Ricoh df54 Service Manual

1. SPECIFICATIONS

Original Size and Weight: - Thin original mode -

Maximum A3 / 11" x 17" Minimum B6 / 51/2" x 81/2" Weight 41 to 128 g/m2 (11 to 34 lb)

- Thick original mode Maximum A3 / 11" x 17" Minimum B6 / 51/2" x 81/2" Weight 52 to 128 g/m2 (14 to 34 lb)

- Auto reverse mode Maximum A3 / 11" x 17" Minimum B6 lengthwise /

51/2" x 81/2" lengthwise

Weight 64 to 105 g/m2 (17 to 28 lb)

Original Feed: Automatic feed — ADF mode

Manual feed one by one — SADF mode

1 January 1990

Original Table Capacity: 30 sheets / 80 g/m2 (20 lb) Original Set: Face up. First sheet on top Original Transport: One flat belt Copy Speed: 12 copies/minute for A4 / 81/2" x 11" sideways Power Consumption: 20 W Dimensions (W x D x H): 670 x 460 x 103 mm (26.4" x 18.1" x 4.1") Weight: Approximately 8.8 kg (19.4 lb)

7-1

1 January 1990

2. COMPONENT LAYOUT (NC100)

- Mechanical Components -

1. Pulse Generator Disk 6. Inverter Pawl

2. Friction Belt 7. Inverter Roller

3. Pick-up Lever 8. Transport Belt

4. Original Table 9. Pick-up Roller

5. Exit Roller 10. Feed Roller

- Electrical Components -

1. Original Set Sensor

2. Registration Sensor

3. Pulse Generator Sensor

4. Original Width Sensor

5. Pick-up Solenoid

6. Belt Drive Motor

7. Indicator Panel

8. Lift Switch

9. DF Main Board

10. Feed-out Motor

11. Inverter Solenoid

12. Feed-out Sensor

13. Original Select Switch

14. Feed-in Solenoid

7-2

1 August 1988

2. COMPONENT LAYOUT (FT2260)

- Mechanical Components -

1. Pulse Generator Disk

2. Friction Belt

3. Pick-up Lever

Original Table

5. Exit Roller

- Electrical

1. Original Set Sensor

2. Registration Sensor

3. Pulse Generator Sensor

4. Original Width Sensor

5. Pick-up Solenoid

6. Belt Drive Motor

7. Indicator Panel

8. Interface Board

6. Inverter Pawl

Inverter Roller

8. Transport Belt

9. Pick-up Roller

10. Feed Roller

9. DF Power Supply Board

10. Lift Switch

11. DF Main Board

12. Feed-out Motor

13. Inverter Solenoid

14. Feed-out Sensor

15. Original Select Switch

16. Feed-in Solenoid

8-2

1 January 1990

3. ELECTRICAL COMPONENT DESCRIPTIONS

Symbol Name Function Location

Motors

M1 Belt Drive Motor DC servomotor that drives to the transport

belt and feed-in system (pick-up roller, feed roller, pull-out roller and relay roller).

M2 Feed-out Motor DC servomotor that drives the feed-out unit

of the DF.

Solenoids

SOL1 Pick-up Solenoid Energizes to press the pick-up lever against

the stack of originals in preparation for original feed-in.

SOL2 Feed-in Solenoid Turns on to engage the feed-in clutch so ro-

tation is transmitted to the feed roller, pullout rollers, and relay rollers.

SOL3 Inverter Solenoid Energizes to invert the original when copy-

ing two sided originals.

Switches

SW1 Lift Switch Informs the CPU when the DF is lifted and

also serves as the jam reset switch for the DF.

SW2 Original Select

Switch

Selects thick original mode or thin original mode.

Sensors

S1 Original Set Sen-

sor

S2 Registration Sen-

sor

S3 Original Width

Sensor

S4 Pulse Generator

Sensor

S5 Feed-out Sensor Checks for original misfeeds and sets origi-

Informs copier CPU that originals have been placed and causes the Insert Original indicator to go out.

Sets original stop timing and measures original length.

Determines the width of the originals. 4

Generates pulses used to measure the original length.

nal stop timing when in auto reverse mode.

7-3

1 January 1990

Symbol Name Function Location

Printed Circuit Boards

PCB1 DF Main Board Controls all DF functions. 9 PCB2 Indicator Panel

Board

Contains operator indicators. 7

7-4

1 January 1990

4. OVERALL MACHINE CONTROL (NC100)

Copier

Main PCB

DF Main Board

RXD

TXD

RXD

ROM

CPU

Driver IC

Sensors Switches

Solenoids Indicators

Belt Drive Motor

Feed-out Motor

The DF CPU monitors the input signals from the sensors and switch es, a nd energizes the solenoids and the indicator LEDs directly. The belt drive motor and the inverter motor are controlled by the DF CPU through their respective driver ICs. The exchanged signals are shown in the tables on the next page.

7-5

1 August 1988

4. OVERALL MACHINE CONTROL (FT2260)

The DF CPU monitors the input signals from the sensors and switches, and energizes the solenoids and the indicator LEDs directly. The belt drive motor and the inverter motor are controlled by the DF CPU through their respective driver ICs.

Also, the DF CPU communicates with the copier using a serial interface. The

exchanged signals are shown in the tables on the next page.

8-5

1 June 1990

4. OVERALL MACHINE CONTROL (FT4418)

Copier (PCB1) Main Board

RXD

TXD

Interface (PCB6) Board

TXD

RXD

DF Main Board (PCB1)

ROM

CPU

Driver

Sensors Switches

Solenoids Indicators

Belt Drive Motor

Feed-out

Motor

8-4

1 January 1990

1. DF → Copier

No. Signal Name Definition

1 Original Set Originals are set on the original table 2 Copy Start Allows the copier to start copy sequence 3 Lift Up The DF is lifted 4 DF Misfeed Misfeed occurs in the DF

2. Copier → DF

No. Signal Name Definition

1 Feed-in Reque sts th e DF to feed -in th e original 2 Feed-out Requests the DF to feed-ou t the original 3 Invert Original Requests the DF to invert the orig ina l 4 Auto Feed Shifts the DF to the auto feed mode

5 Original Stay

Attempt to use DF but the origina l from th e previous copy run remains on th e exposure glass

7-6

1 January 1990

5. BASIC OPERATION

1. One-sided Original Feed

When an original is inserted face up into the DF, the Inse rt Orig inal indicator light goes out and the DF informs the copier CPU that originals have been set.

When the Start key is pressed, the copier CPU moves the scanner 100 mm away from the left scale an d sen ds the feed-in signal to the DF. On rece ipt of this signal, the DF energizes the pick-up solenoid, the feed-in solenoid, and the belt drive motor in order to feed-in the bottom sheet of the original sta ck onto the exposure gla ss. The pick-up solenoid and the fee d-in solenoid remain energized until the original leading edge rea che s the DF reg istra tio n sensor. The belt drive motor turns off sho rtly af te r the origin al’s tra iling edge passes the DF registration sen sor.

While feeding the original, the DF registra tio n sen sor and the paper width sensor check the origina l size.

Just when the origina l trailing edge has passed the DF registra tion sensor, the DF CPU sends the copy start signa l t o th e cop ier. On receipt of the signal, the copier CPU carries out the origin al ID mea surement while returning the scan ne r to the home position and starts th e copy cycle.

When the scanner reaches the return position, the copier CPU sends the feed-out and the feed-in signals to the DF CPU in order to exchange the original with the next original. At this time, the scanner be gin s retu rnin g to the home position, but stays 100 mm away from th e lef t scale until the next original is on the exposure gla ss. At this time the original ID measurement is taken.

When the scanner comes to th e ret urn position after scanning the last original, the copier CP U only sen ds the feed-out signal in ord er to feed-out the last original.

7-7

1 January 1990

2. Two-sided Original Fee d

Unlike one-sided original feed, the back side of the original must be copied first to keep the originals and copies in the correct order.

During original feed-in, the sequence is the same as fo r one-side d feed ; however, the DF CPU also energizes the in vert er mot or an d th e inverter solenoid a short time af te r t he origin al trailing edge has passed the DF registration senso r. The be lt drive motor continues to fee d th e original until the original leading ed ge passe s the fee d-o ut sensor. At this point th e inverter mechanism inverts the origin al, in prep aration for copying the ba ck side. Then the belt drive motor reverses and the original is fed towa rds th e left scale and is aligned against the scale. The DF CPU sen ds th e copy st art signal a short time afte r the origin al trailing edge has passed th e fe ed -out sensor.

When the scanner reaches the return position, the copier CPU sends the invert original signal to the DF CPU in order to make a copy of the front sid e. The original is inverted in the same way as for back side copying.

3. Semi-automatic Document Feed

If a single original is inserte d int o the original table and cop ied, the DF shifts to the semi-automatic feed mode and light s the Auto Fee d ind icat or. The Auto Feed indicator remains on for five secon ds after the copier main motor stops. If another origina l is inserted within that five-secon d period, it is automatically fed and copied.

7-8

6. POWER DISTRIBUTION (NC100)

DF Main Board

CN808

1 January 1990

Copier DC Power

PCB

CN101-3

+5V

+12V

Regulator

The DF uses three DC power levels: +24 volts, +12 V, and +5 V. The AC power from the wall outlet is supplied to t he DC power PCB o f th e

copier. The DC power PCB generates two DC voltages: +24V, +5V, and it supplies power to the DF main board.

The regulator IC on the DF main board further steps down the +24V to +12V.

CN101-2 CN101-1

CN101-4

-4

-2

-1

-3

CN302-9

-10

304-8

301-14

GND GND

[5]

[24]

7-9

6. POWER DISTRIBUTION (FT2260)

1 August 1988

The DF uses three dc power levels: +24 volts, +12 volts, and +5 volts. The line voltage is applied to the DF power supply board where it is stepped

down and rectified to +24 volts and +5 volts. Then, those two dc voltages are supplied to the DF main board.

The regulator IC on the DF main board further steps down the +24 volts to

+12 volts.

8-9

1 June 1990

6. POWER DIST RIBUTION (FT4418)

AC Drive Board

(PCB2)

115Vac

220/240Vac

Optional

Transformer

(TR2)

26Vac

10Vac

Optional

DC Power

Supply Board

(PCB5)

+24V (VA)

+5V (VC)

+12V+24V

Regulator

DF Main Board

(PCB1)

The DF uses three DC power levels: +24 volts, +12 V, and +5 V. When the main switch is turned on, the optional transformer receives the wall

outlet ac power through the ac drive board and outputs 10 volts ac and 26 volts ac to the optional dc power supply board. The optional dc power supply board then converts the 10 volts ac input to +5 volts dc and the 26 volts ac input to +24 volts. Then, thoes two dc voltsges are supplied to the DF main board.

The regulator IC on the DF main board further steps down the +24V to +12V.

8-8

1 August 1988

7. INTERFACE CIRCUIT (FT2260)

The Copier CPU and the DF CPU communicate via the interface board and fiber optics. The interface board changes the optical signals to electrical signals (only vice versa).

8-10

7. INTERFACE CIRCUIT (FT4418)

1 June 1990

Copier Main Board (PCB1)

+5V CN206

+5V

TXD

CPU

+5V

RXD

CN133-A14

CN133-B14

CN106-4

CN106-3

CN133-A1

CN133-B1

Interface Board (PCB6) DF Main Board (PCB1)

CN201-A14

CN201-B14

CN201-A3

CN201-B3

CN201-A1

CN201-B1

Fiber Optics

CN106

TXD

RXD

The copier CPU and the DF CPU communicate via the interface b oa rd and fiber optics. The interface board changes the optical signals to electrical signals (and vice versa).

CPU

8-9

1 January 1990

7. ORIGINAL FEED

7.1 ORIGINAL PICK-UP

[C]

[A]

[B]

[D]

[A]

After setting the origina ls on th e orig ina l tab le, the origin als con ta ct th e feeler [A] of the original se t sen sor an d cau se the feeler to move out of th e sensor. The DF then sends the orig ina l set signal to the copier CPU to inf orm it th at the DF will be used. When the Start key is presse d, the pick-up solenoid [B] is energized. The original sta ck is then presse d between the pick-up lever [C] and pick-up roller [D]. The rotation of the pick-up roller advances th e bo tt om original.

7-10

7.2 ORIGINAL SEPARATION

[B]

1 January 1990

[A]

[B]

[C]

[A]

The feed roller [A] and the friction belt [B] are use d to fee d-in and sepa rat e the originals [C]. Only the bottom orig inal is fed because the friction belt prevents any other origin als fro m f eeding.

Original feed starts when the feed roller starts turning and advances the bottom original of the stack. The fee d roller mo ves th e original past the friction belt because the driving force of the feed roller is great er than the resistance of the frict ion belt . Th e frict ion belt prevents multiple feeds because the resistance of the frict ion belt is great er th an the frictio n be twe en original sheets.

7-11

1 January 1990

7.3 ORIGINAL FEED-IN MECHANISM

[B]

[E]

[C]

[D]

[A]

[F]

The belt drive motor [A] drives the pick-up roller [B], the feed ro ller [C] , the pull out roller [D], the relay roller [E], and tra nsp ort belt [F] via a feed clutch and a gear train.

The pick-up and feed-in soleno ids are ene rgize d 10 0 milliseco nd s aft er th e Start key of the copier is pressed. Then 100 milliseconds afte r t he solen oids are energized, the belt drive motor starts turning. The pulse gene rat or disc [G] always turns when the belt drive motor is on.

Slightly after the original trailing edge passes the reg istra tio n sen sor, the relay rollers and the transport belt sto p turnin g.

7-12

1 January 1990

This document feed er ha s two dif ferent ways of stopping originals at the correct position on the exposu re gla ss. They are called the "thin original mode" and the "thick original mode". The mode used is dete rmine d by the original select switch [A].

[A]

- Original Select Switch -

1. Thin Original Mode The original is stopped at th e correct position on the exposure glass based

on encoder pulse count. The belt drive mo to r stop s short ly a ft er th e original trailing edge passes the DF registra tio n sensor. (Exact timing depends on registration adjustme nt.) Thin original mode is selected at the fact ory.

2. Thick Original Mode When thick original mode is selecte d, the belt drive mot or rema ins en erg ized

for an additional 30 encod er pu lses as comp ared to thin original mode. Then, the belt drive motor pauses and reverse s f or 21 pulse s. This f orce s the original against the left scale and thu s align s the edge of the origin al with the scale.

After the exposu re cycle is completed, the copier send s the fee d-out signal to the DF CPU and the belt drive and feed out motors start turning. At this time , the copied original f ee ds out an d the next original feeds in.

7-13

1 January 1990

7.4 ORIGINAL SIZE DETECTI O N

[B]

[A]

The DF determines original size (bot h widt h and len gt h) th rou gh the use of the original width sensor [A], registration sensor, and pulse gene rat or sen sor [B]. The original’s length is calculated by countin g the numbe r of pulses fro m the pulse generator while th e reg istration sensor is on.

Original size detection is necessary for the feed-in /feed-out timing of the DF.

7-14

+ 49 hidden pages

Ricoh df54 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. SPECIFICATIONS

2. COMPONENT LAYOUT (NC100)

3. ELECTRICAL COMPONENT DESCRIPTIONS

4. OVERALL MACHINE CONTROL (NC100)

5. BASIC OPERATION

6. POWER DISTRIBUTION (NC100)

7. ORIGINAL FEED

7.1 ORIGINAL PICK-UP

7.2 ORIGINAL SEPARATION

7.3 ORIGINAL FEED-IN MECHANISM

7.4 ORIGINAL SIZE DETECTI O N