the number of lines in photo
mode was changed from 106 to 180.

2.1.6 ELECTRICAL COMPONENTS

1. Main Motor
The main motor was changed to increase the print speed.
The PCU motor was not changed but the clock rate was changed.

2. MCU
The MCU was changed to improve the efficiency of duplex printing by adding
new electrical components.

2

2

2

3. PSU
A different PCU was used to increase the current level.
A DC supply unit was added for Auto-duplex models only.

2-3

DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY) 30 June 2000

2.2 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY)

2.2.1 OVERVIEW

Layout

10

9

8

7

1

2

1. Junction Gate

2. Relay Roller

3. Duplex Roller

4. Duplex Pick-up Roller

5. Jogger Fence

56

G048D101.WMF

6. Duplex Feed Roller

7. Duplex Unit

8. Vertical Transport Roller

9. Vertical Transport Unit

10. Exit Unit

34

2-4

30 June 2000 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY)

Electrical Components

13

15
14

17

16

18

12

11

10

1

8

9

G048D103.WMF

2

3

Detailed

Descriptions

4

5

6

7

1. Vertical Transport Entrance Sensor

2. Vertical Transport Cover Switch

3. Duplex DC Supply Unit

4. Vertical Transport Unit Switch

5. Vertical Transport Motor

6. Temp./Hum. Sensor

7. Duplex Driver Board

8. Relay Motor

9. Duplex Feed Sensor

10. Jogger HP Sensor

11. Jogger Motor

12. Reverse Solenoid

13. Reverse Sensor

14. Duplex Reverse Motor

15. Duplex Feed Motor

16. Vertical Transport Exit Sensor

17. Junction Gate Solenoid

18. Exit Cover Switch

Exit Unit

- A solenoid moves the junction gate.

- A micro-switch detects if the cover is open.

Vertical Transport Unit

- The vertical transport rollers driven by the vertical transport motor feed paper
to the duplex unit.

- Two sensors detect paper fed in the entrance and out the exit of the unit.

- Two micro-switches detect whether the vertical transport unit and cover are
open.

2-5

DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY) 30 June 2000

Duplex Unit

- The duplex, duplex transport and duplex pick-up rollers reverse the paper in
the unit.

- The jogger fence prepares to feed paper into the main body after reversing it.

- The duplex, duplex pick-up, and relay rollers feed paper into the main body for
reverse side printing.

- The duplex feed sensor and reverse sensor detect paper.

2-6

30 June 2000 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY)

2.2.2 EXIT UNIT

Driving Mechanism

[D]

[E]

Detailed

Descriptions

[A]

[B]

[C]

G048D002.WMF

The fusing unit [A] and drive gears [B], powered by the main motor [C], drive the
feed and exit rollers [D and E].

Junction Gate

[A]

[B]

G048D001.WMF

The Junction gate [A] is located at the entrance of exit unit. Paper is fed to the exit
tray or to the vertical transport unit by this gate. This gate is driven by solenoid [B].
When this solenoid activates, the paper is fed into the vertical transport unit.

2-7

DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY) 30 June 2000

Exit Cover Open Detection

[A]

G048D003.WMF

The exit unit cover switch [A] is on the right side of the unit to detect whether the
cover is open. This switch interrupts the 24VDC line to the main control board
(PCB2).

2-8

30 June 2000 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY)

2.2.3 VERTICAL TRANSPORT UNIT

Driving Mechanism

[B]

[D]

[D]

[A]
[C]

G048D501.WMF

The vertical transport motor [A] drives the vertical transport rollers [B] using gears
[C] and timing-belts [D].

Paper Feed Detection

[A]

Detailed

Descriptions

[B]

G048D010.WMF

Two sensors (photo interrupters) detect paper: One is the entrance sensor [A] and
the other is the exit sensor [B].

2-9

DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY) 30 June 2000

Vertical Transport Unit Cover Open Detection

[A]

G048D008.WMF

G048D007.WMF

The interruption of the current for the vertical transport switches [A and B]
determines whether the vertical transport unit or cover is open.

[B]

2-10

30 June 2000 DUPLEX PRINTING (AUTO-DUPLEX MODEL ONLY)

2.2.4 DUPLEX UNIT

Driving Mechanism

[A]

[B]

G048D502.WMF

Detailed

Descriptions

The duplex feed motor [A] feeds paper from the vertical transport unit up to the
reverse tray. Then the duplex reverse motor [B] feeds the paper from the reverse
tray to the relay rollers.

Reverse Mechanism

[A]

First, paper is fed by the duplex feed
rollers [A] and then by the duplex rollers
[B]. When the reverse sensor [C] detects
the leading edge of paper, the reverse
solenoid [D] activates and paper is fed
into the duplex tray [E].
When the reverse sensor detects the
trailing edge of paper, the reverse
solenoid deactivates.

[B]

[D]

[C]

2-11

[E]

G048D015.WMF