Epson L800, L801 Service Manual

SERVICE MANUAL

Color Inkjet Printer

L800/L801

Confidential

SEMF10-008

Notice:

All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.

The contents of this manual are subject to change without notice.

The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

Note :Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective owners. EPSON disclaims any and all rights in those marks.

Copyright 2011 SEIKO EPSON CORPORATION

I&I CS Quality Assurance Department

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Safety Precautions

All safety procedures described here shall be strictly adhered to by all parties servicing and maintaining this product.

DANGER

WARNING

Strictly observe the following cautions. Failure to comply could result in serious bodily injury or loss of life.

1.Always disconnect the product from the power source and peripheral devices when servicing the product or performing maintenance.

2.When performing works described in this manual, do not connect to a power source until instructed to do so. Connecting to a power source causes high voltage in the power supply unit and some electronic components even if the product power switch is off. If you need to perform the work with the power cable connected to a power source, use extreme caution to avoid electrical shock.

Strictly observe the following cautions. Failure to comply may lead to personal injury or loss of life.

1.Always wear protective goggles for disassembly and reassembly to protect your eyes from ink in working. If any ink gets in your eyes, wash your eyes with clean water and consult a doctor immediately.

2.When using compressed air products; such as air duster, for cleaning during repair and maintenance, the use of such products containing flammable gas is prohibited.

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PRECAUTIONS

Strictly observe the following cautions. Failure to comply may lead to personal injury or damage of the product.

1.Repairs on Epson product should be performed only by an Epson certified repair technician.

2.No work should be performed on this product by persons unfamiliar with basic safety knowledge required for electrician.

3.The power rating of this product is indicated on the serial number/rating plate. Never connect this product to the power source whose voltages is different from the rated voltage.

4.Replace malfunctioning components only with those components provided or approved by Epson; introduction of second-source ICs or other nonapproved components may damage the product and void any applicable Epson warranty.

5.In order to protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static wrist straps, when accessing internal components.

6.Do not tilt this product immediately after initial ink charge, especially after performing the ink charge several times. Doing so may cause ink to leak from the product because it may take some time for the waste ink pads to completely absorb ink wasted due to the ink charge.

7.Never touch the ink or wasted ink with bare hands. If ink comes into contact with your skin, wash it off with soap and water immediately. If you have a skin irritation, consult a doctor immediately.

8.When disassembling or assembling this product, make sure to wear gloves to avoid injuries from metal parts with sharp edges.

9.Use only recommended tools for disassembling, assembling or adjusting the printer.

10.Observe the specified torque when tightening screws.

11.Be extremely careful not to scratch or contaminate the following parts.

Nozzle plate of the printhead

CR Scale

PF Scale

Coated surface of the PF Roller

Gears

Rollers

Exterior parts

12.Never use oil or grease other than those specified in this manual. Use of different types of oil or grease may damage the component or give bad influence on the printer function.

13.Apply the specified amount of grease described in this manual.

14.Make the specified adjustments when you disassemble the printer.

15.When cleaning this product, follow the procedure described in this manual.

16.When transporting this product after filling the ink in the printhead, pack the printer without removing the ink cartridges in order to prevent the printhead from drying out.

17.Make sure to install antivirus software in the computers used for the service support activities.

18.Keep the virus pattern file of antivirus software up-to-date.

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About This Manual

This manual, consists of the following chapters, is intended for repair service personnel and includes information necessary for properly performing maintenance and servicing the product.

Manual Configuration

CHAPTER 1. DISASSEMBLY / REASSEMBLY

Describes the disassembly/reassembly procedures for main parts/units of the product, and provides the standard operation time for servicing the product.

CHAPTER 2. ADJUSTMENT

Describes the required adjustments for servicing the product.

CHAPTER 3. MAINTENANCE

Describes maintenance items and procedures for servicing the product.

CHAPTER 4. APPENDIX

Provides the following additional information for reference:

•Power-On Sequence

•Standard Operation Time for servicing the product

•Troubleshooting

Symbols Used in this Manual

Various symbols are used throughout this manual either to provide additional information on a specific topic or to warn of possible danger present during a procedure or an action. Pay attention to all symbols when they are used, and always read explanation thoroughly and follow the instructions.

WARNING	Indicates an operating or maintenance procedure, practice or
	condition that, if not strictly observed, could result in serious
	injury or loss of life.
CAUTION	Indicates an operating or maintenance procedure, practice, or
	condition that, if not strictly observed, could result in bodily
	injury, damage or malfunction of equipment.
CHECK	May indicate an operating or maintenance procedure, practice or
POINT	condition that is necessary to accomplish a task efficiently. It may
	also provide additional information that is related to a specific
	subject, or comment on the results achieved through a previous
	action.

For Chapter 1 “Disassembly/Reassembly”, symbols other than indicated above are used to show additional information for disassembly/reassembly. For the details on those symbols, see “ 1.2 Disassembly/Reassembly Procedures (p17)”.

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		Revision Status
Revision	Date of Issue	Description
A	April 6, 2011	First Release

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L800/L801

Revision A

CONTENTS

Chapter 1 Disassembly/Reassembly
1.1 Overview ............................................................................................................		10
1.1.1	Tools ........................................................................................................	10
1.1.2	Checks and Precautions before Disassembling .......................................	10
1.1.3	Protection for Transportation ..................................................................	14
1.1.4	Making a Special Tool for Holder Contact .............................................	15
1.1.5	Orientation Definition .............................................................................	16
1.1.6 How to Unlock the Carriage....................................................................		16
1.2 Disassembly/Reassembly Procedures ................................................................		17
1.2.1 Overview .................................................................................................		17
1.2.2	Disassembly Flowchart ...........................................................................	18
1.3 Removing Exterior Parts/Components ...............................................................		24
1.3.1	Printer Cover ...........................................................................................	24
1.3.2	Paper Support Assy .................................................................................	24
1.3.3	Stacker Assy / Stacker Cover ..................................................................	25
1.3.4 Housing Upper Assy................................................................................		25
1.4 Removing Control Boards..................................................................................		27
1.4.1 Main Board Unit......................................................................................		27
1.4.2 Panel Assy/ Cover Open Sensor..............................................................		30
1.4.3	P/S Assy...................................................................................................	34
1.5 Disassembling the Printer Mechanism ...............................................................		35
1.5.1 Removing the Printer Mechanism ...........................................................		35
1.5.2	Printhead..................................................................................................	37
1.5.3 CR Scale ..................................................................................................		40
1.5.4 APG Unit .................................................................................................		41
1.5.5 Waste Ink Tray ........................................................................................		42
1.5.6 Waste Ink Pad Lower / Waste Ink Pad Cap Lower .................................		43
1.5.7 Left & Right Guide Stackers / CDR Guide Sensor .................................		44
1.5.8	Ink System ...............................................................................................	45
1.5.9 EJ Frame Assy.........................................................................................		46
1.5.10 PF Encoder / PF Scale ...........................................................................		49
1.5.11 PF Motor................................................................................................		49
1.5.12 CR Motor...............................................................................................		50

1.5.13 CR Unit..................................................................................................		52
1.5.14 ASF Unit................................................................................................		54
1.5.15 Upper Paper Guide ................................................................................		56
1.5.16 APG Sensor Assy ..................................................................................		57
1.5.17 Front Paper Guide Assy ........................................................................		57
1.5.18 CDR Tray Sensor ..................................................................................		60
1.6 Disassembling the CISS section.........................................................................		61
1.6.1	Refilling Ink Label / Valve Position Label .............................................	61
1.6.2 Top Cover................................................................................................		61
1.6.3 Tube Valve Holder Front / Rear..............................................................		62
1.6.4 Valve Lever .............................................................................................		62
1.6.5	Bottom Cover / Left Cover / Right Cover / Cover Joint .........................	63
1.6.6 Ink Supply Tank Assy .............................................................................		64
1.6.7 Ink Supply Tank Tube Assy....................................................................		64
1.6.8	Joint .........................................................................................................	65
1.6.9 Cover Case ..............................................................................................		65
1.6.10 PF Scale Cover / PF Scale Sheet ...........................................................		66
1.6.11 Tube Guide Sheet / Tube Guide Sheet Sub...........................................		66
1.6.12 Ink Supply Tube Assy ...........................................................................		67
1.6.13 Adapter Cover .......................................................................................		68
1.6.14	Adapter ..................................................................................................	68
Chapter 2 Adjustment
2.1 Adjustment Items and Overview........................................................................		70
2.1.1	Servicing Adjustment Item List ..............................................................	70
2.1.2	Required Adjustments .............................................................................	74
2.2 Using the Adjustment Program ..........................................................................		77
2.2.1 Top Margin Adjustment ..........................................................................		77
2.2.2 Head Angular Adjustment.......................................................................		77
2.2.3 Bi-D Adjustment .....................................................................................		78
2.2.4	PW Adjustment/First Dot Position Adjustment ......................................	79
2.2.5 PF Adjustment.........................................................................................		80
2.2.6 PG Adjustment ........................................................................................		81
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2.3	Banding Reduction System (BRS) Adjustment / Paper Feed Amount Profile (PFP)
	Correction............................................................................................................			83
	2.3.1 Overview .................................................................................................			83
	2.3.2	Adjustment Procedure .............................................................................		85
Chapter 3			Maintenance
3.1	Overview		............................................................................................................	89
	3.1.1	Cleaning...................................................................................................		89
	3.1.2	Service Maintenance ...............................................................................		89
	3.1.3	Lubrication ..............................................................................................		90
Chapter 4			Appendix
4.1	Power-On Sequence ...........................................................................................			97
4.2	Standard Operation Time for servicing the product ...........................................			99
4.3	Troubleshooting................................................................................................			102
	4.3.1 Troubleshooting Workflow ...................................................................			102
	4.3.2	Fatal Error Code ....................................................................................		104

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C H A P T E R

1

DISASSEMBLY/REASSEMBLY

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Revision A

1.1 Overview

CHECK	Some pictures in this manual are for Epson Stylus Photo R280/
POINT	R285/R290; therefore, the shapes of the parts are different from
	those of L800/L801, but the differences does not affect the
	disassembly/reassembly procedures.

This chapter describes procedures for disassembling the main parts/units of L800/L801. Unless otherwise specified, disassembled parts/units can be reassembled by reversing the disassembly procedure. See the cautions or tips for disassembly/reassembly described in “ 1.2 Disassembly/Reassembly Procedures (p17)”.

Read the following before disassembling and reassembling.

“ Safety Precautions (p3)”

“ 1.1.2 Checks and Precautions before Disassembling (p10)”

When you have to remove units or parts that are not described in this chapter, see the exploded diagrams of SPI (Service Parts Information).

1.1.1 Tools

Use only specified tools to avoid damaging the printer.

Table 1-1. List of Tools

Tool	Part No.
Phillips Screwdriver (No.1)	1080530
Phillips Screwdriver (No.2)	---
Flathead Screwdriver	---
Precision Screwdriver #1 (flathead)	---
Tweezers	---
Long-nose pliers	---
Acetate tape	1003963
2 pins (thinner than Ø2 mm)	---
Strong tape	1032813

Note : All of the tools listed above are commercially available. EPSON provides the tools listed with EPSON tool code.

1.1.2 Checks and Precautions before Disassembling

1.1.2.1 Factors which Affect the Print Quality

HOW TO PLACE THE INK TANK ASSY WHEN DISASSEMBLING/

REASSEMBLING

The film under sealing film attached on the Ink Supply Tank Assy of this printer is ventilation film. The ink in the ink tanks is vented to atmosphere through this film to keep ink supply to the Printhead stable. If the film gets wet with ink, the ink in the tanks is not properly vented and printing may not be capable.

In order to prevent this from occurring, make sure to place the Ink Supply Tank Assy as shown below after removing it.

OK

Ink Supply Tank Assy

Ink Supply Tank Assy

Ventilation film

	NG			Do not place the Ink Supply Tank Assy with
			Ink Supply Tank Assy
				its film side down. Otherwise, ink in the Ink

Supply Tank Assy may reach and cover the ventilation film, and the printing failure may occur.

Figure 1-1. How to Place the Ink Tank Assy

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1.1.2.2 Factors which Affect the Safety of Service Personnel such as
	MEANS DO TO MINIMIZE THE INK SPILL
Ink Leakage during Operation

Ink may spill when removing the following parts from L800/L801.

This section describes the parts that may cause ink spill and the means to minimize the ink spill when removing the parts.

THE PARTS THAT MAY CAUSE INK SPILL WHEN REMOVING

Parts		When ink may spill	Location
Joint	Removing the Ink Supply Tank Tube Assy		A
	/ Ink Supply Tube Assy from the Joint
Ink Supply	Removing the tubes of the Ink Supply		A, B
Tank Assy		Tank Tube Assy from the Joint
	Removing the tubes of the Ink Supply
Ink Supply		Tank Tube Assy from the Ink Supply
Tank Tube Assy		Tank Assy
(w/Valve Assy)
Adapter	Removing the Ink Supply Tube Assy from		C
	the Adapter
Ink Supply	Removing the Ink Supply Tank Tube Assy		A, C
Tube Assy		/ Ink Supply Tube Assy from the Joint
	Removing the Ink Supply Tube Assy
		from the Adapter
Note : These parts are indicated with the		icon in disassembly/reassembly flowchart. (See
“ 1.2 Disassembly/Reassembly Procedures (p17)”.)

Ink Supply Tank Assy

Adapter

C

Joint

CAUTION Even observing the points described in this section, ink may spill in the following situations. Therefore, be careful not to

contaminate the inside of the printer or its surroundings by preparing the container to receive the leaked ink, or the like.

When removing the Ink Supply Tank Tube Assy (w/ Valve Assy), some ink will spill from both ends of the tube even the Valve Lever is closed.

When removing the Ink Supply Tube Assy, all the ink in the tube will spill.

Before disassembling, confirm that the printer is in the following condition.Choke Valve is closed

CAUTION Do not turn the Valve Lever too much when closing the Choke Valve, otherwise, the Valve Lever and/or Valve Assy

may get damaged.

Before disassembling:

Turn the Valve Lever and be sure to close the Choke Valve.

After reassembling is complete:

Open the Choke Valve to perform the print inspection.

Before returning the printer to the user after repairing:

Make sure to turn the Valve Lever up to the choke position to close the Choke Valve before packing the printer.

Open position	Choke position	Choke position
		(When checking with the
		Valve Lever removed.)
		Valve shaft

A

Ink Supply Tube Assy		Ink Supply Tank Tube Assy

Figure 1-2. Location

B	Valve Lever	Valve Lever	Choke Valve shaft is secured more tightly
			in Choke position than in Open position.

Figure 1-3. Opening/closing the Choke Valve

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Adapter is removed

Before disconnecting the joint parts of the ink path, make sure that the Adapter is removed from the Carriage.

Adapter

Carriage

Ink path

Ink valve

	Figure 1-4. Adapter
CHECK	The Adapter has an ink valve which cuts off the ink path
POINT	when removing the Adapter from the Carriage.

DISCHRGING INK FROM THE INK SUPPLY TANK

Discharging ink is recommended only when disconnecting the Ink Supply Tank Tube Assy from the Ink Supply Tank. Before performing the above disconnection, discharge ink from the Ink Supply Tank as follows.

Necessary tools

•Containers (x 6) for each discharged ink

•Injector (with a tip of φ3.2 mm)

•Tube (capable to be connected to the joint)

CHECK	The photos in the following procedure are for L200/L201, but
POINT	the procedure for L800/L801 is the same; the numbers of the
	tube and the location of the Ink Supply Tank Assy in the
	photos are different from those of L800/L801, though.

Prior to the following steps, connect the injector with the tube, and then discharge ink according to the procedure.

Discharging procedure

1.Remove the Housing Upper Assy. (p.25)

2.With the choke value closed (p.11), place the Ink Supply Tank Assy on a place where its bottom is higher than the top of the Printhead.

3.Prepare a container for ink to discharge, then disconnect the Ink Supply Tube from the joint and put its tip into the container for the ink.

4.Open the choke valve to discharge the ink in the Ink Supply Tank Assy to the container.

Ink Supply Tank Assy

Ink Supply Tube

Container for discharged ink

Joint

Figure 1-5. Discharging Ink (1)

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	5.	When the ink stops flowing from the tube, close the choke valve, and	CHECK
		then connect the Ink Supply Tube back to the joint.
			POINT
	6.	Disconnect the Ink Supply Tube of the same color connected to the

opposite side of the joint.

7.Connect the tube from the injector.

8.Open the choke valve again, and suck up the remaining ink in the Ink Supply Tank into the injector.

9.Disconnect the tube from the injector, and connect the Ink Supply Tube of the same color back to the joint.

Joint

Tube

Injector (tip of φ3.2 mm)

It is recommended that the ink in the Ink Supply Tank should be discharged completely before proceeding to disassembling/ reassembling.

After all the reassembling work is complete, the discharged ink of each color should be refilled back to the Ink Supply Tank before performing the adjustment. Confirm the colors indicated on the film of the Ink Supply Tank so as not to mistake them, and make sure to refill each ink back to the correct tank from the corresponding ink supply hole.

Ink Supply Tank Assy

Ink supply hole

Figure 1-6. Discharging Ink (2)

10.Repeat Step 3 to Step 10 for all ink tanks to discharge all ink in the Ink Supply Tank.

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1.1.3 Protection for Transportation

Before packing the printer for returning it to the user, secure it at the specified points with strong tape to avoid damaging the printer or ink leakage during transport, and make sure to check the points as follows.

Attaching the Air Release Hole Caps

To prevent the ventilation film from getting wet, attach the Air Release Hole Caps (part number: 1556135) to the air release holes of the Ink Supply Tank Assy.

				Ink Supply Tank Assy
Air Release Hole Cap		Air release hole

Air Release Hole Cap

Figure 1-7. Attaching the Air Release Hole Caps

Securing each parts

Secure the following parts with strong tape (width: 22 mm).

Securing the CR Unit

1.Confirm that the CR Unit is locked in the home position.

2.Attach the unfolded end of strong tape (fold the other end back 10 mm) on the bottom left of the Adapter Cover.

3.Pull the tape to the right side of the housing and attach it tightly.

CR Unit

Strong tape

Securing the Ink Tank

•Secure both sides of the Top Cover with strong tape (x2).

•Align the unfolded end of strong tape (x5) with the edge of the Housing Upper, and attach the tape along the shape of the Housing Upper/Ink Supply Tank Assy through the openings between the Air Release Hole Caps.

Air Release Hole Cap

Ink Supply

Tank Assy

Top Cover

Strong tape (80 mm x 22 mm)

Strong tape (60 mm x 22 mm)

Strong tape (60 mm x 22 mm)

Fold over the tape edge by 10 mm

Figure 1-9. Securing the Ink Supply Tank Assy

Figure 1-8. Securing the CR Unit

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Points to be checked before packing the printer

The Valve Lever is on the position	All the caps of the Ink Supply Tank
shown below (the Choke Valve is	Assy are securely closed.
closed). (See Figure 1-3.)

1.1.4 Making a Special Tool for Holder Contact

The Holder Contact (refer to p.38) can be easily removed by using a special tool. The method for making the tool is described below.

1.Prepare a handle part of a clip, or a similar metal wire piece.

Valve Lever

Handle part

Cap

The hooks (x2) of the Ink Supply	The opened ink bottle is not
Tank Assy are securely engaged	included in the box.
with the Housing Upper Assy.
Ink Supply
Tank Assy

Housing Upper Assy

Clip

Figure 1-10. Making Special Tool for Holder Contact (1)

2.Bend the metal wire as shown below.

25mm 7mm

50mm

Special Tool

Figure 1-11. Making Special Tool for Holder Contact (2)

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1.1.5 Orientation Definition

Orientation descriptions used in the disassembly/reassembly procedures are as follows.

[Rear Side]

[Left Side]

[Right (home) Side]

[Front Side]

Figure 1-12. Orientation Definition

1.1.6 How to Unlock the Carriage

Unlocking the carriage is required for disassembly of some parts or components. Carry out any of the following operations to unlock the carriage and move the carriage to other than its home position.

CAUTION Be extremely careful not to damage the EJ Roller gear. Extra care must be taken to avoid injury from sharp metal edges.

Power the printer and turn it off forcedly by disconnecting the power cable when the CR Unit is unlocked and moved away from the home position.

Turn the EJ Roller gear on the left side of the printer in the direction of the arrow until the carriage is unlocked.

[Left side]
PF Roller Gear	EJ Roller Gear
	Turn this gear

Carriage Lock

Carriage Lock

Locked

Unlocked

Figure 1-13. How to Unlock the Carriage

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1.2 Disassembly/Reassembly Procedures

1.2.1 Overview

This section describes procedures for disassembling the parts/units in a flowchart format. For some parts/units, detailed procedures or precautions are provided (accordingly indicated by icons and cell's color). Refer to the explanations in the example chart below and perform an appropriate disassembling and reassembling procedure. (See“ 1.3 Removing Exterior Parts/Components (p24)”.)

The example below shows how to see the charts on the following pages.

Table 1-2. Explanatory Note

	Item		Description	Reference
Parts/unit		White-letter	Parts/units supplied as an ASP	---
name		Black-letter	Parts/units not supplied as an ASP	---
			Indicates a practice or condition that could result	Indicates the reference
			in injury or loss of life if not strictly observed.	page in blue-letter
			Indicates a practice or condition that could result	Indicates the reference
			in damage to, or destruction of equipment if not
				page in blue-letter
			strictly observed.
			Indicates the parts that are inevitably broken in
			the disassembling procedure, and should be	---
			replaced with a new one for reassembly.
			Indicates the parts that may cause the ink spill	“ 1.1.2 Checks and
				Precautions before
			when they are removed.
				Disassembling (p10)”
			Indicates necessary check items in the	Indicates the reference
Icon			disassembling/reassembling procedure.	page in blue-letter
			Indicates supplementary explanation for	Indicates the reference
			disassembly is given.	page in blue-letter
			Indicates particular tasks to keep quality of the	Indicates the reference
			units are required.	page in blue-letter
			Indicates particular adjustment(s) is/are required.	Chapter 2 “ Adjustment
				(p69)”
			Indicates lubrication is required.	Chapter 3 “
				Maintenance (p88)”
			Indicates the number of screws securing the	---
			parts/units.
			Indicates the points secured with other than a	---
			screw such as a hook, rib, dowel or the like.

								Reference page (A)
Black letters indicate a							“ 1.5.8 Ink System (p45)”
part/unit not supplied as				Main Board Unit
an ASP.

	Shows the screw types			3
	and the specified torque	S7	S15	---
	in the “Screw type/torque
	list”.

White letters indicate a	Ink Supply Tank	Front Paper
part/unit supplied as an	Tube Assy	Guide Assy
ASP.	---		2
Indicates that the	---	S9 S15	1
disassembly procedure of	(p 20)
boxed parts is explained
all together and step by
step in the section shown
as reference page (A).
	Adapter
	---

1

(p 18)

Reference page

Figure 1-14. Example Chart

Disassembly/Reassembly

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1.2.2 Disassembly Flowchart

START

	Printer Cover	Paper Support	Stacker Assy	Stacker Cover	Cover Ink Tube	Foot
		Assy
	---	---	---	---	---	---
	2	2	2	2	1	---
	(p 24)	(p 24)			(p 35)	---
			“ 1.3.3 Stacker Assy / Stacker Cover (p25)”
	Paper Support
	Assy

Housing Upper
Assy
	4
S4	---
(p 25)	1	(p 18)

A (p 19)

B	(p 20)	Cover Open	CR Scale
		Sensor
		---	---
		2	2
		(p 30)	(p 40)

1 (p 18) “ 1.3.4 Housing Upper Assy (p25)”

	Housing Right	Decoration Belt
		Right
	---	---
	2	2

Housing Upper

---

---

Adapter Cover		Joint		APG Unit		Panel Assy
	1		---		2		2
S6	3		2	S15	---	S4 S14	1
(p 68)		(p 65)	(p 69)	(p 41)	(p 88)	(p 30)	Screw type/torque list

Adapter							Symbol	Screw type	Torque
	---		2	(p 19)	3	(p 19)	S1	C.B.P. 2.6X8	3.5-4.5kgf.cm
							S2	C.B.P. 2.6X8	3-5kgf.cm
	1						S3	C.B.P. 3X10	3-5kgf.cm
(p 68)							S4	C.B.P. 3X10	5-7kgf.cm
(p 69)							S5	C.B.P. 3X6	3-5kgf.cm
							S6	C.B.P. 3X8	5-7kgf.cm
Holder Contact		Cover FFC Inner	Cover FFC				S7	C.B.P.(P2) 3X8	5-7kgf.cm
							S8	C.B.S 3X6	5-7kgf.cm
	---	---	---				S9	C.B.S. (P2) 3X8	6-8kgf.cm
	2	1	1				S10	C.B.S. (P4) 3X6	7-9kgf.cm
---		---	---				S11	C.B.S. (P4) 3X6	9-11kgf.cm
							S12	C.B.S. 3X10	4-6kgf.cm
							S13	C.B.S. 3X6	4-6kgf.cm
Printhead							S14	C.B.S. 3X6	5-7kgf.cm
	3						S15	C.B.S. 3X6	7-9kgf.cm
								C.P. 3X4	3-5kgf.cm
	---						S16
S2							S17	C.P. 3X6	3-5kgf.cm
			“ 1.5.2 Printhead (p37)”
							S18	C.P. 3X6	4-6kgf.cm

Disassembly/Reassembly

Disassembling/Reassembling Flowchart

18

Confidential

L800/L801

Revision A

A

(p 18)

	Top Cover	Valve Position	Refilling Ink
		Label	Label
	---	---	---
	2	---	---
	(p 61)	(p 61)	(p 61)

Tube Valve		Bottom Cover		Valve Lever	Cap	Top Cover Label
Holder Rear
	3		8	---	---	---
S5	6	S5	---	2	---	---
(p 62)		(p 63)		(p 62)	---	(p 61)

				Tube Valve
	Bottom Cover
				Holder Front

					---	3 (p 18)	“ 1.4.2 Panel Assy/ Cover Open Sensor (p30)”

Valve Lever		Left Cover	Left Cover		---
		---	Valve Lever	(p 62)	Panel Cover
					Assy
Right Cover		7	Right Cover			2
	---	(p 63)			S3	---	Panel Cover	Decoration Belt
								Left

7	Cover Joint		---	---	---
(p 63)		---		---	---
		2	Panel Unit	---	---

		(p 63)		---
			“ 1.5.4 APG Unit (p41)”	---
	2	(p 18)		Open Sensor
			---
				Holder

					1	Screw type/torque list
Spur Gear 12.8	Spur Gear 28.8	Spur Gear 33.6	Combination	S3	4	Symbol	Screw type	Torque
			Gear 14.22

---	---	---		---	---			S1	C.B.P. 2.6X8	3.5-4.5kgf.cm
								S2	C.B.P. 2.6X8	3-5kgf.cm
---	---	---		---	Panel Shield			S3	C.B.P. 3X10	3-5kgf.cm
---		---	---		Plate			S4	C.B.P. 3X10	5-7kgf.cm
						2
								S5	C.B.P. 3X6	3-5kgf.cm
	Compression	Compression	Combination		S3	---		S6	C.B.P. 3X8	5-7kgf.cm
									C.B.P.(P2) 3X8	5-7kgf.cm
	Spring 2.25	Spring 0.97	Gear 12.8.27					S7
	---	---		---				S8	C.B.S 3X6	5-7kgf.cm
	---	---		---				S9	C.B.S. (P2) 3X8	6-8kgf.cm
					Panel Board		Housing Panel	S10	C.B.S. (P4) 3X6	7-9kgf.cm
							Assy
	---	---	---						C.B.S. (P4) 3X6	9-11kgf.cm
						---	---	S11
								S12	C.B.S. 3X10	4-6kgf.cm
APG Holder						1	---	S13	C.B.S. 3X6	4-6kgf.cm
					---		---	S14	C.B.S. 3X6	5-7kgf.cm
---								S15	C.B.S. 3X6	7-9kgf.cm
---								S16	C.P. 3X4	3-5kgf.cm
									C.P. 3X6	3-5kgf.cm
								S17
---								S18	C.P. 3X6	4-6kgf.cm

Disassembly/Reassembly

Disassembling/Reassembling Flowchart

19

Confidential

L800/L801						Revision A
B	(p 18)
			“ 1.4.1 Main Board Unit (p27)”		*: There are four Tube Holders installed in this printer. Depending on the target parts or units, the number of
Main Board Unit			Tube Holder*
					Tube Holders you should remove differs.
	3			1	When removing the Ink Supply Tank Assy:	The Tube Holder on the home position side (on the Cover Case)
S7 S15	---		S6	1	When removing the Printer Mechanism:	All Tube Holders
	Upper Shield		---
	Plate M/B
		7
		---	Ink Supply Tank		Adapter Cover	Adapter Cover
	S14 S18		Assy

			---	Adapter
			---		Tube Guide
				Joint	Sheet
Shield Plate M/B	Lower Shield	(p 64)	(p 69)	Ink Supply Tank	---
Sub	Plate M/B
				Tube Assy

	2		2	---	Ink Supply Tube			3
					Assy (W/Clamp)
S13	---	S13	---	---		---	(p 66)	Tube Guide
								Sheet Sub
			(p 64)	(p 69)		---	Tube Guide	---
					(p 67)	(p 69)		1

Main Board

Top Cover

---

(p 66)

4

1

Bottom Cover

---

S12

---

Valve Lever

Right Cover

Left Cover

Screw type/torque list

Symbol

Screw type

Torque

Cover Ink Tube

APG Sensor

PF Encoder

PF Scale

Cover Joint

S1

C.B.P. 2.6X8

3.5-4.5kgf.cm

Assy

Tube Valve

S2

C.B.P. 2.6X8

3-5kgf.cm

Panel Assy

---

1

---

Holder Rear

S3

C.B.P. 3X10

3-5kgf.cm

Tube Valve

2

---

---

S4

C.B.P. 3X10

5-7kgf.cm

Tube Holder

S1

Holder Front

C.B.P. 3X6

3-5kgf.cm

S5

---

Ink Supply Tank

S6

C.B.P. 3X8

5-7kgf.cm

Assy

“ 1.5.10 PF Encoder / PF Scale (p49)”

Ink Supply Tank

S7

C.B.P.(P2) 3X8

5-7kgf.cm

Adapter Cover

Photo Interrupter

---

S8

C.B.S 3X6

5-7kgf.cm

C.B.S. (P2) 3X8

6-8kgf.cm

Adapter

---

---

S9

S10

C.B.S. (P4) 3X6

7-9kgf.cm

Tube Guide

2

(p 64)

(p 69)

S11

C.B.S. (P4) 3X6

9-11kgf.cm

Sheet/Tube

Guide Sheet Sub

---

S12

C.B.S. 3X10

4-6kgf.cm

“ 1.5.16 APG Sensor Assy

S13

C.B.S. 3X6

4-6kgf.cm

S14

C.B.S. 3X6

5-7kgf.cm

(p57)”

C

(p 21)

C.B.S. 3X6

7-9kgf.cm

S15

S16

C.P. 3X4

3-5kgf.cm

S17

C.P. 3X6

3-5kgf.cm

S18

C.P. 3X6

4-6kgf.cm

Disassembly/Reassembly

Disassembling/Reassembling Flowchart

20

Confidential

L800/L801										Revision A
C	(p 20)		4	(p 21)
Cover Case			Extension Spring			“ 1.5.12 CR Motor (p50)”		Porous Pad
						PF Encoder/			D	(p 22)
						PF Scale		Paper Guide
	1			---				Front
	---			2					---
S6						PF Motor
									---
	(p 65)		---
							2
								(p 57)
Printer			Driven Pulley			S17	---
Mechanism			Assy			(p 49)	(p 69)
	5	4	(p 21)	---
	4			---		Driven Pulley
S6					Driven Pulley
						Shaft
(p 35)	(p 69)				---	---
					---	---
			CR Motor

	2
S16	---
	Driven Pulley
	Holder

---

Housing Lower

---

Assy

---

---

“ 1.5.7 Left & Right Guide

Waste Ink Pad

Waste Ink Pad

---

Stacker Assy

Stackers / CDR Guide Sensor

P/S Assy

Waste Ink Tray

Screw type/torque list

Lower

Cap Lower

(p44)”

---

---

1

2

Symbol

Screw type

Torque

Waste Ink Pad

Stacker Cover

---

---

---

1

C.B.P. 2.6X8

3.5-4.5kgf.cm

Lower

S4

S4

S1

Waste Ink Pad

(p 34)

(p 69)

(p 42)

(p 69)

S2

C.B.P. 2.6X8

3-5kgf.cm

Cap

C.B.P. 3X10

3-5kgf.cm

Guide Stacker

Guide Stacker

S3

“ 1.5.6 Waste Ink Pad Lower / Waste Ink Pad Cap Lower (p43)”

P/S Assy

Left

Right Assy

S4

C.B.P. 3X10

5-7kgf.cm

1

1

S5

C.B.P. 3X6

3-5kgf.cm

S6

---

S6

---

CDR Guide

S6

C.B.P. 3X8

5-7kgf.cm

Label CDR

C.B.P.(P2) 3X8

5-7kgf.cm

S7

Sensor

---

---

S8

C.B.S 3X6

5-7kgf.cm

C.B.S. (P2) 3X8

6-8kgf.cm

2

---

S9

S10

C.B.S. (P4) 3X6

7-9kgf.cm

Housing Lower

---

---

S11

C.B.S. (P4) 3X6

9-11kgf.cm

(W/Foot)

S12

C.B.S. 3X10

4-6kgf.cm

---

Guide Stacker

S13

C.B.S. 3X6

4-6kgf.cm

---

Right

S14

C.B.S. 3X6

5-7kgf.cm

---

---

S15

C.B.S. 3X6

7-9kgf.cm

C.P. 3X4

3-5kgf.cm

---

S16

---

S17

C.P. 3X6

3-5kgf.cm

S18

C.P. 3X6

4-6kgf.cm

Disassembly/Reassembly

Disassembling/Reassembling Flowchart

21

Confidential

L800/L801											Revision A
D	(p 21)
Ink System			“ 1.5.8 Ink System (p45)”	APG Unit	Tube Guide		“ 1.5.9 EJ Frame Assy (p46)”
								Tube Guide
	2			Extension Spring	Cable Holder			Cable Holder
	---
S15				Driven Pulley	Frame			Frame
	Extension Spring		Compression	Assy		2
	0.8		Spring 0.98	CR Scale
		---	---			2		PF Scale Sheet
					S15
		2	---	Adapter Cover	---		PF Encoder FFC		---
	---		---	Adapter			---		---
				Cover FFC	Front Frame		---	(p 66)
	CR Lock
						2	---
		---		Cover FFC Inner		---		PF Scale Cover
					S15
		---		Holder Contact					1
LD Roller	---			Printhead				S6	1
					EJ Frame Assy
Guide Assy								(p 66)
	“ 1.5.14 ASF Unit (p54)”
	1					---
S10	5					---
	5	(p 23)
							EJ Frame	EJ Frame
							Torsion Spring L	Torsion Spring R
							---	---
ASF Unit							---	---
	2
S10 S11	2							“ 1.5.13 CR Unit (p52)”	Screw type/torque list
	6	(p 23)		Cable Holder					Symbol	Screw type	Torque
				Frame
									S1	C.B.P. 2.6X8	3.5-4.5kgf.cm
Upper Paper									S2	C.B.P. 2.6X8	3-5kgf.cm
Guide				CR Unit					S3	C.B.P. 3X10	3-5kgf.cm
	---				---				S4	C.B.P. 3X10	5-7kgf.cm
	---				2				S5	C.B.P. 3X6	3-5kgf.cm
									S6	C.B.P. 3X8	5-7kgf.cm
(p 56)					CR Guide Shaft		Timing Belt	Head FFC
									S7	C.B.P.(P2) 3X8	5-7kgf.cm
(p 69)
						---	---	---	S8	C.B.S 3X6	5-7kgf.cm
						---	---	---	S9	C.B.S. (P2) 3X8	6-8kgf.cm
										C.B.S. (P4) 3X6	7-9kgf.cm
Tube Guide								---	S10
Cable Holder									S11	C.B.S. (P4) 3X6	9-11kgf.cm
Frame									S12	C.B.S. 3X10	4-6kgf.cm
Front Frame									S13	C.B.S. 3X6	4-6kgf.cm
									S14	C.B.S. 3X6	5-7kgf.cm
EJ Frame Assy									S15	C.B.S. 3X6	7-9kgf.cm
									S16	C.P. 3X4	3-5kgf.cm
E	(p 23)								S17	C.P. 3X6	3-5kgf.cm
									S18	C.P. 3X6	4-6kgf.cm

Disassembly/Reassembly

Disassembling/Reassembling Flowchart

22

Confidential

L800/L801

Revision A

E (p 22)

6

(p 22)

“ 1.5.14 ASF Unit (p54)”

EJ Ground

Retard Roller

Combination

Spur Gear 16

LD Roller

Spring

Holder Assy

Gear 168.32.8

Shaft Assy

---	---	---	---	---
3	2	1	---	2
“ 1.5.17 Front Paper Guide Assy (p57)”	---	---	---	LD Roller

Front Paper								5	(p 22)		---
										Change Lever	---
Guide Assy										Assy
	2	PE Lever/		Spur Gear 26.5	Porous Pad	Photo Interrupter				---	---
	1	PE Lever			Paper Guide	(PE Sensor)		Torsion Spring			Compression
										---
S9 S15		Torsion Spring			Front
			---		---		---	137.7			Spring 2.36
									---	---	---
					1		4
			2
									---		---
CDR Tray				---		---
		---
Sensor								---		ASF Assy	---
	---									---
	2							LD Roller Guide		---	Change Lever
(p 60)									---	---	---
									---		1
								---			---

	Screw type/torque list
		Symbol	Screw type	Torque
		S1	C.B.P. 2.6X8	3.5-4.5kgf.cm
		S2	C.B.P. 2.6X8	3-5kgf.cm
		S3	C.B.P. 3X10	3-5kgf.cm
		S4	C.B.P. 3X10	5-7kgf.cm
		S5	C.B.P. 3X6	3-5kgf.cm
		S6	C.B.P. 3X8	5-7kgf.cm
		S7	C.B.P.(P2) 3X8	5-7kgf.cm
		S8	C.B.S 3X6	5-7kgf.cm
		S9	C.B.S. (P2) 3X8	6-8kgf.cm
		S10	C.B.S. (P4) 3X6	7-9kgf.cm
		S11	C.B.S. (P4) 3X6	9-11kgf.cm
		S12	C.B.S. 3X10	4-6kgf.cm
		S13	C.B.S. 3X6	4-6kgf.cm
		S14	C.B.S. 3X6	5-7kgf.cm
		S15	C.B.S. 3X6	7-9kgf.cm
		S16	C.P. 3X4	3-5kgf.cm
		S17	C.P. 3X6	3-5kgf.cm
		S18	C.P. 3X6	4-6kgf.cm
Disassembly/Reassembly	Disassembling/Reassembling Flowchart			23

Confidential

L800/L801 Revision A

1.3 Removing Exterior Parts/Components	1.3.2 Paper Support Assy
	Removal procedure

1.3.1 Printer Cover

Removal procedure

1.Pull out the left shaft and right shaft of the Printer Cover, and remove the Printer Cover.

1.Open the Paper Support Assy.

2.Disengage the right shaft of the Paper Support Assy from the bushing of the ASF Unit by pushing the bushing outward. Then remove the Paper Support Assy, disengaging the left shaft preventing the Edge Guide projection from hitting against the other parts.

Printer Cover
Shaft (left)	Shaft (right)

Figure 1-15. Removing the Printer Cover

Paper Support Assy

Push

Bushing of the ASF

Edge Guide

Projection

:Shaft

Figure 1-16. Removing the Paper Support Assy

When reinstalling the Paper Support Assy, match the projection and hole of the Edge Guide, then attach the right shaft and the left shaft in that order. (Put the shafts at the front side in the bushing and then push them rearward.) After reinstalling, check that the Paper Support Assy moves smoothly.

		Paper Support Assy
Convex Portion
2		1
Mounting Direction	Hole	: Shaft
(from front side to rear side)

Figure 1-17. Reinstalling the Paper Support Assy

Disassembly/Reassembly

Printer Cover

24

Confidential

L800/L801

Revision A

1.3.3 Stacker Assy / Stacker Cover

Removal procedure

1.Open the Stacker Cover.

2.Remove the Stacker Assy.

3.Release the Stacker Cover from the two shafts and remove the Stacker Cover.

1.3.4 Housing Upper Assy

Removal procedure

1.Remove the four screws and remove the Upper Housing upward.

•Screw : C.B.P. M3x10 (tightening torque: 5-7 kgf.cm)

(The numbers shown in the figure indicate the order of tightening the screws.)

[Rear Side]

4

3

Shaft

Shaft

		Stacker Assy		Stacker Cover
Figure 1-18. Removing the Stacker Assy / Stacker Cover
	When installing the Stacker Assy, insert the guide pins of the
	Stacker Assy into the lower grooves of the Guide Stacker Assy.
	(The upper grooves are used when CDR is printed.)					1	2

Groove

Groove

Upper Housing

Guide Pin	Guide Pin

Groove	Groove
Figure 1-19. Installing the Stacker Assy
Figure 1-20. Removing the Upper Housing

Disassembly/Reassembly	Stacker Assy / Stacker Cover	25
		Confidential

L800/L801

Revision A

2.Slide the Front Housing in the direction of the arrow and remove the Front Housing from the Upper Housing.

Grooves

Front Housing

[Rear Side]

Ribs

Figure 1-21. Removing the Front Housing

When installing the Upper Housing, be careful of the following:

Do not pinch the cables.

Tighten the screws in the order given in Fig.1-20 (p.25).

Match the ribs of the Upper Housing shown in Fig.1-20 (p.25) with the grooves of the Housing Lower.

As shown in Fig.1-22, match the A part of the Front Housing with the screw box of the Housing Lower.

Front Housing

Screw box of Housing Lower

A part of Front Housing

Figure 1-22. Installing Upper Housing

Disassembly/Reassembly	Housing Upper Assy	26
		Confidential

L800/L801

Revision A

1.4 Removing Control Boards

1.4.1 Main Board Unit

Removal procedure

Main Board Unit removal

1.Disconnect all connectors on the Main Board Unit.

2.Peel off the double-sided tape that secures the Panel FFC to the Holder Frame and release the Panel FFC. (Fig.1-29 (p.30))

3.Peel off the four acetate tapes that secures the following cables on the back of the Main Board Unit.

•Power Supply Cable

•CR Motor Cable

•PF Motor Cable

•PE Motor Cable

•APG Sensor Cable

Main Board Unit

CN3

CN17

CN6

CN7

Main Board Unit

	CN13	CN14	CN4
			CN16

CN12

CN11

Acetate Tape

Acetate Tape

CN10	Figure 1-24. Removing the Main Board Unit (1)

CN8

CN5

Figure 1-23. Connector layout of the Main Board

Table 1-3. List of Connectors and their Destinations

CN No.@	Color	Destination	Number of pins
CN3	White	P/S Assy	3pin
CN4	White	CDR Guide Sensor / CDR Tray Sensor	4pin
CN5	FFC	Panel Board	8pin
CN6	White	PE Sensor	3pin
CN7	Black	APG Sensor	3pin
CN8	FFC	PF Encoder	5pin
CN10	FFC		13pin
CN11	FFC	Head FFC	13pin
CN12	FFC		9pin
CN13	Black	PF Motor	2pin
CN14	White	CR Motor	2pin
CN16	FFC	PW Sensor / CR Encoder Sensor	6pin
CN17	White	Cover Open Sensor	2pin

Disassembly/Reassembly

Main Board Unit

27

Confidential

L800/L801

Revision A

4.Remove the three screws and remove the Main Board Unit.

• Screw	(2 pcs.): C.B.P.(P2) M3x8 (tightening torque: 5-7 kgf.cm)
• Screw	(1 pc.): C.B.S. M3x6 (tightening torque: 7-9 kgf.cm)

(The numbers shown in the figure indicate the order of tightening the screws.)

[Upper Side]

2

Positioning Holes

and Guide Pins

[Left Side]

3

Rib

1

Main Board Unit

Figure 1-25. Removing the Main Board Unit (2)

ADJUSTMENT REQUIRED

Whenever the Main Board Unit is replaced, the required adjustment must be carried out.

• Refer to "2.1.2 Required Adjustments" (p.74)

When installing the Main Board Unit, be careful of the following:

Match the positioning holes with guide pins shown in Fig.1-25.

Insert the rib of the Main Board Unit into the positioning hole of the Cable Holder Frame as shown in Fig.1-25.

Tighten the screws in the order given in Fig.1-25.

After connecting the cables, secure them with acetate tape following the procedures below.

1.Route the Power Supply Cable closely along the Lower Shield Plate M/B, and secure the cable with acetate tapes at the positions A, B, and C (30 mm each) as shown in Fig.1-26.

2.Avoiding the sharp edge shown in Fig.1-26, secure the following cables with the acetate tape D (50 mm).

•Power Supply Cable

•CR Motor Cable

•PF Motor Cable

•PE Motor Cable

•APG Sensor Cable

Positions of Acetate tape A, B, C

A

B

Power Supply Cable

Main Board Unit

C

Lower Shield Plate

M/B

A

D

B

D

Edge of Lower

Shield Plate M/B

C

Sharp edge

Align the upper left end of acetate tape D with the edge of the Lower Shield Plate M/B.

Figure 1-26. Routing the Cables

Disassembly/Reassembly

Main Board Unit

28

Confidential

L800/L801

Revision A

Disassembling the Main Board Unit

1.Remove the Main Board Unit (p.27).

CAUTION Do not apply unnecessary force on the screw receiving parts of the Lower Shield Plate M/B, as they are easy to deform.

When assembling or disassembling the Upper Shield Plate M/B,

be careful of its sharp edges.

2.Remove the seven screws and remove the Upper Shield Plate M/B.

•Screw (6 pcs.): C.B.S. M3x6 (tightening torque: 5-7 kgf.cm)

•Screw (1 pc.): C.P. M3x6 (tightening torque: 4-6 kgf.cm)

(The numbers shown in the figure indicate the order of tightening the screws.)

5	Lower Shield Plate
	M/B

		Upper Shield Plate
		M/B
3		2
		Screw Receiving Part
	7	1
Screw Receiving Part		4
		6

Figure 1-27. Removing the Upper Shield Plate M/B

CAUTION Be careful of the sharp edges shown in the figure below when assembling or reassembling.

3.Remove the two screws and remove the Shield Plate M/B Sub.

•Screw (2 pcs.): C.B.S. M3x6 (tightening torque: 4-6 kgf.cm)

(The numbers shown in the figure indicate the order of tightening the screws.)

4.Remove the screw and remove the Main Board Unit.

•Screw C.B.S. M3x10 (tightening torque: 4-6 kgf.cm)

Upper Side: Main Board

Lower Side: Lower Shield Plate M/B

ShieldPlate

M/B Sub

[Rear Side]

1

2

				Positioning Hole and
		Sharp edge
				Guide Pin
			Figure 1-28. Removing the Main Board

When installing the Main Board, match the positioning hole with the guide pin shown in Fig.1-28.

Tighten the screws in the order given in Fig.1-27 (p.29), Fig.1-28.

Disassembly/Reassembly

Main Board Unit

29

Confidential

L800/L801

Revision A

1.4.2 Panel Assy/ Cover Open Sensor

Removal procedure

Panel Assy removal

1.Disconnect the Panel FFC from the connector (CN5) on the Main Board and peel the Panel FFC off the Cable Holder Frame.

2.Disconnect the CDR Sensor Cable and Cover Open Sensor Cable from the connectors (CN4, CN17) on the Main Board.

3.Release the CDR Sensor Cable and Cover Open Sensor Cable from the two hooks of the Cable Holder Frame.

4.Peel off the acetate tape A, B to separate the CDR Sensor Cable from the Cover Open Sensor Cable.

Hooks and Acetate Tape A, B

CN17	CN4
	Cover Open Sensor and
	CDR Sensor Cable

CN5	Main Board	Panel FFC	Cable Holder
			Frame
			Double sided Tape

Figure 1-29. Removing the Panel Assy (1)

CAUTION When removing the screw (2) shown in Fig.1-30, be careful not to damage the Cover Open Sensor Cable and CDR Sensor Cable.

5.Remove the two screws.

•Screw (3 pcs.): C.B.P. M3x6 (tightening torque: 5-7 kgf.cm)

•Screw (3 pcs.): C.B.P. M3x10 (tightening torque: 5-7 kgf.cm)

6.From the bottom of the Printer, insert a flathead screwdriver into the hole to disengage the tab, and remove the Panel Assy.

Panel Assy

2

1

[Front side]

Open Sensor Holder

Tab

Disengage

direction

Housing Lower

Figure 1-30. Removing the Panel Assy (2)

Disassembly/Reassembly

Panel Assy/ Cover Open Sensor

30

Confidential