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3
MAIN BODY (J ~ T)
Toner Supply Unit .......................................... 3-J-1 [1] Composition ......................................... 3-J-1 [3] Disassembly and Re-assembly ............ 3-J-2 [4] Toner Level Detection Control ............. 3-J-3 Cleaning/Toner Recycle Unit ........................ 3-K-1 [1] Composition ........................................ 3-K-1 [2] Mechanisms ........................................ 3-K-1 Paper Feed Unit ............................................ 3-L-1 [1] Composition ........................................ 3-L-1 [2] Mechanisms ........................................ 3-L-1 [3] Disassembly and Re-assembly ........... 3-L-3 [4] Paper Feed Control ........................... 3-L-10 [5] Paper Up-down Control .................... 3-L-12 [7] No Paper Detection Control .............. 3-L-14 LCT-1000 Tray Paper Feed/ Conveyance Section .................................... 3-M-1 [1] Composition ....................................... 3-M-1 [3] Disassembly and Re-assembly .......... 3-M-2 [4] 1000 Tray Paper Feed/No Paper Detection Control ............................... 3-M-4 LCT-1500 Tray Paper Feed/ [1] Composition ........................................ 3-N-1 [2] Mechanisms ........................................ 3-N-1 [3] Disassembly and Re-assembly ........... 3-N-2 [4] 1500 Tray Paper Feed/No Paper Detection Control ................................ 3-N-3 LCT Paper Tray SECTION ........................... 3-O-1 [1] Composition ........................................ 3-O-1 [2] Mechanisms ........................................ 3-O-1 [3] Disassembly and Re-assembly ........... 3-O-2 [4] Tray up-down Control ......................... 3-O-5 [1] Composition ........................................ 3-P-1 [2] Mechanisms ........................................ 3-P-1 [3] Disassembly and Re-assembly ........... 3-P-2 [4] Selector Guide .................................... 3-P-2 [5] M152 (ADU cooling fan) Control ......... 3-P-3 [1] Composition ........................................ 3-Q-1 [2] Mechanisms ........................................ 3-Q-1 [3] Disassembly and Assembly ................ 3-Q-3 [4] Paper Feed/Reversal Control ............. 3-Q-3 [5] Conveyance Control ........................... 3-Q-5 [6] ADU Mis-centering Detection Control . 3-Q-6 [1] Composition ........................................ 3-R-1 [2] Mechanisms ........................................ 3-R-1 [3] Disassembly and Re-assembly ........... 3-R-2 [4] FM14 (conveyance suction) Control ... 3-R-3 [1] Composition ........................................ 3-S-1 [2] Mechanisms ........................................ 3-S-1 [3] Disassembly and Re-assembly ........... 3-S-2 [4] Fixing Temperature Control .............. 3-S-11 [1] Parts Through Which Current Flows When the Main Switch is Turned OFF 3-T-1 [2] Parts That Operate When the Main Switch is Turned ON .................. 3-T-1 [3] Cooling Fan Control ............................ 3-T-2 [4] Operation Panel Control ..................... 3-T-4 [5] Counter Control ................................... 3-T-6 [6] Option Control ..................................... 3-T-7 [2] Mechanisms ......................................... 3-J-1 ADU Paper Exit/Conveyance Section ........... 3-P-1 [3] Disassembly and Re-assembly ........... 3-K-1 ADU Paper Feed/Conveyance Section ........ 3-Q-1

[6] Paper Size Detection Control ............ 3-L-13 CONVEVANCE SECTION ............................ 3-R-1

[2] Mechanisms ....................................... 3-M-1 Fixing Unit ..................................................... 3-S-1

Conveyance Section ..................................... 3-N-1 Other Kinds of Control .................................. 3-T-1

TONER SUPPLY UNIT

TONER SUPPLY UNIT
[1] Composition

Toner supply door Toner box

Toner supply motor (M10)

Toner level detecting sensor (TLD)

Shutter Toner conveyance screw

[2] Mechanisms
Mechanism *1 Toner supply Toner level detection Toner agitating Toner box *2 Toner leakage prevention Method Screw conveyance Piezoelectric method 185g±50g Agitator plate Capacity 1330g Toner supply shutter

*2: Toner supply shutter
When installing the toner cartridge, move forward the toner supply unit. This causes the toner supply port to close, preventing leakage of toner. When you return the toner supply unit to the main body (normal position), the toner supply port coincides with the developing unit.

*1: Toner supply
a. The rotational force of the toner supply motor is transmitted via gears to the toner conveyance screw and the toner agitator shaft, causing the shaft to rotate. The toner that has been agitated by the agitator plate installed on the toner agitator shaft is supplied to the developing unit.

b.

Shutter Toner supply port

3-J-1

TONER SUPPLY UNIT

[3] Disassembly and Re-assembly
1. Removing and Re-installing the Toner Supply Unit
a. Procedure (1) Open the front door, slacken the set screw, release the lock of the toner supply unit, then pull forward the toner supply unit. (2) Slacken the set screw shown at top left of the figure, and remove the set screw shown at bottom right, then remove the cover of the toner supply unit.

(4) Close the toner supply unit, then remove the E ring. (5) Pull out the shutter toward the bottom, then remove the toner supply unit.

E ring

Shaft Set screw

Set screw Toner supply unit cover

(6) Re-install the toner supply unit in the opposite sequence to removal.

(3) Disconnect the two connectors (CN17 and 14).

Connector (CN17)

Connector (CN14)

3-J-2

TONER SUPPLY UNIT

[4] Toner Level Detection Control

12VDC 22-B3 TLD 22-B4 SGND 22-B5

TLD

OB CLOCK 3-B3 OB DATA 3-B4 OB LATCH 3-B5

212-4 212-5 212-6

OB1

CB

Toner level detection control is done by the TLD (toner level detecting sensor) and the CB (control board).

1. Operation
a. Toner level detecting sensor A piezoelectric device is used as the TLD. When the level of toner in the toner box becomes low, the "supply toner" signal is output to the CB. As a result, a message is displayed on the LCD (VFD1, VRD2) connected to OB2 (operation board 2). b. Detection timing The detection timing is as follows. * When the machine is switched ON * When the front door is opened and closed * During a copy operation

2. Signals
a. Input signal (1) TLD (TLD CB) When the level of toner in the toner box becomes low, this signal becomes [L], and a message is displayed on the LCD connected to OB2.

3-J-3

CLEANING/TONER RECYCLE UNIT

CLEANING/TONER RECYCLE UNIT
[1] Composition

Toner recycle screw

Cleaning blade

C

guide roller

Toner conveyance screw Cleaning blade Toner conveyance screw

[2] Mechanisms
Mechanism Drum cleaning
C

3. Method Cleaning blade (weight type) Screw conveyance to the developing unit Toner guide roller

C

Toner recycle Toner collection

[3] Disassembly and Re-assembly
1. Removing and Re-installing the Cleaning Blade
Caution: Be sure that the power cord has been unplugged from the power outlet. Caution: 1. Do not touch the edge of the cleaning blade with bare hands. 2. When installing the drum, cleaning blade and guide roller, coat the entire surface of the drum and also the cleaning blade with setting powder, regardless of whether the drum and cleaning blade are new or old type parts. Also, apply toner to both edges of the cleaning blade.

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4.

Once the drum has been coated with setting powder, carry out the following work before installing the drum unit on the main body. 1) To ensure that the toner density is correct, before installing the drum to the drum unit, discharge the surface of detection sensor and the Dmax sensor on the control board by using a piece of cloth moistened with alcohol, thus preventing toner from adhering to the sensors. 2) After installing the drum to the drum unit,with the charging corona unit and the developing unit removed, insert the centering jigs into both sides of the drum, then turn the drum one revolution. This prevents setting powder from scattering onto the charging corona unit and also prevents image defects. Take care that the blade spacer mounted on the cleaning blade shaft at the back does not drop out.

3-K-1

CLEANING/TONER RECYCLE UNIT

C

1)

To ensure that the toner density is correct, before installing the drum to the drum unit, discharge the surface of detection sensor and the Dmax sensor on the control board by using a piece of cloth moistened with alcohol, this preventing toner from adhering to the sensors. Pay attention not to drop the blade spacer which is inserted to cleaning blade atis on the back side.

(4) Remove the blade shaft retainer. Caution: Take care that the blade spacer does not drop out. (5) Lift out the blade mounting plate.

5.

Blade mounting plate

Blade spacer

Note: Before removing the drum, in order prevent the toner from dropping, rotate cleaner idler gear B/ counterclockwise and remove the toner remaing between the drum and the guide roller.If the toner cannot be removed, rotate the drum clockwise a bit, then detach the drum keeping the toner in the place. a. Procedure (1) Open the front door, then remove the drum unit. (2) Remove the charging corona unit. (3) Remove the two set screws, then remove the cleaner cover.
Blade shaft retainer

Cleaner cover

(6) Remove the set screw, then remove the cleaning blade from the blade mounting plate.
C

Cleaning blade Blade spacer

Set screws

Blade mounting plate Set screw

(8) Re-install the cleaning blade in the opposite sequence to removal.

3-K-2

CLEANING/TONER RECYCLE UNIT

2. Removing and Re-installing the Guide Roller
Caution: 1. When installing the guide roller, it is necessary to set the drum accurately in the center position. When the drum used in this machine is removed, the drive shaft remains in the main body, hence it is necessary to center the drum using the two jigs inside the drum cover.

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Note: Before removing the drum, rotate cleaner idler gear B counterclockwise in order to prevent toner from dropping to the bottom of the unit, and also remove any toner between the drum and the guide roller.If the toner cannot be removed, rotate the drum clockwise a bit, then detach the drum with keeping the toner in the place. (3) Remove cleaner idler gear B and the two springs.

Jig (small) Jig (large) Cleaner idler gear B

Springs Drum cover

C

C

When installing the drum, cleaning blade and guide roller, coat the entire surface of the drum and also the cleaning blade with setting powder, regardless of whether the drum and cleaning blade are new or old type parts. Also, apply toner to both edges of the cleaning blade. 3. Once the drum has been coated with setting powder, carry out the following work before installing the drum unit on the main body. 1) To ensure that the toner density is correct, before installing the drum to the drum unit, discharge the surface of detection sensor and the Dmax sensor on the control board by using a piece of cloth moistened with alcohol, thus preventing toner from adhering to the sensors. 2) After installing the drum to the drum unit, with the charging corona unit and the developing unit removed, insert the centering jigs into both sides of the drum, then turn the drum one revolution. This prevents setting powder from scattering onto the charging corona unit and also prevents image defects. a. Procedure (1) Remove the drum unit. (2) Remove the charging corona unit, blade mounting plate, developing unit and drum from the drum unit.

2.

(4) Remove the left and right set screws (one each), then remove the left and right shaft positioning pieces. (5) Lift out the guide roller.

Set screw Guide roller

Shaft positioning piece

Shaft positioning piece Set screw

3-K-3

CLEANING/TONER RECYCLE UNIT

C

(6) Clean any toner that has dropped off the guide roller. (7) Install the guide roller and the two shaft positioning pieces, then fix them temporarily with the two set screws.

Drum

Jig (large)

Jig (small)

C

C

(8) Install the drum by following the instruction given in 1 ) of 3, then insert the centering jigs into both sides of the drum. (9) Install the two springs, bring the guide roller into contact with the drum, then fix the guide roller securely by fully tightening the two screws that you fixed temporarily. (10) Install the cleaning blade.(Refew to the dis-assembly and assembly of the cleaning blade in this manual.) (11) Rotate the drum 1 revolution by follewing the instruction given in 2) of 3. (12)Remove the centering jigs from both sides of the drum, then store them inside the drum cover. (13) Install the charging corona unit and developing unit. (14) Install the drum unit to the main body.

3-K-4

PAPER FEED UNIT

PAPER FEED UNIT
[1] Composition

2nd paper feed clutch By-pass feed roller By-pass feed roller Double feed prevention roller

2nd paper feed roller

Feed roller

Upper tray motor

By-pass plate

Paper feed motor

Paper feed roller Double feed prevention roller Paper feed roller Feed roller

Lower tray motor

By-pass paper feed solenoid By-pass clutch Paper feed clutch (upper) Conveyance clutch Paper feed clutch (lower)

Double feed prevention roller 1st paper feed solenoid (upper)

1st paper feed solenoid (lower) Paper lift-up plate Paper lift-up plate

[2] Mechanisms
Mechanism Paper stack *1 Paper lift pressure reduction *2 Paper lift-up Double feed prevention *3 Cassette loading 1st paper feed Method Tray (2-stage) Swivel roller Paper lift-up plate Torque limiter Front loading Feed roller, 1st paper feed solenoid Mechanism 2nd paper feed Multi tray paper feed *4 Paper size detection Method Registration roller, 2nd paper feed clutch Feed roller, by-pass paper feed solenoid Cassette detection switch (upper cassette: tact switch, (lower cassette: Write paper size to memory.) Index sheet

*5 Remaining paper indication

3-L-1

PAPER FEED UNIT

*1: Swivel roller
The paper feed direction and the cassette loading direction are at right angles to each other. Consequently, if the feed roller is fixed, it will touch the paper when the cassette is removed, resulting in possible paper jamming. To prevent this, the swivel roller (paper feed roller) is designed so that it drops down and touches the paper only when paper feed is taking place.

*3: Paper up-down base release operation
When the tray is being removed, the projection on the right side of the tray strikes the paper up-down base release lever, causing the paper lift-up gear to be disengaged by the gear coupling lever. As a result, the up-down base falls under its own weight.

Paper feed swivel plate

Paper feed roller

Paper feed solenoid Tray projection Up-down base release lever

*2: Paper lift-up
When the paper feed tray is installed, the paper lift-up plate is moved by the tray motor, paper feed idler gear and the paper lift-up gear, causing the paper in the tray to be fed automatically to the paper feed position.

*4: Paper size detection
The side guide and rear guide of the upper tray move, causing the paper size detection knob to move as well. As a result, the switch on the detection board is turned ON/ OFF. In this way, paper size detection takes place automatically.

Swivel roller

Paper

Paper lift-up plate Paper size detection knob

3-L-2

PAPER FEED UNIT

*5: Remaining paper indication
The amount of paper remaining in the tray can be checked roughly by looking through the remaining paper indicator window. The remaining paper detection lever moves along with the up-down motion of the tray, and the index sheet is caused to slide by a tension spring.
C

[3] Disassembly and Re-assembly
1. Removing and Re-installing the Paper Feed Unit
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Open the front door, then pull out the upper/lower tray in the forward direction. (2) Slacken the five set screws, then remove the right side upper cover. (3) Slacken the two screws, then remove the right side lower cover.

Tension spring Tray

C

Set screws Index sheet Remaining paper detection lever Set screws

Set screw (behind by-pass feed) Right side upper cover

Right side lower cover

(4) Disconnect the two connectors (CN7 and CN44) connected to the control board, and also the intermediate connector (CN33), then remove the paper feed wiring from the cord clamp. (5) Remove the four set screws, then remove the paper feed unit.

Set screws

Set screws

Connector (CN44)

Paper feed and conveyance door Connector (CN33)

Connector (CN7)

(6) Re-install the paper feed unit in the opposite sequence to removal.

3-L-3

PAPER FEED UNIT

2. Removing and Re-installing the By-pass Feed Base
a. Procedure (1) Remove the paper feed unit. (2) Remove the set screw and by-pass feed base shaft bearing, then remove the by-pass feed base.

(4) Remove the each E ring, then pull out each roller from the shaft. (5) Remove the rubber from each roller (paper feed rubber and paper supply rubber).

By-pass paper feed MC By-pass feed base

Paper feed rubber By-pass paper feed roller E ring

By-pass feed base shaft bearing

Paint mark

Paper supply rubber By-pass feed roller Set screw

(3) Re-install the by-pass feed base in the opposite sequence to removal.

(6) Re-install each rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on each rubber.)

3. Replacing the Rubber of the By-pass Feed Roller/By-pass Paper Feed Roller
a. Procedure (1) Remove the paper feed unit. (2) Disconnect the connectors of the by-pass paper feed MC and the by-pass no paper detecting PS (CN233 and 47). (3) Remove the set screw, then remove the by-pass paper feed unit.

4. Replacing the rubber (paper supply rubber) of the by-pass feed double feed prevention roller
a. Procedure (1) Remove the by-pass paper feed unit. (2) Remove the by-pass feed base. (3) Cut the three wiring bands so as to free the wiring. (4) Remove the E ring, then remove the by-pass feed liftup gear.
Wiring bands

By-pass no paper detecting PS CN47 By-pass feed roller

Wiring

E ring

By-pass feed top plate Set screw CN233 By-pass paper feed MC By-pass feed lift-up gear

3-L-4

PAPER FEED UNIT

(5) Remove the spring, then remove the E ring, and remove the actuator. (6) Pull out the pin. (7) Remove the four set screws, then remove the by-pass feed top plate.
Set screws (at opposite side as well)

Paper supply rubber E ring By-pass feed bottom plate

Double feed prevention roller Paint mark

Pin

E ring By-pass feed top plate Actuator

Guide plate

Spring

(13) Re-install the by-pass double feed prevention roller rubber. (Be careful of the direction of the paint mark on the rubber.)

(8) Remove the four set screws, then free the by-pass feed bottom plate. (9) Lift the by-pass feed bottom plate using the shaft side as a pivot.

5. Replacing the Rubber of the Upper Paper Feed Roller and the Feed Roller
a. Procedure (1) Remove the paper feed unit. (2) Remove the three set screws, then remove the upper cassette rail (front).

Shaft

Set screws

By-pass feed bottom plate

Set screws (at opposite side as well)

Cassette rail (front)

Set screw

(10) Remove the E ring. (11) Open the guide plate to the bottom, then remove the double feed prevention roller. (12) Remove the paper supply rubber from the double feed prevention roller.

3-L-5

PAPER FEED UNIT

(3) Remove the two E rings, then shift the left and right shaft bearings to the outside, and remove the upper stage 1st paper feed roller unit.

6. Replacing the Rubber of the Upper Stage Paper Feed Double Feed Prevention Roller (double feed prevention rubber)
a. Procedure (1) Remove the paper feed unit. (2) Remove the upper cassette rail (front). (3) Remove the two set screws, then remove the double feed prevention roller unit.

E ring

Shaft bearing

Feed roller

Double feed prevention roller unit

Shaft bearing Paper feed roller E ring

Set screws

(4) Pull out the three E rings, the three shaft bearings, the paper feed reference actuator and the two shafts of the paper feed roller unit, then remove each roller. (5) Remove the rubber from each roller (feed rubber A and the double feed prevention rubber).

(4) Remove the three E rings, then pull out the shaft and remove the double feed prevention roller. (5) Remove the double feed prevention rubber from the double feed prevention roller.

E rings Feed roller Shaft bearing (double feed Shaft bearing prevention rubber) E ring Shaft bearing Shaft bearing Paper feed reference actuator E ring Shaft bearing Shaft bearing E ring Paper feed roller (feed rubber A) Shaft Double feed prevention roller Double feed rubber

Paint mark Paint mark

(6) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on each rubber.)

(6) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on the rubber.)

3-L-6

PAPER FEED UNIT

7. Replacing the Rubber for the Lower Paper Feed Roller and the Feed Roller
a. Procedure (1) Remove the paper feed unit. (2) Remove the upper cassette rail (front). (3) Remove the three set screws, then remove the lower cassette rail (front).

(5) Pull out the three E rings, the three shaft bearings, the paper feed reference actuator and the two shafts of the paper feed roller unit, then remove each roller. (6) Remove the rubber from each roller (feed rubber A and the double feed prevention rubber).

Feed roller Shaft bearing (double feed Shaft bearing prevention rubber) E ring Shaft bearing Shaft bearing

Paint mark

Set screws

Set screw

Paper feed reference actuator E ring Shaft bearing Shaft bearing E ring Paper feed roller (feed rubber A)

Cassette rail (front)

(4) Remove the two E rings, then shift the left and right shaft bearings to the outside, and remove the lower stage 1st paper feed roller unit.

(7) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on each rubber.)

8. Replacing the Lower Stage Paper Feed Double Feed Prevention Roller (double feed prevention rubber)
a. Procedure (1) Remove the paper feed unit. (2) Remove the upper and lower cassette rails (front). (3) Remove the two set screws, then remove the double feed prevention roller unit.

E ring Shaft bearing

Double feed prevention roller unit

Paper feed roller Shaft E ring bearing

Set screws

3-L-7

PAPER FEED UNIT

(4) Remove the three E rings, then pull out the shaft and remove the double feed prevention roller. (5) Remove the double feed prevention rubber from the double feed prevention roller.

10.Removing and Re-installing the 2nd Paper Feed Unit
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Remove the drum unit, transfer/separation unit, and paper feed unit. (2) Remove the flywheel. (3) Disconnect the connector (CN86). (4) Remove the 1set screw, then remove the rotation C stopper of the 2nd paper feed clutch (MC3). Caution: DO NOT touch the drum drive gear with a screwdriver when removing the set screws.
C

E rings

Paint mark

Set screws Double feed prevention roller Double feed rubber Rotation stopper Drum drive gear

Shaft

(6) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on the rubber.)

9. Replacing the intermediate conveyance clutch
a. Procedure (1) Remove the paper feed unit. (2) Disconnect the connector (CN234). (3) Remove the E ring, then remove the intermediate conveyance clutch (MC8).
C

Connector (CN86)

Set screw (back)

2nd paper feed clutch (MC3)

(5) Slacken the set screw, then remove the 2nd paper feed clutch and the gear.(Clutch and gear are one-part.)

E ring

intermediate conveyance clutch (MC8)

Set screw

Gear

Connector (CN234)

2nd paper feed clutch (MC3)

(4) Re-install the intermediate conveyance clutch in the opposite sequence to removal. (Do not forget to insert the pin inside of clutch.)

3-L-8

PAPER FEED UNIT

(6) Remove the three intermediate connectors (CN42, 71 and 85).

11.Removing and Re-installing the Upper Tray
a. Procedure (1) Withdraw the upper tray, then remove the three set screws. (2) Withdraw the upper tray further, then lift it out.
Set screws

Connector (CN42) Connector (CN71) Connector (CN85)

C

(7) Remove the two set screws on the front and back, then pull out and remove the 2nd paper feed unit.

Upper tray

Set screw

(3) Re-install the upper tray in the opposite sequence to removal.

12.Removing and Re-installing the Lower Tray
a. Procedure (1) Withdraw the lower tray, then remove the three set screws. (2) Withdraw the lower tray further, then lift it out.
Set screws Set screw 2nd paper feed unit

C

(8) Re-install the 2nd paper feed unit in the opposite sequence to removal.

Lower tray

Set screw

(3) Re-install the upper tray in the opposite sequence to removal.

3-L-9

PAPER FEED UNIT

[4] Paper Feed Control

DSPS1

24VDC 88-3 PGND 88-7

99-3 99-7

24VDC 91-1 M13 DRIVE 91-2 M13 FG 91-3

M13

52-1

7-B11 11-B8

SGND PS11

M13 CONT 30-A1 M13 H/L 30-A2 M13 CLK 30-A3

PS11

52-2 52-3

11-A11 5VDC

DCDB
13-1

PS18

13-2 13-3

7-B5

PS18

5VDC 7-A11 SGND 7-B11

46-1

6-A1 6-A2 6-A3

SGND PS14 5VDC

SD1 DRIVE 24VDC SD2 DRIVE

7-A6 7-A5 7-A7

PS14

46-2 46-3

SD1 SD2 SD3 MC5 MC6 MC7 MC8

32-1

6-A4 6-A5 6-A6

SGND PS30 5VDC MC5 DRIVE 7-A9 SD3 DRIVE 7-A8

PS30

32-2 32-3

MC6 DRIVE 7-A10

MC7 DRIVE 7-A12

MC8 DRIVE 7-B12

CB

The 1st paper feed takes place as a result of the transmission of drive force from M13 (paper feed) via MC5 (1st paper feed (upper)), MC6 (1st paper feed (lower)) and MC7 (by-pass paper feed) to the respective paper feed rollers. At this time, the paper feed rollers are not touching the paper, hence the swivel roller and the by-pass plate are moved up and down by SD1 (1st paper feed (upper), SD2 (1st paper feed (lower)) and SD3 (by-pass paper feed), causing each roller to touch the paper. Control of each roller is done by the CB (control board). The 2nd paper feed is done by MC3. Related signals are PS11 (conveyance door), PS14 (registration), PS18 (no feed), PS19 (optics sync), PS20 (pre-feed (upper)), PS21 (pre-feed (lower)) and PS30 (by-pass).

1. Operation
a. 1st paper feed operation timing (1) 1st copy start Timing that is determined by the P counter from when the charging corona unit goes ON (2) 2nd copy start After the specified period from when PS14 (registration) goes ON for the 1st copy (3) OFF timing Specified count on the P counter b. Intermediate conveyance control The paper fed from the upper and lower trays is conveyed by the rotational power of M13 to the 2nd paper feed section by MC8 (conveyance). This conveyance section is also used for feeding paper from the ADU and LCT. However, it not used for by-pass paper feed. (1) MC8 ON timing When PS20 or PS21 is ON (2) MC8 OFF timing After the specified period from when PS20 or PS21 goes OFF.

3 - L - 10

PAPER FEED UNIT

C

C

c. 2nd paper feed control The paper conveyed to the 2nd paper feed section stops after the specified period from when PS14 goes ON (loop formation). (1) MC3 ON timing 1) Direct exposure scan copying (When superfine mode is selected) (1st copy in either normal or fine mode with platem mode or RADF(1-1)mode.) After the specified period from when PS4 (paper feed restart) goes ON 2) Copying in the E-RDH mode (2nd and subsequent copies in either normal or fine mode with platen mode or RADF(1-1)) (All copies in RADF(1-2,2-1,2-2)mode) After the specified period from when PS18 goes ON, or after the specified period from when MC7 (by-pass paper feed) goes ON

During continuous paper feed from the LCT/ADU, the CB checks the state of PS18 (no feed) when the paper reaches the specified position past PS19, and if the previous sheet of paper is still at PS18, the CB temporarily stops paper feed. Paper feed restarts after the trailing edge of the previously fed paper has passed PS18 (no feed). (7) M13 FB (M13 DCDB) This is a feedback signal from the rotational speed sensor contained in M13. This signal is compared with the M13 CLK signal input from the CB, and the difference used to control the rotational speed of M13. b. Output signals (1) SD1 DRIVE (CB SD1) SD1 drive control signal [L]: SD1 ON [H]: SD1 OFF (2) SD2 DRIVE (CB SD2) SD2 drive control signal [L]: SD2 ON [H]: SD2 OFF (3) SD3 DRIVE (CB SD3) SD3 drive control signal [L]: SD3 ON [H]: SD3 OFF (4) MC5 DRIVE (CB MC5) MC5 drive control signal [L]: MC5 ON [H]: MC5 OFF (5) MC6 DRIVE (CB MC6) MC6 drive control signal [L]: MC6 ON [H]: MC6 OFF (6) MC7 DRIVE (CB MC7) MC7 drive control signal [L]: MC7 ON [H]: MC7 OFF (7) MC8 DRIVE (CB MC8) MC8 drive control signal [L]: MC8 ON [H]: MC8 OFF (8) M13 DRIVE (DCDB M3) Power supply line to M13 (9) M13 CONT (CB DCDB) M13 ON/OFF control signal [L]: M13 ON [H]: M13 OFF (10) M13 CLK (CB DCDB) M13 rotational speed control reference clock signal

2. Signals
a. Input signals (1) PS11 (PS11 CB) Conveyance door open/close detection signal [L]: Door is closed [H]: Door is open (2) PS18 (PS18 CB) When the tray, LCT or ADU is used, the image data from the E-RDH determines the laser write timing. Laser write starts after the specified period from when PS18 goes ON. Also, during LCT or ADU paper feed, when the paper turns PS19 (optics sync) ON, the CB checks the ON or OFF state of PS18, and if PS18 was turned ON by the previous sheet of paper, the CB stops the paper momentarily at the predetermined position after PS19 ON. After the paper has passed PS18, paper feed restarts. [L]: Paper is detected [H]: Paper is not detected (3) PS14 (PS14 CB) Paper detection signal used for detecting the paper feed temporary stop position PS14 goes ON and outputs [L] when paper is detected at the paper feed temporary stop position. (4) PS30 (PS30 CB) Jam detection sensor [L]: Paper is detected [H]: Paper is not detected (5) PS20/21 (PS21/21 CB) Sensor which determines the operation timing of MC8 (conveyance CL) (paper is conveyed as far the 2nd paper feed section) MC8 goes ON when PS20 or PS21 is ON. (6) PS19 (PS19 CB)

C

3 - L - 11

PAPER FEED UNIT

[5] Paper Up-down Control

M17 DRIVE 7-A1 24VDC 7-A2

M17 M18
58-1 58-2 58-3

M18 DRIVE 7-A3 24VDC 7-A4

SGND 7-B11 PS16 7-B3 5VDC 7-A11

b. Output signals (1) M17 DRIVE (CB M17) M17 drive control signal [L]: M17 ON [H]: M17 OFF (2) M18 DRIVE (CB M18) M18 drive control signal [L]: M18 ON [H]: M18 OFF
PS16

59-1 PS17 7-B4 59-2 59-3

PS17

327-1 PS20 7-B9 327-2 327-3

PS20

328-1 PS21 7-B10 328-2 328-3

PS21

CB

When a paper feed tray is loaded, M17 (upper tray) or M18 (lower tray) goes ON for a fixed period, raising the bottom plate in the tray. Related signals are PS16 (upper tray upper limit detection), PS17 (lower tray upper limit detection), PS20 (upper tray set detection) and PS21 (lower tray set detection).

1. Operation
a. ON timing M17 or M18 is turned ON by the paper size detecting sensor. b. ON timing M17 or M18 is turned OFF by PS16 or PS17 going ON.

2. Signals
a. Input signals (1) PS16 (PS16 CB) Upper tray upper limit detection signal The paper in the upper tray is raised by M17, and when it reaches the upper limit position this signal becomes [L]. (2) PS17 (PS17 CB) Lower tray upper limit detection signal The paper in the upper tray is raised by M18, and when it reaches the upper limit position this signal becomes [L].

3 - L - 12

PAPER FEED UNIT

[6] Paper Size Detection Control

2. Signals
a. Input signals (1) PAPER SIZE RETURN 0 to 3 (Paper size detection board CB) Paper size detection switch ON/OFF signal b. Output signals (1) TEMP 1 (CB Paper size detection board) Upper tray paper size detection timing pulses (2) TEMP 2 (CB Paper size detection board) Lower tray detection timing pulses

TMP 1 60-B1 TMP 2 60-B2 0 60-B3 PAPER SIZE RETURN 1 60-B4 2 60-B5 3 60-B6

CB

PAPER SIZE DETECTION BOARD

The size of the paper in the upper tray is detected as a result of the matrix circuit in the CB (control board) detecting the signal from the paper size detection board.

1. Operation
a. Tray (upper) paper size detection The paper size detection board has four switches which detect the position of the rear guide in the tray (upper). The paper size is detected according to the particular ON-OFF combination of these switches. The relation between the state of the switches on the paper size detection board and the paper size is shown below. Paper size A3 B4 A4 B5 B6 A4R B5R A OFF ON OFF OFF OFF ON OFF B OFF OFF ON ON OFF ON ON C OFF OFF OFF ON ON ON OFF D ON ON ON OFF OFF OFF OFF

b. Tray (lower) paper size setting The size of paper in the tray (lower) is set in the 25 mode. (Refer to the Adjustment section.)

3 - L - 13

PAPER FEED UNIT

[7] No Paper Detection Control

SGND 7-B11 PS12 7-B1 5VDC 7-A11

44-1 44-2 44-3

PS12

45-1 PS13 7-B2 45-2 45-3

PS13

47-1 PS15 7-B7 47-2 47-3

PS15

CB

No paper detection takes place by PS12 (upper tray no paper detection), PS13 (lower tray no paper detection) and PS15 (bypass no paper detection) which are controlled by the CB (control board).

1. Operation
a. No paper detection control When a paper feed tray or the by-pass feed tray becomes empty, PS12, PS13 or PS15 goes ON. As a result, the corresponding LED on OB1 (operation board 1) lights, and a message is displayed on the LCD (VFD1, VFD2) connected to OB2 (operation board 2).

2. Signals
a. Input signals (1) PS12 (PS12 CB) Upper tray no paper detection signal [L]: No paper in tray [H]: Paper in tray (2) PS13 (PS13 CB) Lower tray no paper detection signal [L]: No paper in tray [H]: Paper in tray (3) PS15 (PS15 CB) By-pass feed tray no paper detection signal [L]: No paper in tray [H]: Paper in tray

3 - L - 14

LCT-1000 TRAY PAPER FEED/CONVEYANCE SECTION

LCT-1000 TRAY PAPER FEED/CONVEYANCE SECTION
[1] Composition

Conveyance roller (upper)

LCT conveyance PS (PS144) Feed roller Paper feed swivel plate LCT paper feed SD (SD141)

LCT 1st paper feed CL (CL2) No paper detecting actuator Paper feed roller Upper limit detection actuator

[2] Mechanisms
Mechanism *1 Feed 1st paper feed Double feed prevention No paper detection Paper size detection Paper conveyance Conveyance drive Method Roller swiveling 1st paper feed roller; paper feed solenoid, paper feed clutch Torque limiter Photosensor None Roller conveyance Timing belt

*1: Roller swiveling
To prevent the 1st paper feed roller from touching the paper and causing a paper jam when the paper tray is being removed, the paper feed roller is designed so that it drops down and touches the paper only when paper feed is taking place. This operation takes place as a result of the LCT paper feed solenoid driving the paper feed swivel plate.

Feed roller LCT paper feed SD (SD141)

Paper feed roller

3-M-1

LCT-1000 TRAY PAPER FEED/CONVEYANCE SECTION

[3] Disassembly and Re-assembly
1. Removing and Re-installing the 1000 Tray Paper Feed/Conveyance Section
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Open the front door, then withdraw the LCT1000 tray/ LCT1500 tray in the forward direction. (2) Slacken the four set screws, then remove the right side upper cover. (3) Slacken the two set screws, then remove the right side lower cover. (4) Disconnect the two intermediate connectors (CN722, 728). (5) Remove the four set screws, then remove the LCT1000 paper feed/conveyance section.
LCT1000 tray paper feed/ conveyance section LCT1500 tray Shaft bearing

E ring

Shaft bearing

E ring Paper feed roller

CN722

(3) Pull out the three E rings, the three shaft bearings, the paper feed reference actuator and the two shafts of the paper feed roller unit, then remove each roller. (4) Remove the rubber from each roller (feed rubber A and the double feed prevention rubber).

CN728

Feed roller Shaft bearing (double feed Shaft bearing prevention rubber) E ring Paint mark Shaft bearing

Set screws LCT 1000 tray Shaft bearing Paper feed reference actuator E ring Shaft bearing

(6) Re-install the 1000 tray paper feed/conveyance section in the opposite sequence to removal.

2. Replacing the Rubber of the Paper Feed Roller and the Feed Roller
a. Procedure (1) Remove the LCT1000 paper feed/conveyance section. (2) Remove the two E rings, then shift the left and right shaft bearings to the outside, and remove the paper feed roller unit.
E ring

Shaft bearing

Paper feed roller (feed rubber A)

(5) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on each rubber.)

3-M-2

LCT-1000 TRAY PAPER FEED/CONVEYANCE SECTION

2. Replacing the Rubber of the Double Feed Prevention Roller
a. Procedure (1) Remove the four set screws, then remove the LCT1000 paper feed/conveyance section. (2) Slacken the two set screws, then remove the LCT conveyance door.

(4) Remove the three E rings, then pull out the shaft, and remove the double feed prevention roller. (5) Remove the double feed prevention rubber from the double feed prevention roller.
E rings

Paint mark

Set screw

Double feed prevention roller Double feed prevention rubber LCT conveyance door Set screw

Shaft

(3) Remove the two set screws, then remove the double feed prevention roller unit. (When re-installing the roller, push it downward and fix it.)

(6) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on the rubber, and also the direction in which you push down the double feed prevention roller unit.)

Double feed prevention roller unit

Push-down direction Set screws Set screws

3-M-3

LCT-1000 TRAY PAPER FEED/CONVEYANCE SECTION

[4] 1000 Tray Paper Feed/No Paper Detection Control
M140 CONT 120-A3 M140 PLL 120-A6 SD141 CONT 120-A8 120-A12 120-B3 CL2 CONT 120-B9 120-B11 120-B12 121-A3 121-A6 121-A8 121-A12 PS141 121-B3 121-B9 121-B11 PS210 121-B12 M140 BREAK SGND 703-A5 PS141 703-A6 5VDC 703-A7 723-1 723-2 723-3 PS144 24VDC 703-A3 SD141 DRIVE 703-A4 24VDC 703-A1 CL2 DRIVE 703-A2

2. Signals
a. Input signals (1) M140 brake state signal [H]: Brake ON [L]: Brake OFF (2) PS141 (PS141 DCDB CB) No paper detection signal from the 1000 tray [H]: No paper in tray [L]: Paper in tray (3) PS144 (PS144 DCDB CB) Paper passage detection signal from the 1000 tray conveyance section. This signal is [L] while paper is passing through the 1000 tray conveyance section. (4) PS210 (PS210 DCDB CB) 1st paper feed detection signal from the 1000 tray. This signal becomes [L] when paper is detected. b. Output signals (1) M140 CONT (CB DCDB M140) M140 ON/OFF control signal [H]: M140 OFF [L]: M140 ON (2) M140 PLL (CB DCDB M140) PLL control clock signal for M140 (3) CL1 CONT (CB DCDB) ON/OFF control signal for CL1 [H]: CL1 OFF [L]: CL1 ON (4) SD141 CONT (CB DCDB) ON/OFF control signal for SD141 [H]: SD141 OFF [L]: SD141 ON (5) CL1 DRIVE (DCDB CL1) ON/OFF drive signal for CL1 [H]: CL1 OFF [L]: CL1 ON (6) SD141 CONT (DCDB SD141) ON/OFF drive signal for SD141 [H]: SD141 OFF [L]: SD141 ON

CL2 SD141

PS141

SGND 703-B4 PS144 703-B5 5VDC 703-B6

727-1 727-2 727-3

PS144

SGND 703-B7 PS210 703-B8 5VDC 703-B9

726-1 726-2 726-3

PS210

40VDC PGND 5VDC M140 BREAK M140 CONT M140 PLL

705-1 705-2 706-1 706-2 706-3 706-4 706-5

M140

CB

SGND

DCDB

The 1st paper feed from the 1000 tray takes place as a result of the transmission of the rotational force of M140 (LCT paper feed) by means of CL1 (LCT 1st paper feed (1000)). The paper feed roller does not touch the paper at this time, so SD141 (LCT 1st paper feed (1000)) swivels, bringing the paper feed roller into contact with the paper. M140, CL1 and SD141 are driven by the DCDB (DC driver board) which is controlled by the CB (control board). Related signals are PS141 (LCT no paper detection (1000)), PS144 (LCT conveyance (1000)), and PS210 (LCT pre-feed (1000)).

1. Operation
a. 1st paper feed operation timing (1) Start of paper feed for 1st copy Timing determined by the P counter from when the charging corona unit goes ON (2) Start of paper feed for 2nd copy After the specified period from when PS14 (registration) goes ON during the 1st copy operation. (3) OFF timing Specified count on the P counter b. No paper detection control When the copy paper in the LCT1000 tray runs out, PS141 goes ON, the corresponding LED on OB1 (operation board 1) lights, and a message appears on the LCD (VFD1, VFD2) connected to OB2 (operation board 2).

3-M-4

LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION

LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION
[1] Composition

Paper feed roller Horizontal conveyance rollers

LCT paper feed SD (SD140)

No paper detection actuator Feed roller

Upper limit detection actuator LCT 1st paper feed CL (CL1)

[2] Mechanisms
Mechanism *1 Feed 1st paper feed Double feed prevention No paper detection Paper size detection Paper conveyance Conveyance drive Method Roller swivel 1st paper feed roller, paper feed solenoid Torque limiter Photo sensor None Roller conveyance Timing belt

*1: Roller swiveling
To prevent the 1st paper feed roller from touching the paper and causing a paper jam when the paper tray is being removed, the paper feed roller is designed so that it drops down and touches the paper only when paper feed is taking place. This operation is takes place as a result of the LCT paper feed solenoid driving the paper feed swivel plate.

Paper feed roller

Feed roller LCT paper feed SD (SD140) Paper feed swivel plate

3-N-1

LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION

[3] Disassembly and Re-assembly
1. Removing and Re-installing the 1500 Tray Paper Feed/Conveyance Section
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Withdraw the LCT1000 tray/LCT1500 tray in the forward direction. (2) Withdraw the LCT1500 tray paper feed/conveyance section in the forward direction, then withdraw it further and lift it out.
LCT1500 tray paper conveyance section

(3) Remove the two E rings, then shift the left and right shaft bearings to the outside, and remove the upper stage 1st paper feed roller unit.

Shaft bearing Feed roller

E ring

Shaft bearing Paper feed roller

E ring

(3) Re-install the 1500 tray paper feed/conveyance section in the opposite sequence to removal.

(4) Pull out the three E rings, the three shaft bearings, the paper feed reference actuator and the two shafts of the paper feed roller unit, then remove each roller. (5) Remove the rubber from each roller (feed rubber A and the double feed prevention rubber).

2. Replacing the Rubber of the Paper Feed Roller and Feed Roller
a. Procedure (1) Remove the LCT1500 paper feed/conveyance section. (2) Remove the two set screws, then remove the conveyance cover.
Set screw Conveyance cover

Feed roller Shaft bearing (double feed Shaft bearing prevention rubber) E ring Shaft bearing Shaft bearing

Paint mark

Paper feed reference actuator E ring Shaft bearing Shaft bearing E ring Paper feed roller (feed rubber A)

(6) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on each rubber.)
Set screw

3-N-2

LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION

3. Replacing the rubber of the double feed prevention roller
a. Procedure (1) Remove the LCT 1500 paper feed/conveyance section. (2) Remove the two set screws, then remove the double feed prevention roller. (When re-installing the roller unit, push it against the rear and fix it.)

[4] 1500 Tray Paper Feed/No Paper Detection Control
M140 CONT 120-A3 M140 PLL 120-A6 SD140 CONT 120-A7 120-A9 120-A11 CL1 CONT 120-B8 120-B10 120-B12 121-A3 121-A6 121-A7 121-A9 PS146 24VDC 701-A3 SD140 DRIVE 701-A4 24VDC 701-A1 CL1 DRIVE 701-A2

CL1 SD140
710-1 710-2 710-3

121-A11 PS140 121-B8 121-B10 PS200 121-B12 M140 BREAK

SGND 701-A5 PS140 701-A6 5VDC 701-B1

PS140

Set screws Pushing direction

713-1 PS146 701-B3 713-2 713-3

PS146

SGND 701-B4 PS200 701-B5 5VDC 701-B6

712-1 712-2 712-3

PS200

40VDC PGND 5VDC M140 BREAK M140 CONT M140 PLL

705-1 705-2 706-1 706-2 706-3 706-4 706-5

M140

Double feed prevention roller unit

CB

SGND

DCDB

(3) Remove the three E rings, then pull out the shaft and remove the double feed prevention roller. (4) Remove the double feed prevention rubber from the double feed prevention roller.
E rings

Paint mark

The 1st paper feed from the 1500 tray takes place as a result of the transmission of the rotational force of M140 (LCT paper feed) by means of CL2 (LCT 1st paper feed (1500)). The paper feed roller does not touch the paper at this time, so SD140 (LCT 1st paper feed (1500)) swivels, bringing the paper feed roller into contact with the paper. M140, CL2 and SD140 are driven by the DCDB (DC driver board) which is controlled by the CB (control board). Related signals are PS140 (LCT no paper detection (1500)), PS146 (LCT conveyance (1500)), and PS200 (LCT pre-feed (1500)).

1. Operation
a. 1st paper feed operation timing (1) Start of paper feed for 1st copy Timing determined by the P counter from when the charging corona unit goes ON (2) Start of paper feed for 2nd copy Specified period after PS14 (registration) goes ON during the 1st copy operation (3) OFF timing Specified count on the P counter

Double feed prevention roller

Double feed prevention rubber

Shaft

(5) Re-install the rubber in the opposite sequence to removal. (Be careful of the direction of the paint mark on the rubber, and also the direction in which you push the double feed prevention roller unit.)

3-N-3

LCT-1500 TRAY PAPER FEED/CONVEYANCE SECTION

b. No paper detection control When the copy paper in the LCT1500 tray runs out, PS140 goes ON, the corresponding LED on OB1 (operation board 1) lights, and a message appears on the LCD (VFD1, VFD2) connected to OB2 (operation board 2).

2. Signals
C

a. Input signals (1) M140 BRAKE (M140 DCDB CB) M140 brake state signal [H]: Brake ON [L]: Brake OFF (2) PS140 (PS140 DCDB CB) No paper detection signal from the 1500 tray [H]: No paper in tray [L]: Paper in tray (3) PS146 (PS146 DCDB CB) Paper passage detection signal from the 1500 tray conveyance section. This signal is [L] while paper is passing through the 1500 tray conveyance section. (4) PS200 (PS200 DCDB CB) 1st paper feed detection signal from the 1500 tray This signal becomes [L] when paper is detected. b. Output signals (1) M140 CONT (CB DCDB M140) M140 ON/OFF control signal [H]: M140 OFF [L]: M140 ON (2) M140 PLL (CB DCDB M140) PLL control clock signal for M140 (3) CL2 CONT (CB DCDB) ON/OFF control signal for CL2 [H]: CL2 OFF [L]: CL2 ON (4) SD140 CONT (CB DCDB) ON/OFF control signal for SD140 [H]: SD140 OFF [L]: SD140 ON

(5) CL2 DRIVE (DCDB CL2) ON/OFF drive signal for CL2 [H]: CL2 OFF [L]: CL2 ON (6) SD140 CONT (DCDB SD140) ON/OFF drive signal for SD140 [H]: SD140 OFF [L]: SD140 ON

3-N-4

LCT PAPER TRAY SECTION

LCT PAPER TRAY SECTION
[1] Composition

Rear stopper Tray

Side guide Wire B Wire A Auxiliary wire Tray Tray motor (M141, M142)

<1500 tray>

Front cover Rear stopper Remaining paper indicator window

Tray

Wire B Wire A

Coupling gear Drive pulley Auxiliary drive spring

Side guides Remaining paper indicator window Front cover

Drive pulley

<1000 tray>

[2] Mechanisms
Mechanism Paper lift-up *1 Paper lift-up Cassette loading *2 Remaining paper indication Method Tray 1 stage Wire drive Front loading Index sheet

*2: Remaining paper indication
The LCT can hold a large amount of paper, hence it has a remaining paper indicator window to enable the user to obtain a rough indication of the amount of paper remaining in the tray. The remaining paper detection lever moves along with the up-down motion of the tray, and the index sheet is caused to slide by a tension spring.

*1: Paper lift-up
The paper tray is suspended by four up-down drive wires (wires A and B -- two each). When paper is supplied to the tray, the tray drops under the weight of the paper, however the weight of the paper is balanced by the tension of the auxiliary drive spring. When the paper tray is loaded, the tray motor (M141, M142) rotates, and the wire is wound up on the drive reel, causing the tray to rise. When the paper tray is withdrawn from the pedestal, the coupling between the tray and the tray drive section is released, hence the tray falls to a position where the weight of the paper is balanced by the tension of the auxiliary drive spring.
Index sheet Remaining paper indication lever

Tray

Tension spring

3-O-1

LCT PAPER TRAY SECTION

[3] Disassembly and Re-assembly
1. Removing and Re-installing the 1000 Tray
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Withdraw the 1000 tray, then remove the four set screws. (2) Lift out the 1000 tray.
Set screws

2. Removing and Re-installing the 1500 tray
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Withdraw the 1500 tray, then remove the four set screws. (2) Lift out the 1500 tray.
Set screws

1000 tray

Set screws

1500 tray

Set screws

(3) Re-install the 1000 tray in the opposite sequence to removal. In this case, however, install the front left and right set screws first.

(3) Re-install the 1500 tray in the opposite sequence to removal. In this case, however, install the front left and right set screws first.

3-O-2

LCT PAPER TRAY SECTION

3. Replacing the Wires
Caution: The method of installing the tray up-down drive wires is the same for both the front and rear. For this reason, the description of the method of replacing the wires is based on the rear side only. Install the front wires in exactly the same way as the rear wires.

Caution: a. After replacing or re-installing the wires, move the tray up and down by hand, and confirm that it rises and falls smoothly. b. Take care that wires do not cross each other or ride up the sides of the pulleys. c. Adjust the tilt of the tray after installing the wires.

3

Remove the restraining covers.
Wire restraining cover

Wire B

Wire A

Wire B

Tray

Auxiliary drive spring Wire A

Auxiliary wire

2
Wire A Wire A

4

Remove the E ring, then withdraw the drive pulley.

Detach the auxiliary wire from the auxiliary drive spring.

Auxiliary wire

1

Remove the wire protection cover.

Drive pulley Set screws

E ring

Wire protection cover

3-O-3

LCT PAPER TRAY SECTION


343±0.4mm (1500 tray) 236±0.4mm (1000 tray) Wire A 543±0.4mm (1500 tray) 355±0.4mm (1000 tray) Wire B 214±0.5mm (1500 tray) 157±0.5mm (1000 tray) Auxiliary wire



3

Pass wires A and B through the grooves in the pulleys, then install the wire restraining covers.

Wire A

Wire B

2

Pass wire B through the groove in the pulley, then install the wire restraining cover.
Wire B

Wire restraining cover

Pass wires A and B at the front side over the wire adjustment pieces.

Wire B

Wire A

Wire restraining cover Wire adjustment piece Wire B Tray Wire A Wire B Auxiliary drive spring Wire A Auxiliary wire Auxiliary wire

1

Pass the wires through here.

7

Attach the wire to the auxiliary drive spring.

8 5
Push in the drive pulley, and fix it with the E ring. Drive pulley Wire A Wire B Auxiliary wire

Install the wire protection cover.

Set screws

6
E ring

Wind the auxiliary wire clockwise around the drive pulley. (1000 tray: 4 turns; 1500 tray: 5 turns)

Wire protection cover

3-O-4

LCT PAPER TRAY SECTION

[4] Tray up-down Control

2. Signals
a. Input signals (1) PS142 (PS142 DCDB CB) 1500 tray upper limit detection signal. This signal becomes [L] when the upper limit is detected. (2) TRAY (15) ADD (MS141 DCDB CB) "1500 tray loaded" detection signal. This signal is the TMP4 signal which is input via MS141 when the tray is detected. (3) PS143 (PS143 DCDB CB) 1000 tray upper limit detection signal. This signal becomes [L] when the upper limit is reached. (4) TRAY (10) ADD (MS142 DCDB CB) "1000 tray loaded" detection signal. This signal is the TM4 signal which is input via MS142 when the tray is detected. (5) PS160 (PS160 DCDB CB) LCT conveyance door open/close detection signal [H]: LCT conveyance door open [L]: LCT conveyance door closed b. Output signals (1) M141 CONT (CB DCDB) M141 ON/OFF control signal [H]: M141 OFF [L]: M141 ON (2) M142 CONT (CB DCDB) M403 ON/OFF control signal [H]: M142 OFF [L]: M142 ON (3) TMP4 (CB DCDB MS141, MS142) This is a pulse signal which detects the fact that the 1500 tray and the 1000 tray are loaded. (4) M141 DRIVE (DCDB M141) M141 ON/OFF drive signal [H]: M141 OFF [L]: M141 ON (5) M142 DRIVE (DCDB M142) M142 ON/OFF drive signal [H]: M142 OFF [L]: M142 ON

M141 CONT 120-A4 M142 CONT 120-A5 120-B1 120-B2 TMP4 120-B4 120-B7 120-B5 120-B6

121-A4 121-A5 121-B1 121-B2 121-B4 121-B7 121-B5 121-B6 TRAY (15) ADD TRAY (10) ADD PS142 PS141 PS160

SGND 703-A8 PS143 703-A9 5VDC 703-A10

724-1 724-2 724-3

PS143

SGND 703-B1 PS160 703-B2 5VDC 703-B3

725-1 725-2 725-3

PS160

24VDC M142 DRIVE

706-8 706-9

M142

TMP4 TRAY (10) ADD

706-12 706-13

MS142
725-1 725-2 725-3

SGND 701-A5 PS142 701-B2 5VDC 701-B1

PS142

24VDC M141 DRIVE

706-6 706-7

M141

TMP4 TRAY (15) ADD

706-10 706-11

MS141

CB

DCDB

The tray rises as a result of the transmission of the rotational force of M141 (tray (1500)) and M142 (tray (1000)) by means of the drive wires (four wires each). M141 and M142 are driven by the DCDB (DC driver board) which is controlled by the CB (control board). Related signals are MS141 (LCT interlock (1500)), MS142 (LCT interlock (1000)), PS142 (LCT upper limit detection (1500)), PS143 (LCT upper limit detection (1000)), and PS160 (LCT conveyance open/close detection).

1. Operation
When MS141 or MS142 detects a paper tray, M141 or M142 goes ON, causing the corresponding tray to rise. The tray rises until PS142 or PS143 detects the upper limit of the paper and goes ON, then M141 or M142 goes OFF, and the tray stops rising. The paper is fed until PS142 or PS143 goes OFF, then M414 or M142 goes ON once again, and the tray rises. The lowering operation of both the 1500 tray and 1000 tray takes place mechanically.

3-O-5

ADU PAPER EXIT/CONVEYANCE SECTION

ADU PAPER EXIT/CONVEYANCE SECTION
[1] Composition

Paper exit rollers Selector guide

ADU gate solenoid (SD152) ADU cooling fan (M152)

ADU conveyance open/close door

Conveyance rollers

Timing belt

[2] Mechanisms
Mechanism *1 Paper path selection Paper conveyance Method Selector guide Conveyance roller
Selector guide

*1: Selecting the paper path
The paper that is exited from the fixing unit of the main body is either exited from the machine or sent to the ADU paper exit/conveyance section depending upon the setting of the selector guide. The selector guide operates according to the ON/OFF state of the ADU gate solenoid (SD152).
ADU gate solenoid (SD152)

3-P-1

ADU PAPER EXIT/CONVEYANCE SECTION

[3] Disassembly and Re-assembly
1. Removing the ADU Paper Exit/Conveyance Section
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Remove the cover at top left of the main body. (2) Disconnect the two connectors (CN94, 530), then remove the six set screws, and remove the ADU paper exit/conveyance section.

[4] Selector Guide

150-B1 150-B2 SD154 CONT 150-B3

151-B1 PS157 151-B2 PS158 151-B3

24VDC 521-B5 SD152 DRIVE 521-B6

SD152
560-1

PS157 510-B7

560-2 560-3

PS157

SGND 510-A4 PS146 510-A8 5VDC 510-A2

561-1 561-2 561-3

PS158

CB

DCDB

A
Paper exit/ conveyance section

The selector guide is driven by SD152 (ADU gate). SD152 is driven by the DCDB (DC driver board) which is controlled by the CB (control board). Related signals are PS157 (ADU gate) and PS158 (ADU conveyance door open/close detection).

1. Operation
Set screws

CN94 CN530

View in A direction

a. Selector guide control When the face side copy is made, SD152 goes ON after the specified time from when MC3 (2nd paper feed) goes ON, causing the selector guide to open. As a result, the paper exited from the fixing unit is conveyed to the ADU paper exit/conveyance section. SD152 goes OFF after the specified time from when PS25 (paper exit) detects the trailing edge of the paper and goes ON, then the selector guide closes. b. Paper exit/conveyance control The paper exit roller and conveyance roller are driven by M1 (main), and the paper exited from the fixing unit is conveyed to the ADU paper exit/conveyance section.

2. Signals
a. Input signals (1) PS157 (PS157 DCDB CB) Signal which detects the passage of paper through the entrance of the stacker. This signal becomes [H] when paper is detected.

3-P-2

ADU PAPER EXIT/CONVEYANCE SECTION

(2) PS158 (PS158 DCDB CB) Signal which detects the open/closed state of the ADU conveyance door [H]: ADU conveyance door open [L]: ADU conveyance door closed b. ADU DB output signals (1) SD154 CONT (CB DCDB) SD154 ON/OFF control signal [H]: SD154 OFF [L]: SD154 ON (2) SD154 DRIVE (DCDB SD154) SD154 ON/OFF drive signal [H]: SD154 OFF [L]: SD154 ON

[5] M152 (ADU cooling fan) Control

150-B7 M152 CONT 150-B11

151-B7 151-B11

M152 LD

M152 DRIVE

96-B9

M152 LD 96-B10 PGND 96-A9

M152

CB

DCDB

M152 (ADU cooling fan) is installed in the paper exit/conveyance section in order to prevent curling of the paper. M152 is driven by the DCDB (DC driver board) which is controlled by the CB (control board).

1. Operation
a. ON timing After the specified time from when MC3 (2nd paper feed) goes ON b. OFF timing When M4 (drum) goes OFF

2. Signals
a. Input signals (1) M152 LD (M152 DC DB CB) [L] is output when M152 reaches the specified speed. b. Output signals (1) M152 CONT (CB DC DB) M152 ON/OFF control signal [L]: M152 ON [H]: M152 OFF (2) M152 DRIVE (DC DB M152) M152 ON/OFF drive signal [L]: M152 ON [H]: M152 OFF

3-P-3

ADU PAPER FEED/CONVEYANCE SECTION

ADU PAPER FEED/CONVEYANCE SECTION
[1] Composition

Conveyance guide plate (lower)

Reversal roller (at bottom)

Paper exit rollers ADU timing clutch (CL153) Paper exit rollers

Paper exit rollers Conveyance guide plate (upper)

ADU paper feed motor (M151) ADU paper feed clutch (CL151) Paper exit rollers ADU reversal clutch (CL152)

[2] Mechanisms
*1 *2 Mechanism Paper feed Paper path selection Paper conveyance Method Non-stack selection Selector gate Conveyance roller (one) Reversal roller (one) Paper exit rollers (four) Timing belts (four) + gear Selector gate, conveyance guide plate (B), opening/ closing of conveyance guide plate (upper)/(lower)

*1: Non-stack paper feed mechanism
The paper in the paper exit/conveyance section is fed to the paper feed unit by the conveyance rollers. When the trailing edge of the paper is completely inside the paper feed unit, it is exited to the conveyance unit by the reversal roller without being stacked. At this time, the paper is exited from the trailing edge side, hence the face side and reverse side are inverted in the conveyance unit.

*3

Conveyance drive Jam clearance

Conveyance roller

Face side Drum Reverse side

Reversal roller

3-Q-1

ADU PAPER FEED/CONVEYANCE SECTION

*2: Paper path selection
The selector gate switches the path of the paper exit/ conveyance between the paper advance path from the paper exit/conveyance section to the paper feed section, and the paper exit path from the paper feed section to the conveyance section. The selector gate does not have a drive mechanism. The paper path is determined by the shape of leading edge of the gate.

· Selector gate section

During paper feed

Selector gate Selector gate

· Paper feed unit section

Paper

During paper exit

Paper

Conveyance guide plate (B)

Selector gate

· Conveyance unit section

*3: Jam clearance mechanism
There is a jam clearance mechanism on each of the selector gate, the paper feed unit and the conveyance unit. Jammed paper can be removed by opening and closing the selector gate, conveyance guide plate (B) or conveyance guide plate (upper)/(lower), depending upon where the jam occurred.

Conveyance guide plate (upper)

Conveyance guide plate (lower)

3-Q-2

ADU PAPER FEED/CONVEYANCE SECTION

[3] Disassembly and Assembly
1. Removing and Re-installing the Paper Feed/ Conveyance Section
Caution: Be sure that the power cord has been unplugged from the power outlet. a. Procedure (1) Withdraw the ADU unit, then remove the four set screws. (2) Completely withdraw the ADU unit, then lift out the ADU unit.

[4] Paper Feed/Reversal Control
CL151 CONT 150-A3 CL152 CONT 150-A4 150-A6 150-A7 M151 CONT 150-B4 M151 CLOCK 150-B5 150-B6 150-B10 150-B1 151-A3 151-A4 151-A6 151-A7 151-B4 151-B5 151-B6 M151 LD PS152 PS153 5VDC 521-A1 SGND 521-A2 M151 DRIVE 521-A3 M151 CLOCK 521-A4 M151 LD 521-A6 PGND 521-A8 PGND 521-A9 24VDC 521-A10 24VDC 521-B10

M151

C

151-B10 PS151 151-B1 PS157

24VDC 521-B1 CL151 DRIVE 521-B2

CL151 CL152
550-1 550-2 550-3

CL152 DRIVE 521-B3

Set screws

SGND 510-A3 PS151 510-B1 5VDC 510-A1

PS151

555-1 PS152 510-B2 555-2 555-3

PS152

556-1 PS153 510-B3 556-2 556-3

PS153

SGND 510-A4 PS157 510-B7

560-1 560-2 560-3

PS157

CB

DCDB

5VDC 510-A2

ADU paper feed/ conveyance section Set screws

(2) Re-install the paper feed/conveyance section in the opposite sequence to removal. In this case, however, install the front left and right set screws first.

The paper feed and reversal operations take place as a result of the transmission of rotational force from M151 (ADU paper feed) to the conveyance roller and the reversal roller by means of CL151 (ADU paper feed) and CL152 (ADU reversal). M151, CL151 and CL152 are driven by the DCDB (DC drive board) which is controlled by the CB (control board). Related signals are PS151 (ADU no paper detection), PS152 (ADU paper feed),PS153 (ADU reversal detection) and PS157(ADU gate).

1. Operation
a. Paper feed control M151 goes ON in synchronism with M1 (main). When PS152 detects the leading edge of the paper conveyed from the ADU paper exit/conveyance section, CL151 goes ON, causing the rotational force of M151 to be transmitted to the conveyance roller. As a result, paper is fed to the stacker from the bottom of the selector gate. CL151 goes OFF after the specified time from when PS152 detects the trailing edge of the paper. For the second sheet of paper, CL151 goes ON again after the specified time from when CL152 is turned OFF by the passage of the 1st sheet. The same operation is repeated for the subsequent sheets as well. M151 goes OFF 80 ms after PS19 (optics sync) goes OFF when the series of control operations in the ADU is completed.

3-Q-3

ADU PAPER FEED/CONVEYANCE SECTION

b. Reversal control When CL151 goes OFF, CL152 goes ON after the specified time, and the rotational force of M151 is transmitted to the reversal roller. As a result, the paper in the ADU paper feed section is reversed and conveyed, then exited to the conveyance section. CL152 is turned OFF after the specified time from when PS153 goes OFF as a result of detecting the trailing edge of the paper.

2. Signals
a. Input signals (1) PS151 (PS151DCDBCB) "No paper in stacker" detection signal [H]: Paper in stacker [L]: No paper in stacker (2) PS152 (PS152 DCDBCB) "Paper at entrance of ADU paper feed/conveyance section" detection signal. This signal becomes [H] when paper is detected. (3) PS153 (PS153DCDBCB) "Paper at entrance of ADU paper feed section" detection signal. This signal becomes [H] when paper is detected. (4) PS157 (PS157DCDBCB) "Paper jam at border section (paper exit side) of main body and ADU" detection signal. [H]: Paper in stacker [L]: No paper in stacker (5) M151 LD (PS153DCDBCB) This signal becomes [L] when M151 reaches the specified speed. b. Output signals (1) M151 CONT (CBDCDB) M151 ON/OFF control signal [H]: M151 OFF [L]: M151 ON (2) M151 CLOCK (CBDCDBM151) PLL control clock signal for M151 (3) CL151 CONT (CBDCDB) ON/OFF control signal for CL151 [H]: CL151 OFF [L]: CL151 ON

(4) CL152 CONT (CBDCDB) ON/OFF control signal for CL152 [H]: CL152 OFF [L]: CL152 ON (5) M151 DRIVE (DCDBM151) ON/OFF drive signal for M151 [H]: M151 OFF [L]: M151 ON (6) CL151 DRIVE (DCDBCL151) ON/OFF drive signal for CL151 [H]: CL151 OFF [L]: CL151 ON (7) CL152 DRIVE (DCDBCL152) ON/OFF drive signal for CL152 [H]: CL152 OFF [L]: CL152 ON

3-Q-4

ADU PAPER FEED/CONVEYANCE SECTION

[5] Conveyance Control

CL153 CONT 150-A5 150-A8 150-A9 150-A10

151-A5 151-A8 151-A9 PS154 PS155

24VDC 521-B1 CL153 DRIVE 521-B4

CL153
557-1 557-2 557-3

151-A10 PS156

SGND 510-A3 PS154 510-B4 5VDC 510-A1

PS154

b. Output signals (1) CL153 CONT (CBDCDB) CL153 ON/OFF control signal [H]: CL153 ON [L]: CL153 ON (2) CL135 DRIVE (DCDBCL153) CL153 ON/OFF drive signal [H]: CL153 OFF [L]: CL153 ON

558-1 PS155 510-B5 558-2 558-3

PS155

559-1 PS156 510-B6 559-2 559-3

PS156

CB

DCDB

Conveyance takes place as a result of the transmission of rotational force from M151 (ADU paper feed) by means of the CL153 (ADU timing). M151 and CL153 are driven by the DCDB (DC driver board) which is controlled by the CB (control board). Related signals are PS154 (ADU paper exit 1), PS155 (ADU paper exit 2) and PS156 (ADU paper exit 3).

1. Operation
CL153 goes ON in synchronism with M1 (main), and conveys the reversed paper from the stacker to the main body paper feed unit. If the PS18 (no feed) is ON when PS19 (optical synchronizing) is turned ON, CL153 goes OFF for a moment until PS18 is turned OFF. When PS18 is turned OFF CL153 goes ON again and when PS14 (resistration) is turned OFF by final paper, CL153 goes OFF.

2. Signals
a. Input signals (1) PS154 (PS154DCDBCB) "Jammed paper at entrance of ADU conve